服务器：

    public String uploadInfo() throws IOException{
        
        System.out.println(username + "," +password);
        
        if(mPhoto == null){
            System.out.println(mPhotoFileName + "is null .");
        }

        String dir = ServletActionContext.getServletContext().getRealPath("files");
        
        File file = new File(dir,mPhotoFileName);
        
        FileUtils.copyFile(mPhoto,file);//上传文件
        
        return null;
    }

ERROR org.apache.struts2.dispatcher.Dispatcher - Could not find action or result
/imooc_okhttp/uploadInfo

客户端：

    public void doUpload(View view) throws IOException {
    
        File file = new File(Environment.getExternalStorageDirectory(),"temp.jpg");
        if (!file.exists()){
            L.e(file.getAbsolutePath()+"not exist!");
            return;
        }
         RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("username","hyman")
                .addFormDataPart("password","1234")
                .addFormDataPart("mPhoto","temp.jpg",RequestBody.create(MediaType.parse("application/octet-stream"),file))
                .build();
        Request request = new Request.Builder()
                .url(BaseUrl+"uploadInfo")
                .post(requestBody)
                .build();
                
        executeRequest(request);
    }

点击按钮之后是html的文档