有没有一种方法可以通过编程方式使Tomcat停止监听http端口

Question

When a Tomcat application server starts, i need to make sure all other interfacing device is online before listening to the incoming HTTP request. Is there a way to do so programatically from java?

Answer 1

One way to do this would be to set the size of the thread pool associated with the http connector to zero (minSpareThreads) and then use JMX to set it to a higher value.

Just a theory - not sure if it will work.

Another option would be to explore extending the connectors with an ability to start / stop via JMX.

This post also outlines how to stop / start a connector using JMX. http://java-monitor.com/forum/showthread.php?t=169

Answer 2

If the wait is short, then I would try using a Filter. See
http://www.oracle.com/technetwork/java/filters-137243.html
http://docs.oracle.com/javaee/5/tutorial/doc/bnagb.html
You can check your interfacing devices in it's init method. You do't need to do anything in it's doFilter method.

Answer 3

public class TestFilter implements Filter {
  public void init(FilterConfig config) throws ServletException{
                     System.out.println("init of TestFilter");
                     // Make sure all other interfacing device is online here.
  }
  public void destroy(){}        
  public void doFilter(ServletRequest req,ServletResponse resp,FilterChain chain)
     throws ServletException, IOException {   
                     chain.doFilter(req,resp);
  }
}