package cn.test.net;  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 {          //new一个URL对象          URL url = new URL("http://img.hexun.com/2011-06-21/130726386.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 = conn.getInputStream();          //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 =http://www.mamicode.com/ 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("BeautyGirl.jpg");          //创建输出流          FileOutputStream outStream = new FileOutputStream(imageFile);          //写入数据          outStream.write(data);          //关闭输出流          outStream.close();      }      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();      }  }