下载网络上的图片，并且保存在指定的文件夹中

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源代码：EmotionManager类

/** *EmotionManager.java *2011-11-1 下午09:35:02 *Touch Android *http://bbs.droidstouch.com */package Util;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.BlockingQueue;/** * 下载网络上的图片的统一类，以后下载什么图片都可以调用 */public class EmotionManager{         private String root="/sdcard/emotions/";      private BlockingQueue<String> urlQueue =null;            public EmotionManager( int emotionSize)   {      urlQueue = new ArrayBlockingQueue(emotionSize);      createDir();   }         public void putURL(String url)   {      try      {         urlQueue.put(url);      } catch (InterruptedException e)      {         e.printStackTrace();      }   }      public void createDir()   {            File file = new File(root);      if(file.exists())         file.mkdirs();         }         public void startThread()   {            new DownloadImageThread().start();   }               public void downEmotions(String url)   {      try      {         down(url);      } catch (Exception e)      {         e.printStackTrace();      }         }         public void down(String url) throws Exception   {            URL u = new URL(url);          HttpURLConnection connection =    (HttpURLConnection) u.openConnection();       String path = root + getEmotionName(url);    saveFile(path, connection.getInputStream());         }            public String getEmotionName(String url)   {            return url.substring(url.lastIndexOf(".") +1);         }            public void saveFile(String path,InputStream is)   {                  BufferedInputStream bis = null;      BufferedOutputStream bos = null;            FileOutputStream fos = null;                  try      {         bis = new BufferedInputStream(is);         fos = new FileOutputStream(new File(path));         bos = new BufferedOutputStream(fos);                  byte[] buffer = new byte[1024];         int length;                  while((length = bis.read(buffer)) != -1)         {            bos.write(buffer, 0, length);         }               } catch (Exception e)      {               }      finally      {                  try         {            if(null != bis)            {               bis.close();            }                        if(fos != null)               fos.close();            if(null != bos)               {                  bos.flush();                  bos.close();                              }                     }         catch (IOException e)         {            e.printStackTrace();         }      }               }         private  class DownloadImageThread extends Thread   {                  private boolean isRun=true;            public void shutDown()      {         isRun =false;      }                  public void run()      {         try         {            while(isRun)            {               String url= urlQueue.poll();                              if(null == url) break;                              downEmotions(url);            }         }         catch (Exception e)         {                     }         finally         {            shutDown();         }               }                           }                  }

调用：在activity的refresh中调用

@Overridepublic void refresh(Object... params) {    List<Emotion> lists= (List<Emotion>) params[0];    EmotionManager manager = new EmotionManager(lists.size());    for (Emotion emotion : lists)    {        manager.putURL(emotion.getUrl());                  //下载的url放入        Log.i("AtActivity", emotion.getPhrase());        Log.i("AtActivity", emotion.getUrl());    }    manager.startThread();                                //开启下载的线程    progressDialog.dismiss();}

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