使用Session跳转

最新推荐文章于 2022-11-01 21:23:20 发布

NewBee.Mu

最新推荐文章于 2022-11-01 21:23:20 发布

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分类专栏： Session java Servlet

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本文介绍了一个使用HTML和Java Servlet实现的简单会话管理示例，通过设置和读取Session来保存用户登录信息，并在不同页面间共享。示例展示了如何在登录后跳转并显示用户信息。

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效果图见Cookie跳转效果图
代码：
index2.html：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="/session/login" method="post">
		姓名：<input type="text" name="username"/><br/>
		密码：<input type="text" name="password"/><br/>
		<input type="submit" value="登录"/>
	</form>
</body>
</html>

LoginServlet.java：

package text.session.servlet;

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

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;

@WebServlet("/session/login")
public class LoginServlet extends HttpServlet{

	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		String username = req.getParameter("username");
		String password = req.getParameter("password");
		resp.setContentType("text/html;charset=UTF-8");

		// 1.创建Session对象：
		HttpSession session = req.getSession();
		
		//2.向session中保存数据
		session.setAttribute("username", username);
		
		if(true) {
			
			PrintWriter writer = resp.getWriter();
			writer.write("欢迎"+username+"登录");
			writer.write("</br>");
			writer.write("<a href='/session/address'>收件地址</a>");
		}
	
	}

}

AddressServlet.java：

package text.session.servlet;

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

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;

@WebServlet("/session/address")
public class AddressServlet extends HttpServlet{

	private Object String;

	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String username = null;
		resp.setContentType("text/html;charset=UTF-8");

		//从Session中获取第一次请求时的数据
		//1.获取第一次请求时创建的Session
		HttpSession session = req.getSession();

		
		//删除session中的值
		//session.removeAttribute("username");
		
		
		//2.从Session 中获取用户名的信息：
		username = (String)session.getAttribute("username");
		
		
		PrintWriter writer = resp.getWriter();
		writer.write("欢迎"+username+"登录");
		writer.write("</br>");
		writer.write("北京朝阳</br>");
		writer.write("北京昌平</br>");
	}

}