Android Retrofit2 Post请求添加Json类型参数笔记

Android Retrofit2 Post请求添加Json类型参数笔记

一.添加Header

1.添加单独Header

对于某个API所需要添加Header时，可以直接在Service接口上添加@Headers注解：

@Headers({            "Content-Type: application/json;charset=UTF-8",            "User-Agent: Retrofit-your-App"})@GET(ConstantsApi.douban_in_theaters)Observable<MovieTheatersModel> requestTheatersMovies(@Query("city")String city,                                                         @Query("count")Integer count,                                                         @Query("start")Integer start);

2.添加共同Header

如上，我们可以发现，大部分API「”Content-Type: application/json;charset=UTF-8”」都是Header中必须的，那么我们可以直接添加在拦截器中：

new Retrofit.Builder()           .addConverterFactory(GsonConverterFactory.create())           .client(new OkHttpClient.Builder()                   .addInterceptor(new Interceptor() {                       @Override                       public Response intercept(Chain chain) throws IOException {                           Request request = chain.request()                                   .newBuilder()                                   .addHeader("Content-Type", "application/json;charset=UTF-8")                                   .addHeader("header2", "123456")                                   .addHeader("header3", "123456")                                   .addHeader("header4", "123456")                                   .build();                           return chain.proceed(request);                       }                   }).build();

然后你说直接这样每次都add一个匿名的intercept,令人头大的缩进，也太不软件工程了，那就直接封装一个：

public class MyInterceptor implements Interceptor {    @Override    public Response intercept(Chain chain) throws IOException {        Request request = chain.request()                .newBuilder()                .addHeader("Content-Type", "application/json;charset=UTF-8")                .addHeader("header2", "123456")                .addHeader("header3", "123456")                .addHeader("header4", "123456")                .build();        return chain.proceed(request);    }}

每次请求需要这些header的时候只需要：

HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);MyInterceptor myInterceptor = new MyInterceptor();OkHttpClient client = new OkHttpClient()        .newBuilder()        .addInterceptor(httpLoggingInterceptor)        .addInterceptor(myInterceptor)        .build();//添加自定义InterceptormovieService = new Retrofit.Builder()   //配合Retrofit          .baseUrl(ConstantsApi.BASE_DOUBAN)          .addConverterFactory(GsonConverterFactory.create())          .addCallAdapterFactory(RxJavaCallAdapterFactory.create())          .client(client)          .build()          .create(DoubanMovieService.class);

二.添加Json类型Body

假定需求Json格式如下：

{    "param1": "111",    "param2": "222",    "data": {        "param3": "string",        "param4": "string2"    }}

1.创建JsonObject对象

 JSONObject root = new JSONObject(); JSONObject requestData = new JSONObject(); try {     requestData.put("param3", "string");     requestData.put("param4", "string2");     root.put("param1", "111");     root.put("param2", "222");     root.put("data", requestData); } catch (JSONException e) {     e.printStackTrace(); }

2.API 接口设置

@POST("api/data?")Observable<PromotionModel> getResult(@Body RequestBody requestBody);

3.联网请求（包含上述1中代码）

JSONObject root = new JSONObject();JSONObject requestData = new JSONObject();try {    requestData.put("param3", "string");    requestData.put("param4", "string2");    root.put("param1", "111");    root.put("param2", "222");    root.put("data", requestData);} catch (JSONException e) {    e.printStackTrace();}RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),root.toString());OkHttpClient client = new OkHttpClient.Builder()        .addInterceptor(new Interceptor())        .addInterceptor(logging)        .build();service = new Retrofit.Builder()        .client(client)        .baseUrl(Constants.BASE_URL)        .addConverterFactory(GsonConverterFactory.create())        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())        .build()        .create(Service.class);return service.getResult(requestBody);