OKHttp3 从使用到原理分析

implementation  'com.squareup.okhttp3:okhttp:4.9.0'
implementation  'com.squareup.okio:okio:2.9.0'

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

 OkHttpClient httpClient = new OkHttpClient();
        MediaType contentType = MediaType.Companion.parse("text/x-markdown; charset=utf-8");
        String content = "hello!";
        RequestBody body = RequestBody.Companion.create(content,contentType);
        Request getRequest = new Request.Builder()
                .url("https://api.github.com/markdown/raw")
                .post(body)
                .build();
        Call call = httpClient.newCall(getRequest);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
            }
            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                Log.i("MainActivity", "okHttpPost enqueue: \n onResponse:"+ response.toString() +"\n body:" + Objects.requireNonNull(response.body()).string());
            }
        });
    }

  OkHttpClient httpClient = new OkHttpClient();
//        MediaType contentType = MediaType.parse("text/x-markdown; charset=utf-8");
//        String content = "hello!";
//        RequestBody body = RequestBody.create(contentType, content);
        //RequestBody:fileBody,上传文件
        File file = drawableToFile(this, R.mipmap.bigpic, new File("00.jpg"));
        RequestBody fileBody = RequestBody.create(MediaType.parse("image/jpg"), file);
        //RequestBody:multipartBody, 多类型 （用户名、密码、头像）
        MultipartBody multipartBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("username", "hufeiyang")
                .addFormDataPart("phone", "123456")
                .addFormDataPart("touxiang", "00.png", fileBody)
                .build();
        Request getRequest = new Request.Builder()
                .url("http://yun918.cn/study/public/file_upload.php")
                .post(multipartBody)
                .build();
        Call call = httpClient.newCall(getRequest);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.i(TAG, "okHttpPost enqueue: \n onFailure:"+ call.request().toString() +"\n body:" +call.request().body().contentType()
                +"\n IOException:"+e.getMessage());
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.i(TAG, "okHttpPost enqueue: \n onResponse:"+ response.toString() +"\n body:" +response.body().string());
            }
        });

// 创建 OkHttpClient 实例 
        OkHttpClient httpClient = new OkHttpClient();
// 将 MicroKibaco github 实例 url 传入Request.Builder 实例
        String url = "https://github.com/MicroKibaco";
        Request getRequest = new Request.Builder()
                .url(url)
                .get()
                .build();
// httpClient.newCall 传入 Request实例生成call
        Call call = httpClient.newCall(getRequest);
             //同步请求，要放到子线程执行
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Response response = call.execute();
                    Log.i(TAG, "okHttpGet run: response:"+ response.body().string());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();

        OkHttpClient httpClient = new OkHttpClient();
      String url = "https://www.baidu.com/";
        Request getRequest = new Request.Builder()
                .url(url)
                .get()
                .build();
        Call call = httpClient.newCall(getRequest);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
            }
            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                Log.i("MainActivity", "okHttpGet run: response:"+ Objects.requireNonNull(response.body()).string());
            }
        });
    }

 OkHttpClient client = new OkHttpClient.Builder()
 // 设置了连接、读取、写入的超时时长
.connectTimeout(15, TimeUnit.SECONDS)
.readTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10, TimeUnit.SECONDS)
// cache()方法传入了由缓存目录、缓存大小构成的Cache实例
.cache(new Cache(getExternalCacheDir(),500 * 1024 * 1024))
.addInterceptor(new Interceptor() {
// intercept()方法会在开始执行请求时调用。其中chain.proceed(request)内部是真正请求的过程，是阻塞操作，执行完后会就会得到请求结果ResponseBody
                    @Override
                    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
       String url = request.url().toString();
       Log.i(TAG, "intercept: proceed start: url"+ url+ ", at "+System.currentTimeMillis());
// chain.proceed(request)的前后取当前时间，那么就知道整个请求所耗费的时间。上面chain.proceed(request)的前后分别打印的日志和时间
      Response response = chain.proceed(request);
      ResponseBody body = response.body();
      Log.i(TAG, "intercept: proceed end: url"+ url+ ", at "+System.currentTimeMillis());
                        return response;
                    }
                })
.build();

 Request getRequest = new Request.Builder()
                .url("http://yun918.cn/study/public/file_upload.php")
                .post(multipartBody)
                .addHeader("key","value")
                .cacheControl(CacheControl.FORCE_NETWORK)
                .build();