java如何实现项目启动时执行指定方法

 <listener>  <listener-class>com.listener.InitListener</listener-class> </listener> 

package com.listener;import java.io.File;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import com.seegot.util.PropertyUtil;public class InitListener implements ServletContextListener { @Override public void contextDestroyed(ServletContextEvent arg0) {  // TODO Auto-generated method stub } @Override public void contextInitialized(ServletContextEvent arg0) {  // TODO Auto-generated method stub  System.out.println("================>[ServletContextListener]自动加载启动开始.");   String resourceFilesPath = PropertyUtil.getProperty("tempZipPath");  clearFiles(resourceFilesPath); } // 删除文件和目录 private static boolean clearFiles(String workspaceRootPath) {  File file = new File(workspaceRootPath);  if (file.exists()) {   deleteFile(file);  }  // resources 文件夹被删除后需新建  if (!file.exists() && workspaceRootPath.endsWith("resources")) {   return file.mkdir();  } else if (!file.exists()) {   return true;  }   return false;  } private static boolean deleteFile(File file) {  if (file.isDirectory()) {   File[] files = file.listFiles();   for (int i = 0; i < files.length; i++) {    deleteFile(files[i]);   }  }   return file.delete(); } }