javaweb -01

tomcat：下载安装。。。。：http://tomcat.apache.org/

 

 

 

 解压就好了。。。。。。。。。。。。。。。。。

IDEA集成tomcat：

 

 

 

 

 

 如果出现乱码：

 

 

 

 

重启。。再来。。。。。。。

 

 

 

 

第一个Servlet：

package com.gton.servlet;


import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @program: javaweb-tomcat
 * @description: servlet 学习
 * @author: GuoTong
 * @create: 2020-09-11 11:15
 **/

//第一种：
public class FirstServlet extends HttpServlet {
    public FirstServlet() {
        super();
    }

    @Override
    public void destroy() {
        System.out.println("容器被销毁了。。。");
    }

    @Override
    public void init() throws ServletException {
        System.out.println("Servlet   启动。。。。。");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        resp.setCharacterEncoding("UTF-8");
        req.setCharacterEncoding("UTF-8");
        PrintWriter out = resp.getWriter();//控制台显示输出对象
        out.print("<h1>Hello Servlet</h1>");
        out.flush();
        out.close();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

xml配置：

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--    web项目的配置文件-->

    <servlet>
        <servlet-name>test01</servlet-name>
        <servlet-class>com.gton.servlet.FirstServlet</servlet-class>
        <!--  指定Servlet的创建时机0或者正整数：服务器启动时就创建 负数：第一次被访问时创建(默认的方式)-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>test01</servlet-name>
        <url-pattern>/home</url-pattern>
    </servlet-mapping>
</web-app>