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>
</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。
