BeanUtils數據封裝與表單JavaBean
一.BeanUtils工具的解釋
(1)Apache的Commons組件中,提供了一個有用的工具類BeanUtils,利用它能夠方便的將表單數據值填充值Bean中;
(2)javax.servlet.ServletRequest.getParameterMap()
在ServletRequest接口中,getParameter()方法的作用在于將客戶端傳來的參數封裝在一個Map對象中,致謝參數可以通過GET POST
方法提交;
(3)org.apache.commons.beanutils.BeanUtils.populate()
這個方法的作用是將存儲在Map中的參數填入給定的一個JavaBean對象中;
BeanUtils.populate(),第一個形參是一個bean對象,也就是表單的JavaBean,第二個形參是一個Map對象,也就是存儲有表單圓度的Map對象;
二.舉例詳解
(1)編寫一個JavaBean程序類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)新建一個填寫數據的表單
<%@ 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>無標題文檔</title> </head> <body> <jsp:useBean id="my" class="my.RegForm" scope="page"/> <jsp:setProperty name="my" property="*"/> //反射機制將表單自動填到‘my’表單中 <br>您的用戶名是:<jsp:getProperty name="my" property="userName"/> <br>您的口令是: <jsp:getProperty name="my" property="password"/> <br>您的性別是:<jsp:getProperty name="my" property="sect"/> <br>您的愛好是: <% 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)新建一個Servlet程序 reformServlet處理表單
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("表單處理出錯:"+e); } out.print("<br>您的姓名是:"+form.getUserName()); out.print("<br>您的口令是:"+form.getPassword()); out.print("<br>您的性別是:"+form.getSect()); out.print("<br>您的愛好是:"); 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)還有一個創建數據的界面
<%@ 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>無標題文檔</title> </head> <body> <form id="form1" name="form1" method="post" action="exam.jsp"> <p>會員注冊信息</p> <p>用戶名: <label> <input name="userName" type="text" id="userName" /> </label> </p> <p>口令: <label> <input name="password" type="password" id="password" /> </label> </p> <p>性別: <label> <input name="sect" type="radio" value="男" checked="checked" /> </label> 男 <label> <input type="radio" name="sect" value="女" /> </label> 女</p> <p>愛好: <label> <input name="hobby" type="checkbox" id="hobby" value="籃球" /> </label> 籃球 <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>來自:http://blog.csdn.net/xlgen157387/article/details/39346121
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