OkHttpClient网络请求

import java.util.Map;import okhttp3.Callback;import okhttp3.FormBody;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.logging.HttpLoggingInterceptor;/** * Created by user on 2017/11/8. * 网络请求工具类 * 1.先导入OkHttpClient的jar包，然后导入com.squareup.okhttp3:logging-interceptor拦截器的包 * 2.完善HttpUtil的工具类（1）.getHttpUtil双层判断 *                      （2）.HttpUtil,创建OkHttpClient */public class HttpUtil {    private static HttpUtil httpUtil;    private final OkHttpClient client;    private HttpUtil() {        //创建拦截器        HttpLoggingInterceptor logging = new HttpLoggingInterceptor();        logging.setLevel(HttpLoggingInterceptor.Level.BODY);        //创建OkHttp        client = new OkHttpClient.Builder()                .addInterceptor(logging)                .build();    }    public static HttpUtil getHttpUtil() {        if (httpUtil == null) {            synchronized (HttpUtil.class) {                if (httpUtil == null) {                    httpUtil = new HttpUtil();                }            }        }        return httpUtil;    }    /**     * GET请求     *     * @param url      请求地址     * @param callback 回调     */    public void doGet(String url, Callback callback) {        Request request = new Request.Builder().url(url).build();        client.newCall(request).enqueue(callback);    }    /**     * post请求     *     * @param url      请求地址     * @param params   请求参数     * @param callback 回调     */    public void doPost(String url, Map<String, String> params, Callback callback) {        //这里可以加网络判断        /*//判断参数        if (params == null || params.size() ==0){            //运行时异常            throw new RuntimeException("params is null！！！");        }*/        //创建Request        FormBody.Builder builder = new FormBody.Builder();        for (Map.Entry<String,String> entry : params.entrySet()) {            builder.add(entry.getKey(),entry.getValue());        }        FormBody formBody = builder.build();        Request request = new Request.Builder()                .url(url)                .post(formBody)                .build();        client.newCall(request).enqueue(callback);    }}

//OnNetListener

public interface OnNetListener<T> {    //成功回调    public void onSuccess(T t);    //失败回调    public void onFailure(Exception e);}