举例：android从apache服务器获取文件(图像)，保存到相应的目录中，并从目录中将图像转变为Bitmap

 /*
			 * 参数 ：将要获取的服务器文件名 filename
			 * 如果成功，返回真
			*/
			boolean getImageByWeb2(String filename) { 
			    File img = new File(TEMP_WEB_IMAGE_PATH + filename); 
			    // Create directories 
			    new File(TEMP_WEB_IMAGE_PATH).mkdirs();
			    // only download new images 
			    if (!img.exists()) { 
			        try { 
			            URL imageUrl = new URL("http://10.10.145.154/WebImageProcess/output/" + filename); 
			            InputStream in = imageUrl.openStream(); 
			            OutputStream out = new BufferedOutputStream(new FileOutputStream(img)); 
			 
			            for (int b; (b = in.read()) != -1;) { 
			                out.write(b); 
			            } 
			            out.close(); 
			            in.close(); 
			        } catch (MalformedURLException e) { 
			            img = null;
			            return false; 
			        } catch (IOException e) { 
			            img = null;
			            return false; 
			        } 
			    } 
			    return true; 
			}

调用：

if(getImageByWeb2("processed_"+serverFileName)){
    //将保存完毕的图像，转变为Bitmap格式
    Bitmap resultForWebImage=FilesToBitmap(TEMP_WEB_IMAGE_PATH+"processed_"+serverFileName);
}

附属代码：

private static final String TEMP_WEB_IMAGE_PATH="/sdcard/app/tmp/";
Bitmap FilesToBitmap(String filename){
    	Bitmap temp=null;
    	if(filename!=null){
        	File imageFile = new File(filename);
            if (imageFile.exists())
            {
            	// Load the image from file
            	temp = BitmapFactory.decodeFile(filename);
            }
        	
    	}
    	return temp;
}

转载请声明：http://blog.csdn.net/nuptboyzhb/article/details/7983318