Android使用Okhttp进行数据交互
## 前言
>在遇到Android数据交互的情况时，思考过采取什么方式，在经过一段时间的学习，最终采取Okhttp这一个轻量级网络框架。
## 1、工具类实现
```java
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;
// 后台数据接口基础路径
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)// 设置读取超时时间
.writeTimeout(WRITE_TIMEOUT, TimeUnit.SECONDS)// 设置写的超时时间
.connectTimeout(CONNECT_TIMEOUT, TimeUnit.SECONDS)// 设置连接超时时间
.build();
public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
//post请求，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请求。不带参数
public static String get(String url) throws IOException{
Request request = new Request.Builder()
.url(url)
.get()
.build();
Response response = null;
//同步请求返回的是response对象
response = client.newCall(request).execute();
if (response.isSuccessful()) {
return response.body().string();
} else {
throw new IOException("Unexpected code " + response);
}
}
}
```
## 2、场景应用
举个栗子：商城app中首页中想要获取所有商品数据展示出来
后台用的是springboot，数据接口是：/api/commodity/getAllGoodByType
```java
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();
}
//子线程通知主线程更新ui
private Handler hander = new Handler(){
@Override
public void handleMessage(Message msg) {
switch(msg.what){
case 0:
// notifyDataSetChanged动态更新UI
proAd.notifyDataSetChanged();
proAd.add(proList.getData());
// 在适配器上添加数据
recommendRec.setAdapter(proAd);
break;
default:
// do something
break;
}
}
};
```
- 注意：在进行数据交互时，需要在android中开启网络权限，才能够访问到后台数据
```xml