OKHttp（一）使用

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本文详细介绍了OKHttp库的使用方法，包括依赖引入、权限设置、异步Get和Post请求的实现，以及同步Get请求的处理。通过实例展示了如何进行网络请求并处理响应。

一.什么是OKHttp

二.OKHttp的使用

1.依赖，最新项目地址是 https://github.com/square/okhttp


dependencies {
    implementation("com.squareup.okhttp3:okhttp:3.13.1")
}

2. 把权限加上


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

3.异步Get请求

注意返回的Callback是在Okhttp线程中，而不是主线程

OkHttpClient httpclient = new OkHttpClient();
        String url = "https://www.baidu.com";
        Request request = new Request.Builder()
                .url(url)
                .build();
        Call call = httpclient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.d(TAG, "onFailure: ");
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.d(TAG, "onResponse: " + response.toString());
            }
        });

4.异步Post请求

 String url = "https://www.baidu.com";
        MediaType mediaType = MediaType.parse("text/x-markdown; charset=utf-8");
        String content = "username=shanshan";
        RequestBody requestBody = RequestBody.create(mediaType, content);

        OkHttpClient okHttpClient = new OkHttpClient();
        Request request = new Request.Builder()
                .url(url)
                .post(requestBody)
                .build();

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

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.d(TAG, "thread = " + Thread.currentThread().getName());
                Headers headers = response.headers();
                for (int i = 0; i < headers.size(); i++) {
                    String value = headers.value(i);
                    Log.d(TAG, "onResponse: value = " + value);
                }
            }
        });

5.同步Get请求

 OkHttpClient httpclient = new OkHttpClient();
        String url = "https://www.baidu.com";
        Request request = new Request.Builder()
                .url(url)
                .build();
        Call call = httpclient.newCall(request);
        new Thread(new Runnable() {
            @Override
            public void run() {
                Response response = null;
                try {
                    response = call.execute();
                    Log.d(TAG, "onCreate: response" + response.toString());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();