Servlet --cookie编码保存中文信息

   

    

     

      

     
     

      

       package test09_2Servlet;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       import java.io.IOException;
      
     
    

     

      

     
     

      

       import java.io.PrintWriter;
      
     
    

     

      

     
     

      

       import java.net.URLDecoder;
      
     
    

     

      

     
     

      

       import java.net.URLEncoder;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       import javax.servlet.ServletException;
      
     
    

     

      

     
     

      

       import javax.servlet.http.Cookie;
      
     
    

     

      

     
     

      

       import javax.servlet.http.HttpServlet;
      
     
    

     

      

     
     

      

       import javax.servlet.http.HttpServletRequest;
      
     
    

     

      

     
     

      

       import javax.servlet.http.HttpServletResponse;
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       public class EncodeServlet extends HttpServlet {
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
	
      
     
    

     

      

     
     

      
	public void doGet(HttpServletRequest request, HttpServletResponse response)
      
     
    

     

      

     
     

      
			throws ServletException, IOException {
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       		response.setContentType("text/html");
      
     
    

     

      

     
     

      
		PrintWriter out = response.getWriter();
      
     
    

     

      

     
     

      
		
      
     
    

     

      

     
     

      

       	}
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
	
      
     
    

     

      

     
     

      
	public void doPost(HttpServletRequest request, HttpServletResponse response)
      
     
    

     

      

     
     

      
			throws ServletException, IOException {
      
     
    

     

      

     
     

      
		
      
     
    

     

      

     
     

      
		//设置响应的编码格式
      
     
    

     

      

     
     

      

       		response.setContentType("text/html;charset=UTF-8");
      
     
    

     

      

     
     

      
		//设置请求的编码格式
      
     
    

     

      

     
     

      

       		request.setCharacterEncoding("UTF-8");
      
     
    

     

      

     
     

      
		//获取输出的字符流
      
     
    

     

      

     
     

      
		PrintWriter out = response.getWriter();
      
     
    

     

      

     
     

      
		//获取用户提交的用户名
      
     
    

     

      

     
     

      
		String name = request.getParameter("name");
      
     
    

     

      

     
     

      
		//cookie的name如果是中文进行url编码
      
     
    

     

      

     
     

      

       		name = URLEncoder.encode(name,"UTF-8");
      
     
    

     

      

     
     

      
		//创建cookie，保存用户名称到vlue中
      
     
    

     

      

     
     

      
		Cookie ck = new Cookie("ckname",name);
      
     
    

     

      

     
     

      
		//设置cookie过期时间为60分钟
      
     
    

     

      

     
     

      

       		ck.setMaxAge(60*60);
      
     
    

     

      

     
     

      
		//设置cookie可以访问的路径为项目下的组件都可以访问
      
     
    

     

      

     
     

      

       		ck.setPath(request.getContextPath());
      
     
    

     

      

     
     

      
		//保存cookie到本地
      
     
    

     

      

     
     

      

       		response.addCookie(ck);
      
     
    

     

      

     
     

      
		
      
     
    

     

      

     
     

      
		//读取cookie，输出cookie信息。
      
     
    

     

      

     
     

      

       		Cookie[] cc = request.getCookies();
      
     
    

     

      

     
     

      
		if(cc!=null){
      
     
    

     

      

     
     

      
			for(Cookie c:cc){
      
     
    

     

      

     
     

      
				String names = c.getName(); //输出cookie的name
      
     
    

     

      

     
     

      
				String value = c.getValue();//输出cookie的key
      
     
    

     

      

     
     

      

       				value = URLDecoder.decode(value, "UTF-8");
      
     
    

     

      

     
     

      
				/*
      
     
    

     

      

     
     

      

        * 客户端第一次登陆后，服务器端传输cookie并写到客户端。
      
     
    

     

      

     
     

      

        第二次登陆，request请求传给服务端，但在这个request中是不包含maxage值的，所以服务端取到的值还是默认值-1。
      
     
    

     

      

     
     

      

        也就是说设置完maxage值后，maxage不会再被服务端读取和修改了。这一过程由浏览器完成，浏览器判断maxage的值，
      
     
    

     

      

     
     

      

        从而判断cookie是否过期。
      
     
    

     

      

     
     

      

        */
      
     
    

     

      

     
     

      
				int maxAge = c.getMaxAge(); 
      
     
    

     

      

     
     

      
				//读取path永远是null。对于cookie来说，path是受保护的
      
     
    

     

      

     
     

      
				String path = c.getPath();
      
     
    

     

      

     
     

      
				
      
     
    

     

      

     
     

      

       				out.print("<hr/>name:"+names+",value:"+value+",maxAge:"+maxAge+",path:"+path);
      
     
    

     

      

     
     

      

       			}
      
     
    

     

      

     
     

      

       		}
      
     
    

     

      

     
     

      
		
      
     
    

     

      

     
     

      
		
      
     
    

     

      

     
     

      

       	}
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       }
      
     
   
  

   

    

     

      

     
     

      

       <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
      
     
    

     

      

     
     

      

       <%
      
     
    

     

      

     
     

      

       String path = request.getContextPath();
      
     
    

     

      

     
     

      

       String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
      
     
    

     

      

     
     

      

       %>
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
      
     
    

     

      

     
     

      

       <html>
      
     
    

     

      

     
     

      
  <head>
      
     
    

     

      

     
     

      
    <base href="<%=basePath%>">
      
     
    

     

      

     
     

      
    
      
     
    

     

      

     
     

      
    <title>My JSP 'index.jsp' starting page</title>
      
     
    

     

      

     
     

      
	<meta http-equiv="pragma" content="no-cache">
      
     
    

     

      

     
     

      
	<meta http-equiv="cache-control" content="no-cache">
      
     
    

     

      

     
     

      
	<meta http-equiv="expires" content="0">    
      
     
    

     

      

     
     

      
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
      
     
    

     

      

     
     

      
	<meta http-equiv="description" content="This is my page">
      
     
    

     

      

     
     

      
	<!--
      
     
    

     

      

     
     

      

        <link rel="stylesheet" type="text/css" href="styles.css">
      
     
    

     

      

     
     

      

        -->
      
     
    

     

      

     
     

      
  </head>
      
     
    

     

      

     
     

      
  
      
     
    

     

      

     
     

      
  <body>
      
     
    

     

      

     
     

      

           This is my JSP page. <br>
      
     
    

     

      

     
     

      
    <form action="EncodeServlet" method="post">
      
     
    

     

      

     
     

      
    <input type="text" name="name"/><br/>
      
     
    

     

      

     
     

      
    <input type="submit" value="提交"><br/>
      
     
    

     

      

     
     

      
    
      
     
    

     

      

     
     

      
    </form>
      
     
    

     

      

     
     

      
  </body>
      
     
    

     

      

     
     

      

       </html>
      
     
   
  

   

    

     

      

     
     

      

       <?xml version="1.0" encoding="UTF-8"?>
      
     
    

     

      

     
     

      

       <web-app version="3.0"
      
     
    

     

      

     
     

      
    xmlns="http://java.sun.com/xml/ns/javaee"
      
     
    

     

      

     
     

      
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      
     
    

     

      

     
     

      
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
      
     
    

     

      

     
     

      
  <servlet>
      
     
    

     

      

     
     

      
    <description>This is the description of my J2EE component</description>
      
     
    

     

      

     
     

      
    <display-name>This is the display name of my J2EE component</display-name>
      
     
    

     

      

     
     

      
    <servlet-name>EncodeServlet</servlet-name>
      
     
    

     

      

     
     

      
    <servlet-class>test09_2Servlet.EncodeServlet</servlet-class>
      
     
    

     

      

     
     

      
  </servlet>
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      
  <servlet-mapping>
      
     
    

     

      

     
     

      
    <servlet-name>EncodeServlet</servlet-name>
      
     
    

     

      

     
     

      
    <url-pattern>/EncodeServlet</url-pattern>
      
     
    

     

      

     
     

      
  </servlet-mapping>
      
     
    

     

      

     
     

      
 
      
     
    

     

      

     
     

      

       </web-app>