无法在安卓中使用OkHttp3将JSON发布到server Express js

dependencies {
    implementation 'com.squareup.okhttp3:okhttp:版本号'
}

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json; charset=utf-8");
String json = "{\"key\":\"value\"}"; // 替换为你要发送的JSON数据

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

Request request = new Request.Builder()
        .url("服务器URL") // 替换为你的服务器URL
        .post(requestBody)
        .build();

try {
    Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        // 请求成功
        String responseBody = response.body().string();
        // 处理响应数据
    } else {
        // 请求失败
        // 处理错误情况
    }
} catch (IOException e) {
    e.printStackTrace();
    // 处理异常情况
}