导入okhttp依赖

compile 'com.squareup.okhttp3:okhttp:3.9.0'

public class MainActivity extends AppCompatActivity {

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

        //get();
       // post();
        //postString();
        //form();
       // multipartBody();....
        cache();//缓存
        //perCall();
    }



    public void get(){

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    OkHttpClient client = new OkHttpClient.Builder()
                            //  .addInterceptor(new LoggingInterceptor())
                            .addNetworkInterceptor(new LoggingInterceptor())
                            .build();

                    Request request = new Request.Builder()
                            .url("http://publicobject.com/helloworld.txt")
                            .build();

                    Call call = client.newCall(request);

                    Response response = call.execute();

                    if(response.isSuccessful()){
                        //返回的数据是 android okhttp机器人图案
                        System.out.println("response = " + response.body().string());
                    }


                } catch (Exception e) {
                    e.printStackTrace();
                }


            }
        }).start();

    }

    //post
    private void post(){
        OkHttpClient client = new OkHttpClient();
        String s = Build.BRAND + "/" + Build.MODEL + "/"+Build.VERSION.RELEASE;

        Request request = new Request.Builder()
                .url("http://tingapi.ting.baidu.com/v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=10&offset=0")
                .addHeader("User-Agent",""+s)
                .build();

        Call call = client.newCall(request);

        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                //输出异常
                System.out.println("e ="+e);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //输出 请求到的数据
                System.out.println("response.body().string() = " + response.body().string());

            }
        });
 }


    public static final MediaType MEDIA_TYPE_MARKDOWN
            = MediaType.parse("text/x-markdown; charset=utf-8");
    public void postString(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    OkHttpClient client = new OkHttpClient();

                    String postBody = ""
                            + "Releases\n"
                            + "--------\n"
                            + "\n"
                            + " * _1.0_ May 6, 2013\n"
                            + " * _1.1_ June 15, 2013\n"
                            + " * _1.2_ August 11, 2013\n";

                    Request request = new Request.Builder()
                            .url("https://api.github.com/markdown/raw")
                            .post(RequestBody.create(MEDIA_TYPE_MARKDOWN,postBody))
                            .build();

                    Response response = client.newCall(request).execute();
                    if(response.isSuccessful()){
                        //返回一堆 网页的布局 h2
                        System.out.println(response.body().string());
                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

    }

    public void form(){
        //表单 post请求 携带参数
        RequestBody requestBody = new FormBody.Builder()
                .add("search","Jurassic Park")
                .build();

        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url("https://en.wikipedia.org/w/index.php")
                .post(requestBody)
                .build();

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

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                System.out.println(response.body().string());
            }
        });

 }

    public static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
    public void multipartBody() {
        RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("key","Value")
                .addFormDataPart("key","filename",RequestBody.create(MEDIA_TYPE_PNG,new File("")))
                .build();

        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url("https://api.imgur.com/3/image")
                .post(requestBody)
                .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 {
                System.out.println(response.body().string());
            }
        });

 }
    public void cache() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                Cache cache = new Cache(getCacheDir(), 10 * 1024 * 1024);

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

                Request request = new Request.Builder()
                        .url("http://publicobject.com/helloworld.txt")
                        .cacheControl(CacheControl.FORCE_NETWORK)//强制走网络
                        .build();


                    Response response1 = client.newCall(request).execute();

                    String response1Body = response1.body().string();

                    System.out.println("Response 1 response:          " + response1);
                    System.out.println("Response 1 cache response:    " + response1.cacheResponse());
                    System.out.println("Response 1 network response:  " + response1.networkResponse());


                    Response response2 = client.newCall(request).execute();
                    String response2Body = response2.body().string();

                    System.out.println("Response 2 response:          " + response2);
                    System.out.println("Response 2 cache response:    " + response2.cacheResponse());
                    System.out.println("Response 2 network response:  " + response2.networkResponse());



                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        }).start();
    }

    OkHttpClient client = new OkHttpClient();

    public void perCall(){
        Request request = new Request.Builder()
                .url("https://en.wikipedia.org/w/index.php")
                .build();

        OkHttpClient okHttpClient1 = client.newBuilder().writeTimeout(10, TimeUnit.SECONDS).build();
        OkHttpClient okHttpClient2 = client.newBuilder().writeTimeout(20,TimeUnit.SECONDS).build();
    }

}

public class LoggingInterceptor implements Interceptor{
    @Override
    //重写的方法
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();

        long t1 = System.nanoTime();
        //logger.info(String.format("Sending request %s on %s%n%s",
        // request.url(), chain.connection(), request.headers()));

        Response response = chain.proceed(request);

        long t2 = System.nanoTime();
       // logger.info(String.format("Received response for %s in %.1fms%n%s",
       // response.request().url(), (t2 - t1) / 1e6d, response.headers()));
        System.out.println("t2 = " + (t2-t1));
        return response;

    }
}