基于标准http实现Android多文件上传

/**
 * 
 * 同步上传多个文件
 * 基于标准的http实现，需要在非UI线程中调用，以免阻塞UI。
 *
 */
public class MyUploader {
 private static final String TAG = "MyUploader";

 // ////////////////////同步上传多个文件/////////
  /**
   * 同步上传File
   * 
   * @param Url
   * @param fullFileName
   *   : 全路径，ex. /sdcard/f/yh.jpg
   * @param fileName
   *   : file name, ex. yh.jpg
   * @return 服务器的响应结果(字符串形式)
   */
  public String MyUploadMultiFileSync(String Url,
    List fileList, Map params) {
   String reulstCode = "";
   String end = "\r\n";
   String twoHyphens = "--";
   String boundary = "--------boundary";

   try {
    URL url = new URL(actionUrl);
    HttpURLConnection con = (HttpURLConnection) url.openConnection();
    // 允许Input、Output，不使用Cache
    con.setDoInput(true);
    con.setDoOutput(true);
    con.setUseCaches(false);
    // 设置传送的method=POST
    con.setRequestMethod("POST");
    // setRequestProperty
    con.setRequestProperty("Connection", "Keep-Alive");
    con.setRequestProperty("Charset", "UTF-8");
    // con.setRequestProperty("Content-Type",
    // "application/x-www-form-urlencoded");
    con.setRequestProperty("Content-Type",
      "multipart/form-data;boundary=" + boundary);

    StringBuffer s = new StringBuffer();
    // 设置DataOutputStream
    DataOutputStream dos = new DataOutputStream(con.getOutputStream());

    for (int i = 0; i 

public void uploadThreadTest() {
  new Thread(new Runnable() {
   @Override
   public void run() {

    try {
     upload();
    } catch (Exception e) {
     e.printStackTrace();
    }
   }

  }).start();

 }

 private void upload() {
  String url = "https://httpbin.org/post";
  List fileList = getCacheFiles();

  if (fileList == null) {
   myHandler.sendEmptyMessage(-1);
  }else {
   MyUploader myUpload = new MyUploader();
   //同步请求，直接返回结果，根据结果来判断是否成功。
   String reulstCode = myUpload.MyUploadMultiFileSync(url, fileList, null);
   Log.i(TAG, "upload reulstCode: " + reulstCode);
   myHandler.sendEmptyMessage(0);

  }
 }

 private List getCacheFiles() {
  List fileList = new ArrayList();
  File catchPath = mContext.getCacheDir();

  if (catchPath!=null && catchPath.isDirectory()) {

   File[] files = catchPath.listFiles();
   if (files == null || files.length<1) {
    return null;
   }
   for (int i = 0; i