Android读取服务器图片的三种方法

public static Bitmap getImage(String path){ 
   
  try { 
    HttpURLConnection conn = (HttpURLConnection) new URL(path).openConnection(); 
    conn.setConnectTimeout(5000); 
    conn.setRequestMethod("GET"); 
    System.out.println("tdw1"); 
    if(conn.getResponseCode() == 200){ 
      InputStream inputStream = conn.getInputStream(); 
      Bitmap bitmap = BitmapFactory.decodeStream(inputStream);   
      return bitmap; 
    } 
  } catch (Exception e) { 
    e.printStackTrace(); 
  } 
  return null; 
} 

image.setImageBitmap(getImage("路径")); 

public static Bitmap getImage1(String path){ 
   
    HttpGet get = new HttpGet(path); 
    HttpClient client = new DefaultHttpClient(); 
    Bitmap pic = null; 
     try { 
      HttpResponse response = client.execute(get); 
      HttpEntity entity = response.getEntity(); 
      InputStream is = entity.getContent(); 
 
      pic = BitmapFactory.decodeStream(is);  // 关键是这句代 
  } catch (Exception e) { 
    e.printStackTrace(); 
  } 
  return pic; 
} 

public static Uri getImage2(String path,File cacheDir){ 
    File localFile = new File(cacheDir,MD5.getMD5(path)+path.substring(path.lastIndexOf("."))); 
    if(localFile.exists()){ 
      return Uri.fromFile(localFile); 
    }else 
    { 
      HttpURLConnection conn; 
      try { 
        conn = (HttpURLConnection) new URL(path).openConnection(); 
        conn.setConnectTimeout(5000); 
        conn.setRequestMethod("GET"); 
        if(conn.getResponseCode() == 200){ 
          System.out.println("tdw"); 
          FileOutputStream outputStream = new FileOutputStream(localFile); 
          InputStream inputStream = conn.getInputStream(); 
          byte[] buffer = new byte[1024]; 
          int length = 0; 
          while((length=inputStream.read(buffer))!=-1){ 
            outputStream.write(buffer, 0, length); 
          } 
          inputStream.close(); 
          outputStream.close(); 
          return Uri.fromFile(localFile); 
        } 
      } catch (Exception e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
      } 
    } 
    return null;   
  } 

image.setImageURI(getImage2(path, cache)); 

cache = new File(Environment.getExternalStorageDirectory(),"cache"); 
if(!cache.exists()){ 
  cache.mkdirs(); 
}