java - 无法将图片从Android上传到java服务器

Question

我一直在尝试通过 Android Retrofit + SpringMVC 实现个人资料照片上传功能。 Java 服务器无法响应 Retrofit API 调用。相关代码 fragment 如下:

API接口(interface)

@Multipart
@POST("user/profileImage")
Call<ResponseBody> uploadImage(@Part MultipartBody.Part image, @Part("name") RequestBody name);

上传到服务器

public void uploadToServer(){
    //Get retrofit client
    Retrofit retrofit = ApiClient.getClient();
    //Get API interface
    ApiInterface apiInterface = retrofit.create(ApiInterface.class);
    // Get image parts
    MultipartBody.Part imageParts = bitmapToMultipart(imageBitmap);
    //Get image name
    RequestBody name = RequestBody.create(MediaType.parse("text/plain"), "ProfileImage");
    //Call image upload API
    Call<ResponseBody> call = apiInterface.uploadImage(imageParts,name);
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
            ResponseBody body = response.body();
        }

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {
            t.printStackTrace();
        }
    });
}

位图转多部分

public MultipartBody.Part bitmapToMultipart(Bitmap imageBitmap){
    File file = null;
    try {
        //create a file to write bitmap data
        file = new File(this.getCacheDir(), "imageBitmap");
        file.createNewFile();

        //Convert bitmap to byte array
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        imageBitmap.compress(Bitmap.CompressFormat.JPEG, 0 /*ignored for PNG*/, bos);
        byte[] bitmapdata = bos.toByteArray();

        //write the bytes in file
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(bitmapdata);
        fos.flush();
        fos.close();
    }catch(IOException e){
        e.printStackTrace();
    }
    RequestBody reqFile = RequestBody.create(MediaType.parse("image/*"), file);
    MultipartBody.Part body = MultipartBody.Part.createFormData("upload", file.getName(), reqFile);

    return body;
}

Java SpringMVC Controller

@Controller
@RequestMapping("/user")
public class UserController{
    @RequestMapping(value = "/profileImage", method = RequestMethod.POST)
    public  @ResponseBody String imageUploader(@RequestParam("image") MultipartFile image, @RequestBody RequestBody name)throws Exception{
        return "";
    }
}

问题是: 请求甚至没有到达 java 服务器。

Answer 1

在您的 uploadToServer() 函数中，媒体类型应该是“multipart/form-data”，而不是字段名称的“text/plain”...

//Get image name
    RequestBody name = RequestBody.create(MediaType.parse("multipart/form-data"), "ProfileImage");

在您的 bitmapToMultipart() 函数中，媒体类型应该是“multipart/form-data”。 (“image/*”应该也可以，但如果不行，“multipart/form-data”肯定可以)

引用- How to Upload Image file in Retrofit 2

在你的 spring Controller 中，你应该使用 @RequestParam 代替 @Requestbody

@Controller
@RequestMapping("/user")
public class UserController{
    @RequestMapping(value = "/profileImage", method = RequestMethod.POST)
    public  @ResponseBody String imageUploader(@RequestParam("image") MultipartFile image, @RequestParam String name)throws Exception{
        return "";
    }
}