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;    }}