在url.openConnection（）上获取不完整的HTML源代码

Question

我正在尝试获取网站的HTML页面源代码。但我无法获得一些图像链接，我认为这些链接是在网页上动态填充的。

我使用java作为：

url = new URL(firstLevelURL);
connection = (HttpURLConnection) url.openConnection();

try ( // Read all the text returned by the server
     BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"))) {
    // Read each line of "in" until done, adding each to "response"
    while ((str = br.readLine()) != null) {
    // str is one line of text readLine() strips newline characters


      //I am not able to get this image as it is loaded dynamically using javascript/ajax or something.
       if(str.contains("<img id=\"tileImage")) {
          response = str;
          break;
       }
    }
}

我尝试过使用： connection.setReadTimeout（15 * 1000）; 但该页面仍未完全加载

在获取HTML源代码之前是否有任何方法可以等待页面完全加载