android 网络3 okhttp(1) get/post基本用法

okhttp是一个十分优秀的网络框架，特点网络上搜索便有，就不再赘述，这一篇看okhttp怎么使用

okhttp源码下载地址是：https://github.com/square/okhttp

本文示例下载地址：https://github.com/cmyeyi/NetFramework.git

目前的版本是3.11.0 （2018年8月13日）

使用起来非常简单

1、引入依赖库

在build.gradle中加入

implementation 'com.squareup.okhttp3:okhttp:3.11.0'

如下图：
在加入成功后，会在External Libraries下看到okhttp和okio两个jar。

2、实践get方法

/**
 * 测试okhttp的get方法
 */
private void testOkhttpGet() {
    String url = "http://api.k780.com/?app=weather.history";
    okhttp3.Request request = new okhttp3.Request.Builder().url(url).get().build();
    OkHttpClient okHttpClient = new OkHttpClient();
    final Call call = okHttpClient.newCall(request);
    call.enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Message message = Message.obtain();
            message.what = 0;
            message.obj = e.getMessage();
            mHandler.sendMessage(message);
            Log.d(TAG, "onFailure: " + message.obj.toString());
        }

        @Override
        public void onResponse(Call call, okhttp3.Response response) throws IOException {
            Message message = Message.obtain();
            message.what = 1;
            message.obj = response.body().string();//string不能调用两次 被调用一次就关闭了，这里调用两次会报异常
            mHandler.sendMessage(message);
            Log.d(TAG, "response: " + message.obj.toString());
        }
    });

}

结果仅贴出部分：

response: {"success":"0","msgid":"1000555","msg":"Parameter appkey or sign invalid."}

3、实践post方法

/**
 * 测试okhttp的post方法
 */
private void testOkhttpPost() {
    String url = "http://api.k780.com/?app=weather.history";//
    // &weaid=1&date=2018-08-13&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json";

    OkHttpClient okHttpClient = new OkHttpClient();
    RequestBody body = new FormBody.Builder()
            .add("weaid", "1")
            .add("date", "2018-08-13")
            .add("appkey", "10003")
            .add("sign", "b59bc3ef6191eb9f747dd4e83c99f2a4")
            .add("format", "json")
            .build();

    okhttp3.Request request = new okhttp3.Request.Builder()
            .url(url)
            .post(body)
            .build();

    Call call = okHttpClient.newCall(request);
    call.enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Message message = Message.obtain();
            message.what = 0;
            message.obj = e.getMessage();
            mHandler.sendMessage(message);
            Log.d(TAG, "response: " + message.obj.toString());
        }

        @Override
        public void onResponse(Call call, okhttp3.Response response) throws IOException {
            Message message = Message.obtain();
            message.what = 1;
            message.obj = response.body().string();//string不能调用两次 被调用一次就关闭了，这里调用两次会报异常
            mHandler.sendMessage(message);
            Log.d(TAG, "response: " + message.obj.toString());
        }
    });

}

請求结果：（格式化了一下）
  "success": "1",
  "result": [
    {
      "weaid": "1",
      "week": "星期一",
      "cityno": "beijing",
      "citynm": "北京",
      "cityid": "101010100",
      "uptime": "2018-08-13 00:30:00",
      "temperature": "25℃",
      "humidity": "98%",
      "aqi": "53",
      "weather": "阴",
      "weather_icon": "http://api.k780.com/upload/weather/d/2.gif",
      "wind": "西南风",
      "winp": "1级",
      "temp": "25",
      "weatid": "3",
      "windid": "16",
      "winpid": "201",
      "weather_iconid": "2"
    },
    {
      "weaid": "1",
      "week": "星期一",
      "cityno": "beijing",
      "citynm": "北京",
      "cityid": "101010100",
      "uptime": "2018-08-13 02:30:00",
      "temperature": "25℃",
      "humidity": "98%",
      "aqi": "42",
      "weather": "阵雨",
      "weather_icon": "http://api.k780.com/upload/weather/d/3.gif",
      "wind": "风",
      "winp": "0级",
      "temp": "25",
      "weatid": "4",
      "windid": "423",
      "winpid": "207",
      "weather_iconid": "3"
    }
  ]
}

4、json格式个post请求

/**
 * 测试同步okhttp的post方法，在使用的時候我們必须另起线程
 */
private void testOkhttpPostJson() {
    String url = "http://api.k780.com/?app=weather.history";//


    String json = "{\"format\":\"json\",\"weaid\":1,\"date\":\"2018-08-13\",\"appkey\":\"10003\",\"sign\":\"b59bc3ef6191eb9f747dd4e83c99f2a4\"}";
    OkHttpClient okHttpClient = new OkHttpClient();
    RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), json);
    Request request = new Request.Builder().post(body).url(url).build();

    Call call = okHttpClient.newCall(request);
    call.enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Message message = Message.obtain();
            message.what = 0;
            message.obj = e.getMessage();
            mHandler.sendMessage(message);
            Log.d(TAG, "response: " + message.obj.toString());
        }

        @Override
        public void onResponse(Call call, okhttp3.Response response) throws IOException {
            Message message = Message.obtain();
            message.what = 1;
            message.obj = response.body().string();//string不能调用两次 被调用一次就关闭了，这里调用两次会报异常
            mHandler.sendMessage(message);
            Log.d(TAG, "response: " + message.obj.toString());
        }
    });
}

请求结果：

response: {"success":"0","msgid":"1000555","msg":"Parameter appkey or sign invalid."}

5、另外还有另外一种使用get、post请求的方式，如下面代码，注意这种方式需要另起线程调用

/**
 * 测试同步okhttp的get方法，在使用的時候我們必须另起线程
 */
private String testOkhttpGetSynchronized() throws IOException {
    String url = "http://api.k780.com/?app=weather.history";

    okhttp3.Request request = new okhttp3.Request.Builder().url(url).get().build();
    OkHttpClient okHttpClient = new OkHttpClient();
    Response response = okHttpClient.newCall(request).execute();
    if (response.isSuccessful()) {
        return response.body().string();
    } else {
        throw new IOException("Unexpected code " + response);
    }

}


/**
 * 测试同步okhttp的post方法，在使用的時候我們必须另起线程
 */
private String testOkhttpPostSynchronized() throws IOException {
    String url = "http://api.k780.com/?app=weather.history";//
    // &weaid=1&date=2018-08-13&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json";

    RequestBody body = new FormBody.Builder()
            .add("weaid", "1")
            .add("date", "2018-08-13")
            .add("appkey", "10003")
            .add("sign", "b59bc3ef6191eb9f747dd4e83c99f2a4")
            .add("format", "json")
            .build();

    okhttp3.Request request = new okhttp3.Request.Builder()
            .url(url)
            .post(body)
            .build();

    OkHttpClient okHttpClient = new OkHttpClient();
    Response response = okHttpClient.newCall(request).execute();
    if (response.isSuccessful()) {
        return response.body().string();
    } else {
        throw new IOException("Unexpected code " + response);
    }

}

另起线程调用，否则报错：

new Thread(new Runnable() {
    @Override
    public void run() {
        Message message = Message.obtain();
        try {
            String result = testOkhttpGetSynchronized();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}).start();

new Thread(new Runnable() {
    @Override
    public void run() {
        Message message = Message.obtain();
        try {
            String result = testOkhttpPostSynchronized();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}).start();