android传输图片数据给java后台（HTML）原始封装

@GetMapping(value="/upload")
public  String uploadFile()
{
    String actionUrl = "http://IP/plugins/ueditor/jsp/uploader.jsp?action=uploaduser&dirName=headimg&needCompress=true";
    String picPath = "C:\\Users\\Administrator\\Desktop\\图片\\7aa012c0b29921a6.jpg";
    String end ="\r\n";
    String twoHyphens ="--";
    String boundary ="*****";//边界标识
    try
    {
        URL url =new URL(actionUrl);
        HttpURLConnection con=(HttpURLConnection)url.openConnection();
    /* 允许Input、Output，不使用Cache */
        con.setDoInput(true);//允许输入流
        con.setDoOutput(true);//允许输出流
        con.setUseCaches(false);//不允许使用缓存
    /* 设置传送的method=POST */
        con.setRequestMethod("POST");
    /* setRequestProperty   设置编码  */
        con.setRequestProperty("Connection", "Keep-Alive");
        con.setRequestProperty("Charset", "UTF-8");
        con.setRequestProperty("Content-Type",// "multipart/form-data"这个参数来说明我们这传的是文件不是字符串了
                "multipart/form-data;boundary="+boundary);
    /* 设置DataOutputStream */
        DataOutputStream ds =
                new DataOutputStream(con.getOutputStream());
        ds.writeBytes(twoHyphens + boundary + end);
        ds.writeBytes("Content-Disposition: form-data; "+
                "name=\"file1\";filename=\""+
                "ceshi" +"\""+ end);
        ds.writeBytes(end);
    /* 取得文件的FileInputStream */
        FileInputStream fStream =new FileInputStream(picPath);
    /* 设置每次写入1024bytes */
        int bufferSize =1024;
        byte[] buffer =new byte[bufferSize];
        int length =-1;
    /* 从文件读取数据至缓冲区 */
        while((length = fStream.read(buffer)) !=-1)
        {
      /* 将资料写入DataOutputStream中 */
            ds.write(buffer, 0, length);
        }
        ds.writeBytes(end);
        ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
    /* close streams */
        fStream.close();
        ds.flush();
    /* 取得Response内容 */
        InputStream is = con.getInputStream();
        int ch;
        StringBuffer b =new StringBuffer();
        while( ( ch = is.read() ) !=-1 )
        {
            b.append( (char)ch );
        }
    /* 将Response显示于Dialog */
        //  showDialog("上传成功"+b.toString().trim());
    /* 关闭DataOutputStream */
        ds.close();
        //返回客户端返回的信息
        return b.toString().trim();
    }
    catch(Exception e)
    {
        //showDialog("上传失败"+e);
        return null;
    }
}