一、基本使用

1、創(chuàng)建Retrofit類

 Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BaseHttpUrl.BASE_URL)
                //使用網(wǎng)絡(luò)請求內(nèi)核，默認(rèn)就是okhttp?？梢栽O(shè)置okhttp相關(guān)內(nèi)容
                .client(new OkHttpClient())
                //轉(zhuǎn)換器，作用就是講response的數(shù)據(jù)進(jìn)行解碼
                .addConverterFactory(GsonConverterFactory.create())
                //添加異步適配器，默認(rèn)使用ExecutorCallbackCall()。
                // 默認(rèn)適配器實際上就是通過調(diào)用okhttp的call.enqueue()方法發(fā)起請求，并異步處理回調(diào)。
                // 也可以使用rxjava進(jìn)行處理。后續(xù)文章中我們在說rxjava的使用。
                //.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();

2、自定義OkHttpClient()

    // 1、創(chuàng)建http日志 攔截器
    HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {
        @Override
        public void log(String message) {
            Logger.e("okhttp",message);
        }
    });
    httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

    // 2、指定緩存路徑,緩存大小100Mb
    Cache cache = new Cache(new File(StoragePathConfig.getAppCacheDir(), "HttpCache"),
            1024 * 1024 * 100);
    // 3、創(chuàng)建OkHttpClient
    mOkHttpClient = new OkHttpClient.Builder()
            //添加緩存
            .cache(cache)
            //添加自定義Intercept，可以統(tǒng)一設(shè)置Request的通用Header頭
            .addInterceptor(new SignInterceptor())//添加簽名
            //添加http日志攔截器
            .addInterceptor(httpLoggingInterceptor)
            //默認(rèn)重試連接1次，如果需要多次重試。需要自定義intercept
            .retryOnConnectionFailure(true)
            //重試intercept ，最大重試10次
            .addInterceptor(new RetryInterceptor(10))
            //設(shè)置超時時間
            .connectTimeout(30, TimeUnit.SECONDS)
            .writeTimeout(30, TimeUnit.SECONDS)
            .readTimeout(30, TimeUnit.SECONDS)
            .build();
            
            
            

     /**
     * 自定義的，重試N次的攔截器
     * 通過：addInterceptor 設(shè)置
     */
    public static class RetryInterceptor implements Interceptor {
        public int maxRetry;//最大重試次數(shù)
        private int retryNum = 0;//假如設(shè)置為3次重試的話，則最大可能請求4次（默認(rèn)1次+3次重試）
        public RetryInterceptor(int maxRetry) {
            this.maxRetry = maxRetry;
        }
        @Override
        public Response intercept(@NonNull Chain chain) throws IOException {
            Request  request  = chain.request();
            Response response = chain.proceed(request);
            Log.i("Retry","num:"+retryNum);
            while (!response.isSuccessful() && retryNum < maxRetry) {
                retryNum++;
                Log.i("Retry","num:"+retryNum);
                response = chain.proceed(request);
            }
            return response;
        }
    }
    

3、創(chuàng)建請求接口interface

    public interface RetrofitApiImpl{
        @Headers({
                "Cache-Control: max-age=640000",
                "User-Agent: Retrofit-Sample-App"
        })
        @POST("audit/home/get-home")
        Call<TestVo>  getHome(@Body HashMap<String,String> map);

        //表單形式上傳
        @FormUrlEncoded
        @POST("loanmall/activity/get-list")
        Call<TestVo>  getHome1(@Field("first_name") String first,@Field("second_name") String second);

        //上傳文件類型
        @Multipart
        @PUT("common/image/post-upload")
        Call<TestVo>  updatePhoto(@Part("file\"; filename=hahaha\"") RequestBody photo,@Part("dir") String dir,@Part("rule") String rule);

        @POST("common/image/post-upload")
        Call<TestVo>  updatePhoto1(@Body MultipartBody multipartBody);

    }

4、發(fā)起請求

4.1 發(fā)起普通post

    //創(chuàng)建請求類
    RetrofitApiImpl retrofitApi = retrofit.create(RetrofitApiImpl.class);
    //調(diào)用接口
    Call<TestVo> call = retrofitApi.getHome(new HashMap<String, String>());
    //發(fā)起請求
    call.enqueue(new Callback<TestVo>() {
        @Override
        public void onResponse(Call<TestVo> call, Response<TestVo> response) {
            
        }

        @Override
        public void onFailure(Call<TestVo> call, Throwable t) {

        }
    });

4.2 發(fā)起file類型文件

    RetrofitApiImpl retrofitApi = retrofit.create(RetrofitApiImpl.class);
    //創(chuàng)建multpart類型
    MultipartBody.Builder builder = new MultipartBody.Builder();
    RequestBody requestBody = RequestBody.create(MediaType.parse("image/png"), file);
    builder.addFormDataPart("file", file.getName(), requestBody);
    builder.addFormDataPart("dir", "user");
    int width = AbDisplayUtil.dip2px(70);
    builder.addFormDataPart("rule", width+"x"+width+"_c");
    builder.setType(MultipartBody.FORM);
    MultipartBody multipartBody = builder.build();
    //發(fā)起請求
    Call<TestVo> call = retrofitApi.updatePhoto1(multipartBody);
    call.enqueue(new Callback<TestVo>() {
        @Override
        public void onResponse(Call<TestVo> call, Response<TestVo> response) {
            
        }

        @Override
        public void onFailure(Call<TestVo> call, Throwable t) {

        }
    });