IDEA 创建Servlet-HelloWorldServlet

1.创建空项目

2.配置web项目

3.配置Tomcat

4.加载Tomcat包

5.创建HelloWorldServlet类

public class controller extends HttpServlet {
    @Override
    //get请求
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    	//页面显示servlet
        resp.getWriter().println("servlet");
    }

    @Override
    //post请求
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    }
}

6.配置web.xml

<?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">
    <servlet>
<!--        java类路径别名-->
        <servlet-name>hello</servlet-name>
<!--        引入java类-->
        <servlet-class>com.lx.controller</servlet-class>
    </servlet>
    <servlet-mapping>
<!--        使用别名-->
        <servlet-name>hello</servlet-name>
<!--        浏览器资源路径-->
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>
</web-app>

7.运行