java代碼調用http接口

public static void main(String[] args) throws Exception {
        //請求的webservice的url
        URL url = new URL("http://");
        //創建http鏈接
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
    
        //設置請求的方法類型
        httpURLConnection.setRequestMethod("POST");
        
        //設置請求的內容類型
        httpURLConnection.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
        
        //設置發送數據
        httpURLConnection.setDoOutput(true);
        //設置接受數據
        httpURLConnection.setDoInput(true);
        
        //發送數據,使用輸出流
        OutputStream outputStream = httpURLConnection.getOutputStream();
        //發送的soap協議的數據
        String requestXmlString = requestXml("北京");
    
        String content = "user_id="+ URLEncoder.encode("123", "gbk");
        
        //發送數據
        outputStream.write(content.getBytes());
    
        //接收數據
        InputStream inputStream = httpURLConnection.getInputStream();
    
        //定義字節數組
        byte[] b = new byte[1024];
        
        //定義一個輸出流存儲接收到的數據
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        
        //開始接收數據
        int len = 0;
        while (true) {
            len = inputStream.read(b);
            if (len == -1) {
                //數據讀完
                break;
            }
            byteArrayOutputStream.write(b, 0, len);
        }
        
        //從輸出流中獲取讀取到數據(服務端返回的)
        String response = byteArrayOutputStream.toString();
        
        System.out.println(response);
        
    }