Java-9-简单的OKHttp使用

这种请求方式看起来还不错，精简：

OkHttpClient client = new OkHttpClient();    // 设置数据类型        MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");    // 传参        RequestBody body = RequestBody.create(mediaType, "message=测试okhttp");        Request request = new Request.Builder()                .url("http://ip:port/pay/thirdPayNotify.do")                .post(body)// post方式                .addHeader("content-type", "application/x-www-form-urlencoded")                .addHeader("cache-control", "no-cache")                .addHeader("postman-token", "4fdcee09-89d5-a6e5-7b01-72d1dddd712b")                .build();        try {                // 执行请求            Response response = client.newCall(request).execute();            System.out.println(response.body().toString()) ;        } catch (IOException e) {            e.printStackTrace();        }        response.body().string()