Java教程

Spring Boot + MySQL 快速搭建管理系统，不能太容易了！

本文主要是介绍Spring Boot + MySQL 快速搭建管理系统，不能太容易了！，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

来源：blog.csdn.net/weixin_44671737/article/details/112341805

摘要

对企业来说，人、物资、能源、资金、信息是5大重要资源。人、物资、能源、资金这些都是可见的有形资源，而信息是一种无形的资源。以前人们比较看重有形的资源，进入信息社会和知识经济时代以后，信息资源就显得日益重要。

因为信息资源决定了如何更有效地利用物资资源。信息资源是人类与自然的斗争中得出的知识结晶，掌握了信息资源，就可以更好地利用有形资源，使有形资源发挥更好的效益。

由此可见，诸如各类管理系统还是很有价值的，笔者经历的公司内部都有自己实现的管理系统，可能有些非互联网的公司是依靠其他公司提供的信息管理服务，ERP系统至今还发挥着重要作用，笔者下班后连忙带赶，经历数个小时的鏖战，终于做完了此xx管理系统，在此与诸位分享。

1 技术选型

1.1 Mysql8

为什么是mysql8，不是5版本的。没错就是喜新厌旧啦！！！

mysql8有何特别之处呢！

1.性能就是好，没错它就是强，所以当然上Mysql8，快点上8。

2.Mysql8还支持各种牛逼的功能：SQL窗口函数，GIS，JSON扩展语法等等。总之这些功能听着就挺牛，由于笔者自己还没弄明白，就不赘述了。

1.2 springboot2

当前主流的web开发框架，不二之选，没有比这更方便的了，为什么选这个，它就是无敌，没有竞争对手啊。自动装配，父级依赖，嵌入tomcat等等，就是无敌呀。

Spring Boot 基础就不介绍了，推荐下这个实战教程：
https://github.com/javastacks/spring-boot-best-practice

1.3 模板引擎thymeleaf

用模板引擎也实属无奈，笔者不会前端呀，毕竟人的精力是有限的。不过这个东西还是挺好用的，赶脚用着和几年前学写jsp也差不多。

2 项目构建

2.1 创建项目

spring initializer

取个心爱的项目名字

勾选需要的依赖，mysql，thymeleaf，jpa

2.2 建表

好吧，笔者为了偷懒，没有建表ddl，直接上jpa，先建一个需要的库，create database。做完这些，项目开始的准备工作就已经完了，马上又带了激动人心的撸代码环节了。

3 项目实现

3.1 项目效果

主页面

就是这样滴，如此就已然发挥了笔者百分之两百的前端功力了，各种查阅资料，复制copy加代码修改，修修改改终于有了上边的模样，应该不算太丑吧！好吧，我承认了。

3.2 项目结构

和主流web开发项目的结构基本大同小异：

对应数据库实体的entity包，对应数据库操作的repo目录，对应业务代码的service目录，对应restful api的controller目录。

4 代码实现

4.1 前台页面

首页面，就是上边看到的那个帅气的首页！

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <meta charset="UTF-8">
    <title>xx-manager</title>
</head>
<body>
<header th:replace="xx-header.html"></header>
<div class="container my-2">
    <a th:href="@{/newEmployee}" class="btn btn-primary btn-sm mb-3"> 新增 </a>
    <table border="1" class = "table table-striped table-responsive-md">
        <thead>
        <tr>
            <th>姓名</th>
            <th>邮箱</th>
            <th>电话</th>
            <th>地址</th>
            <th>操作</th>
        </tr>
        </thead>
        <tbody>
        <tr th:each="employee : ${employees}">
            <td th:text="${employee.name}"></td>
            <td th:text="${employee.email}"></td>
            <td th:text="${employee.mobile}"></td>
            <td th:text="${employee.location}"></td>
            <td><a th:href="@{/updateEmployee/{id}(id=${employee.id})}" class="btn btn-primary">修改</a>
                <a th:href="@{/deleteEmployee/{id}(id=${employee.id})}" class="btn btn-danger">删除</a></td>
        </tr>
        </tbody>
    </table>

    <div th:if="${totalPages > 1}">
        <div class="row col-sm-10">
            <div class="col-sm-2">
                总人数: [[${items}]]
            </div>
            <div class="col-sm-1">
                    <span th:each="i: ${#numbers.sequence(1, totalPages)}">
      <a th:if="${currentPage != i}" th:href="@{'/page/' + ${i}}">[[${i}]]</a>
      <span th:unless="${currentPage != i}">[[${i}]]</span> &nbsp; &nbsp;
                    </span>
            </div>
            <div class="col-sm-1">
                <a th:if="${currentPage < totalPages}" th:href="@{'/page/' + ${currentPage + 1}}">下一页</a>
                <span th:unless="${currentPage < totalPages}">下一页</span>
            </div>

            <div class="col-sm-1">
                <a th:if="${currentPage < totalPages}" th:href="@{'/page/' + ${totalPages}}">尾页</a>
                <span th:unless="${currentPage < totalPages}">尾页</span>
            </div>
        </div>
    </div>
</div>
<footer th:replace="footer.html"></footer>
</body>
</html>

新增功能页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <meta charset="UTF-8">
    <title>xx-manager</title>
</head>
<body>
<header th:replace="xx-header.html"></header>
<div class="container">
    <h1>xx-manager</h1>
    <hr>
    <h2>保存</h2>

    <form action="#" th:action="@{/saveEmployee}" th:object="${employee}" method="POST">
        <input type="text" th:field="*{name}" placeholder="姓名" class="form-control mb-4 col-4">

        <input type="text" th:field="*{email}" placeholder="邮箱" class="form-control mb-4 col-4">

        <input type="text" th:field="*{mobile}" placeholder="电话" class="form-control mb-4 col-4">

        <input type="text" th:field="*{location}" placeholder="住址" class="form-control mb-4 col-4">

        <button type="submit" class="btn btn-info col-2">保存</button>
    </form>

    <hr>

    <a th:href="@{/}">回退</a>
</div>
<footer th:replace="footer.html"></footer>
</body>
</html>

修改功能页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <meta charset="UTF-8">
    <title>xx-manager</title>
</head>
<body>
<header th:replace="xx-header.html"></header>
<div class="container">
    <h1>xx-manager</h1>
    <hr>
    <h2>更新</h2>

    <form action="#" th:action="@{/saveEmployee}" th:object="${employee}" method="POST">

        <input type="hidden" th:field="*{id}" />

        <input type="text" th:field="*{name}" class="form-control mb-4 col-4">

        <input type="text" th:field="*{email}" class="form-control mb-4 col-4">

        <input type="text" th:field="*{mobile}" class="form-control mb-4 col-4">

        <input type="text" th:field="*{location}" class="form-control mb-4 col-4">

        <button type="submit" class="btn btn-info col-2">修改</button>

    </form>

    <hr>

    <a th:href="@{/}">回退</a>
</div>
<footer th:replace="footer.html"></footer>
</body>
</html>

4.2 后台业务实现

4.2.1 实体类Employee

对应数据库中的表

package com.lbh.xxmanager.entity;

import javax.persistence.*;

/**
 * Copyright(c)lbhbinhao@163.com
 * @author liubinhao
 * @date 2021/1/7
 * ++++ ______                           ______             ______
 * +++/     /|                         /     /|           /     /|
 * +/_____/  |                       /_____/  |         /_____/  |
 * |     |   |                      |     |   |        |     |   |
 * |     |   |                      |     |   |________|     |   |
 * |     |   |                      |     |  /         |     |   |
 * |     |   |                      |     |/___________|     |   |
 * |     |   |___________________   |     |____________|     |   |
 * |     |  /                  / |  |     |   |        |     |   |
 * |     |/ _________________/  /   |     |  /         |     |  /
 * |_________________________|/b    |_____|/           |_____|/
 */
@Entity
@Table(name = "xx_employee")
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    @Column(name = "name")
    private String name;
    @Column(name = "email")
    private String email;
    @Column(name = "mobile")
    private String mobile;
    @Column(name = "location")
    private String location;
    @Column(name="status")
    private int status;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }
}

4.2.2 数据库操作层repo

package com.lbh.xxmanager.repo;

import com.lbh.xxmanager.entity.Employee;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * Copyright(c)lbhbinhao@163.com
 * @author liubinhao
 * @date 2021/1/7
 * ++++ ______                           ______             ______
 * +++/     /|                         /     /|           /     /|
 * +/_____/  |                       /_____/  |         /_____/  |
 * |     |   |                      |     |   |        |     |   |
 * |     |   |                      |     |   |________|     |   |
 * |     |   |                      |     |  /         |     |   |
 * |     |   |                      |     |/___________|     |   |
 * |     |   |___________________   |     |____________|     |   |
 * |     |  /                  / |  |     |   |        |     |   |
 * |     |/ _________________/  /   |     |  /         |     |  /
 * |_________________________|/b    |_____|/           |_____|/
 */
@Repository
public interface EmployeeRepository extends JpaRepository<Employee,Long> {

    List<Employee> findAllByStatus(int status);

    Page<Employee> findAllByStatus(int status, Pageable pageable);

    Page<Employee> findAllByStatusAndLocationLikeOrNameLikeOrEmailLike(int status,String locaion,String name,String email, Pageable pageable);

}

4.2.3 业务代码service

接口：

package com.lbh.xxmanager.service;

import com.lbh.xxmanager.entity.Employee;
import org.springframework.data.domain.Page;

import java.util.List;

/**
 * Copyright(c)lbhbinhao@163.com
 * @author liubinhao
 * @date 2021/1/7
 * ++++ ______                           ______             ______
 * +++/     /|                         /     /|           /     /|
 * +/_____/  |                       /_____/  |         /_____/  |
 * |     |   |                      |     |   |        |     |   |
 * |     |   |                      |     |   |________|     |   |
 * |     |   |                      |     |  /         |     |   |
 * |     |   |                      |     |/___________|     |   |
 * |     |   |___________________   |     |____________|     |   |
 * |     |  /                  / |  |     |   |        |     |   |
 * |     |/ _________________/  /   |     |  /         |     |  /
 * |_________________________|/b    |_____|/           |_____|/
 */
public interface EmployeeService {

    List<Employee> findAllEmployees();

    void saveEmployee(Employee employee);

    Employee getEmployeeById(long id);

    void deleteEmployeeById(long id);

    Page<Employee> findPaging(int no,int size);

    Page<Employee> findPaging(int no,int size,String searchKey);
}

业务实现类：

package com.lbh.xxmanager.service;

import com.lbh.xxmanager.entity.Employee;
import com.lbh.xxmanager.repo.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Optional;

/**
 * Copyright(c)lbhbinhao@163.com
 *
 * @author liubinhao
 * @date 2021/1/7
 * ++++ ______                           ______             ______
 * +++/     /|                         /     /|           /     /|
 * +/_____/  |                       /_____/  |         /_____/  |
 * |     |   |                      |     |   |        |     |   |
 * |     |   |                      |     |   |________|     |   |
 * |     |   |                      |     |  /         |     |   |
 * |     |   |                      |     |/___________|     |   |
 * |     |   |___________________   |     |____________|     |   |
 * |     |  /                  / |  |     |   |        |     |   |
 * |     |/ _________________/  /   |     |  /         |     |  /
 * |_________________________|/b    |_____|/           |_____|/
 */
@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeRepository employeeRepository;

    @Override
    public List<Employee> findAllEmployees() {
        return employeeRepository.findAllByStatus(0);
    }

    @Override
    public void saveEmployee(Employee employee) {
        employee.setStatus(0);
        employeeRepository.save(employee);
    }

    @Override
    public Employee getEmployeeById(long id) {
        Optional<Employee> byId = employeeRepository.findById(id);
        Employee employee = null;
        if (byId.isPresent()){
            employee = byId.get();
        }else {
            throw new RuntimeException("该id员工不存在!");
        }
        return employee;
    }

    @Override
    public void deleteEmployeeById(long id) {
        Employee employeeById = getEmployeeById(id);
        employeeById.setStatus(1);
        employeeRepository.save(employeeById);
    }

    @Override
    public Page<Employee> findPaging(int no, int size) {
        Pageable pageable = PageRequest.of(no - 1,size);
        return employeeRepository.findAllByStatus(0,pageable);
    }

    @Override
    public Page<Employee> findPaging(int no, int size, String searchKey) {
        String key = "%"+searchKey+"%";
        Pageable pageable = PageRequest.of(no - 1,size);
        return employeeRepository.findAllByStatusAndLocationLikeOrNameLikeOrEmailLike(0,key,key,key,pageable);
    }
}

4.2.4 Web接口

package com.lbh.xxmanager.controller;

import com.lbh.xxmanager.entity.Employee;
import com.lbh.xxmanager.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.thymeleaf.util.StringUtils;

import java.util.List;

/**
 * Copyright(c)lbhbinhao@163.com
 * @author liubinhao
 * @date 2021/1/7
 * ++++ ______                           ______             ______
 * +++/     /|                         /     /|           /     /|
 * +/_____/  |                       /_____/  |         /_____/  |
 * |     |   |                      |     |   |        |     |   |
 * |     |   |                      |     |   |________|     |   |
 * |     |   |                      |     |  /         |     |   |
 * |     |   |                      |     |/___________|     |   |
 * |     |   |___________________   |     |____________|     |   |
 * |     |  /                  / |  |     |   |        |     |   |
 * |     |/ _________________/  /   |     |  /         |     |  /
 * |_________________________|/b    |_____|/           |_____|/
 */
@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @GetMapping("/")
    public String index(Model model){
        model.addAttribute("employees",employeeService.findAllEmployees());
        return "redirect:/page/1";
    }

    @GetMapping("/newEmployee")
    public String newEmployee(Model model){
        Employee employee = new Employee();
        model.addAttribute("employee",employee);
        return "new_employee";
    }

    @PostMapping("/saveEmployee")
    public String saveEmployee(@ModelAttribute Employee employee){
        employeeService.saveEmployee(employee);
        return "redirect:/";
    }

    @GetMapping("/updateEmployee/{id}")
    public String updateEmployee(@PathVariable Long id,Model model){
        Employee employeeById = employeeService.getEmployeeById(id);
        model.addAttribute("employee",employeeById);
        return "update_employee";
    }

    @GetMapping("/deleteEmployee/{id}")
    public String deleteEmployee(@PathVariable Long id){
        employeeService.deleteEmployeeById(id);
        return "redirect:/";
    }

    @GetMapping("/page/{pageNo}")
    public String findPaging(@PathVariable int pageNo, @RequestParam(required = false) String key, Model model){
        Page<Employee> paging = null;
        if (StringUtils.isEmpty(key)) {
            paging = employeeService.findPaging(pageNo, 5);
        }
        else{
            paging = employeeService.findPaging(pageNo, 5,key);
        }
        List<Employee> content = paging.getContent();
        model.addAttribute("currentPage",pageNo);
        model.addAttribute("totalPages",paging.getTotalPages());
        model.addAttribute("items",paging.getTotalElements());
        model.addAttribute("employees",content);
        return "index";
    }
}

4.3 配置文件

springboot的配置文件

server.port=9001
spring.datasource.username=root
spring.datasource.password=你的数据库密码
spring.datasource.url=jdbc:mysql://localhost:3303/xx-manager?serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=CONVERT_TO_NULL&autoReconnect=true&useSSL=false&failOverReadOnly=false

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
# update 这样写可以自动建表，更新表
# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto=update

logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type=TRACE

5 总结

写一个这样简单的后台信息管理还是不难，看来笔者还是宝刀未老。下班回家开始做，不过写博客是真滴难，都过了12点还没有写

完，写博客和我写代码的时间也相差无几了。哎，我这可怜的头发啊。

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2.劲爆！Java 协程要来了。。。

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