cookie乱码处理示例

Posted 2020-09-29 岸芷兰香

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package com.log;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

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;

/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/LoginServlet.do")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, 

HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse 

response) throws ServletException, IOException {
       //首先设置响应和请求页面的编码格式：
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html charset=‘utf-8‘");
       //获取表单控件的数据
        Enumeration<String> nameEnu = request.getParameterNames();
        //创建list对象
        List<Object> list = new ArrayList<>();
        while(nameEnu.hasMoreElements())
        {
               list.add(request.getParameter(nameEnu.nextElement()));
        }
        //把数据放在session对象
        HttpSession session = request.getSession();
        if(list.size()>0){
        session.setAttribute("uName", list.get(0));
        }
        
        //第二种方式，通过Cookie保存用户信息
        Cookie cook1 = new Cookie("userName", URLEncoder.encode

(list.get(0).toString(),"utf-8"));
        cook1.setMaxAge(3*3600);
        response.addCookie(cook1);
        
//        request.getRequestDispatcher("/main.jsp").forward(request, 

response);
        response.sendRedirect(request.getContextPath()+"/welcome.jsp");
        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, 

HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse 

response) throws ServletException, IOException {
        doGet(request, response);
    }

}

接受页面：

<%@page import="java.net.URLDecoder"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 

"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>

<%
  session.setAttribute("uName", "你好");
  System.out.print(session.getId());
%>

<%
   //获取cookie对象 
  Cookie[] getCooks = request.getCookies();
  String user = null;
  if(getCooks.length > 0)
  {
      user = getCooks[0].getValue();
      user = URLDecoder.decode(user, "utf-8");
  }
%>

<body>
  <%=session.getAttribute("uName") %>已进入主页！
  <%=user%>
  
  <button onclick="location.href=‘main.jsp?u1=<%=user %>‘" type="button">跳转传

参</button>
</body>
</html>

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