Cookie实现网页自动跳转-优快云博客

本文链接：https://blog.youkuaiyun.com/NewBeeMu/article/details/99761384

这篇博客介绍了如何利用Cookie技术实现在用户登录后自动跳转到特定页面的方法，通过示例代码展示了`index.jsp`、`LoginServlet.java`和`AddressServlet.java`的关键逻辑。

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效果图：
在这里插入图片描述

代码：
index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="cookie/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.cookie.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;

@WebServlet("/cookie/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");
		Cookie cookie=new Cookie("username",username);
		resp.addCookie(cookie);
		if(true) {
			PrintWriter writer = resp.getWriter();
			writer.write("欢迎"+username+"登录");
			writer.write("<br/>");
			writer.write("<a href='/day16/cookie/address'>收件地址</a>");
			
		}
	}
	

}

AddressServlet.java：

package text.cookie.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.swing.RepaintManager;

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

	
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		
		String username=null;
		resp.setContentType("text/html;charset=UTF-8");
		Cookie[] cookies=req.getCookies();
		for(Cookie cookie:cookies) {
			if("username".equals(cookie.getName())) {
				username=cookie.getValue();
			}
		}
		PrintWriter writer = resp.getWriter();
		writer.write("欢迎"+username+"登录");
		writer.write("<br/>");
		writer.write("北京<br/>");
		writer.write("上海<br/>");
		writer.write("杭州<br/>");
		
	}
	

}

使用Cookie跳转