Android网络框架---OkHttp3

1、添加依赖 compile 'com.squareup.okhttp3:okhttp:3.4.2'
　　project Structure-->dependencied/搜索okhttp.

       compile 'com.squareup.okhttp3:okhttp:3.4.2'

 2、添加权限
　<uses-permission android:name="android.permission.INTERNET"/>

   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    //基本请求默认GET请求
    public void net1(View v){
        //可以通过构造方法来使用。使用Builder模式可以设置一些属性
//        OkHttpClient client = new OkHttpClient();
        //缓存的请求的数据，json字符串,
        //Cache questCache = new Cache(new File("cache"),1024);
        OkHttpClient client = new OkHttpClient.Builder()
                //读取超时5s
                .readTimeout(5000, TimeUnit.MILLISECONDS)
                //自带缓存,缓存可做可不做，做了就是让刷新的时候方便些，不会重复去请求同一个url多次
                //.cache(questCache)
                .build();

        //默认GET请求
        Request request = new Request.Builder()
                .url("https://www.baidu.com")
                .build();

        //call就是我们可以执行的请求类
        Call call = client.newCall(request);


//        try {
//            //同步方法，程序运行到这里会等待，所以这里我们不用这个方法
//            Response execute = call.execute();
//        } catch (IOException e) {
//            e.printStackTrace();
//        }

        //异步请求
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e("TAG","请求失败");
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //子线程
                Log.e("TAG",Thread.currentThread().getName()+"---结果："+response.body().string());
                //修改UI使用 runOnUiThread();或者使用Handler发送更新UI消息给主线程
            }
        });

        //取消
//        call.cancel();
    }

    //POST请求
    public void net2(View v){
        OkHttpClient client = new OkHttpClient.Builder()
                .readTimeout(5000,TimeUnit.MILLISECONDS)
                .build();

        //创建Form表单对象，可以add多个键值对
        RequestBody body = new FormBody.Builder()
                .add("showapi_appid","27306")
                .add("showapi_sign","150e9206e7f542bab4affe49d73cb920")
                .build();

        Request request = new Request.Builder().url("http://route.showapi.com/578-6")
                .post(body)//添加参数
                .build();

        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e("TAG","请求失败");
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.e("TAG","---->"+response.toString());
                //子线程
            }
        });

    }

    //文件上传
    public void net3(View v){
        OkHttpClient client = new OkHttpClient.Builder()
                .readTimeout(5000,TimeUnit.MILLISECONDS)
                .build();

        //添加多个文件
        RequestBody fileBody = MultipartBody.create(MediaType.parse("application/octet-stream"),new File("上传的文件地址"));


        RequestBody body = new MultipartBody.Builder()
                //设置为表单类型
                .setType(MultipartBody.FORM)
                //添加表单键值
                .addFormDataPart("image头像字段名称","name文件名称",fileBody)
                .build();

        Request request = new Request.Builder()
                .url("http://192.168.18.250")
                .post(body)
                .build();

        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //子线程
            }
        });
    }
}

参考资料：

http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0106/2275.html