import java.io.ByteArrayOutputStream;      import java.io.File;      import java.io.FileOutputStream;      import java.io.InputStream;      import java.net.HttpURLConnection;      import java.net.URL;      public class ImageRequest {          /**         * @param args         */          public static void main(String[] args) throws Exception {              int one=1;            int two=1;            while(true){                        //new一个URL对象              URL url = new URL("http://www.open-open.com/code/images/opencode.jpg");              //打开链接              HttpURLConnection conn = (HttpURLConnection)url.openConnection();              //设置请求方式为"GET"              conn.setRequestMethod("GET");              //超时响应时间为5秒             // conn.setConnectTimeout(5 * 1000);              //通过输入流获取图片数据              InputStream inStream=null;            try{              inStream = conn.getInputStream();              }catch (Exception e) {                   System.out.println("Error"+one+","+two);                System.out.println("///");                if(two==20){                    one++;                    two=1;                }else{                    two++;                }                if(one==21){                    return;                }                continue;            }            //得到图片的二进制数据，以二进制封装得到数据，具有通用性              byte[] data = readInputStream(inStream);              //new一个文件对象用来保存图片，默认保存当前工程根目录              File imageFile = new File(one+","+two+".jpg");              System.out.println(one+","+two);            //创建输出流              FileOutputStream outStream = new FileOutputStream(imageFile);              //写入数据              outStream.write(data);              //关闭输出流              outStream.close();                          if(two==20){                one++;                two=1;            }else{                two++;            }            if(one==20){                return;            }                        }                    }          public static byte[] readInputStream(InputStream inStream) throws Exception{              ByteArrayOutputStream outStream = new ByteArrayOutputStream();              //创建一个Buffer字符串              byte[] buffer = new byte[1024];              //每次读取的字符串长度，如果为-1，代表全部读取完毕              int len = 0;              //使用一个输入流从buffer里把数据读取出来              while( (len=inStream.read(buffer)) != -1 ){                  //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度                  outStream.write(buffer, 0, len);              }              //关闭输入流              inStream.close();              //把outStream里的数据写入内存              return outStream.toByteArray();          }      }