学生管理系统VueAjax版本
使用Vue和Ajax对原有学生管理系统进行优化
1.准备工作
创建AjaxResult类,对Ajax回传的信息封装在对象中
java
package com.grg.Result;
/**
* @Author Grg
* @Date 2023/8/30 8:51
* @PackageName:com.grg.Result
* @ClassName: AjaxResult
* @Description: 又是码代码的一天
* @Version plus max 宇宙无敌终极版本
*/
public class AjaxResult {
private Integer code;
private String msg;
private Object data;
public static AjaxResult success() {
return new AjaxResult(1, "成功", null);
}
public static AjaxResult success(Object data) {
return new AjaxResult(1, "成功", data);
}
public static AjaxResult error() {
return new AjaxResult(2, "失败", null);
}
public AjaxResult() {
}
public AjaxResult(Integer code, String msg, Object data) {
this.code = code;
this.msg = msg;
this.data = data;
}
@Override
public String toString() {
return "AjaxResult{" +
"code=" + code +
", msg='" + msg + '\'' +
", data=" + data +
'}';
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
}
JDBC工具类DAOUtil
java
package com.grg.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @Author Grg
* @Date 2023/8/26 14:35
* @PackageName:com.grg.util
* @ClassName: DAOUtil
* @Description: 又是码代码的一天
* @Version plus max 宇宙无敌终极版本
*/
public class DAOUtil {
//消除魔法值
private static final String CLASSNAME = "com.mysql.cj.jdbc.Driver";
private static final String URL = "jdbc:mysql:///jdbctest";
private static final String USERNAME = "root";
private static final String PASSWORDS = "123456";
//加载驱动
static {
try {
Class.forName(CLASSNAME);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
//建立连接
public static Connection getConnection() throws Exception {
return DriverManager.getConnection(URL, USERNAME, PASSWORDS);
}
//增删改
public static int executeUpdate(String sql, Object... data) {
Connection conn = null;
try {
conn = DAOUtil.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
for (int i = 0; i < data.length; i++) {
ps.setObject(i + 1, data[i]);
}
return ps.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (conn != null) {
conn.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return 0;
}
//查
public static List<Map<String, Object>> executeQuery(String sql, Object... arr) {
List<Map<String, Object>> data = new ArrayList<>();
Connection conn = null;
try {
conn = DAOUtil.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
for (int i = 0; i < arr.length; i++) {
ps.setObject(i + 1, arr[i]);
}
ResultSet set = ps.executeQuery();
int columnCount = set.getMetaData().getColumnCount();
while (set.next()) {
HashMap<String, Object> map = new HashMap<>();
for (int i = 0; i < columnCount; i++) {
map.put(set.getMetaData().getColumnLabel(i + 1), set.getObject(i + 1));
}
data.add(map);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (conn != null) {
conn.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return data;
}
}
pom文件
java
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>StudentVue</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>StudentVue Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>2.0.2</version>
</dependency>
</dependencies>
<build>
<finalName>StudentVue</finalName>
</build>
</project>
2.登录模块
登录页面(默认页面)index.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css"
integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<style>
fieldset {
margin: 100px auto;
width: 500px;
}
</style>
</head>
<body>
<div id="app">
<fieldset>
<legend>登录</legend>
<span class="label label-danger">{{msg}}</span>
<div class="form-group">
<label>UserName</label>
<input class="form-control" placeholder="请输入账号" v-model="info.username">
</div>
<div class="form-group">
<label>Password</label>
<input type="password" class="form-control" placeholder="请输入密码" v-model="info.password">
</div>
<button type="submit" class="btn btn-danger btn-block" @click="login()">登录</button>
</fieldset>
</div>
<script>
var haha = new Vue({
el: "#app",
data: {
info: {},
msg: "",
},
methods: {
login: function () {
//数据校验
//发送请求
$.post("/day/emp/login", haha.info, function (backData) {
if (backData.code == 1) {
//跳转主界面
window.location.href = "/day/main.html"
} else {
//显示失败信息
haha.msg = "对不起账号或密码错误"
}
})
}
}
})
</script>
</body>
</html>
对/day/emp/login发送post请求,查询数据并且回传
EmpServlet类 拦截到/emp/*的请求并进行处理
创建dao层 EmpDAO类和EmpDAOImpl实现类 实现对数据库中数据进行账号密码验证
EmpDAO接口
java
public interface EmpDAO {
List<Map<String,Object>> login(String username, String password);
}
EmpDAO实现类
java
public class EmpDAOImpl implements EmpDAO {
@Override
public List<Map<String, Object>> login(String username, String password) {
String sql = "select * from login where username = ? and password = ? ";
return DAOUtil.executeQuery(sql, username, password);
}
}
EmpServlet类
java
package com.grg.servlet;
import com.alibaba.fastjson.JSON;
import com.grg.Result.AjaxResult;
import com.grg.dao.EmpDAO;
import com.grg.dao.impl.EmpDAOImpl;
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.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
/**
* @Author Grg
* @Date 2023/8/30 8:49
* @PackageName:com.grg.servlet
* @ClassName: EmpServlet
* @Description: 又是码代码的一天
* @Version plus max 宇宙无敌终极版本
*/
@WebServlet("/emp/*")
public class EmpServlet extends HttpServlet {
private EmpDAO empDAO = new EmpDAOImpl();
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//路径分发
String uri = req.getRequestURI();
String[] arr = uri.split("/");
String s = arr[arr.length - 1];
resp.setContentType("text/json;charset=UTF-8");
PrintWriter out = resp.getWriter();
AjaxResult ajaxResult = null;
if ("login".equals(s)) {
ajaxResult = login(req, resp);
}
String s1 = JSON.toJSONString(ajaxResult);
out.write(s1);
}
protected AjaxResult login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1.接收请求参数
String username = req.getParameter("username");
String password = req.getParameter("password");
//2.校验账号密码
List<Map<String, Object>> data = empDAO.login(username, password);
if (data.size() > 0) {
return AjaxResult.success();
}
return AjaxResult.error();
}
}
当账号密码错误时,响应 {"code":2,"msg":"失败"}
当账号密码正确时,进入main.html
java
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>信息管理系统</title>
<link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css"
integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<style>
body {
background: url('./img/reg_bg_min.jpg') no-repeat;
background-size: 100% 100%;
}
a {
text-decoration: none;
color: white;
}
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
}
#header {
background-color: #000000;
/*color: #ffffff;*/
padding: 10px;
display: flex;
justify-content: space-between;
}
#header h1, #header p {
margin: 0;
}
#sidebar {
/*background-color: #e1e1e1;*/
width: 200px;
height: 100vh;
float: left;
}
#content {
padding: 20px;
margin-left: 200px;
}
#footer {
/*background-color: #f5f5f5;*/
padding: 10px;
clear: both;
}
.menu-item {
padding: 10px;
margin-top: 10px;
}
.menu-item:hover {
background-color: #d1d1d1;
}
#iframe-container {
width: calc(100% - 20px);
height: calc(100vh - 20px);
}
#iframe-content {
width: 100%;
height: 100%;
border: none;
}
</style>
</head>
<body>
<div id="header">
<!-- 学生管理系统的Logo和标题 -->
<h1 style="color:white;">信息管理系统</h1>
<!-- 用户信息和注销按钮 -->
<p style="color:white;">当前登录用户:</p>
</div>
<div id="sidebar">
<!-- 左侧菜单 -->
<div class="menu-item">
<a target="haha" href="/day/views/student/list.html">学生管理</a>
</div>
<div class="menu-item">
<a target="haha" href="/teacher/show">教师管理</a>
</div>
<div class="menu-item">
<a target="haha" href="/class/show">班级管理</a>
</div>
<div class="menu-item">
<a target="haha" href="/views/emp/changepassword.jsp">修改密码</a>
</div>
<div class="menu-item">
<a target="haha" href="/log">日志记录</a>
</div>
<div class="menu-item">
<a href="/">注销</a>
</div>
</div>
<div id="content">
<div id="iframe-container">
<iframe name="haha" src="" id="iframe-content"></iframe>
</div>
</div>
<div id="footer">
<!-- 页面底部区域,可根据需求添加内容 -->
<p style="color:white;">版权所有 © 2023 学生管理系统</p>
</div>
</body>
</html>
3.学生管理
3.1查询学生
点击学生管理获取学生数据并且展示在页面上
java
<a target="haha" href="/day/views/student/list.html">学生管理</a>
创建list.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css"
integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<body>
<div id="app">
<a href="/day/views/student/add.html" class="btn btn-success">添加学生</a>
<table class="table table-bordered table-condensed table-striped">
<tr>
<th>编号</th>
<th>姓名</th>
</tr>
<tr v-for="(s,i) in stuArr">
<td>{{s.id}}</td>
<td>{{s.name}}</td>
<td>
<button class="btn btn-danger" @click="delStu(s.id)">删除</button>
<button class="btn btn-primary">修改</button>
</td>
</tr>
</table>
</div>
<script>
$.get("/day/stu/list", function (backData) {
haha.stuArr = backData.data;
})
var haha = new Vue({
el: "#app",
data: {
stuArr: []
},
methods: {
delStu: function (a) {
if (confirm("确定删除?")) {
$.get("/day10/stu/delete?id=" + a, function (backDate) {
if (backDate.code == 2) {
alert("删除失败")
} else {
window.location.reload();
}
})
}
}
}
});
</script>
</body>
</html>
进入页面后通过ajax获取学生数据,并把返回的数据存入haha.stuArr数组中
javascript
$.get("/day/stu/list", function (backData) {
haha.stuArr = backData.data;
})
/day/stu/list执行list函数
创建StudentServlet类、StudentDAO接口、StudentDAOImpl实现类
StudentDAO接口
java
public interface StudentDAO {
public List<Map<String, Object>> listAllStudent();
public int deleteStudentById(String id);
}
StudentDAOImpl实现类
java
public class StudentDAOImpl implements StudentDAO {
@Override
public List<Map<String, Object>> listAllStudent() {
String sql = "select s.id,s.name from student s";
return DAOUtil.executeQuery(sql);
}
@Override
public int deleteStudentById(String id) {
String sql = "delete from student where id = ? ";
return DAOUtil.executeUpdate(sql, id);
}
}
StudentServlet类
java
package com.grg.servlet;
import com.alibaba.fastjson.JSON;
import com.grg.Result.AjaxResult;
import com.grg.dao.StudentDAO;
import com.grg.dao.impl.StudentDAOImpl;
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.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
/**
* @Author Grg
* @Date 2023/8/30 8:49
* @PackageName:com.grg.servlet
* @ClassName: StudentServlet
* @Description: 又是码代码的一天
* @Version plus max 宇宙无敌终极版本
*/
@WebServlet("/stu/*")
public class StudentServlet extends HttpServlet {
private StudentDAO studentDAO = new StudentDAOImpl();
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String uri = req.getRequestURI();
String[] arr = uri.split("/");
String s = arr[arr.length - 1];
resp.setContentType("text/json;charset=UTF-8");
PrintWriter out = resp.getWriter();
AjaxResult ajaxResult = null;
if ("list".equals(s)) {
ajaxResult = list(req, resp);
} else if ("delete".equals(s)) {
ajaxResult = delete(req, resp);
}
String s1 = JSON.toJSONString(ajaxResult);
out.write(s1);
}
protected AjaxResult list(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
List<Map<String, Object>> list = studentDAO.listAllStudent();
return AjaxResult.success(list);
}
protected AjaxResult delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String id = req.getParameter("id");
int i = studentDAO.deleteStudentById(id);
if (i > 0) {
return AjaxResult.success();
}
return AjaxResult.error();
}
}
3.2删除学生
点击删除按钮 执行点击事件函数delStu
在StudentServlet中执行删除
html
<button class="btn btn-danger" @click="delStu(s.id)">删除</button>
js
methods: {
delStu: function (a) {
if (confirm("确定删除?")) {
$.get("/day/stu/delete?id=" + a, function (backDate) {
if (backDate.code == 2) {
alert("删除失败")
} else {
window.location.reload();
}
})
}
}
}
3.3添加学生
html
<a href="/day/views/student/add.html" class="btn btn-success">添加学生</a>
add.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css"
integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<style>
fieldset {
width: 500px;
margin: 100px auto;
}
</style>
<body>
<div id="app">
<fieldset>
<legend>添加学生
<span class="label label-primary"></span>
</legend>
<div class="form-group">
<label for="inputEmail3" class="col-sm-2 control-label">学生姓名</label>
<div class="col-sm-10">
<input name="name" v-model="stuInfo.name" type="text" class="form-control" id="inputEmail3"
placeholder="请输入学生姓名">
</div>
</div>
<div class="form-group">
<label for="inputPassword3" class="col-sm-2 control-label">学生年龄</label>
<div class="col-sm-10">
<input name="age" v-model="stuInfo.age" type="text" class="form-control" id="inputPassword3"
placeholder="请输入学生年龄">
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label">学生住址</label>
<div class="col-sm-10">
<select name="address" v-model="stuInfo.address">
<option>北京</option>
<option>郑州</option>
<option>上海</option>
</select>
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label">学生班级</label>
<div class="col-sm-10">
<select name="address" v-model="stuInfo.gid">
<option value="1">一年级</option>
<option value="2">二年级</option>
<option value="3">三年级</option>
</select>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-default btn-success" @click="add()">添加</button>
</div>
</div>
</fieldset>
</div>
<script>
var haha = new Vue({
el: "#app",
data: {
stuInfo: {},
},
methods: {
add: function () {
$.post("/day/stu/addStu", haha.stuInfo, function (backData) {
})
}
}
})
</script>
</body>
</html>
执行添加操作,在StudentServlet中执行addStu函数,并且编写DAO层相应添加函数
javascript
$.post("/day/stu/add", haha.stuInfo, function (backData) {
java
@Override
public int addStu(Student student) {
String sql = "insert into student values (null,?,?,?,?)";
return DAOUtil.executeUpdate(sql,student.getName(),student.getAge(),student.getAddress(),student.getGid());
}
java
protected AjaxResult addStu(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name = req.getParameter("name");
String age = req.getParameter("age");
String address = req.getParameter("address");
String gid = req.getParameter("gid");
Student student = new Student(name, age,address,Integer.parseInt(gid));
int i = studentDAO.addStu(student);
if (i > 0) {
return AjaxResult.success();
}
return AjaxResult.error();
}
3.4修改学生
点击修改按钮执行点击事件updateStu函数
<button class="btn btn-primary" @click="updateStu(s.id)">修改</button>
javascript
updateStu: function (a) {
window.location.href = "/day/views/student/update.html?id=" + a;
}
update.html
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
<link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css"
integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
</head>
<style>
fieldset {
width: 500px;
margin: 100px auto;
}
.col-sm-10 {
width: 85.333333%;
}
.btn-block {
width: 63%;
}
</style>
<body>
<div id="app">
<fieldset>
<legend>修改学生
<span class="label label-primary">{{msg}}</span>
</legend>
<div>
<label class="col-sm-2 control-label">姓名</label>
<div class="col-sm-10">
<input type="text" class="form-control" v-model="stuInfo.name">
</div>
</div>
<div>
<label class="col-sm-2 control-label">年龄</label>
<div class="col-sm-10">
<input type="text" class="form-control" v-model="stuInfo.age">
</div>
</div>
<div>
<label class="col-sm-2 control-label">住址</label>
<div class="col-sm-10">
<select name="address" v-model="stuInfo.address">
<option>北京</option>
<option>郑州</option>
<option>上海</option>
</select>
</div>
</div>
<div>
<label class="col-sm-2 control-label">班级</label>
<div class="col-sm-10">
<select name="gid" v-model="stuInfo.gid">
<option value="1">一年级</option>
<option value="2">二年级</option>
<option value="3">三年级</option>
</select>
</div>
</div>
<div>
<div class="col-sm-offset-2 col-sm-10">
<button type="submit" class="btn btn-info btn-block" @click="update()">修改</button>
<a href="/day/views/student/list.html" class="btn btn-info btn-block">返回</a>
</div>
</div>
</fieldset>
</div>
<script>
var id = window.location.href.split("=")[1];
$.get("/day/stu/getStu?id=" + id, function (backData) {
haha.stuInfo = backData.data;
})
var haha = new Vue({
el: "#app",
data: {
stuInfo: {},
msg:""
},
methods: {
update: function () {
$.post("/day/stu/updateStu",haha.stuInfo,function (backData) {
haha.msg = backData.msg;
})
}
}
})
</script>
</body>
</html>
先发送请求到getStu
java
protected AjaxResult getStu(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String id = req.getParameter("id");
List<Map<String, Object>> data = studentDAO.getStudentById(id);
if (data.size() > 0) {
return AjaxResult.success(data.get(0));
} else {
return AjaxResult.error();
}
}
点击修改按钮发送请求到updateStu
java
protected AjaxResult updateStu(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name = req.getParameter("name");
String age = req.getParameter("age");
String address = req.getParameter("address");
String gid = req.getParameter("gid");
String id = req.getParameter("id");
Student student = new Student(Integer.parseInt(id), name, age, address, Integer.parseInt(gid));
int i = studentDAO.updateStu(student);
if (i > 0) {
return AjaxResult.success();
}
return AjaxResult.error();
}