HttpURLConnection的基本使用

• 1.GET请求方式

@Test
public void test3() {
    HttpURLConnection connection = null;
    try {
        URL url = new URL("http://www.baidu.com");
        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(10000);
        connection.setReadTimeout(10000);
        connection.connect();
        if (connection.getResponseCode() == 200) {
            InputStream inputStream = connection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String res = "";
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                res += line;
            }
            System.out.println(res);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
    }
}

OkHttp的使用

• 1.GET请求方式

@Test
public void test4() throws IOException {
    //okhttp   get请求方式
    OkHttpClient okHttpClient = new OkHttpClient();
    Request request = new Request.Builder()
            .url("http://www.baidu.com")
            .get()
            .build();

    okhttp3.Response response = okHttpClient.newCall(request).execute();
    if (response.isSuccessful()) {
        ResponseBody body = response.body();
        System.out.println(body.string());
    }
}

• 2.POST请求方式

@Test
public void test5() throws IOException {
    //okhttp post请求

    //OkHttp客户端
    OkHttpClient okHttpClient = new OkHttpClient();

    //请求体
    RequestBody build = new FormBody.Builder()
            .add("aaa", "aaa")
            .build();

    //请求对象
    Request request = new Request.Builder()
            .url("http://www.baidu.com")
            .post(build)
            .build();

    okhttp3.Response response = okHttpClient.newCall(request).execute();

    if (response.isSuccessful()) {
        ResponseBody body = response.body();
        String string = body.string();
        System.out.println(string);
    }
}

• 3.提交JSON数据到服务器

public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

@Test
public void postJson() throws IOException {
    //申明给服务端传递一个json串
    //创建一个OkHttpClient对象
    OkHttpClient okHttpClient = new OkHttpClient();

    //创建一个RequestBody(参数1：数据类型 参数2传递的json串)
    //json为String类型的json数据
    RequestBody requestBody = RequestBody.create(JSON, "{}");

    //创建一个请求对象
    Request request = new Request.Builder()
            .url("http://www.baidu.com")
            .post(requestBody)
            .build();

    //发送请求获取响应
    okhttp3.Response response = okHttpClient.newCall(request).execute();

    //判断请求是否成功
    if (response.isSuccessful()) {
        ResponseBody body = response.body();
        //打印服务端返回结果
        System.out.println(body.string());
    }
}