Servlet的实现

继承HttpServlet类

这是最常用的一种方式

package com.testservelet;

import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

@WebServlet("/s01")
public class Serlet01 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //控制台打印
        System.out.println("hi servlet");
        //响应给浏览器一句话
        resp.getWriter().write("hi servlet");
    }
}

实现Servlet抽象类

需要把所有抽象类里面所有的方法都重写

package main.java.servelet;

import jakarta.servlet.*;

import java.io.IOException;

public class servelet implements Servlet {
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {

    }

    @Override
    public ServletConfig getServletConfig() {
        return null;
    }

    //提供服务的方法
    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        System.out.println("Hello Servelet");
    }

    @Override
    public String getServletInfo() {
        return null;
    }

    @Override
    public void destroy() {

    }
}