HTTP传输byte[ ] 两种方式

//========第一种========
public class HttpUtil {
    public static InputStream http(String url, byte[] PostData) {
        URL u = null;
        HttpURLConnection con = null;
        InputStream inputStream = null;
        //尝试发送请求
        try {
            u = new URL(url);
            con = (HttpURLConnection) u.openConnection();
            con.setRequestMethod(“POST”);
            con.setDoOutput(true);
            con.setDoInput(true);
            con.setUseCaches(false);
            con.setRequestProperty(“Content-Type”, “binary/octet-stream”);
            OutputStream outStream = con.getOutputStream();
            outStream.write(PostData);
            outStream.flush();
            outStream.close();
            //读取返回内容
            inputStream = con.getInputStream();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (con != null) {
            con.disconnect();
        }
        return inputStream;
    }
}
//==========第二种============
public String postUrlByByteArray(Context context, byte[] paramArrayOfByte, String url, String httpPostId) {
    String result = "";
    HttpPost httpPost = new HttpPost(url);
    try {
    ByteArrayEntity arrayEntity = new ByteArrayEntity(paramArrayOfByte);
    arrayEntity.setContentType("application/octet-stream");
    httpPost.setEntity(arrayEntity);
    HttpEntity tempEntity = httpPost.getEntity();
    InputStream is = tempEntity.getContent();
    StringBuffer out = new StringBuffer();
    byte[] b = new byte[4096];
    int n;
    while ((n = is.read(b)) != -1) {
        out.append(new String(b, 0, n));
    }
    String param = out.toString();
    System.out.println(param);
    HttpParams httpParameters = new BasicHttpParams();
    HttpConnectionParams.setConnectionTimeout(httpParameters, TIME_OUT);
    HttpConnectionParams.setSoTimeout(httpParameters, TIME_OUT);
    if (isMobileActive(context)) {
        HttpHost proxy = getHttpProxy(context);
    if (proxy != null)
        httpParameters.setIntParameter(proxy.getHostName(), proxy.getPort());
        }
    DefaultHttpClient client = new DefaultHttpClient(httpParameters);
    HttpResponse response = client.execute(httpPost);
    int res = response.getStatusLine().getStatusCode();
    if (res == 200) {
        result = EntityUtils.toString(response.getEntity());
    }
    } catch (Exception e) {
    return " Fail to establish http connection!" + e.getMessage();
    } finally {
        stopHttpPost(httpPostId);
    httpPost = null;
    }
    return result;
}