关于android:Android使用Okhttp进行数据交互

前言

在遇到 Android 数据交互的状况时，思考过采取什么形式，在通过一段时间的学习，最终采取 Okhttp 这一个轻量级网络框架。

1、工具类实现

public class OkHttpUtil {

    public final static String TAG = "OkHttpUtil";
    public final static int CONNECT_TIMEOUT = 60;
    public final static int READ_TIMEOUT = 100;
    public final static int WRITE_TIMEOUT = 60;
    // 后盾数据接口根底门路
    public final static String BASE_URL="http://192.168.64.1:8010";
    public static final OkHttpClient client = new OkHttpClient.Builder()
            .readTimeout(READ_TIMEOUT, TimeUnit.SECONDS)// 设置读取超时工夫
            .writeTimeout(WRITE_TIMEOUT, TimeUnit.SECONDS)// 设置写的超时工夫
            .connectTimeout(CONNECT_TIMEOUT, TimeUnit.SECONDS)// 设置连贯超时工夫
            .build();
    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

    //post 申请，携带参数
    public static String post(String url, String json) throws IOException {RequestBody body = RequestBody.create(JSON, json);
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        Response response = client.newCall(request).execute();
        if (response.isSuccessful()) {return response.body().string();} else {throw new IOException("Unexpected code" + response);
        }
    }
    //get 申请。不带参数
     public static String get(String url) throws IOException{Request request = new Request.Builder()
                .url(url)
                .get()
                .build();
        Response response = null;
        // 同步申请返回的是 response 对象
        response = client.newCall(request).execute();
        if (response.isSuccessful()) {return response.body().string();} else {throw new IOException("Unexpected code" + response);
        }
    }
 }

2、场景利用

举个栗子：商城 app 中首页中想要获取所有商品数据展现进去

后盾用的是 springboot，数据接口是：/api/commodity/getAllGoodByType

    private void initProducts() {
        String url = OkHttpUtil.BASE_URL + "/api/commodity/getAllGoodByType";
        // 主线程
        new Thread(new Runnable() { 
            @Override
            public void run() {
                try {String callStr = OkHttpUtil.get(url);
                    JSONObject call_json = JSONObject.parseObject(callStr);
                    final String code = call_json.getString("code");
                    final String msg = call_json.getString("msg");
                    if (code.equals("0")) {proList = JSON.parseObject(callStr, GoodsBean.class);
                        // 开启子线程，更新 UI 界面
                        hander.sendEmptyMessage(0);
                        Looper.prepare();
                        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
                        Looper.loop();} else if (code.equals("500")) {Looper.prepare();
                        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
                        Looper.loop();}
                } catch (IOException e) {e.printStackTrace();
                }
            }
        }).start();}

    // 子线程告诉主线程更新 ui
    private Handler hander = new Handler(){
        @Override
        public void handleMessage(Message msg) {switch(msg.what){
                case 0:
                    // notifyDataSetChanged 动静更新 UI
                    proAd.notifyDataSetChanged();
                    proAd.add(proList.getData());
                    // 在适配器上增加数据
                    recommendRec.setAdapter(proAd);
                    break;
                default:
                    // do something
                    break;
            }
        }
    };

• 留神：在进行数据交互时，须要在 android 中开启网络权限，才可能拜访到后盾数据

  <!-- 容许用户拜访网络，这一行要加在 <manifest> 的下一行 -->
  <uses-permission android:name="android.permission.INTERNET" />