okhttp使用

准备工作：
1、导入okhttp-2.7.5.jar和okio-1.11.0.jar
2、权限设置

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

一、post请求：

public void getData(String url){
    new Thread(new Runnable() {
        @Override
        public void run() {
            try {
               String s="";//入参  json形式
                OkHttpClient client = new OkHttpClient();
                RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), s);
                Request request = new Request.Builder()
                        .post(body)
                        .url(url).
                                build();
                Response response = null;
                response = client.newCall(request).execute();//得到Response 对象
                if (response.isSuccessful()) {
                    Log.d("response.code()==",response.code()+"");
                    Log.d("response.message()==",response.message());
                    Log.d("res==",response.body().string());

                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();
}
运行结果：

D/response.code()==: 200
D/response.message()==: OK
D/res==: {"result":"ok","airTemperature":19,"airTempMaxValue":25,"airTempMinValue":18,"airHumidity":58,"airHumiMaxValue":25,"airHumiMinValue":18,"earthTemperature":14,"earthTempMaxValue":25,"earthTempMinValue":18,"earthHumidity":3,"earthHumiMaxValue":25,"earthHumiMinValue":18,"light":70,"lightMaxValue":25,"lightMinValue":18,"co2":77,"co2MaxValue":25,"co2MinValue":18}

二、get请求

public void getDataByGet(String url) {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
            .get()
            .url(url)
            .build();
    //通过client发起请求
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Request request, IOException e) {

        }
        @Override
        public void onResponse(Response response) throws IOException {
            if (response.isSuccessful()) {
                str = response.body().string();
                Log.d("=====", str);
            }
        }
    });
}

运行结果：

D/=====: {"RESULT": "S", "data": [{"stop": false, "speedmin": 0, "carplate": "宝马", "carno": "辽A10001", "$min": 0, "$max": 10000, "amount": 1653.0, "speedmax": 1000, "who": "张三", "speed": 100}, {"stop": false, "speedmin": 0, "carplate": "中华", "carno": "辽A10002", "$min": 0, "$max": 10000, "amount": 1162.0, "speedmax": 1000, "who": "李四", "speed": 100}, {"stop": false, "speedmin": 0, "carplate": "奔驰", "carno": "辽A10003", "$min": 0, "$max": 10000, "amount": 143.0, "speedmax": 1000, "who": "王五", "speed": 100}, {"stop": false, "speedmin": 0, "carplate": "马自达", "carno": "辽A10004", "$min": 0, "$max": 10000, "amount": 21.0, "speedmax": 1000, "who": "赵六", "speed": 100}, {"stop": false, "speedmin": 0, "carplate": "斯柯达", "carno": "辽A10005", "$min": 0, "$max": 10000, "amount": 0, "speedmax": 1000, "who": "上官六", "speed": 100}], "ERRMSG": "成功"}

三、异步

1.异步请求，通过接口回调告知用户 http 的异步执行结果

//通过client发起请求
client.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Request request, IOException e) {

    }
    @Override
    public void onResponse(Response response) throws IOException {
        if (response.isSuccessful()) {
            str = response.body().string();
            Log.d("=====", str);
        }
    }
});

2、同步请求

if (response.isSuccessful()) {
    Log.d("response.code()==", response.code() + "");
    Log.d("response.message()==", response.message());
    Log.d("res==", response.body().string());

}

思考：post方法的写法，是放入线程中的，可以考虑实现两点
1、模仿上面get方式，网络访问不放入线程中的写法
2、post用异步访问的方式写