1、okhttp3簡介：

一個處理網(wǎng)絡(luò)請求的開源項目,是安卓端最火熱的輕量級框架

2、okhttp3配置

1.Android Studio 配置gradle：
    implementation 'com.squareup.okhttp3:okhttp:3.12.0'
2,添加網(wǎng)絡(luò)權(quán)限：
    <uses-permission android:name="android.permission.INTERNET"/>

03坟岔、okhttp3使用思路

get請求思路

1.獲取okHttpClient對象
2.構(gòu)建Request對象
3.構(gòu)建Call對象
4.通過Call.enqueue(callback)方法來提交異步請求拼苍；execute()方法實現(xiàn)同步請求

post請求思路

1.獲取okHttpClient對象
2.創(chuàng)建RequestBody
3.構(gòu)建Request對象
4.構(gòu)建Call對象
5.通過Call.enqueue(callback)方法來提交異步請求徘郭；execute()方法實現(xiàn)同步請求

04来庭、OkHttp3 發(fā)送異步請求（GET）

        String url = "http://";

        //第一步獲取okHttpClient對象
        OkHttpClient client = new OkHttpClient();
        //第二步構(gòu)建Request對象
        Request request = new Request.Builder()
                .url(url)
                .get()
                .build();
        //第三步構(gòu)建Call對象
        Call call = client.newCall(request);
        //第四步:異步get請求
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.i("onFailure", e.getMessage());
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String result = response.body().string();
                Log.i("result", result);
            }
        });

05妒蔚、OkHttp3 發(fā)送異步請求（POST）

      //接口參數(shù) String username,String password

      String url = "http://";
      //第一步創(chuàng)建OKHttpClient
      OkHttpClient client = new OkHttpClient.Builder()
            .build();
      //第二步創(chuàng)建RequestBody（Form表達）
      RequestBody body = new FormBody.Builder()
            .add("username", "admin")
            .add("password", "123456")
            .build();
      //第三步創(chuàng)建Rquest
      Request request = new Request.Builder()
              .url(url)
              .post(body)
              .build();
      //第四步創(chuàng)建call回調(diào)對象
      final Call call = client.newCall(request);
      //第五步發(fā)起請求
      call.enqueue(new Callback() {
          @Override
          public void onFailure(Call call, IOException e) {
              Log.i("onFailure", e.getMessage());
          }

          @Override
          public void onResponse(Call call, Response response) throws IOException {
              String result = response.body().string();
              Log.i("result", result);
          }
      });