okhttp发送post请求

String url = "http://www.xxx.com/api/test";

OkHttpClient httpClient = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json;charset=UTF-8");

String post = "{\"test\":123}";

RequestBody requestBody = RequestBody.create(mediaType, post);

Request request = new Request.Builder()
        .post(requestBody)
        .url(url)
        .build();

Response response = httpClient.newCall(request).execute();