Spring 4-服务器启动后运行方法

Question

I need to run some code just after server starts. I used ServletContextListener and it worked good, however... it run the code before server started. Because of that I got the timeout exception on server as it cannot start because my method is still running. There is no point in increasing the timeout time as this method takes about 1 hour. What should I do?

Answer 1

For better clarity, this is how you can do @PostConstruct. Put the below code in any of you config singleton bean defined in spring. For more details read what and how Postconstruct works. This should help you to load async after server is started.

    public class singletonBeanConfig{
SimpleAsyncTaskExecutor simpleAsyncTaskExecutor = new SimpleAsyncTaskExecutor();

private class SampleConfigurator implements Runnable {

        @Override
        public void run() {
            // run you process here.            
        }

    }

@PostConstruct
    public final void initData() {
        // this will be executed when the config singleton is initialized completely.
        this.simpleAsyncTaskExecutor.execute(new SampleConfigurator());
    }
}

Answer 2

You can use an ApplicationListener

    public class MyApplicationListener implements ApplicationListener<ContextRefreshedEvent> {

      public void onApplicationEvent(final ContextRefreshedEvent event) {
        ApplicationContext ctx = event.getApplicationContext();
        (new Thread() {
           public void run() {
             // do stuff
           }
         }).start();
      }

    }

Just register that as a Spring bean. As suggested in the comments, you can execute the code on another thread.