Servlet—————————————————————————————————————————————————
    06尚硅谷_Servlet王振国 - 课堂笔记.pdf

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    1. <?xml version="1.0" encoding="UTF-8"?>
    2. <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    4.          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
    5.          version="4.0">
    6. <!-- servlet标签给tomcat配置servlet程序 -->
    7.    <servlet>
    8. <!-- servlet-name标签 servlet程序起一个别名(一般是类名) -->
    9.        <servlet-name>hello</servlet-name>
    10. <!-- servlet-class是servlet程序的全类名 -->
    11.        <servlet-class>com.example.demo2.hello</servlet-class>
    12.    </servlet>
    14. <!-- servlet-mapping标签给servlet程序配置访问地址 -->
    15. <servlet-mapping>
    16. <!-- servlet-name标签的作用是告诉服务器，我当前配置的地址给哪个servlet程序使用  -->
    17.     <servlet-name>hello</servlet-name>
    18. <!-- url-pattern标签配置访问地址
    19. /         斜杠在服务器解析的时候表示地址为http://ip:port/工程路径
    20. /hello     表示地址http://ip:port/工程路径/hello
    21. -->
    22.     <url-pattern>/hello</url-pattern>
    23. </servlet-mapping>

    运行结果
    image.png
    通过继承HttpServlet来实现servlet程序：
    ①

    1. package com.example.demo2;
    3. import javax.servlet.ServletException;
    4. import javax.servlet.http.HttpServletRequest;
    5. import javax.servlet.http.HttpServletResponse;
    6. import java.io.IOException;
    8. public class HelloServlet2 extends HelloServlet{
    9.     @Override
    10.     public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    11.         System.out.println("doGet方法");
    12.     }
    14.     @Override
    15.     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    16.         System.out.println("doPost方法");
    17.     }
    18. }

    ②在web.xml中配置

    1. <servlet>
    2.         <servlet-name>HelloServlet2</servlet-name>
    3.         <servlet-class>com.example.demo2.HelloServlet2</servlet-class>
    4.     </servlet>
    5.     <servlet-mapping>
    6.         <servlet-name>HelloServlet2</servlet-name>
    7.         <url-pattern>/hello2</url-pattern>
    8.     </servlet-mapping>

    ③在网页中进行测试

    1. <!DOCTYPE html>
    2. <html lang="en">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <title>Servlet测试</title>
    6. </head>
    7. <body>
    8. <form action="http://localhost:8080/demo2/hello2" method="get">
    9.   <input type="submit">
    10. </form>
    11. </body>
    12. </html>

    运行结果：
    image.png

    07尚硅谷_Servlet王振国 - 课堂笔记.pdf
    每次请求都会封装新的request

    常见请求和响应头-说明.pdf