OkHttp缓存工具类----饿汉式

package app.jiyun.com.android_day02_okhttp.design;

import android.os.Environment;

import java.io.File;

import java.io.IOException;

import java.util.concurrent.TimeUnit;

import okhttp3.Cache;

import okhttp3.CacheControl;

import okhttp3.Callback;

import okhttp3.FormBody;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

/**

 * Created by lvxinxin on 2017/12/19.

 * OKHTTP工具类

 * 加入缓存

 */

public class MyOkHttp {

    private static MyOkHttp myOkHttp = new MyOkHttp();

    private OkHttpClient okHttpClient;

    private Cache cache;

    private long maxSize = 8 * 1024 * 1024;

    private MyOkHttp() {

        //Environment用来管理手机SDcard内存的

        File file = new File(Environment.getExternalStorageDirectory() + "/H1706A");

        cache = new Cache(file, maxSize);

        //OKHTTPClient两种写法 第二种就是通过构造者模式也可以使用

        okHttpClient = new OkHttpClient.Builder().cache(cache).build();

    }

    public static MyOkHttp getMyOkHttp() {

        return myOkHttp;

    }

    //同步下get，Post

    public String sendGet(String url) throws IOException {

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

        Response response = okHttpClient.newCall(request).execute();

        return response.body().string();

    }

    //同步下Post

    public String sendPost(String url, RequestBody body) throws IOException {

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

        Response response = okHttpClient.newCall(request).execute();

        return response.body().string();

    }

    //异步的封装 GET和POST自己 预习一下缓存OkHttp如何使用缓存

    public void sendAsyncGet(String url, Callback callback) {

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

        okHttpClient.newCall(request).enqueue(callback);

    }

    //异步的POST

    public void sendAsyncPost(String url, RequestBody body, Callback callback) {

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

        okHttpClient.newCall(request).enqueue(callback);

    }

    //测试缓存

    public String sendCacheGet(String url) throws IOException {

        //要缓存数据  需要加上一个方法cacheControl

        Request request = new Request.Builder().url(url).cacheControl(new CacheControl.Builder().maxStale(24 * 60 * 60, TimeUnit.SECONDS).build()).build();

        Response response = okHttpClient.newCall(request).execute();

        return response.body().string();

    }

}