jsp作业（1）--使用jsp+servlet完成一个表单验证
要求：使用jsp+servlet完成一个表单验证，通过表单提交信息给Servlet，Servlet获取到信息后，处理，把信息放到request对象中，如果用户提交的姓名为空，不能跳转，否则，将信息全部显示出来。
//index2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index2.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="#7FFFD4">
<center>
<h3>
表单提交
</h3>
<form action="servlet/TableSubmitServlet" method="post">
<table border="2px" width="260" height="192">
<tr>
<td>
username
</td>
<td>
<input type="text" name="username" />
</td>
</tr>
<tr>
<td>
sex
</td>
<td>
<input type="radio" name="sex" value="boy" />
boy
<input type="radio" name="sex" value="girl" />
girl
</td>
</tr>
<tr>
<td>
address
</td>
<td>
<input type="text" name="address" />
</td>
</tr>
<tr>
<td>
likes
</td>
<td>
<input type="checkbox" name="likes" value="sing" />
sing
<input type="checkbox" name="likes" value="dance" />
dance
<input type="checkbox" name="likes" value="game" />
game
</td>
</tr>
<tr>
<td>
</td>
<td>
<center>
<input type="submit" value="submit" />
<input type="reset" value="reset" />
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
//result2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'result2.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body bgcolor="#ADD8E6">
<%="用户名："+request.getAttribute("username") %><br/>
<%="性别："+request.getAttribute("sex") %><br/>
<%="地址："+request.getAttribute("address") %><br/>
<%="爱好："+request.getAttribute("like") %>
</body>
</html>
//TableSubmitServlet.java
package com.hbsi.servlet;
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;
public class TableSubmitServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String sex = request.getParameter("sex");
String address = request.getParameter("address");
String[] likes = request.getParameterValues("likes");
String like=" ";
for(int i=0;likes!=null && i<likes.length;i++){
like = like +" "+likes[i];
}
request.setAttribute("username", username);
request.setAttribute("sex", sex);
request.setAttribute("address", address);
request.setAttribute("like", like);
if(username.equals("")){
out.print("<h1>用户名为空，不能跳转，请输入用户名！！</h1>");
}else{
request.getRequestDispatcher("/result2.jsp").forward(request,response);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}