如何在使用Retrofit调用API时传入body中的原始数据

public interface ApiService {
    @POST("api/endpoint")
    Call<ResponseBody> sendData(@Body RequestBody requestBody);
}

OkHttpClient client = new OkHttpClient.Builder()
        .connectTimeout(30, TimeUnit.SECONDS)
        .addInterceptor(new LoggingInterceptor())
        .build();

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("https://api.example.com/")
        .client(client)
        .build();

ApiService apiService = retrofit.create(ApiService.class);

MediaType mediaType = MediaType.parse("application/json; charset=utf-8");
RequestBody requestBody = RequestBody.create(mediaType, "{\"key\":\"value\"}");

Call<ResponseBody> call = apiService.sendData(requestBody);

call.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
        if (response.isSuccessful()) {
            // 处理成功响应
        } else {
            // 处理错误响应
        }
    }

    @Override
    public void onFailure(Call<ResponseBody> call, Throwable t) {
        // 处理请求失败
    }
});