Android - HTTP util class SyncGET & SyncPOST

1. gradle module 文件添加：

compile 'com.squareup.okhttp3:okhttp:3.9.1'

1. 实现工具类

public class UtilHttp {
    private static final String TAG = "UtilHttp";
    public static String err;

    public static String okPostUrlEncoded(String url,RequestBody body) {

        // sample of building body
        //RequestBody formBody = new FormBody.Builder().add("search", "Jurassic Park").build();
        try{
            final MediaType URLENCODED
                    = MediaType.parse("application/x-www-form-urlencoded; charset=utf-8");

            OkHttpClient client = new OkHttpClient();

            Request request = new Request.Builder()
                    .url(url)
                    .post(body)
                    .build();
            Response response = client.newCall(request).execute();

            String ret = response.body().string();

            return ret;
        }
        catch (IOException ex){
            Log.v("UtilHTTP->IOException",ex.getMessage());
            return "";
        }
        catch (Exception ex){
            Log.v("UtilHTTP-Exception",ex.getMessage());
            return "";
        }
    }

    public static String okPostJson(String url,String json)  {
        try{
            final MediaType JSON
                    = MediaType.parse("application/json; charset=utf-8");

            OkHttpClient client = new OkHttpClient();

            RequestBody body = RequestBody.create(JSON, json);
            Request request = new Request.Builder()
                    .url(url)
                    .post(body)
                    .build();
            Response response = client.newCall(request).execute();
            String ret = response.body().string();
            return ret;
        }
        catch (IOException ex){
            Log.v("UtilHTTP->IOException",ex.getMessage());
            return "";
        }
    }

    public static String okGet(String url){
        try{
            OkHttpClient client = new OkHttpClient();

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

            Response response = client.newCall(request).execute();
            String ret = response.body().string();
            return ret;
        }
        catch (IOException ex){
            Log.v("UtilHTTP->IOException",ex.getMessage());
            return "";
        }

    }
}