ServletContext 獲取總成功總數(跳轉到成功頁面)

時間 2019-11-12

原文原文鏈接

用戶場景：在網頁裏輸入：http://localhost:8080/Demo04/login_success.html ，出現登錄界面（login.html），輸入正確帳戶密碼後，點擊提交後便跳轉到另外一個 html 頁面。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>請輸入如下內容，完成登錄</h2>
		帳號：<input type="text" name="username"/><br>
		密碼：<input type="text" name="password"/><br>
		<input type="submit" value="登錄">
	</form>
</body>
</html>

登錄成功頁面 login_success.html測試

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

	<h2>登錄成功了</h2>
	<a href="">獲取網站登錄總數</a>
</body>
</html>

測試類網站

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 響應數據給瀏覽器，就靠這個對象
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//1.獲取數據
		
		String userName = request.getParameter("username");
		String password = request.getParameter("password");
		System.out.println("userName="+userName+"password"+password);
		//2.校驗數據
		PrintWriter pw = response.getWriter();
		
		
		if("admin".equals(userName) && "123".equals(password)){
//			System.out.println("登錄成功");
			pw.write("login success....");
			
			//設置狀態碼,從新定位狀態碼
			response.setStatus(302);
			
			//成功就會跳轉到 login.html網頁
			response.setHeader("Location", "login_success.html");
			
			
			
		}else{
//			System.out.println("登錄失敗");
			pw.write("login faild...");
		}
	}

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

}

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