3、解析網絡返回值

//weixin測試id
private static final String appId = "wxbea13caead95d9d1";
private static final String appSecret = "f518f8f5fe4dd731a6184e208bf37fe4";
public String getAccessToken(){ // 獲得ACCESS_TOKEN

        String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="
                + appId + "&secret=" +appSecret;

        String accessToken = null;
        try {
            URL urlGet = new URL(url);
            HttpURLConnection http = (HttpURLConnection) urlGet.openConnection(); 

            http.setRequestMethod("GET"); //必須是get方式請求 
            http.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); 
            http.setDoOutput(true); 
            http.setDoInput(true);
            System.setProperty("sun.net.client.defaultConnectTimeout", "30000");//連接超時30秒
            System.setProperty("sun.net.client.defaultReadTimeout", "30000"); //讀取超時30秒

            http.connect();

            InputStream is =http.getInputStream();
            int size =is.available();
            byte[] jsonBytes =new byte[size];
            is.read(jsonBytes);
            String message = new String(jsonBytes,"UTF-8");

            Access accessParse = JSON.parseObject(message,Access.class);
            System.out.println("parser: "+accessParse.getAccess_token());
            System.out.println("timeout: "+accessParse.getExpires_in());

        } catch (Exception e) {
            e.printStackTrace();
        }
        return accessToken;
    }

3.2 Android用法

有了上面的例子，在Android上使用也是類似的。
只不過網絡操作時要有網絡權限，並在workThread中進行操作。
同樣的代碼，直接用在Android上。

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mTvMessage = (TextView)findViewById(R.id.tv_message);
    mEtUrl = (EditText)findViewById(R.id.et_url);

    parseJson();
    new Thread(new Runnable() {
        @Override
        public void run() {
            getAccessToken();
        }
    }).start();
}

private void parseJson() {
        Access access = new Access("adgdfjlkjlkjsdlkfjslkjf","68900");
        String tmp = JSON.toJSONString(access);
        Log.d(TAG, tmp);

        Access accessParse = JSON.parseObject(JSON_STRING,Access.class);
        Log.d(TAG,"parser: "+accessParse.getAccess_token());
        mTvMessage.setText("parser: " + accessParse.getAccess_token());

        //arrayList
        List accessList = new ArrayList();
        accessList.add(access);
        Access access2 = new Access("lincyang","12345");
        accessList.add(access2);
        String tmp2 = JSON.toJSONString(accessList);
        Log.d(TAG, tmp2);
        List list = JSON.parseObject(tmp2,new TypeReference