Java中如何让web服务器启动的时候自动运行web程序中某个类的某个方法
1，新建一个java的Servlet，我这里直接贴上我测试成功的脚本
package com.pinao.dao;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/GetComputerCode")
public class GetComputerCode extends HttpServlet {
static {
System.out.println("YYYYYYYYYYYYYYYYYYYYYYYYYYY");
}
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public GetComputerCode() {
super();
}
public void init() throws ServletException {
super.init();
System.out.println("..................这样在web容器启动的时候，就会执行这句话了！");
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
2，在项目的WebRoot/WEB-INF/web.xml 中，添加
<servlet>
<servlet-name>GetComputerCode</servlet-name>
<servlet-class>com.pinao.dao.GetComputerCode</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
下面是我的测试的xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>JudgeDeadTime</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>GetComputerCode</servlet-name>
<servlet-class>com.pinao.dao.GetComputerCode</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
</web-app>
3，运行Tomcat，发现在Servlet中的Static中的打印“YYYYYYYYYYYYYYYY”和Init中的方法都执行了