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;
}
}