Okhttp 网络请求设置 缓存

第一步：导入依赖

compile 'com.squareup.okhttp3:okhttp:3.8.1'    

第二步：Java代码中实现

 long cacheSize = 1024 * 1024 * 20;// 缓存文件最大限制大小20M
String cacheDirectory = Environment.getExternalStorageDirectory() + "/okttpcaches"; // 设置缓存文件路径
Cache cache = new Cache(new File(cacheDirectory), cacheSize);  //

OkHttpClient.Builder builder = new OkHttpClient.Builder();
builder.connectTimeout(8, TimeUnit.SECONDS);//连接超时时间
builder.writeTimeout(8,TimeUnit.SECONDS);//设置写入超时时间
builder.readTimeout(8,TimeUnit.SECONDS);//设置读取超时时间
builder.retryOnConnectionFailure(true);//设置连接失败重试
builder.cache(cache);//设置缓存
OkHttpClient okHttpClient = builder.build();

Request request = new Request.Builder()
        .cacheControl(new CacheControl.Builder().maxStale(60*60*2, TimeUnit.SECONDS).build())
        .url("http://v.juhe.cn/toutiao/index?type=top&key=097060266650f67b2cebd2a06aded587")
        .build();
okHttpClient.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {

    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        final String string = response.body().string();
        //切换主线程
        MainActivity.this.runOnUiThread(new Runnable() {

            @Override
            public void run() {
               
                    }
                });
            }
        });
    }
});