验证生命周期代码
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| package com.xiaoguan.learn;
import jakarta.servlet.*;
import java.io.IOException;
public class AServlet implements Servlet {
public AServlet(){
System.out.println("AServlet无参数执行了");
}
@Override
public void init(ServletConfig servletConfig) throws ServletException {
System.out.println("A init");
}
@Override
public ServletConfig getServletConfig() {
return null;
}
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
System.out.println("A service");
}
@Override
public String getServletInfo() {
return null;
}
@Override
public void destroy() {
System.out.println("A destory");
}
}
|
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| package com.xiaoguan.learn;
import jakarta.servlet.*;
import java.io.IOException;
public class BServlet implements Servlet {
public BServlet() {
System.out.println("BServlet执行了");
}
@Override
public void init(ServletConfig servletConfig) throws ServletException {
}
@Override
public ServletConfig getServletConfig() {
return null;
}
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
}
@Override
public String getServletInfo() {
return null;
}
@Override
public void destroy() {
}
}
|
Servlet在启动服务时不会new Servlet这个对象,调用时（网页访问时）才会new,后面进入初始化init执行一次，后面service只要刷新就会执行,可无限次执行，最后停止服务器时destory才执行。