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Interceptor
movieService = 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);