BeanUtils数据封装与表单JavaBean

一.BeanUtils工具的解释

(1)Apache的Commons组件中,提供了一个有用的工具类BeanUtils,利用它能够方便的将表单数据值填充值Bean中;

(2)javax.servlet.ServletRequest.getParameterMap()

在ServletRequest接口中,getParameter()方法的作用在于将客户端传来的参数封装在一个Map对象中,致谢参数可以通过GET POST

方法提交;

(3)org.apache.commons.beanutils.BeanUtils.populate()

这个方法的作用是将存储在Map中的参数填入给定的一个JavaBean对象中;

BeanUtils.populate(),第一个形参是一个bean对象,也就是表单的JavaBean,第二个形参是一个Map对象,也就是存储有表单圆度的Map对象;

二.举例详解

(1)编写一个JavaBean程序类RegForm

    package my;  
    public class RegForm   
    {  
        private String userName;  
        private String password;  
        private String sect;  
        private String hobby[];  
        private String memo;  
          
        public void setUserName(String s)  
        {  
            userName=s;  
            }  
        public String getUserName()  
        {  
            return userName;  
            }  
        public void setPassword(String s)  
        {  
            password=s;  
            }  
        public String getPassword()  
        {  
            return password;  
            }  
          
       public void setSect(String s)  
        {  
            sect=s;  
            }  
        public String getSect()  
        {  
            return sect;  
            }   
                  
        public void setHobby(String s[])  
        {  
            hobby=s;  
            }  
        public String[] getHobby()  
        {  
            return hobby;  
            }   
         public void setMemo(String s)  
        {  
            memo=s;  
            }  
        public String getMemo()  
        {  
            return memo;  
            }   
    }  

(2)新建一个填写数据的表单

    <%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>  
    <!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=gb2312" />  
    <title>无标题文档</title>  
    </head>  
      
    <body>  
    <jsp:useBean id="my" class="my.RegForm" scope="page"/>  
    <jsp:setProperty name="my" property="*"/> //反射机制将表单自动填到‘my’表单中  
    <br>您的用户名是:<jsp:getProperty name="my" property="userName"/>  
    <br>您的口令是:  <jsp:getProperty name="my" property="password"/>  
    <br>您的性别是:<jsp:getProperty name="my" property="sect"/>  
    <br>您的爱好是:  
    <%  
         String h[]=my.getHobby();  
         if(h!=null)  
         for(int i=0;i<h.length;i++)  
           out.print(h[i]);  
    %>  
    <br>您的附言是:<jsp:getProperty name="my" property="userName"/>  
    </body>  
    </html>  

(3)新建一个Servlet程序    reformServlet处理表单

    package my;  
    import javax.servlet.*;  
    import javax.servlet.http.*;  
    import java.io.*;  
    import java.util.*;  
    import org.apache.commons.beanutils.*;  
      
    public class RegFormServlet extends HttpServlet   
    {    
      protected void doGet(HttpServletRequest request,HttpServletResponse response)  
                             throws ServletException,java.io.IOException  
       {  
          ServletContext application=getServletContext() ;  
          ServletConfig config=getServletConfig() ;  
          response.setContentType("text/html;charset=gb2312");  
          PrintWriter out=response.getWriter();   
          HttpSession session =request.getSession();  
          request.setCharacterEncoding("gb2312");  
            
          RegForm form=new RegForm();  
          Map  map=request.getParameterMap();  
          try  
          {  
             BeanUtils.populate(form,map);  
          }catch(Exception e)  
          {  
            System.out.println("表单处理出错:"+e);  
            }  
          
        out.print("<br>您的姓名是:"+form.getUserName());  
        out.print("<br>您的口令是:"+form.getPassword());  
        out.print("<br>您的性别是:"+form.getSect());  
        out.print("<br>您的爱好是:");  
        String h[]=form.getHobby();  
        if(h!=null)  
         for(int i=0;i<h.length;i++)  
           out.print(h[i]);  
        out.print("<br>您的附言是:"+form.getMemo());    
      }   
            
    protected void doPost(HttpServletRequest request,HttpServletResponse response)  
                                    throws ServletException,java.io.IOException  
      {  
           doGet(request,response);  
        }  
    }  

(4)还有一个创建数据的界面

    <%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>  
    <!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=gb2312" />  
    <title>无标题文档</title>  
    </head>  
      
    <body>  
    <form id="form1" name="form1" method="post" action="exam.jsp">  
      <p>会员注册信息</p>  
      <p>用户名:  
        <label>  
        <input name="userName" type="text" id="userName" />  
        </label>  
    </p>  
      <p>口令:  
        <label>  
        <input name="password" type="password" id="password" />  
        </label>  
      </p>  
      <p>性别:  
        <label>  
        <input name="sect" type="radio" value="男" checked="checked" />  
        </label>  
      男  
      <label>  
      <input type="radio" name="sect" value="女" />  
      </label>  
      女</p>  
      <p>爱好:  
        <label>  
        <input name="hobby" type="checkbox" id="hobby" value="篮球" />  
        </label>  
      篮球  
      <label>  
      <input name="hobby" type="checkbox" id="hobby" value="排球" />  
      </label>  
      排球  
      <label>  
      <input name="hobby" type="checkbox" id="hobby" value="足球" />  
      </label>  
      足球</p>  
      <p>附言:  
        <label>  
        <textarea name="memo" id="memo"></textarea>  
        </label>  
        <label>  
        <input type="submit" name="Submit" value="提交" />  
        </label>  
      </p>  
    </form>  
    </body>  
    </html>  

来自:http://blog.csdn.net/xlgen157387/article/details/39346121

转自:http://www.open-open.com/lib/view/open1411349744125.html

posted @ 2017-01-16 14:53  N神3  阅读(233)  评论(0编辑  收藏  举报