Servlet

HelloServlet
1.新建一个maven项目作为父项目（删掉src）

2.新建一个子模块，以webapp为模板

• 模块中main文件夹中新建java和resources文件夹并标记 功能

3.修改web.xml为最新的版本

<?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"
         metadata-complete="true">
  <!--注册servlet-->
</web-app>

4.编写servlet程序
4.1java类

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;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer = resp.getWriter();
        writer.println("Hello Servlet");

    }

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

4.2Servlet映射
需要在web服务中注册我们的Servlet，并给浏览器一个可以访问的路径

  <!--注册servlet-->
  <servlet>
    <servlet-name>helloServlet</servlet-name>
    <servlet-class>com.liu.servlet.HelloServlet</servlet-class>
  </servlet>
<!--  映射，以及请求路径-->
  <servlet-mapping>
    <servlet-name>helloServlet</servlet-name>
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>

5.配置Tomcat
注意配置项目发布的路径即可
6.测试