servlet开发7--Cookie

服务端创建CookieServlet, 返回cookie给客户端:

package com.king;import java.io.IOException;import javax.servlet.*;import javax.servlet.http.*;import java.util.*;import java.io.*;public class CookieServlet extends HttpServlet {public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {System.out.println("ParamServlet doGet -------");Cookie[] cookies = req.getCookies();if (cookies == null || cookies.length == 0) {System.out.println("No Cookies");Cookie co = new Cookie("user", "normal");co.setMaxAge(3600);resp.addCookie(co);}PrintWriter out = resp.getWriter();out.println("<h1>CookieTest</h1>");}public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{doGet(req, resp);}}

抓包, 结果就是:

1. HTTP/1.1 200 OK
2. Server: Apache-Coyote/1.1
3. Set-Cookie: user=normal; Expires=Mon, 18-May-2015 06:20:30 GMT
4. Content-Length: 20
5. Date: Mon, 18 May 2015 05:20:30 GMT

浏览器会保存cookie信息, 下次再访问CookieServlet时， 会把cookie信息带上，如下:

1. GET /MyApp/CookieServlet HTTP/1.1
2. Host: localhost:8080
3. Connection: keep-alive
4. Cache-Control: 
5. max-age=0
6. Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
7. User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36
8. Accept-Encoding: gzip, deflate, sdch
9. Accept-Language: zh-CN,zh;q=0.8
10. Cookie: user=normal