OkHttp的介绍及基础使用

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特点

    开源Http库    支持GZIP压缩    支持响应缓存    支持链接复用    Okhttp作为安卓4.4的UrlConnection的底层采纳

配置

    compile 'com.squareup.okhttp3:okhttp:3.4.1'

配置OkhttpClient

//单独配置一个使用newBuilder()    private OkHttpClient mHttpClient = new OkHttpClient.Builder()            .connectTimeout(10, TimeUnit.SECONDS)            .readTimeout(10, TimeUnit.SECONDS)            .writeTimeout(10, TimeUnit.SECONDS).build();

get请求

    private String doGet() {        Request request = new Request.Builder().url("http://httpbin.org/get")                .header("User-Agent", "OkHttpDemo/1.0")//同一个key,覆盖                .header("User-Agent", "OkHttpDemo/2.0")                .addHeader("X-Key", "value1")                .addHeader("X-Key", "value2").build();//同一个key,追加        try {            Response response = mHttpClient.newCall(request).execute();            if (response.isSuccessful()) {                return response.body().string();            }        } catch (IOException e) {            e.printStackTrace();        }        return null;    }

post请求

    private String doPost() {        //请求体        RequestBody requestBody = new RequestBody() {            @Override            public MediaType contentType() {                return MediaType.parse("text/plain");            }            @Override            public void writeTo(BufferedSink sink) throws IOException {                InputStream inputStream = getResources().openRawResource(R.raw.data);                byte[] buffer = new byte[1024];                int read;                while ((read = inputStream.read(buffer)) > 0) {                    sink.write(buffer, 0, read);                }                sink.flush();                inputStream.close();            }        };        MultipartBody multipartBody = new MultipartBody.Builder().addPart(requestBody)                .addPart(RequestBody.create(MediaType.parse("text/plain"),                        "this is test data from code")).build();        Request request = new Request.Builder().url("http://httpbin.org/post")                .header("User-Agent", "OkHttpDemo/1.0")                .method("POST", multipartBody)                .build();        try {            Call call = mHttpClient.newCall(request);            Response response = call.execute();            if (response.isSuccessful()) {                return response.body().string();            }        } catch (IOException e) {            e.printStackTrace();        }        return null;    }

异步get请求

    private void doGetAsync() {        Request request = new Request.Builder().url("http://httpbin.org/get")                .header("User-Agent", "OkHttpDemo/1.0").build();        mHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, final Response response) throws IOException {                if (response.isSuccessful()) {                    final String result = response.body().string();                    mTvContent.post(new Runnable() {                        @Override                        public void run() {                            mTvContent.setText(result);                        }                    });                }            }        });    }

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