有没有办法使用Retrofit 2为每个请求添加查询参数？

Question

我需要为Retrofit 2.0.0-beta2库的每个请求添加一个查询参数.我找到了Retrofit 1.9的这个解决方案,但是如何添加RequestInterceptor最新的库版本？

我的界面:

@GET("user/{id}")
Call<User> getUser(@Path("id")long id);

@GET("users/")
Call<List<User>> getUser();

客户:

Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .client(CLIENT)  // custom OkHTTP Client
                    .build();
service = retrofit.create(userService.class);

Answer 1

为了完整起见,以下是使用OkHttp-Interceptor为每个Retrofit 2.x请求添加参数所需的完整代码:

OkHttpClient client = new OkHttpClient();

client.interceptors().add(new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        HttpUrl url = request.url().newBuilder().addQueryParameter("name","value").build();
        request = request.newBuilder().url(url).build();
        return chain.proceed(request);
    }
});

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("...")
        .client(client)
        .build();

Answer 2

在 kotlin 中，将以下拦截器添加到您在 Retrofit builder 中设置的 OkHttpClient 中：

Retrofit.Builder()
    .baseUrl("...")
    .client(
        OkHttpClient.Builder()
            .addInterceptor { chain ->
                val url = chain
                    .request()
                    .url()
                    .newBuilder()
                    .addQueryParameter("key", "value")
                    .build()
                chain.proceed(chain.request().newBuilder().url(url).build())
            }
            .build()
    )
    .build()
    .create(FooService::class.java)

当然，将 OkHttpClient 构建提取到 val 或注入依赖项中将使其更加模块化和易于理解。

Answer 3

现在Retrofit发布了2.0.0,这是我的解决方案:

OkHttpClient client = new OkHttpClient.Builder()
        .addInterceptor(new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {

                String uid = "0";
                long timestamp = (int) (Calendar.getInstance().getTimeInMillis() / 1000);
                String signature = MD5Util.crypt(timestamp + "" + uid + MD5_SIGN);
                String base64encode = signature + ":" + timestamp + ":" + uid;
                base64encode = Base64.encodeToString(base64encode.getBytes(), Base64.NO_WRAP | Base64.URL_SAFE);

                Request request = chain.request();
                HttpUrl url = request.url()
                        .newBuilder()
                        .addQueryParameter("pageSize", "2")
                        .addQueryParameter("method", "getAliasList")
                        .build();

                request = request
                        .newBuilder()
                        .addHeader("Authorization", "zui " + base64encode)
                        .addHeader("from_client", "ZuiDeer")
                        .url(url)
                        .build();

                Response response = chain.proceed(request);
                return response;
            }
        }).build();


Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(ApiConstants.API_BASE_URL)
        .client(client)
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .build();

mRestfulService = retrofit.create(RestfulService.class);

Answer 4

In3.2.0及更高版本，您应该使用addInterceptor()inOkHttpClient.Builder代替。

例如，使用Retrolambda：

HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor()
        .setLevel(HttpLoggingInterceptor.Level.BASIC);

Interceptor clientInterceptor = chain -> {
    Request request = chain.request();
    HttpUrl url = request.url().newBuilder().addQueryParameter("name", "value").build();
    request = request.newBuilder().url(url).build();
    return chain.proceed(request);
};

OkHttpClient client = new OkHttpClient.Builder()
        .addNetworkInterceptor(clientInterceptor)
        .addInterceptor(loggingInterceptor)
        .build();

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .client(client)
        .build();