Okhttp post return null

Question

我在执行时打印了json，然后复制了它，我在邮递员中尝试了相同的json和url，并且它可以正常工作，所以我不认为问题出在url或json。 main中的rs变量始终为null

public class PostLocation {

public static final MediaType JSON = MediaType.get("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();

public String post(String url, String json) throws IOException {

    RequestBody body = RequestBody.create(json, JSON);
    Request request = new Request.Builder()
            .url(url)
            .post(body)
            .build();


    Response response = null;
    try {

        response = client.newCall(request).execute();  return response.body().string();
    } finally {
        if (response != null) { response.close(); }
    }

}

String bowlingJson(Double lg,Double lt) {
    return "{\"id\": null,\"datetime\": \"2019-01-10T19:00:00.000+0000\",\"user\": {\"id\": 1 },\"latitude\": "+lt+",\"longitude\": "+lg+"}";
}

}

main：

            String rs = null;
            String json = null;
            //post
            try{
                StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
                StrictMode.setThreadPolicy(policy);

                PostLocation pl = new PostLocation();
                json = pl.bowlingJson(location.getLongitude(), location.getLatitude());
                System.out.println(json);
                rs = pl.post("http://localhost:8080/api/v1/locations", json);
            }catch (IOException EX){
            }finally {
                t.setText("\n " + location.getLongitude() + " " + location.getLatitude() );
            }

Answer 1

这是您格式化的Json：

{ 
 "id":null,
 "datetime":"2019-01-10T19:00:00.000+0000",
 "user":{ 
  "id":1
 },
 "latitude":"+lt+",
 "longitude":"+lg+"
}

在我看来，lt和lg总是在其周围带有+。

为什么不使用String.format：

String.format("{\"id\": null,\"datetime\": \"2019-01-10T19:00:00.000+0000\",\"user\": {\"id\": 1 },\"latitude\": %f,\"longitude\": %f}", lt, lg);

Answer 2

问题是java.net.ConnectException：我用10.0.2.2更改了localhost（127.0.0.1），因为Android模拟器在虚拟机中运行

然后我遇到一个问题java.net.SocketTimeoutException：timeout我加了：

    OkHttpClient.Builder builder = new OkHttpClient.Builder();
    builder.connectTimeout(5, TimeUnit.MINUTES) // connect timeout
            .writeTimeout(5, TimeUnit.MINUTES) // write timeout
            .readTimeout(5, TimeUnit.MINUTES); // read timeout

    client = builder.build();

现在正在工作