网页版通讯录

1 需求分析（需求分析师）

功能分析：

1）添加联系人

2）修改联系人

3）删除联系人

4）查询所有联系人

功能流转

 

 

美工设计： 设计软件的静态原型

3.2 需求设计（系统分析师/架构师/资深开发人员）

1）设计实体（抽象实体）

联系人实体：

class Contact{

private String id;

private String name;

private String gender;

private int age;

private String phone;

private String email;

private String qq;

}

2）设计“数据库”，（xml代替"数据库"）

contact.xml

<contactList>

<contact id="1">

<name>张三</name>

<gender>男</gender>

<age>20</age>

<phone>13433334444</phone>

<email>zs@qq.com</email>

<qq>43222222<qq>

</contact>

</contactList>

   3）设计涉及的接口

DAO接口（数据访问对象）：实体对象的CRUD方法。

项目原则： 通常一个实体对象就会对应一个DAO接口和一个DAO实现类

interface ContactDao{

public void addContact(Contact contact);//添加联系人

public void updateContact(Contact contact);//修改联系人

public void deleteContact(String id);//删除联系人

public List<Contact> findAll();  //查询所有联系人

public Contact findById(String id);//根据编号查询联系人

}

4）设计项目的目录结构

项目名称： contactSys_web

目录结构：

|- contactSys_web

|-src

|-gz.itcast.contactSys_web.entity : 存放实体对象

|-gz.itcast.contactSys_web.dao : 存放dao的接口

|-gz.itcast.contactSys_web.dao.impl: 存放dao的实现类

|-gz.itcast.contactSys_web.servlet: 存放servlet的类

|-gz.itcast.contactSys_web.test: 存放单元测试类

|-gz.itcast.contactSys_web.util: 存放工具类

|-gz.itcast.contactSys_web.exception: 存放自定义异常类

|-WebRoot

|-html文件

|-images：目录。存放图片资源

|-css：目录。存放css资源

|-js：目录。存放js资源

 

 

3.3 编码实现（软件开发工程师/攻城狮）

开发顺序：

设计数据库-> 实体 -> DAO接口，DAO实现-> Servlet+html页面

3.4 功能测试（测试攻城狮）

3.5 性能测试（测试攻城狮）

3.6 部署上线（实施攻城狮）

3.7 维护阶段（实施攻城狮）

大体流程：

工具类：使用dom4j以及xpath技术对数据库(xml)的增删改查；

访问QueryAllContact展示数据库中的用户（xml文件作为数据库）；

增加用户：跳转到addContact.html提交表单到AddContacts，将表单传过来的数据封装到一个Contact对象，使用工具类中的addContact添加用户；然后再跳转到QueryAllContact；

修改用户：传递参数id跳转到AlterContactsDisplay展示界面，默认值为id用户的数据；修改后的表单提交到AlterContacts（其中id作为隐藏域提交）然后用工具类中的AlterContact修改用户，然后再跳转到QueryAllContact；

删除用户：id作为参数跳转到DropContacts，使用工具类中的dropContact删除用户；再跳转到QueryAllContact；

其中QueryAllContact界面使用工具类的queryContact来得到所有用户并展示在界面上；

contact类：

package com.base.contact;

public class Contact {
    private String id;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    private String name;
    private String sex;
    private int age;
    private String phone;
    public Contact() {
        super();
    }
    public Contact(String name, String sex, int age, String phone,
            String qq, String email) {
        super();
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.phone = phone;
        this.qq = qq;
        this.email = email;
    }
    private String qq;
    private String email;
    
    
    @Override
    public String toString() {
        return "Contact [id=" + id + ", name=" + name + ", sex=" + sex
                + ", age=" + age + ", phone=" + phone + ", qq=" + qq
                + ", email=" + email + "]";
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getQq() {
        return qq;
    }
    public void setQq(String qq) {
        this.qq = qq;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
}

工具接口：

package com.io.tool;

import java.util.List;

import com.base.contact.Contact;


public interface ContactUtil {
    public boolean addContact(Contact e) throws Exception;
    public boolean alterContact(Contact e) throws Exception;
    public boolean dropContact(String id) throws Exception;
    public Contact findById(String id) throws Exception;
    public List<Contact> queryContact() throws Exception;
}

接口实现类：

package com.base.contact.impl;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import com.base.contact.Contact;
import com.io.tool.ContactUtil;

public class ContactUtilImpl implements ContactUtil{

    private String path;
    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    @Override
    public boolean addContact(Contact e) throws Exception {
        // TODO Auto-generated method stub
        Document doc;
        try {
            doc = new SAXReader().read(path);
            Element list = (Element) doc.selectNodes("//contacts").get(0);
            Element newcontact = list.addElement("contact");
            String id = UUID.randomUUID().toString().replace("-", "");
            newcontact.addAttribute("id", id);
            newcontact.addElement("name").setText(e.getName());
            newcontact.addElement("sex").setText(e.getSex());
            newcontact.addElement("age").setText(e.getAge()+"");
            newcontact.addElement("phone").setText(e.getPhone());
            newcontact.addElement("qq").setText(e.getQq());
            newcontact.addElement("email").setText(e.getEmail());
            
            OutputFormat format = new OutputFormat().createPrettyPrint();
            format.setEncoding("utf-8");
            FileOutputStream out = new FileOutputStream(new File(path));
            XMLWriter writer = new XMLWriter(out, format);
            writer.write(doc);
            writer.close();
            out.close();
        } catch (DocumentException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        
        return false;
    }

    @Override
    public boolean alterContact(Contact e) throws Exception {
        // TODO Auto-generated method stub
        String id = e.getId();
        Document doc;
        try {
            doc = new SAXReader().read(path);
            Element contactElem = (Element) doc.selectSingleNode("//contact[@id='"+ id +"']");
            contactElem.element("name").setText(e.getName());
            contactElem.element("sex").setText(e.getSex());
            contactElem.element("age").setText(e.getAge()+"");
            contactElem.element("phone").setText(e.getPhone());
            contactElem.element("qq").setText(e.getQq());
            contactElem.element("email").setText(e.getEmail());
            
            OutputFormat format = new OutputFormat().createPrettyPrint();
            format.setEncoding("utf-8");
            FileOutputStream out = new FileOutputStream(new File(path));
            XMLWriter writer = new XMLWriter(out, format);
            writer.write(doc);
            writer.close();
            out.close();
        } catch (DocumentException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean dropContact(String id) throws Exception {
        // TODO Auto-generated method stub
        try {
            Document doc = new SAXReader().read(path);
            Element list = (Element)doc.selectNodes("//contacts").get(0);
            list.remove((Element) list.selectSingleNode("//contact[@id='"+id+"']"));
            FileOutputStream out = new FileOutputStream(new File(path));
            OutputFormat format = new OutputFormat().createPrettyPrint();
            format.setEncoding("utf-8");
            XMLWriter writer = new XMLWriter(out, format);
            writer.write(doc);
            writer.close();
            out.close();
            return true;
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public Contact findById(String id) throws Exception {
        // TODO Auto-generated method stub
        Document doc;
        doc = new SAXReader().read(path);
        Element contactElem = (Element) doc.selectSingleNode("//contact[@id='"+ id +"']");
        if(contactElem == null){
            return null;
        }
        Contact e = new Contact();
        e.setId(contactElem.attributeValue("id"));
        e.setAge(Integer.parseInt(contactElem.elementText("age")));
        e.setName(contactElem.elementText("name"));
        e.setEmail(contactElem.elementText("email"));
        e.setSex(contactElem.elementText("sex"));
        e.setPhone(contactElem.elementText("phone"));
        e.setQq(contactElem.elementText("qq"));
        return e;
    }

    @Override
    public List<Contact> queryContact() throws Exception {
        // TODO Auto-generated method stub
        List<Contact> contacts = new ArrayList<Contact>();
        Document doc;
        doc = new SAXReader().read(path);
        List<Element>list  = doc.selectNodes("//contact");
        for(Element p : list){
            Contact e = new Contact();
            e.setId(p.attributeValue("id"));
            e.setAge(Integer.parseInt(p.elementText("age")));
            e.setName(p.elementText("name"));
            e.setEmail(p.elementText("email"));
            e.setSex(p.elementText("sex"));
            e.setPhone(p.elementText("phone"));
            e.setQq(p.elementText("qq"));
            contacts.add(e);
        }
        return contacts;
    }

}

servlet:

AddContacts:

package com.servlet.alter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.jaxen.function.ConcatFunction;

import com.base.contact.Contact;
import com.base.contact.impl.ContactUtilImpl;

public class AddContacts extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
        Contact e = new Contact();
        e.setName(request.getParameter("name"));
        e.setSex(request.getParameter("sex"));
        e.setAge(Integer.parseInt(request.getParameter("age")));
        e.setPhone(request.getParameter("phone"));
        e.setQq(request.getParameter("qq"));
        e.setEmail(request.getParameter("email"));
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactUtilImpl utilImpl = new ContactUtilImpl();
        utilImpl.setPath(path);
        try {
            utilImpl.addContact(e);
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        response.sendRedirect(request.getContextPath() + "/QueryAllContact");
    }

}

AlterContactsDisplay:

package com.servlet.alter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.base.contact.Contact;
import com.base.contact.impl.ContactUtilImpl;

public class AlterContactsDisplay extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter writer = response.getWriter();
        String id = request.getParameter("id");
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactUtilImpl utilImpl = new ContactUtilImpl();
        utilImpl.setPath(path);
        String html = "";
        html += "<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>";
        html += "<html xmlns='http://www.w3.org/1999/xhtml'>";
        html += "<head>";
        html += "<meta http-equiv='Content-Type' content='text/html; charset=utf-8' />";
        html += "<title>修改联系人</title>";
        html += "</head>";
        html += "";
        html += "<body>";
        html += "<center><h3>修改联系人</h3></center>";
        html += "<form action='"+request.getContextPath()+"/AlterContacts' method='post'>";
        html += "<table align='center' border='1' width='300px'>";
        try {
            Contact e = utilImpl.findById(id);
            //添加id隐藏域；
            html += "<input type='hidden' name='id' value='"+e.getId()+"'/>";
            html += "    <tr>";
            html += "        <th>姓名</th>";
            html += "        <td><input type='text' name='name' value='"+e.getName()+"'/></td>";
            html += "    </tr>";
            html += "    <tr>";
            html += "        <th>性别</th>";
            html += "        <td>";
            if("男".equals(e.getSex())){
                html += "        <input type='radio' name='sex' value='男' checked='checked'/>男";
                html += "        <input type='radio' name='sex' value='女'/>女";
            }else if("女".equals(e.getSex())){
                html += "        <input type='radio' name='sex' value='男'/>男";
                html += "        <input type='radio' name='sex' value='女' checked='checked'/>女";
                
            }else{
                html += "        <input type='radio' name='sex' value='男' checked='checked'/>男";
                html += "        <input type='radio' name='sex' value='女'/>女";
            }
            html += "        </td>";
            html += "    </tr>";
            html += "    <tr>";
            html += "        <th>年龄</th>";
            html += "        <td><input type='text' name='age' value='"+e.getAge()+"'/></td>";
            html += "    </tr>";
            html += "    <tr>";
            html += "        <th>电话</th>";
            html += "        <td><input type='text' name='phone' value='"+e.getPhone()+"'/></td>";
            html += "    </tr>";
            html += "    <tr>";
            html += "        <th>邮箱</th>";
            html += "        <td><input type='text' name='email' value='"+e.getEmail()+"'/></td>";
            html += "    </tr>";
            html += "    <tr>";
            html += "        <th>QQ</th>";
            html += "        <td><input type='text' name='qq' value='"+e.getQq()+"'/></td>";
            html += "    </tr>";
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        html += "    <tr>";
        html += "        <td colspan='2' align='center'>";
        html += "        <input type='submit' value='保存'/>&nbsp;";
        html += "        <input type='reset' value='重置'/></td>";
        html += "    </tr>";
        html += "</table>";
        html += "</form>";
        html += "</body>";
        html += "</html>";
        writer.write(html);
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
        
    }

}

AlterContacts:

package com.servlet.alter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.jaxen.function.ConcatFunction;

import com.base.contact.Contact;
import com.base.contact.impl.ContactUtilImpl;

public class AddContacts extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
        Contact e = new Contact();
        e.setName(request.getParameter("name"));
        e.setSex(request.getParameter("sex"));
        e.setAge(Integer.parseInt(request.getParameter("age")));
        e.setPhone(request.getParameter("phone"));
        e.setQq(request.getParameter("qq"));
        e.setEmail(request.getParameter("email"));
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactUtilImpl utilImpl = new ContactUtilImpl();
        utilImpl.setPath(path);
        try {
            utilImpl.addContact(e);
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        response.sendRedirect(request.getContextPath() + "/QueryAllContact");
    }

}

DropContacts:

package com.servlet.alter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import com.base.contact.Contact;
import com.base.contact.impl.ContactUtilImpl;

public class DropContacts extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        String id = request.getParameter("id");
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactUtilImpl utilImpl = new ContactUtilImpl();
        utilImpl.setPath(path);
        try {
            utilImpl.dropContact(id);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        response.sendRedirect(request.getContextPath() + "/QueryAllContact");
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}

QueryAllContact:

package com.servlet.query;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.base.contact.Contact;
import com.base.contact.impl.ContactUtilImpl;


public class QueryAllContact extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactUtilImpl utilImpl = new ContactUtilImpl();
        utilImpl.setPath(path);
        
        PrintWriter writer = response.getWriter();
        String html = "";
        html+="<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>";
        html+="<html xmlns='http://www.w3.org/1999/xhtml'>";
        html+="<head>";
        html+="<meta http-equiv='Content-Type' content='text/html; charset=utf-8' />";
        html+="<title>查询所有联系人</title>";
        html+="<style type='text/css'>";
        html+="    table td{";
        html+="        /*文字居中*/";
        html+="        text-align:center;";
        html+="    }";
        html+="    ";
        html+="    /*合并表格的边框*/";
        html+="    table{";
        html+="        border-collapse:collapse;";
        html+="    }";
        html+="</style>";
        html+="</head>";
        html+="<body>";
        html+="<center><h3>查询所有联系人</h3></center>";
        html+="<table align='center' border='1' width='700px'>";
        html+="    <tr>";
        html+="        <th>编号</th>";
        html+="        <th>姓名</th>";
        html+="        <th>性别</th>";
        html+="        <th>年龄</th>";
        html+="        <th>电话</th>";
        html+="        <th>邮箱</th>";
        html+="        <th>QQ</th>";
        html+="        <th>操作</th>";
        html+="    </tr>";
        try {
            List<Contact> list = utilImpl.queryContact();
            for(Contact e : list){
                html+="    <tr>";
                html+="        <td>"+e.getId()+"</td>";
                html+="        <td>"+e.getName()+"</td>";
                html+="        <td>"+e.getSex()+"</td>";
                html+="        <td>"+e.getAge()+"</td>";
                html+="        <td>"+e.getPhone()+"</td>";
                html+="        <td>"+e.getEmail()+"</td>";
                html+="        <td>"+e.getQq()+"</td>";
                html+="        <td><a href='/Contacts/AlterContactsDisplay?id="+e.getId()+"'>修改</a>&nbsp;<a href='"+request.getContextPath()+"/DropContacts?id="+e.getId()+"'>删除</a></td>";
                html+="    </tr>";
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        html+="    <tr>";
        html+="        <td colspan='8' align='center'><a href='"+request.getContextPath()+"/addContact.html'>[添加联系人]</a></td>";
        html+="    </tr>";
        html+="</table>";
        html+="</body>";
        html+="</html>";
        writer.write(html);
    }
    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}

addContact.html:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>添加联系人</title>
</head>

<body>
<center><h3>添加联系人</h3></center>
<form action="/Contacts/AddContacts" method="post">
<table align="center" border="1" width="300px">
    <tr>
        <th>姓名</th>
        <td><input type="text" name="name"/></td>
    </tr>
    <tr>
        <th>性别</th>
        <td>
        <input type="radio" name="sex" value="男"/>男
        <input type="radio" name="sex" value="女"/>女
        </td>
    </tr>
    <tr>
        <th>年龄</th>
        <td><input type="text" name="age"/></td>
    </tr>
    <tr>
        <th>电话</th>
        <td><input type="text" name="phone"/></td>
    </tr>
    <tr>
        <th>邮箱</th>
        <td><input type="text" name="email"/></td>
    </tr>
    <tr>
        <th>QQ</th>
        <td><input type="text" name="qq"/></td>
    </tr>
    <tr>
        <td colspan="2" align="center">
        <input type="submit" value="保存"/>&nbsp;
        <input type="reset" value="重置"/></td>
    </tr>
</table>
</form>
</body>
</html>

 改装mvc版：

dao+service+servlet+jsp;

 contactUtil + ContactUtilImpl:

package com.contact.dao;

import java.util.List;

import com.base.others.Contact;


public interface ContactUtil {
    public void addContact(Contact e);
    public void alterContact(Contact e);
    public void dropContact(String id);
    public Contact findById(String id);
    public List<Contact> queryContact();
    public boolean checkName(String name);
}

package com.contact.dao;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import com.base.others.Contact;
import com.contact.dao.*;
import com.contact.util.XmlUtil;

public class ContactUtilImpl implements ContactUtil{

    private String path;
    

    public ContactUtilImpl() {
        path = "E:/Test/contacts.xml";
    }

    @Override
    public void addContact(Contact e){
        // TODO Auto-generated method stub
        Document doc;
            doc = XmlUtil.getDocument(path);;
            Element list = (Element) doc.selectNodes("//contacts").get(0);
            Element newcontact = list.addElement("contact");
            String id = UUID.randomUUID().toString().replace("-", "");
            newcontact.addAttribute("id", id);
            newcontact.addElement("name").setText(e.getName());
            newcontact.addElement("sex").setText(e.getSex());
            newcontact.addElement("age").setText(e.getAge()+"");
            newcontact.addElement("phone").setText(e.getPhone());
            newcontact.addElement("qq").setText(e.getQq());
            newcontact.addElement("email").setText(e.getEmail());
            
            XmlUtil.writeDocument(doc, path);
        
    }

    @Override
    public void alterContact(Contact e){
        // TODO Auto-generated method stub
        String id = e.getId();
        Document doc;
            doc = XmlUtil.getDocument(path);
            Element contactElem = (Element) doc.selectSingleNode("//contact[@id='"+ id +"']");
            contactElem.element("name").setText(e.getName());
            contactElem.element("sex").setText(e.getSex());
            contactElem.element("age").setText(e.getAge()+"");
            contactElem.element("phone").setText(e.getPhone());
            contactElem.element("qq").setText(e.getQq());
            contactElem.element("email").setText(e.getEmail());
            
            OutputFormat format = new OutputFormat().createPrettyPrint();
            format.setEncoding("utf-8");
            XmlUtil.writeDocument(doc, path);
    }

    @Override
    public void dropContact(String id){
        // TODO Auto-generated method stub
        
            Document doc = XmlUtil.getDocument(path);
            Element list = (Element)doc.selectNodes("//contacts").get(0);
            list.remove((Element) list.selectSingleNode("//contact[@id='"+id+"']"));
            XmlUtil.writeDocument(doc, path);
        
    }

    @Override
    public Contact findById(String id){
        // TODO Auto-generated method stub
        Document doc;
        doc = XmlUtil.getDocument(path);
        Element contactElem = (Element) doc.selectSingleNode("//contact[@id='"+ id +"']");
        if(contactElem == null){
            return null;
        }
        Contact e = new Contact();
        e.setId(contactElem.attributeValue("id"));
        e.setAge(Integer.parseInt(contactElem.elementText("age")));
        e.setName(contactElem.elementText("name"));
        e.setEmail(contactElem.elementText("email"));
        e.setSex(contactElem.elementText("sex"));
        e.setPhone(contactElem.elementText("phone"));
        e.setQq(contactElem.elementText("qq"));
        return e;
    }

    @Override
    public List<Contact> queryContact(){
        // TODO Auto-generated method stub
        List<Contact> contacts = new ArrayList<Contact>();
        Document doc;
        doc = XmlUtil.getDocument(path);
        List<Element>list  = doc.selectNodes("//contact");
        for(Element p : list){
            Contact e = new Contact();
            e.setId(p.attributeValue("id"));
            e.setAge(Integer.parseInt(p.elementText("age")));
            e.setName(p.elementText("name"));
            e.setEmail(p.elementText("email"));
            e.setSex(p.elementText("sex"));
            e.setPhone(p.elementText("phone"));
            e.setQq(p.elementText("qq"));
            contacts.add(e);
        }
        return contacts;
    }

    @Override
    public boolean checkName(String name){
        Document doc = XmlUtil.getDocument(path);
        if(doc.selectSingleNode("//name[text()='"+name+"']") == null)
            return false;
        else
            return true;
    }

}

contactService+contactServiceImpl:

package com.contact.service;
import java.util.List;

import com.base.others.Contact;
import com.contact.exception.RepeatName;


public interface ContactService {
    public void addContact(Contact e) throws RepeatName;
    public void alterContact(Contact e);
    public void dropContact(String id);
    public Contact findById(String id);
    public List<Contact> queryContact();
}

package com.contact.service;

import java.util.List;

import com.base.others.Contact;
import com.contact.dao.ContactUtilImpl;
import com.contact.exception.RepeatName;

public class ContactServiceImpl implements ContactService{

    ContactUtilImpl contactUtilImpl;
    
    public ContactServiceImpl() {
        contactUtilImpl = new ContactUtilImpl();
    }

    @Override
    public void addContact(Contact e) throws RepeatName {
        if(contactUtilImpl.checkName(e.getName())){
            
            throw new RepeatName("此用户已经被使用");
        }else{
            contactUtilImpl.addContact(e);
        }
        
    }

    @Override
    public void alterContact(Contact e){
        
        contactUtilImpl.alterContact(e);
    }

    @Override
    public void dropContact(String id) {
        // TODO Auto-generated method stub
        contactUtilImpl.dropContact(id);
    }

    @Override
    public Contact findById(String id) {
        // TODO Auto-generated method stub
        return contactUtilImpl.findById(id);
    }

    @Override
    public List<Contact> queryContact() {
        // TODO Auto-generated method stub
        return contactUtilImpl.queryContact();
    }
    
}

AddContacts+AlterContacts+DropContacts+Index:

package com.contact.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.jaxen.function.ConcatFunction;





import com.base.others.Contact;
import com.contact.dao.ContactUtilImpl;
import com.contact.exception.RepeatName;
import com.contact.service.ContactServiceImpl;

public class AddContacts extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
        Contact e = new Contact();
        e.setName(request.getParameter("name"));
        e.setSex(request.getParameter("sex"));
        e.setAge(Integer.parseInt(request.getParameter("age")));
        e.setPhone(request.getParameter("phone"));
        e.setQq(request.getParameter("qq"));
        e.setEmail(request.getParameter("email"));
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactServiceImpl utilImpl = new ContactServiceImpl();
        
        try {
            utilImpl.addContact(e);
        } catch (RepeatName e1) {
            request.setAttribute("msg", e1.getMessage());
            request.getRequestDispatcher("/contactList/add.jsp").forward(request, response);;
            return;
        }
        response.sendRedirect(request.getContextPath() + "/Index");
    }

}

package com.contact.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.jaxen.function.ConcatFunction;




import com.base.others.Contact;
import com.contact.exception.RepeatName;
import com.contact.service.ContactServiceImpl;

public class AlterContacts extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
        Contact e = new Contact();
        e.setId(request.getParameter("id"));
        e.setName(request.getParameter("name"));
        e.setSex(request.getParameter("sex"));
        e.setAge(Integer.parseInt(request.getParameter("age")));
        e.setPhone(request.getParameter("phone"));
        e.setQq(request.getParameter("qq"));
        e.setEmail(request.getParameter("email"));
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactServiceImpl utilImpl = new ContactServiceImpl();
        
        utilImpl.alterContact(e);
        
        response.sendRedirect(request.getContextPath() + "/Index");
    }

}

package com.contact.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import com.base.others.Contact;
import com.contact.service.ContactServiceImpl;

public class DropContacts extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        String id = request.getParameter("id");
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactServiceImpl utilImpl = new ContactServiceImpl();
        try {
            utilImpl.dropContact(id);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        response.sendRedirect(request.getContextPath() + "/Index");
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}

package com.contact.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;



import com.base.others.Contact;
import com.contact.service.ContactServiceImpl;


public class Index extends HttpServlet {

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        String path = this.getServletContext().getRealPath("/WEB-INF/classes/contacts.xml");
        ContactServiceImpl utilImpl = new ContactServiceImpl();
        
        try {
            List<Contact> list = utilImpl.queryContact();
            request.setAttribute("list", list);
            request.getRequestDispatcher("/contactList/query.jsp").forward(request, response);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
            
    }
    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}

读写类XmlUtil:

package com.contact.util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class XmlUtil {
    public static Document getDocument(String path){
        try {
            Document doc = new SAXReader().read(new File(path));
            return doc;
        } catch (DocumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            throw new RuntimeException();
        }
    }
    public static void writeDocument(Document doc, String path){
        FileOutputStream out;
        try {
            out = new FileOutputStream(new File(path));
            OutputFormat format = new OutputFormat().createPrettyPrint();
            format.setEncoding("utf-8");
            XMLWriter writer = new XMLWriter(out, format);
            writer.write(doc);
            writer.close();
            out.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            throw new RuntimeException();
        }
        
    }
}

自定义异常类：RePeatName:

package com.contact.exception;

public class RepeatName extends Exception{

    public RepeatName() {
        super();
        // TODO Auto-generated constructor stub
    }


    public RepeatName(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }
    
}

 扩展块——数据库：

MySqlUtil:

package com.contact.util;


import java.io.FileInputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;







import java.util.Properties;

import javax.management.RuntimeErrorException;

import com.mysql.jdbc.Driver;

public class MysqlUtil {
    private static String url = null;
    private static String user = null;
    private static String password = null;
    private static String driverClass = null;
    static{
        try {
            Properties properties = new Properties();
        //    FileInputStream fileInputStream = new FileInputStream("./src/db.properties");
            InputStream in = MysqlUtil.class.getResourceAsStream("/db.properties");
            
            properties.load(in);
            url = properties.getProperty("url");
            user = properties.getProperty("user");
            password = properties.getProperty("password");
            driverClass = properties.getProperty("driverClass");
            
            Class.forName(driverClass);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static Connection getConn() {
        // TODO Auto-generated method stub
        try {
            Connection conn = DriverManager.getConnection(url, user, password);
            return conn;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            throw new RuntimeException();
        }
    }
    public static void close(Connection conn, Statement state) {
        
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if(state != null){
            try {
                state.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    public static void close(Connection conn, Statement state, ResultSet resultSet) {
        if(resultSet != null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                throw new RuntimeException();
            }
        }
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if(state != null){
            try {
                state.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

contactUtilMysqlImpl:

package com.contact.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import org.dom4j.Document;

import com.base.others.Contact;
import com.contact.util.MysqlUtil;
import com.contact.util.XmlUtil;


public class ContactUtilMysqlImpl implements ContactUtil{

    @Override
    public void addContact(Contact e) {
        Connection conn = null;
        PreparedStatement state = null;
        try {
            conn = MysqlUtil.getConn();
            String sql = "INSERT INTO contactUser VALUES(?,?,?,?,?,?,?);";
            state = conn.prepareStatement(sql);
            String id = UUID.randomUUID().toString().replace("-", "");
            state.setString(1, id);
            state.setString(2, e.getName());
            state.setString(3, e.getSex());
            state.setInt(4, e.getAge());
            state.setString(5, e.getPhone());
            state.setString(6, e.getQq());
            state.setString(7, e.getEmail());
            int count = state.executeUpdate();
            System.out.println("已成功插入" + count + "条记录");
        } catch (Exception e2) {
            throw new RuntimeException(e2);
        }finally{
            MysqlUtil.close(conn, state);
        }
    }

    @Override

    public void alterContact(Contact e) {
        Connection conn = null;
        PreparedStatement state = null;
        try {
            conn = MysqlUtil.getConn();
            String sql = "UPDATE contactUser SET NAME=?,sex=?,age=?,phone=?,qq=?,email=? WHERE id=?;";
            state = conn.prepareStatement(sql);
            state.setString(1, e.getName());
            state.setString(2, e.getSex());
            state.setInt(3, e.getAge());
            state.setString(4, e.getPhone());
            state.setString(5, e.getQq());
            state.setString(6, e.getEmail());
            state.setString(7, e.getId());
            int count = state.executeUpdate();
            System.out.println("已成功修改" + count + "条记录");
        } catch (Exception e2) {
            throw new RuntimeException(e2);
        }finally{
            MysqlUtil.close(conn, state);
        }
    }

    @Override
    public void dropContact(String id) {
        Connection conn = null;
        PreparedStatement state = null;
        try {
            conn = MysqlUtil.getConn();
            String sql = "DELETE FROM contactUser WHERE id=?;";
            state = conn.prepareStatement(sql);
            state.setString(1, id);
            int count = state.executeUpdate();
            System.out.println("已成功删除" + count + "条记录");
        } catch (Exception e2) {
            throw new RuntimeException(e2);
        }finally{
            MysqlUtil.close(conn, state);
        }
        
    }

    @Override
    public Contact findById(String id) {
        Connection conn = null;
        PreparedStatement state = null;
        ResultSet resultSet = null;
        try {
            conn = MysqlUtil.getConn();
            String sql = "SELECT * FROM contactUser WHERE id=?;";
            state = conn.prepareStatement(sql);
            state.setString(1, id);
            resultSet = state.executeQuery();
            Contact e = null;
            while(resultSet.next()){
                e = new Contact();
                e.setId(resultSet.getString("id"));
                e.setName(resultSet.getString("name"));
                e.setSex(resultSet.getString("sex"));
                e.setAge(resultSet.getInt("age"));
                e.setPhone(resultSet.getString("phone"));
                e.setQq(resultSet.getString("qq"));
                e.setEmail(resultSet.getString("email"));
            }
            return e;
        } catch (Exception e2) {
            throw new RuntimeException(e2);
        }finally{
            MysqlUtil.close(conn, state, resultSet);
        }
        
    }

    @Override
    public List<Contact> queryContact() {
        Connection conn = null;
        PreparedStatement state = null;
        ResultSet resultSet = null;
        try {
            conn = MysqlUtil.getConn();
            String sql = "SELECT * FROM contactUser;";
            state = conn.prepareStatement(sql);
            resultSet = state.executeQuery();
            List<Contact> list = new ArrayList<Contact>();
            while(resultSet.next()){
                Contact e = new Contact();
                e.setId(resultSet.getString("id"));
                e.setName(resultSet.getString("name"));
                e.setSex(resultSet.getString("sex"));
                e.setAge(resultSet.getInt("age"));
                e.setPhone(resultSet.getString("phone"));
                e.setQq(resultSet.getString("qq"));
                e.setEmail(resultSet.getString("email"));
                list.add(e);
            }
            return list;
        } catch (Exception e2) {
            throw new RuntimeException(e2);
        }finally{
            MysqlUtil.close(conn, state, resultSet);
        }
    }

    @Override
    public boolean checkName(String name) {
        Connection conn = null;
        PreparedStatement state = null;
        ResultSet resultSet = null;
        try {
            conn = MysqlUtil.getConn();
            String sql = "SELECT * FROM contactUser WHERE name=?;";
            state = conn.prepareStatement(sql);
            state.setString(1, name);
            resultSet = state.executeQuery();
            if(resultSet.next())
                return true;
            else
                return false;
            
        } catch (Exception e2) {
            throw new RuntimeException(e2);
        }finally{
            MysqlUtil.close(conn, state, resultSet);
        }
    }
    
}