学生管理系统-案例实现_写一个人物信息管理器,用户输入人的姓名和年龄,如果是12岁以下,就是儿童,12到-优快云博客

博客提及web.xml，结合标签可知与Java的Servlet相关，Servlet常用于后端处理请求，web.xml可对Servlet等进行配置，在Java Web开发中起重要作用，与前端也存在一定交互。

package com.itheima.servlet;

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

public class StudentServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取表单数据并保存到文件中
        String username = req.getParameter("username");
        String age = req.getParameter("age");
        String score = req.getParameter("score");
        /*采用字符输出流*/
        BufferedWriter bw=new BufferedWriter(new FileWriter("d:\\stu.txt",true));
        bw.write(username+","+age+","+score);
        bw.newLine();
        bw.close();
        //响应客户端浏览器
        PrintWriter pw=resp.getWriter();
        pw.println("save success");
        pw.close();
    }

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

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>保存学生信息</title>
</head>
<body>
<form action="/stu/studentServlet" method="get" autocomplete="off">
    学生姓名：<input type="text" name="username"/><br/>
    学生年龄：<input type="number" name="age"/><br/>
    学生成绩：<input type="number" name="score"/><br/>
    <button type="submit">保存</button>
</form>
</body>
</html>

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">

    <welcome-file-list>
        <welcome-file>/addStudent.html</welcome-file>
    </welcome-file-list>

    <servlet>
        <servlet-name>studentServlet</servlet-name>
        <servlet-class>com.itheima.servlet.StudentServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>studentServlet</servlet-name>
        <url-pattern>/studentServlet</url-pattern>
    </servlet-mapping>

</web-app>