Android网络操作（上传下载等）(2)

        } finally { 
            //httpPost.abort(); 
        } 
        return retrieveHttpEntity(httpEntity); 
    } 
 
    public static InputStream download(URL url) throws IOException { 
        URLConnection conn = url.openConnection(); 
        InputStream is = conn.getInputStream(); 
        return is; 
    } 
 
    public static byte[] downloadFileData(String surl) throws IOException { 
        URL url = new URL(surl); 
        URLConnection conn = url.openConnection(); 
        // 获取长度 
        int length = (int) conn.getContentLength(); 
        InputStream is = conn.getInputStream(); 
        byte[] imgData = null; 
        if (length != -1) { 
            imgData = new byte[length]; 
            byte[] temp = new byte[512]; 
            int readLen = 0; 
            int destPos = 0; 
            while ((readLen = is.read(temp)) > 0) { 
                System.arraycopy(temp, 0, imgData, destPos, readLen); 
                destPos += readLen; 
            } 
        } 
        return imgData; 
    } 
 
    public static InputStream download(String url) throws IOException { 
        return download(new URL(url)); 
    } 
 
    public static String httpPost(String url) throws ClientProtocolException, IOException { 
        return httpPost(url, new ArrayList<NameValuePair>()); 
    }