smbms笔记（部分）

SMBMS#

数据库

项目如何搭建？

考虑使用不使用Maven?依赖，jar

项目搭建准备工作#

搭建一个maven web项目
配置Tomcat
测试项目是否能够跑起来

导入项目中会遇到的jar包；

   <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp.jstl</groupId>
      <artifactId>jstl-api</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

创建项目包结构

编写实体类

ORM映射：表-类映射

package com.peng.pojo;

import java.math.BigDecimal;
import java.util.Date;

public class Bill {
    private Integer id; //id
    private String billCode; //账单编码
    private String productName; // 商品名称
    private String productDesc; // 商品描述
    private String productUnit; // 商品单位
    private BigDecimal productCount; // 商品数量
    private BigDecimal totalPrice; // 总金额
    private Integer isPayment; // 是否支付
    private Integer providerID; //供应商id
    private Integer createdBy; // 创建者
    private Date creationDate; // 创建时间
    private Integer modifyBy; // 更新者
    private Date modifyDate; //更新时间

    private String providerName; // 供应商名称

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getBillCode() {
        return billCode;
    }

    public void setBillCode(String billCode) {
        this.billCode = billCode;
    }

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }

    public String getProductDesc() {
        return productDesc;
    }

    public void setProductDesc(String productDesc) {
        this.productDesc = productDesc;
    }

    public String getProductUnit() {
        return productUnit;
    }

    public void setProductUnit(String productUnit) {
        this.productUnit = productUnit;
    }

    public BigDecimal getProductCount() {
        return productCount;
    }

    public void setProductCount(BigDecimal productCount) {
        this.productCount = productCount;
    }

    public BigDecimal getTotalPrice() {
        return totalPrice;
    }

    public void setTotalPrice(BigDecimal totalPrice) {
        this.totalPrice = totalPrice;
    }

    public Integer getIsPayment() {
        return isPayment;
    }

    public void setIsPayment(Integer isPayment) {
        this.isPayment = isPayment;
    }

    public Integer getProviderID() {
        return providerID;
    }

    public void setProviderID(Integer providerID) {
        this.providerID = providerID;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }

    public String getProviderName() {
        return providerName;
    }

    public void setProviderName(String providerName) {
        this.providerName = providerName;
    }
}

package com.peng.pojo;

import java.util.Date;

public class Provider {
    private Integer id; //id
    private String proCode; //供应商编码
    private String proName; // 供应商名称
    private String proDesc; // 供应商描述
    private String proContact; //供应商联系人
    private String proPhone; // 供应商电话
    private String proAddress; // 供应商地址
    private String proFax; // 供应商传真
    private Integer createdBy; // 创建者
    private Date creationDate; // 创建时间
    private Integer modifyBy; // 更新者
    private Date modifDate; //更新时间

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getProCode() {
        return proCode;
    }

    public void setProCode(String proCode) {
        this.proCode = proCode;
    }

    public String getProName() {
        return proName;
    }

    public void setProName(String proName) {
        this.proName = proName;
    }

    public String getProDesc() {
        return proDesc;
    }

    public void setProDesc(String proDesc) {
        this.proDesc = proDesc;
    }

    public String getProContact() {
        return proContact;
    }

    public void setProContact(String proContact) {
        this.proContact = proContact;
    }

    public String getProPhone() {
        return proPhone;
    }

    public void setProPhone(String proPhone) {
        this.proPhone = proPhone;
    }

    public String getProAddress() {
        return proAddress;
    }

    public void setProAddress(String proAddress) {
        this.proAddress = proAddress;
    }

    public String getProFax() {
        return proFax;
    }

    public void setProFax(String proFax) {
        this.proFax = proFax;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifDate() {
        return modifDate;
    }

    public void setModifDate(Date modifDate) {
        this.modifDate = modifDate;
    }
}

package com.peng.pojo;

import java.util.Date;

public class Role {
    private Integer id; //id
    private String roleCode; // 角色编码
    private String roleName; // 角色名称
    private Integer createdBy; // 创建者
    private Date creationDate; // 创建时间
    private Integer modifyBy;  // 更新者
    private Date modifyDate; //更新时间

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getRoleCode() {
        return roleCode;
    }

    public void setRoleCode(String roleCode) {
        this.roleCode = roleCode;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }
}

package com.peng.pojo;

import java.util.Date;

public class User {
    private Integer id; //id
    private String userCode; //用户编码
    private String userName; //用户名称
    private  String userPassword; // 用户密码
    private  Integer gender; //性别
    private Date birthday; // 出生日期
    private String phone; // 电话
    private String address; // 地址
    private Integer userRole; // 用户角色
    private Integer createdBy; // 创建者
    private Date creationDate; // 创建时间
    private Integer modifyBy; // 更新者
    private Date modifyDate; // 更新时间

    private Integer age; //年龄
    private String userRoleName; // 用户角色名称

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserCode() {
        return userCode;
    }

    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPassword() {
        return userPassword;
    }

    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public Integer getUserRole() {
        return userRole;
    }

    public void setUserRole(Integer userRole) {
        this.userRole = userRole;
    }

    public Integer getCreatedBy() {
        return createdBy;
    }

    public void setCreatedBy(Integer createdBy) {
        this.createdBy = createdBy;
    }

    public Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }

    public Integer getModifyBy() {
        return modifyBy;
    }

    public void setModifyBy(Integer modifyBy) {
        this.modifyBy = modifyBy;
    }

    public Date getModifyDate() {
        return modifyDate;
    }

    public void setModifyDate(Date modifyDate) {
        this.modifyDate = modifyDate;
    }

    public Integer getAge() {
        Date date = new Date();
        Integer age = date.getYear() - birthday.getYear();
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getUserRoleName() {
        return userRoleName;
    }

    public void setUserRoleName(String userRoleName) {
        this.userRoleName = userRoleName;
    }
}

编写基础公共类

数据库配置文件

driver = com.mysql.jdbc.Driver
url = jdbc:mysql://localhost:3306?useUnicode=true&characterEncoding=utf-8
username = root
password =

编写数据库的公共类

package com.peng.dao;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

//操作数据库的公共类
public class BaseDao {
    private static String driver;
    private static String url;
    private static String username;
    private static String password;

    //静态代码块，类加载的时候就初始化
    static {
        Properties properties = new Properties();
        //通过类加载器读取对应的资源
        InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
        try {
            properties.load(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
        driver = properties.getProperty("driver");
        url = properties.getProperty("url");
        username = properties.getProperty("username");
        password = properties.getProperty("password");
    }
    //获取数据库的连接
    public static Connection getConnection(){
        Connection connection = null;
        try {
            Class.forName(driver);
            connection = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return connection;
    }
    //编写查询公共类
    public static ResultSet execute(Connection connection,String sql,Object[] params,ResultSet resultSet,PreparedStatement preparedStatement) throws SQLException {
        //预编译的sql，在后面直接执行就可以了
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            //setObject,占位符从1开始，但是我们的数组是从0开始！
            preparedStatement.setObject(i+1,params[i]);
        }
        resultSet = preparedStatement.executeQuery();
        return resultSet;
    }

    //编写增删改公共方法
    public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {
        preparedStatement = connection.prepareStatement(sql);
        for (int i = 0; i < params.length; i++) {
            //setObject,占位符从1开始，但是我们的数组是从0开始！
            preparedStatement.setObject(i+1,params[i]);
        }
        int updateRows = preparedStatement.executeUpdate();
        return updateRows;
    }
    //释放资源
    public static boolean closeResoure(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet){
            boolean flag = true;
            if(resultSet!=null){
                try {
                    resultSet.close();
                    //GC回收
                    resultSet = null;
                } catch (SQLException e) {
                    e.printStackTrace();
                    flag = false;
                }
            }
            if (preparedStatement!=null){
                try {
                    preparedStatement.close();
                    //GC回收
                    preparedStatement=null;
                } catch (SQLException e) {
                    e.printStackTrace();
                    flag = false;
                }
            }
            if (connection!=null){
                try {
                    connection.close();
                    //GC回收
                    connection=null;
                } catch (SQLException e) {
                    e.printStackTrace();
                    flag=false;
                }

            }
            return flag;
    }
}

编写字符编码过滤器

<!--字符编码过滤器-->
<filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>com.peng.filter.CharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

package com.peng.filter;

import javax.servlet.*;
import java.io.IOException;

public class CharacterEncodingFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setCharacterEncoding("utf-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }
    @Override
    public void destroy() {
    }
}

8.导入静态资源

链接: https://pan.baidu.com/s/1Inbn3cusuxxtCQTLqWal9A 提取码: mktu 复制这段内容后打开百度网盘手机App，操作更方便哦

实现登录功能#

编写前端页面

设置首页

<!--设置欢迎页面-->
<welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
</welcome-file-list>

编写dao层登录用户登录的接口

   //得到要登录的用户
    public User getLoginUser(Connection connection, String userCode) throws SQLException;

编写dao接口的实现类

package com.peng.dao.user;

import com.peng.dao.BaseDao;
import com.peng.pojo.User;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDaoImpl implements UserDao{
    @Override
    public User getLoginUser(Connection connection, String userCode) throws SQLException {
        PreparedStatement pstm = null;
        ResultSet rs = null;
        User user = null;
        if (connection!=null) {
            String sql = "select * from smbms_user where userCode=?";
            Object[] params = {userCode};

            rs = BaseDao.execute(connection, pstm, rs, sql, params);
            if (rs.next()){
                user = new User();
                user.setId(rs.getInt("id"));
                user.setUserCode(rs.getString("userCode"));
                user.setUserName(rs.getString("userName"));
                user.setUserPassword(rs.getString("userPassword"));
                user.setGender(rs.getInt("gender"));
                user.setBirthday(rs.getDate("birthday"));
                user.setPhone(rs.getString("phone"));
                user.setAddress(rs.getString("address"));
                user.setUserRole(rs.getInt("userRole"));
                user.setCreatedBy(rs.getInt("createdBy"));
                user.setCreationDate(rs.getTimestamp("creationDate"));
                user.setModifyBy(rs.getInt("modifyby"));
                user.setModifyDate(rs.getTimestamp("modifyDate"));
            }
                BaseDao.closeResoure(null,pstm,rs);
        }
        return user;
    }
}

业务层接口

    //用户登录
    public User login(String userCode,String password);

业务层实现类

package com.peng.service.user;

import com.peng.dao.BaseDao;
import com.peng.dao.user.UserDao;
import com.peng.dao.user.UserDaoImpl;
import com.peng.pojo.User;
import org.junit.Test;

import java.sql.Connection;
import java.sql.SQLException;

public class UserServiceImpl implements UserService{
    //业务层都会调用dao层，所以我们要引用Dao层
    private UserDao userDao;
    public UserServiceImpl(){
        userDao = new UserDaoImpl();
    }
    @Override
    public User login(String userCode, String password) {
        Connection connection = null;
        User user = null;
        try {
            connection = BaseDao.getConnection();
            //通过业务层调用对应的具体的数据库操作
            user = userDao.getLoginUser(connection,userCode);
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResoure(connection,null,null);
        }
        return user;
    }

//    @Test
//    public void test(){
//        UserServiceImpl userService = new UserServiceImpl();
//        User admin = userService.login("admin","123456");
//        System.out.println(admin.getUserPassword());
//    }
}

编写servlet

package com.peng.servlet.user;

import com.peng.pojo.User;
import com.peng.service.user.UserServiceImpl;
import com.peng.util.Constsants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginServlet extends HttpServlet {

    //Servlet:控制层调用业务层代码

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        System.out.println("LoginServlet--start...");
        //获取用户名和密码
        String userCode = req.getParameter("userCode");
        String userPassword = req.getParameter("userPassword");

        //和数据库中的密码进行对比，调用业务层
        UserServiceImpl userService = new UserServiceImpl();
        User user = userService.login(userCode, userPassword);//这里已经把登录的人给查出来了
        if (user!=null){
            //查有此人，可以登录
            //将用户的信息放入Session中
            req.getSession().setAttribute(Constsants.USER_SISSION,user);
            //跳转到内部主页
            resp.sendRedirect("jsp/frame.jsp");
        }else {
            //查无此人，无法登录，转发回登录页面，顺带提示它，用户名或密码错误
            req.setAttribute("error","用户名或密码不正确");
            req.getRequestDispatcher("login.jsp").forward(req,resp);
        }


    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

注册Servlet

<!-- Servlet-->
<servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.peng.servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login.do</url-pattern>
</servlet-mapping>

测试访问，确保以上功能实现

登录功能优化#

注销功能：

思路：移除Session,返回登录界面

package com.peng.servlet.user;

import com.peng.util.Constsants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LogoutServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //移除用户的Constsants.USER_SISSION Session
        req.getSession().removeAttribute(Constsants.USER_SISSION);
        resp.sendRedirect(req.getContextPath()+"/login.jsp");//返回登录界面
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

注册xml

<servlet>
    <servlet-name>LogoutServlet</servlet-name>
    <servlet-class>com.peng.servlet.user.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LogoutServlet</servlet-name>
    <url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>

登录拦截优化

package com.peng.filter;

import com.peng.pojo.User;
import com.peng.util.Constsants;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SysFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //过滤器，从Session中获取用户
        User user = (User) request.getSession().getAttribute(Constsants.USER_SISSION);
      if (user==null){
          //已经被移除或者注销，或者未登录
          response.sendRedirect("/smbms/error.jsp");
      }else{
          filterChain.doFilter(servletRequest,servletResponse);
      }
    }

    @Override
    public void destroy() {

    }
}

注册xml

<!--用户登录过滤器-->
<filter>
    <filter-name>SysFilter</filter-name>
    <filter-class>com.peng.filter.SysFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>SysFilter</filter-name>
    <url-pattern>/jsp/*</url-pattern>
</filter-mapping>

测试，登录，注销，权限，全部欧克！

密码修改#

导入前端素材
些项目，建议从底层向上写

UserDao接口

//修改当前用户密码
public int updatePwd(Connection connection,int id,int password) throws SQLException;

UserDao接口实现类

//修改当前用户密码
@Override
public int updatePwd(Connection connection, int id, int password) throws SQLException {
    PreparedStatement preparedStatement = null;
    int execute = 0;
    if (connection!=null){
        String sql = "update smbms_user set userPassword = ? where id = ?";
        Object params[] = {password,id};execute = BaseDao.execute(connection, preparedStatement, sql, params);
        BaseDao.closeResoure(null,preparedStatement,null);
    }
    return execute;
}

userService

//根据用户id修改密码
public boolean updatePwd(int id,int pwd);

userService实现类

   @Override
    public boolean updatePwd(int id, int pwd) {
        Connection connection = null;
        boolean flag = false;
         //修改密码
        try {
            connection = BaseDao.getConnection();
            if (userDao.updatePwd(connection,id,pwd)>0){
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResoure(connection,null,null);
        }
        return flag;
    }

记得实现复用，需要提取出方法！

package com.peng.servlet.user;

import com.mysql.jdbc.StringUtils;
import com.peng.pojo.User;
import com.peng.service.user.UserService;
import com.peng.service.user.UserServiceImpl;
import com.peng.util.Constsants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//实现servlet复用
//修改密码
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if (method.equals("savepwd")&&method!=null){
            this.updatePwd(req,resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从session中拿id
        Object o = req.getSession().getAttribute(Constsants.USER_SISSION);
        String newpassword = req.getParameter("newpassword");
        System.out.println("newpassword"+newpassword);
        boolean flag = false;
        if (o!=null&&newpassword!=null){
            UserService userService = new UserServiceImpl();
            flag = userService.updatePwd(((User) o).getId(), newpassword);
            if (flag){
                req.setAttribute("message","修改密码成功，请退出使用新密码登录");
                //密码修改成功，移除当前Session
                req.getSession().removeAttribute(Constsants.USER_SISSION);
            }else {
                req.setAttribute("message","修改密码失败");

            }
        }else {
            req.setAttribute("message","新密码有问题");
        }
        try {
            req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

别忘了在web.xml注册

测试

优化密码修改使用Ajax;

阿里巴巴的fastjson

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.79</version>
</dependency>

后台代码修改

package com.peng.servlet.user;

import com.alibaba.fastjson.JSONArray;
import com.mysql.jdbc.StringUtils;
import com.peng.pojo.User;
import com.peng.service.user.UserService;
import com.peng.service.user.UserServiceImpl;
import com.peng.util.Constsants;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

//实现servlet复用
//修改密码
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if (method.equals("savepwd")&&method!=null){
            this.updatePwd(req,resp);
        }else if(method.equals("pwdmodify")&&method!=null){
            this.pwdmodify(req,resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
    //修改密码
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
        //从session中拿id
        Object o = req.getSession().getAttribute(Constsants.USER_SISSION);
        String newpassword = req.getParameter("newpassword");
        System.out.println("newpassword"+newpassword);
        boolean flag = false;
        if (o!=null&&newpassword!=null){
            UserService userService = new UserServiceImpl();
            flag = userService.updatePwd(((User) o).getId(), newpassword);
            if (flag){
                req.setAttribute("message","修改密码成功，请退出使用新密码登录");
                //密码修改成功，移除当前Session
                req.getSession().removeAttribute(Constsants.USER_SISSION);
            }else {
                req.setAttribute("message","修改密码失败");

            }
        }else {
            req.setAttribute("message","新密码有问题");
        }
        try {
            req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

//    验证旧密码 session中有用户的密码
    public void pwdmodify(HttpServletRequest req, HttpServletResponse resp){
        Object o = req.getSession().getAttribute(Constsants.USER_SISSION);
        String oldpassword = req.getParameter("oldpassword");

        //万能的Map:结果集
        Map<String, String> resultMap = new HashMap<String, String>();
        if (o==null){
            //Session失效了，session过期了
            resultMap.put("result","sessionerror");
        }else if(StringUtils.isNullOrEmpty(oldpassword)){//输入的密码为空
            resultMap.put("result","error");
        }else {
            String userPassword = ((User)o).getUserPassword();//Session中用户的密码
            if (oldpassword.equals(userPassword)){
                resultMap.put("result","true");
            }else {
                resultMap.put("result","false");
            }
        }
        try {
            resp.setContentType("application/json");
            PrintWriter writer = resp.getWriter();
            //JSONArray 阿里巴巴json的工具类,转换格式
            //json格式= {key:value}
            writer.write(JSONArray.toJSONString(resultMap));
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

测试

用户管理实现#

思路：

导入分页的工具类
用户列表页面导入

1、获取用户数量#

UserDao

//根据用户名或者角色查询用户总数
public int getUserCount(Connection connection,String username,int userRole) throws SQLException;

UserDaoimpl

    //查询用户总数
    @Override
    public int getUserCount(Connection connection, String username, int userRole) throws SQLException {
       PreparedStatement pstm = null;
       ResultSet rs = null;
        int count = 0;
       if (connection!=null){
           StringBuffer sql = new StringBuffer();
           sql.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole=r.id");
           ArrayList<Object> list = new ArrayList<Object>();//存放我们的参数

           if (!StringUtils.isNullOrEmpty(username)){
               sql.append(" and u.userName like ?");
               list.add("%"+username+"%"); // index:0
           }

           if (userRole>0){
               sql.append(" and u.userRole = ?");
               list.add(userRole); //index :1
           }
            //怎么把list转换为数组
           Object[] params = list.toArray();

           System.out.println("UserDaoImpl->getUserCount:"+sql.toString()); //输出最后完整的SQL语句
            rs = BaseDao.execute(connection, pstm, rs, sql.toString(), params);
           if (rs.next()){
               count = rs.getInt("count");//从结果集中获取最终的数量
           }
           BaseDao.closeResoure(null,pstm,rs);
       }
       return count;
    }

UserService

//查询记录数
public int getUserCount(String username,int userRole);

UserServiceImpl

//查询记录数
    @Override
    public int getUserCount(String username, int userRole) {
        Connection connection = null;
        int count=0;
        try {
            connection = BaseDao.getConnection();
            count = userDao.getUserCount(connection, username, userRole);
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResoure(connection,null,null);
        }
        return count;
    }
//    @Test
//    public void test(){
//        UserServiceImpl userService = new UserServiceImpl();
//        int userCount = userService.getUserCount(null,0);
//        System.out.println(userCount);
//    }

2、获取用户列表#

userDao

//通过条件查询-userList
public List<User> getUserList(Connection connection,String userName,int userRole,int currentPageNo,int pageSize) throws SQLException;

userDaoImpl

 @Override
    public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws SQLException {
        PreparedStatement pstm = null;
        ResultSet rs = null;
        List<User> userList = new ArrayList<User>();

        if (connection!=null){
            StringBuffer sql = new StringBuffer();
            sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r. id");
            List<Object> list = new ArrayList<Object>();
            if (!StringUtils.isNullOrEmpty(userName)){
                sql.append(" and u.userName like ?");
                list.add("%"+userName+"%");
            }
            if (userRole > 0){
                sql.append(" and u.userRole = ?");
                list.add(userRole);
            }
            //在数据库中分页使用 limit
            sql.append(" order by creationDate DESC limit ?,?");
            currentPageNo = (currentPageNo - 1)*pageSize;
            list.add(currentPageNo);
            list.add(pageSize);

            Object[] params = list.toArray();
            System.out.println("sql-->"+sql.toString());
            rs=BaseDao.execute(connection,pstm,rs,sql.toString(),params);
            while (rs.next()){
                User _user = new User();
                _user.setId(rs.getInt("id"));
                _user.setUserCode(rs.getString("userCode"));
                _user.setUserName(rs.getString("userName"));
                _user.setGender(rs.getInt("gender"));
                _user.setBirthday(rs.getDate("birthday"));
                _user.setPhone(rs.getString("phone"));
                _user.setUserRole(rs.getInt("userRole"));
                _user.setUserRoleName(rs.getString("userRoleName"));
                userList.add(_user);
            }
            BaseDao.closeResoure(null,pstm,rs);
        }
        return userList;
    }

userService

//根据条件查询用户列表
public List<User> getUserList(String queryUserName,int queryUserRole,int currentPageNo,int pageSize);

userServiceImpl

//获取用户列表
    @Override
    public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {
        Connection connection =null;
        List<User> userList =null;
        System.out.println("queryUserName-->" + queryUserName);
        System.out.println("queryUserRole-->" + queryUserRole);
        System.out.println("currentPageNo-->" + currentPageNo);
        System.out.println("pageSize-->" + pageSize);
        try {
            connection = BaseDao.getConnection();
            userList = userDao.getUserList(connection,queryUserName, queryUserRole, currentPageNo, pageSize);
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResoure(connection,null,null);
        }
        return userList;
    }

3、获取角色操作#

为了我们职责统一，可以把角色的操作单独拿出来

RoleDao

//获取角色列表
public List<Role> getRoleList(Connection connection) throws SQLException;

RoleDaoImpl

    //获取角色列表
    @Override
    public List<Role> getRoleList(Connection connection) throws SQLException {
        PreparedStatement pstm = null;
        ResultSet rs = null;
        ArrayList<Role> rolelist = new ArrayList<Role>();

        if (connection!=null){
            String sql = "select * from smbms_role";
            Object[] params = {};
            rs = BaseDao.execute(connection,pstm,rs,sql,params);
            while (rs.next()){
                Role _role = new Role();
                _role.setId( rs.getInt("id"));
                _role.setRoleCode(rs.getString("roleCode"));
                _role.setRoleName(rs.getString("roleName"));
                rolelist.add(_role);
            }
            BaseDao.closeResoure(null,pstm,rs);
        }
        return rolelist;
    }

RoleService

//获取角色列表
public List<Role> getRoleList();

RoleServiceImpl

//获取角色列表
public class RoleServiceImpl implements RoleService{
    //引入Dao
    private RoleDao roleDao;
    public RoleServiceImpl(){
        roleDao = new RoleDaoImpl();
    }
    @Override
    public List<Role> getRoleList() {
        Connection connection = null;
        List<Role> roleList =null;
        try {
            connection = BaseDao.getConnection();
            roleList = roleDao.getRoleList(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            BaseDao.closeResoure(connection,null,null);
        }
        return roleList;
    }
}

4、用户显示的Servlet#

从前端获取数据（查询）
判断请求是否需要执行，看参数的值
为了实现分页，需要计算出当前页面和总页面，页面大小
用户列表展示

返回前端

public void query(HttpServletRequest req, HttpServletResponse resp){
    //查询用户列表

    //从前端获取数据
    String queryUserName = req.getParameter("queryname");
    String temp = req.getParameter("queryUserRole");
    String pageIndex = req.getParameter("pageIndex");
    int queryUserRole = 0;

    //获取用户列表
    UserServiceImpl userService = new UserServiceImpl();
    List<User> userList =null;
    //第一次走这个请求，一定是第一页，页面大小固定
    int pageSize = 5; //可以把这个写道配置文件里，可以后期修改
    int currentPageNo = 1;

    if (queryUserName==null){
        queryUserName = "";
    }
    if (temp!=null && !temp.equals("")){
        queryUserRole = Integer.parseInt(temp);//给查询赋值 0.1，2，3
    }
    if (pageIndex!=null){
        currentPageNo = Integer.parseInt(pageIndex);
    }

    //获取用户总数(分页：上一页，下一页的情况)
    int totalCount = userService.getUserCount(queryUserName, queryUserRole);
    //总页数支持
    PageSupport pageSupport = new PageSupport();
    pageSupport.setCurrentPageNo(currentPageNo);
    pageSupport.setPageSize(pageSize);
    pageSupport.setTotalCount(totalCount);

    int totalPageCount = ((int)(totalCount/pageSize)) + 1; //总共有几页
    //控制首页和尾页
    //如果页面要小于1了，就显示第一页的东西
    if (totalPageCount<1){
        currentPageNo = 1;
    }else if(currentPageNo>totalPageCount){
        //当前页大于了最后一页
        currentPageNo = totalPageCount;
    }

    //获取用户列表展示
    userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
    req.setAttribute("userList",userList);

    //获取角色列表
    RoleServiceImpl roleService = new RoleServiceImpl();
    List<Role> roleList = roleService.getRoleList();
    req.setAttribute("roleList",roleList);

    req.setAttribute("totalCount",totalCount);
    req.setAttribute("currentPageNo",currentPageNo);
    req.setAttribute("totalPageCount",totalPageCount);
    req.setAttribute("queryUserName",queryUserName);
    req.setAttribute("queryUserRole",queryUserRole);

    //返回前端
    try {
        req.getRequestDispatcher("userlist.jsp").forward(req,resp);
    } catch (ServletException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}