public void testDoGet(){
        String api="";
        HttpURLConnection connection = null;
        InputStream in=null;
        BufferedReader reader=null;
        try{
            //構(gòu)造一個URL對象
            URL url = new URL(api);
            //獲取URLConnection對象
            connection= (HttpURLConnection) url.openConnection();
            //getOutputStream會隱含的進(jìn)行connect(即：如同調(diào)用上面的connect()方法，所以在開發(fā)中不調(diào)用connect()也可以)
            in = connection.getInputStream();
            //通過InputStreamReader將字節(jié)流轉(zhuǎn)換成字符串，在通過BufferedReader將字符流轉(zhuǎn)換成自帶緩沖流
            reader = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8));
            StringBuilder sb = new StringBuilder();
            String line = null;
            //按行讀取
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            String response= sb.toString();
            System.out.println(response);
        }catch (Exception exception){
            exception.printStackTrace();
        }finally {
            if (connection != null) {
                connection.disconnect();
            }
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

 public void testDoPost(){
        String apiUrl = "https://www.goyeer.com/api";
        String username  = "Goyeer";
        String password  = "123456";
        String tenantUrl = "";
        HttpURLConnection conn = null;
        OutputStream out = null;
        InputStream in = null;
        String idToken = null;
        try
        {
           // 構(gòu)造一個URL對象
            URL url = new URL(apiUrl);
            // 獲取URLConnection對象
            conn = (HttpURLConnection) url.openConnection();
            // 限制socket等待建立連接的時間，超時將會拋出java.net.SocketTimeoutException
            conn.setConnectTimeout(3000);
            // 限制輸入流等待數(shù)據(jù)到達(dá)的時間，超時將會拋出java.net.SocketTimeoutException
            conn.setReadTimeout(3000);
            // 設(shè)定請求的方法為"POST"，默認(rèn)是GET
            conn.setRequestMethod("POST");
            // 設(shè)置傳送的內(nèi)容類型是json格式
            conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
            // 接收的內(nèi)容類型也是json格式
            conn.setRequestProperty("Accept", "application/json;charset=utf-8");
            // 設(shè)置是否從httpUrlConnection讀入，默認(rèn)情況下是true
            conn.setDoInput(true);
            // 由于URLConnection在默認(rèn)的情況下不允許輸出，所以在請求輸出流之前必須調(diào)用setDoOutput(true)。為一個HTTP URL將doOutput設(shè)置為true時，請求方法將由GET變?yōu)镻OST
            conn.setDoOutput(true);
            // 是否使用緩存，Post方式不能使用緩存
            conn.setUseCaches(false);
            // 準(zhǔn)備數(shù)據(jù)
            JSONObject json = new JSONObject();
            json.put("username", username);
            json.put("password", DigestUtils.md5Hex(password));
            json.put("tenantUrl", tenantUrl);
            // 返回一個OutputStream，可以用來寫入數(shù)據(jù)傳送給服務(wù)器
            out = conn.getOutputStream();
            // 將數(shù)據(jù)寫入到輸出流中
            out.write(json.toString().getBytes(StandardCharsets.UTF_8));
            // 刷新管道
            out.flush();
            // 建立連接
            conn.connect();
            // 判斷數(shù)字響應(yīng)碼是否是200
            int responseCode = conn.getResponseCode();
            String result="";
            if (responseCode == 200) {
                // 獲取輸入流
                in = conn.getInputStream();
                // 獲取返回的內(nèi)容
                StringWriter sw = new StringWriter();
                InputStreamReader reader = new InputStreamReader(in, StandardCharsets.UTF_8);
                char[] buffer = new char[4096];
                for (int n = 0; -1 != (n = reader.read(buffer)); ) {
                    sw.write(buffer, 0, n);
                }
                result = sw.toString();
                System.out.println(result);
            }
        }catch (Exception exception){
            exception.printStackTrace();
        }finally {
            if (conn != null) {
                conn.disconnect();
            }
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        }
    }