利用session来做登录功能，代替cookie

最新推荐文章于 2023-04-16 15:42:41 发布

原创最新推荐文章于 2023-04-16 15:42:41 发布 · 1.4k 阅读

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本文介绍了一个使用两个Servlet和两个HTML页面实现数据提交的过程。首先通过1.html提交数据并跳转到servlet1进行处理，servlet1处理后将数据存入session并跳转到2.html。2.html提交数据后跳转到servlet2，servlet2从session中获取先前的数据并处理2.html提交的数据。

同样，还是两个servlet

两个HTML静态页面来提交数据

流程先访问1.html

1.html提交数据后跳转到servlet1 处理数据

处理完后servlet1跳转到2.html，继续提交剩余数据

当2.html提交数据后跳转到servlet2去处理数据，并且通过session获取到第一步填写的数据，并将他们全部打印在电脑屏幕上

1.html代码：

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




	<form action="/session_demo/hello" method="post">
		姓名：<input name="name" type="text"><br><br>
		
		密码：<input name="password" type="password"><br><br>
		
		职业：<input name="job" type="radio" value="1">teacher
		<input name="job" type="radio" value="2">student
		<br><br>
		提交：<input name="submi" type="submit"><br><br>
		
	</form>

</body>
</html>

当1.html提交后跳转到servlet1去

servlet1代码：

package com.demo.wgg;

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

import javax.jms.Session;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class Demo extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//获取表单中的数据
		String username = request.getParameter("name");
		String password = request.getParameter("password");
		String job = request.getParameter("job");
		
		//创建session对象
		
		HttpSession session = request.getSession();
		
		//给session对象赋值 setAttribute(); 
		
		session.setAttribute("username", username);
		session.setAttribute("password", password);
		session.setAttribute("job", job);
		
		//跳转到2.html中
		
		request.getRequestDispatcher("/2.html").forward(request, response);
		
		
		
		
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}
}

servlet1处理完数据，并将获得的数据存储在session中之后跳转到2.html中

2.html代码：

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

	<form action="/session_demo/hello1" method="post">
		年龄：<input name="age" type="text"><br><br>
		
		
		爱好：<input name="favro" type="radio" value="1">篮球
		<input name="favor" type="radio" value="2">足球
		<br><br>
		提交：<input name="submi" type="submit"><br><br>
		
	</form>

</body>
</html>

2.html填写完成提交数据时，跳转到servlet2

由servlet2处理获得的数据，并且通过session获得之前servlet1存储的数据，并将他们全部打印在屏幕上：

servlet2代码：

package com.demo.wgg;

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;
import javax.servlet.http.HttpSession;

public class Demo1 extends HttpServlet {

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//获取表单2中提交的数据先
		
		String age = request.getParameter("age");
		String favor = request.getParameter("favor");
		
		//获取session对象
		
		HttpSession session  = request.getSession();
		
		//获取session中的属性
		
		String username = (String) session.getAttribute("username");
		String password = (String) session.getAttribute("password");
		String job = (String) session.getAttribute("job");
		
		//设置编码问题
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;UTF-8");
		//将所有属性都打印出来
		System.out.println("姓名是 : "+username);
		System.out.println("密码是 : "+password);
		System.out.println("年龄是 : "+age);
		System.out.println("爱好是 : "+favor);
		System.out.println("工作是 : "+job);
		
	}

}

注意Java中跳转链接的写法：。。。。。