OkHttp使用

转载自：http://blog.youkuaiyun.com/qq_26562641/article/details/53639982

OKHttp是基于Http协议上的网络通讯，相较于HttpClinent，OKHttp就比较轻量级。

HTTP GET

    private final static OkHttpClient client = new OkHttpClient();
    private static void get() throws Exception {
        String url = "http://www.baidu.com";
        Request request = new Request.Builder()
                .url(url)
                .build();
        Response response = client.newCall(request).execute();
        if (response.isSuccessful()) {
            String body = response.body().string();
            System.out.println(body);
        } else {
            throw new IOException("Unexpected code " + response);
        }
    }

Request是OkHttp中访问的请求，Response即OkHttp中的响应，response.body()返回ResponseBody类，可以方便的获取body部分string，也可以通过byteStream()获取InputStream。

HTTP POST

    private final static OkHttpClient client =
            new OkHttpClient.Builder()
                    .connectTimeout(30, TimeUnit.SECONDS)
                    .build();

    private static void post() throws Exception {
        MediaType JSONTYPE = MediaType.parse("application/json; charset=utf-8");
        String json = "";
        String url = "";

        RequestBody body = RequestBody.create(JSONTYPE, json);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        Response response = client.newCall(request).execute();
        if (response.isSuccessful()) {
            String bodyStr = response.body().string();
            System.out.println(bodyStr);
        } else {
            throw new IOException("Unexpected code " + response);
        }
    }

上面例子通过MediaType设置可以提交Json数据，也可以发送键值对数据：

RequestBody formBody = new FormBody.Builder()
        .add("platform", "android")
        .add("name", "bug")
        .add("subject", "XXXXXXXXXXXXXXX")
        .build();

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

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

关于OkHttp的更多用法，参考：http://www.cnblogs.com/ct2011/p/3997368.html