ServletContext 获取总成功总数(跳转到成功页面)

时间 2019-11-12

原文原文链接

用户场景：在网页里输入：http://localhost:8080/Demo04/login_success.html ，出现登录界面（login.html），输入正确帐户密码后，点击提交后便跳转到另外一个 html 页面。html

作法：java

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="LoginServlet" method="get">
		<h2>请输入如下内容，完成登录</h2>
		帐号：<input type="text" name="username"/><br>
		密码：<input type="text" name="password"/><br>
		<input type="submit" value="登录">
	</form>
</body>
</html>

登录成功页面 login_success.html测试

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

	<h2>登录成功了</h2>
	<a href="">获取网站登录总数</a>
</body>
</html>

测试类网站

package com.itheima.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 LoginServlet extends HttpServlet {
	
	
	
	//response 响应数据给浏览器，就靠这个对象
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//1.获取数据
		
		String userName = request.getParameter("username");
		String password = request.getParameter("password");
		System.out.println("userName="+userName+"password"+password);
		//2.校验数据
		PrintWriter pw = response.getWriter();
		
		
		if("admin".equals(userName) && "123".equals(password)){
//			System.out.println("登录成功");
			pw.write("login success....");
			
			//设置状态码,从新定位状态码
			response.setStatus(302);
			
			//成功就会跳转到 login.html网页
			response.setHeader("Location", "login_success.html");
			
			
			
		}else{
//			System.out.println("登录失败");
			pw.write("login faild...");
		}
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		doGet(request, response);
	}

}