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从jsp页面提交数据到servlet页面问题

2012-09-22 19:02 295 查看

input.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
pageEncoding="gb2312"%>
<!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=gb2312">
<title>Insert title here</title>
</head>
<body>
<form action="<%=request.getContextPath()%>/ShowServlet">
<table>
<tr>
<td>用户名</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="text" name="pass"></td>
</tr>
<tr>
<td><input type="submit" value="登录"></td>
<td><input type="reset" value="取消"></td>
</tr>
</table>
</form>
</body>
</html>

此处值得注意的是action的值应该<%=request.getContextPath()%>/ShowServlet，其中<%=request.getContextPath()%>代表的是当前项目，/ShowServlet代表的是web.xml中配置的url-pattern。(表示之前不知道，找了很久……

ShowServlet.java

package com.cn.student;

import java.io.IOException;
import java.io.PrintWriter;

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 ShowServlet extends HttpServlet {
PrintWriter pw = null;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
this.doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("gb2312");
resp.setContentType("text/html;charset=gb2312");
pw = resp.getWriter();
String name = req.getParameter("username");
String pass = req.getParameter("pass");
pw.println("你输入的用户名为:" + name);
pw.println("<br>");
pw.println("你输入的密码为：" + pass);
}

}

web.xml配置如下

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>MyDemo</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>ShowServlet</servlet-name>
<servlet-class>com.cn.student.ShowServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ShowServlet</servlet-name>
<url-pattern>/ShowServlet</url-pattern>
</servlet-mapping>
</web-app>

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