import java.io.IOException;

import jakarta.servlet.Servlet;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;

@WebServlet(value="/demo")
public class HelloServlet implements Servlet {

    //完成初始化的方法，默认情况下，servlet第一次被访问时调用，且只调用一次
    public void init(ServletConfig servletConfig) throws ServletException {
        System.out.println("innit-----------------------------------");

    }
    //销毁方法，内存释放时或者服务器关闭时会调用一次，且只能调用一次。
    public void destroy() {
        System.out.println("destroy-----------------------------------");

    }
    public ServletConfig getServletConfig() {
        System.out.println("getServletConfig-----------------------------------");
        return null;
    }
    public String getServletInfo() {
        System.out.println("getServletInfo-----------------------------------");
        return null;
    }

    //提供服务，每一次被访问是都会被访问
    public void service(ServletRequest arg0, ServletResponse arg1) throws ServletException, IOException {
        arg1.getWriter().write("hello world!");
        System.out.println("hello world-------------------------");
        
    }
}