1.创建项目-webapp项目

2.在src下创建包，xom.liuboss.demo  servlet

  

package com.liuboss.demo;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/*@WebServlet("/ser01")*/
@WebServlet(name = "servlet01",value = {"/ser01"})
public class servlet01 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("hello servlet!!!");
        resp.getWriter().write("hello servlet!!!");
    }
}

启动tomact

浏览器输出   控制台输出

@WebServlet("/ser01")  浏览器访问路径

-------实现servlet的三种方法

package com.liuboss.demo;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/*@WebServlet("/ser01")*/
@WebServlet(name = "servlet01",value = {"/ser01"})
public class servlet01 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("hello servlet!!!");
        resp.getWriter().write("hello servlet!!!");
    }
}

02

package com.liuboss.demo;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/ser02")
public class servlet02 extends GenericServlet {

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        System.out.println("GenericServlet hello servlet!!!");
    }
}

03

package com.liuboss.demo;

import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;

@WebServlet("/ser03")
public class servlet03 implements Servlet {

    @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 {
        System.out.println("实现接口！！！");
    }

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

    @Override
    public void destroy() {

    }
}

控制台输出页面内容。