okHttp网络请求框架get请求的封装

public class MyOkhttp {    public static OkHttpClient client = new OkHttpClient();    public static String get(String url){        try {            client.newBuilder().connectTimeout(10000, TimeUnit.MILLISECONDS);            Request request = new Request.Builder().url(url).build();            Response response = client.newCall(request).execute();            if (response.isSuccessful()) {                return response.body().string();            } else {                throw new IOException("Unexpected code " + response);            }        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }}