学生管理系统 垃圾版
实行功能
代码目录
index页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>学生管理系统</title>
</head>
<body>
<a href="stu/addStudent.html">添加学生</a>
<a href="/stu/listStudentServlet">查看学生</a>
</body>
</html>
添加学生页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>添加学生</title>
</head>
<body>
<form action="/stu/addStuServlet" 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>
添加学生Servlet
package com.itheima.servlet;
import com.itheima.bean.Student;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;
/*
*
*实现添加功能
* */
@WebServlet("/addStuServlet")
public class AddStudentServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1.获取表单中的数据
String username=req.getParameter("username");
String age=req.getParameter("age");
String score = req.getParameter("score");
//2.创建学生对象并赋值
Student stu=new Student();
stu.setUsername(username);
stu.setAge(Integer.parseInt(age));
stu.setScore(Integer.parseInt(score));
//3.将学生对象的数据保存到d:\\stu.txt中
BufferedWriter bw=new BufferedWriter(new FileWriter("d:\\stu.txt",true));
bw.write(stu.getUsername()+","+stu.getAge()+","+stu.getScore());
bw.newLine();
bw.close();
//通过定时刷新功能相应给浏览器
resp.setContentType("text/html;charset=UTF-8");
resp.getWriter().write("添加成功。2秒后自动跳转到首页");
resp.setHeader("Refresh","2;URL=/stu/index.html");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
学生实体类
package com.itheima.bean;
public class Student {
private String username;
private int age;
private int score;
public Student() {
}
public Student(String username, int age, int score) {
this.username = username;
this.age = age;
this.score = score;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
@Override
public String toString() {
return "Student{" +
"username='" + username + '\'' +
", age=" + age +
", score=" + score +
'}';
}
}
展示学生Servlet
package com.itheima.servlet;
import com.itheima.bean.Student;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
/**
* 实现查看功能
* */
@WebServlet("/listStudentServlet")
public class ListStudentServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1.创建一个字符输入流对象，关联读取的文件
BufferedReader br=new BufferedReader(new FileReader("d:\\stu.txt"));
//2.创建集合对象，保存Student对象
ArrayList<Student> list=new ArrayList<>();
//3.循环读取文件中的数据，将数据封装到Student对象中，在把多个对象添加到集合中
String line;
while((line= br.readLine())!=null){
//张三,23,90
Student stu=new Student();
String[] split = line.split(",");
stu.setUsername(split[0]);
stu.setAge(Integer.parseInt(split[1]));
stu.setScore(Integer.parseInt(split[2]));
list.add(stu);
}
//4.遍历集合，将数据响应给浏览器
resp.setContentType("text/html;charset=UTF-8");
//获取输出流对象
PrintWriter pw = resp.getWriter();
for(Student s:list){
pw.write(s.getUsername()+","+s.getAge()+","+s.getScore());
pw.write("<br>");
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
