servlet生命周期

1.当servlet第一次调用时，会出发init()函数，该函数会吧servlet实例加载到内存

2.然后调用service函数

3.当第二次访问该servlet时直接调用service函数

4.当web应用reload或者关闭tomcat或者关机都会去调用destory函数，该函数去销毁servlet

servlet生命周期

package com.wangzhi.servlet;

import java.io.IOException;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class Myfirst implements Servlet {
    // 销毁函数，内存中清除，调用一次
    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public ServletConfig getServletConfig() {
        // TODO Auto-generated method stub
        return null;
    }

    // 获取对象
    @Override
    public String getServletInfo() {
        // TODO Auto-generated method stub
        return null;
    }

    // 每次调用一次，servlet装载内存
    @Override
    public void init(ServletConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

    @Override
    public void service(ServletRequest req, ServletResponse res)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
res.setCharacterEncoding("utf-8");
System.out.println("hello,world!"+new java.util.Date());
res.getWriter().println("hello,world"+new java.util.Date()+" I want to fuck you"+req.getRemoteHost()+"<h1>Helloworkd!大家好才是真的好</h1>"
);

    }

}

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servlet生命周期

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