1.简单jsp页面login.jsp 如下代码
注意:action="login" 一定要和配置web.xml中url-pattern要一致,
需要注意的是url-pattern这里写的是/login,而在jsp中form表单的action写的是login,而不是/login。
<input type="submit" value="登入"/> type类型是submit
<%@ 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>
<title>登入</title>
<head>
<base href="<%=basePath%>">
<script type="text/javascript" src="js/jquery-2.1.1.js"></script>
</head>
<body>
<form action="login" method="post" id= "from">
<div>
<span>员工编号:</span>
<input type="text" name="userName" id= "userName"/>
</div>
<div>
<span>密 码:</span>
<input type="password" name="password" id= "password"/>
</div>
<div>
<input type="hidden" name="token" id= "token" value="${token}"/>
</div>
<input type="submit" value="登入"/>
</form>
<script type="text/javascript">
</script>
</body>
</html>
2.web.xml 代码如下
<servlet-class>com.zlp.login.loginAction</servlet-class> 映射实现类
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<display-name></display-name>
<!--监听用户登入会话信息 -->
<listener>
<listener-class>com.zlp.login.loginListener</listener-class>
</listener>
<servlet>
<servlet-name>loginAction</servlet-name>
<servlet-class>com.zlp.login.loginAction</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginAction</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3.LoginAction控制层实现代码
req.getParameter("参数");去后台参过来的参数
String userName = req.getParameter("userName");
package com.zlp.login;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class loginAction extends HttpServlet{
public final String USERNAME = "1234";
public final String PASSWORD = "1234";
@SuppressWarnings("unused")
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.getRequestDispatcher("/jsp/login/check.jsp").forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String userName = req.getParameter("userName");
String token = req.getParameter("token");
System.out.print(token);
}
}