http://blog.csdn.net/lmj623565791/article/details/47911083
参照了鸿洋_大神的代码重写了自己需要的方法

    public final static int CONNECT_TIMEOUT = 60;
public final static int READ_TIMEOUT = 100;
public final static int WRITE_TIMEOUT = 60;

private static final OkHttpClient client = new OkHttpClient();
//private static final Handler handler = new Handler();
public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
private static Handler handler = new Handler();
static {
    client.newBuilder().readTimeout(READ_TIMEOUT, TimeUnit.SECONDS); // 读取超时
    client.newBuilder().writeTimeout(WRITE_TIMEOUT, TimeUnit.SECONDS); // 写入超时
    client.newBuilder().connectTimeout(CONNECT_TIMEOUT, TimeUnit.SECONDS); // 连接超时
}

/**
 * 同步get
 *
 * @param address
 * @return
 * @throws IOException
 */
public static String syncGet(String address) throws IOException {
    Request request = new Request.Builder()
            .get()
            .url(address)
            .build();
    Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        return response.body().string();
    } else {
        throw new IOException("Unexpected code " + response);
    }
}

/**
 * 同步post
 *
 * @param address
 * @param jsonStr
 * @return
 * @throws IOException
 */
public static String syncPost(String address, String jsonStr) throws IOException {
    RequestBody body = RequestBody.create(JSON, jsonStr);
    Request request = new Request.Builder()
            .post(body)
            .url(address)
            .build();
    Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        return response.body().string();
    } else {
        throw new IOException("Unexpected code " + response);
    }
}

/**
 * 异步get
 *
 * @param address
 * @param callback
 */
public static void asynGet(String address,  Callback callback) {
    Request request = new Request.Builder()
            .get()
            .url(address)
            .build();
    client.newCall(request).enqueue(callback);
}

/**
 * 异步post
 *
 * @param address
 * @param jsonStr
 * @param callback
 */
public static void asynPost(String address, String jsonStr, Callback callback) {
    RequestBody body = RequestBody.create(JSON, jsonStr);
    Request request = new Request.Builder()
            .post(body)
            .url(address)
            .build();
    client.newCall(request).enqueue(callback);
}


/**
 * 异步get 可以访问主线程
 * @param address
 * @param callback
 */
public static void asynGet(String address, OkhttpUtil.ResultCallback callback) {
    Request request = new Request.Builder()
            .get()
            .url(address)
            .build();
    deliveryResult(request, callback);
}

/**
 * 异步post 可以访问主线程
 * @param address
 * @param jsonStr
 * @param callback
 */
public static void asynPost(String address, String jsonStr, ResultCallback callback) {
    RequestBody body = RequestBody.create(JSON, jsonStr);
    Request request = new Request.Builder()
            .post(body)
            .url(address)
            .build();
    deliveryResult(request, callback);
}

private static void deliveryResult(final Request request, final ResultCallback callback) {
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(okhttp3.Call call, IOException e) {
            sendFailedStringCallback(request, e, callback);
        }

        @Override
        public void onResponse(okhttp3.Call call, Response response) throws IOException {
            sendSuccessResultCallback(response.body().string() ,callback);
        }
    });
}

private static void sendFailedStringCallback(final Request request, final Exception e, final ResultCallback callback)
{
    handler.post(new Runnable()
    {
        @Override
        public void run()
        {
            if (callback != null)
                callback.onError(request, e);
        }
    });
}

private static void sendSuccessResultCallback(final Object object, final ResultCallback callback)
{
    handler.post(new Runnable()
    {
        @Override
        public void run()
        {
            if (callback != null)
            {
                callback.onResponse(object);
            }
        }
    });
}

public static abstract class ResultCallback<T>
{
    public abstract void onError(Request request, Exception e);

    public abstract void onResponse(T response);
}

调用：

// 可以更新线程post请求
OkhttpUtil.asynPost("http://localhost:9090/TomcatTest/test", "{'name':'shaomiao'}", new OkhttpUtil.ResultCallback<String>() {
    @Override
    public void onError(Request request, Exception e) {
        System.out.println("错误了");
    }

    @Override
    public void onResponse(String response) {
        System.out.println("返回了");
    }
});
// 可以更新线程get请求
OkhttpUtil.asynGet("http://localhost:9090/TomcatTest/test", new OkhttpUtil.ResultCallback() {
    @Override
    public void onError(Request request, Exception e) {
        Toast.makeText(MainActivity.this, "错误", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onResponse(Object response) {
        Toast.makeText(MainActivity.this, response.toString(), Toast.LENGTH_SHORT).show();
    }
});