已登录页面为例子：
1.login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="login">
username:<input type="text" name="username" /><br>
password:<input type="password" name="password" ><br>
repassword:<input type="password" name="repassword"><br>
age:<input type="text" name="age"/>
<input type="submit" value="submits">
</form></body>
</html>
2.在xml中配置好传输信息
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"><servlet>
<servlet-name>Login</servlet-name>
<servlet-class>com.servlet.LoginServlet</servlet-class>
</servlet><servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping></web-app>
3.通过xml配置信息找到对应的处理class类。
package com.servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet
{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
String username = req.getParameter("username");
String password = req.getParameter("password");
String repassword = req.getParameter("repassword");
int age = Integer.parseInt(req.getParameter("age"));String result = "";
if(age > 18)
{
result = "success";
}
else
{
result += "age <= 18";
}
if(!password.equals(repassword))
{
result += "password != repassword";
}req.setAttribute("username", username);
req.setAttribute("age", age);
//转发
RequestDispatcher rd = req.getRequestDispatcher("result.jsp");//遍历一个list。额外加上的。测试request后得到的是一个枚举类型数据
List<String> list = new ArrayList<String>();
for(int i = 0; i < 100; i++)
{
list.add(String.valueOf(i));
}
req.setAttribute("list", list);}
}
4.结果页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.List" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>username:<%= request.getAttribute("username") %>
age:<%= request.getAttribute("age") %>
<%
List<String> list = (List<String>)request.getAttribute("list");
for(int i = 0; i < list.size(); i++)
{
%>
<%= list.get(i) %><br>
<%
}%>
</body>
</html>
完成，收工，其中有些变量没有得到值，是因为没有将其存入到request容器中。
只是个例子，如果需要，留下言，我可以将其他的补全。