Retorfit+RxJava--单文件上传、多文件+文字一起传、form-data表单提交

一、引入依赖

compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.retrofit2:converter-gson:2.3.0'
compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.8.0'
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'

二、单文件上传

网上有好多例子，不多说了，主要是两个part参数，直接上代码：

1、接口的声明：

    /**
     * 单个文件上传
     * @param url
     * @param description
     * @param file
     * @return
     */
    @Multipart
    @POST()
    Call uploadFile(@Url String url,
                                @Part("description") RequestBody description,
                                @Part MultipartBody.Part file);

接口的调用：

    /**
     * 文件上传
     *
     * @param filePath 上传文件的路径
     */
    public void fileUpload(String filePath) {
        if (!NetworkState.isNetworkAvailable(MyApplication.getMyApplication())) {
            return;
        }
        //构建要上传的文件
        File file = new File(filePath);
        RequestBody requestFile = RequestBody.create(MediaType.parse("application/otcet-stream"), file);
        MultipartBody.Part body = MultipartBody.Part.createFormData("aFile", file.getName(), requestFile);
        String descriptionString = "This is a file description";
        RequestBody description = RequestBody.create(MediaType.parse("multipart/form-data"), descriptionString);
        SettingsInfo info = DataManager.getInstance().getSettingsInfo();
        String url = "http://" + Const.SERVER_ADDR + "/n/as/grapher_upload_file";
        Call call = ServiceGenerator.createService(FileUploadClient.class).uploadFile(url, description, body);
        call.enqueue(new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
                Log.d("lixm", "fileUpload() , httpResult = " + httpResult);
            }

            @Override
            public void onFailure(Call call, Throwable t) {
                Log.d("lixm", "fileUpload(), onFailure, error = " + t.getMessage());
            }
        });
    }

三、多文件+文字一起上传

1、接口的声明

    /**
     * 使用@Multipart注解方法，并用@Part注解方法参数，类型是List
     * @param url
     * @return
     */
    @Multipart
    @POST()
    Observable uploadFiles4MultiBodyPars(@Url String url,@Part() List parts);

2、调用方法

/**
     * 多文件上传
     *
     * @param files      上传文件的集合
     * @param fileUploadParam 上传的信息
     */
    public void multiFileUpload(List files, FileUploadParam fileUploadParam, Observer fileUploadbserver) {
        if (!NetworkState.isNetworkAvailable(MyApplication.getMyApplication())) {
            return;
        }
        SettingsInfo info = DataManager.getInstance().getSettingsInfo();
        String url = "http://" + info.libServerAddr + "/n/as/grapher_upload_file";
        List.Part> parts = FileUploadUtils.filesToMultipartBodyParts(files,fileUploadParam);

        FileUploadClient client = ServiceGenerator.createService(FileUploadClient.class);
        Observable observable = client.uploadFiles4MultiBodyPars(url, parts);
        observable.subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(fileUploadbserver);
    }

   public static List.Part> filesToMultipartBodyParts(List files,FileUploadParam fileUploadParam) {
        // 上传图片信息
        List.Part> parts = new ArrayList<>(files.size());
        for (int i = 0; i < files.size() ; i ++) {
            RequestBody requestBody = RequestBody.create(MediaType.parse("image/png"), files.get(i));
            MultipartBody.Part part = MultipartBody.Part.createFormData("file"+ i, files.get(i).getName(), requestBody);
            parts.add(part);
        }

        // 上传文字信息
        if(fileUploadParam != null){
            MultipartBody.Part equipmentId = MultipartBody.Part.createFormData("equipmentId", fileUploadParam.equipmentId);
            parts.add(equipmentId);

            MultipartBody.Part acceptanceId = MultipartBody.Part.createFormData("acceptanceId", fileUploadParam.acceptanceId);
            parts.add(acceptanceId);

            MultipartBody.Part fileName = MultipartBody.Part.createFormData("fileName", fileUploadParam.fileName);
            parts.add(fileName);

            MultipartBody.Part uploadPerson = MultipartBody.Part.createFormData("uploadPerson", fileUploadParam.uploadPerson);
            parts.add(uploadPerson);

            MultipartBody.Part timestamp = MultipartBody.Part.createFormData("timestamp", fileUploadParam.timestamp);
            parts.add(timestamp);

            String strMd5 = MD5Util.getMD5(fileUploadParam.equipmentId + fileUploadParam.timestamp + Const.KEY_MD5);
            MultipartBody.Part secStr = MultipartBody.Part.createFormData("secStr", strMd5);
            parts.add(secStr);
        }
        return parts;
    }

public class ServiceGenerator {
    private static final String BASE_URL = "https://api.github.com/";
    private static Retrofit retrofit;

    // 1 创建Retrofit.Builder
    private static Retrofit.Builder builder
            = new Retrofit.Builder().baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                //.addConverterFactory(new FileRequestBodyConverterFactory())  // 支持文件上传时内容的转换
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create());  // 支持RxJava;

    // 2 创建OkHttpClient
    private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

    // 日志拦截器
    private static HttpLoggingInterceptor logging = new HttpLoggingInterceptor()
                    .setLevel(HttpLoggingInterceptor.Level.BODY);
    // test
    private static LogInterceptor logInterceptor = new LogInterceptor();

    // 3 创建service_client

    public static  S createService(Class serviceClass) {
        if (!httpClient.interceptors().contains(logInterceptor)) {
            httpClient.addInterceptor(logInterceptor);
            builder.client(httpClient.build());
            retrofit = builder.build();
        }

        return retrofit.create(serviceClass);
    }
}

四、form-data表单提交

@FormUrlEncoded()
@POST()
Call uploadVideoInfoByAddBatch(@Url String url,
                                           @FieldMap Map requestMap);

注意：@FormUrlEncoded()要和@FieldMap配合使用，否则的话会报错。