package com.carl.carlapp.test;

 import java.io.FileOutputStream;

 import java.io.InputStream;

 import java.net.CookieHandler;

 import java.net.CookieManager;

 import java.net.CookieStore;

 import java.net.HttpCookie;

 import java.net.HttpURLConnection;

 import java.net.URL;

 import java.net.URLConnection;

 import java.util.Date;

 import java.util.List;

 /**

  * @author 作者 Carl Zhang. E-mail: carlzhangweiwen@sina.com

  * @version 创建时间：2016年3月2日 下午10:39:52

  * 类说明

  */

 public class CookieTest {

      public static void main(String args[]) throws Exception {

 //            String urlString = "http://58.215.195.18:10010/login_person.jsp";

              String urlString = "http://58.215.195.18:10010/jcaptcha?date="+ new Date().getTime();         

             CookieManager manager = new CookieManager();

             CookieHandler.setDefault(manager);

             URL url = new URL(urlString);

             HttpURLConnection httpConn = (HttpURLConnection) url.openConnection(); 

             //将得到的验证码保存下来

             saveFile(httpConn, "E:\\tset33.jpg");

 //            Object content = httpConn.getContent();

 //            String contentType = httpConn.getContentType();

 //            System.out.println(contentType);//MIME type:text/html

             //因为http已经做了请求，所以会得到cookie

             CookieStore cookieJar = manager.getCookieStore();

             List<HttpCookie> cookies = cookieJar.getCookies();

             for (HttpCookie cookie : cookies) {

               System.out.println(cookie);

             }

           }

      public static void saveFile(URLConnection conn,String fullPath){

          saveFile(conn, fullPath, 8);

      }

      /**

       * 讲文件保存下来

       * @param conn URLConnection连接

       * @param fullPath 文件路径及文件名

       * @param length 每次读文件字节数

       */

      public static void saveFile(URLConnection conn, String fullPath, int length){

             try {

                 if(conn == null){

                     throw new Exception("Can't get URLConnection.");

                 }

                 InputStream is = conn.getInputStream();

                 FileOutputStream fos = new FileOutputStream(fullPath);

                 byte[] b = new byte[length];

                 int len = 0;

                 while((len = is.read(b)) != -1){

                     fos.write(b,0,len);

                 }

                 fos.flush();

                 fos.close();

                 is.close();

             } catch (Exception e) {

                 e.printStackTrace();

             }

         }

 }