How does retrofit post json to the server

http://www.jianshu.com/p/54bdb3faa469?utm_campaign=maleskine&utm_content=note&utm_medium=pc_all_hots&utm_source=recommendation

Requirement: When developing a new project, to get the interface document, the request message body needs to be json type

Maybe you wrote a post like this:

interface NService {
        @FormUrlEncoded
        @POST("alarmclock/add.json")
        Call<ResponseBody> getResult(@FieldMap Map<String, Object> params);
    }

Retrofit retrofit = new Retrofit.Builder().baseUrl(URL).client(client).build();
     NService nService = retrofit.create(NService.class);
     Map<String, Object> params = new HashMap<>();///
     params.put("id", "123");
     params.put("name", "ksi");//

     Call<ResponseBody> call = nService.getResult(params); //
     call.enqueue(new Callback<ResponseBody>() {
         @Override
         public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {

         }

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

         }
     });

This is a form submission, and what you submit is actually id=123&name=ksisuch a thing.
If you want to submit json, then it is natural to change the request body

Well, some students may search for the following questions: How to view/change/add request headers, request bodies, and response bodies ?
My version is: retrofit2.1.0, the practice before 2.0 may be different.

First, rely on this thing under your build.gradle
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
and then configure the client, add interceptors, the first interceptor is used to add request headers, and the second is to print logs

OkHttpClient client = new OkHttpClient().newBuilder()
                .addInterceptor(new Interceptor() {
                    @Override
                    public Response intercept(Chain chain) throws IOException {
                        Request request = chain.request().newBuilder()
                                .addHeader("creater_oid", "123411") //这里就是添加一个请求头
                                .build();

//                        Buffer buffer = new Buffer();       不依赖logging，用这三行也能打印出请求体
//                        request.body().writeTo(buffer);
//                        Log.d(getClass().getSimpleName(), "intercept: " + buffer.readUtf8());

                        return chain.proceed(request);
                    } //下面是关键代码
                }).addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
                .build();

Okay, let's get down to business, the request in json format, the parameter annotation is @Body

interface ApiService {
        @POST("add.json")
        Call<ResponseBody> add(@Body RequestBody body);
    }

Retrofit retrofit = new Retrofit.Builder().baseUrl(URL).client(client).build();
        ApiService apiService = retrofit.create(ApiService.class);

//new JSONObject里的getMap()方法就是返回一个map，里面包含了你要传给服务器的各个键值对，然后根据接口文档的请求格式，直接拼接上相应的东西就行了
//比如{"data":{这里面是参数}}，那就在外面拼上大括号和"data"好了
        RequestBody requestBody = RequestBody.create(MediaType.parse("Content-Type, application/json"),
                                   "{\"data\":"+new JSONObject(getMap()).toString()+"}");
        Call<ResponseBody> call = apiService.add(requestBody);
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
                Log.d(getClass().getSimpleName(), "onResponse: ----" + response.body().string());
            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {
                Log.d(getClass().getSimpleName(), "onFailure: ------" + t.toString());
            }
        });

OK, you're done, let's take a look at the print result

QQ screenshot 20160722012756.png

See the third line, that is the custom added request header, and the fourth line is the request body in json format
<---200 OK The following is the response body.

Author: futaba_anzu
Link: http://www.jianshu.com/p/95a7361016ff
Source: Jianshu The
copyright belongs to the author. For commercial reprints, please contact the author for authorization, and for non-commercial reprints, please indicate the source.

How does retrofit post json to the server

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