用idea做一个mongodb结合spring boot+html员工增删改查管理系统html+entity+service+controller

好的，我可以为你提供一个简单的示例代码，让你了解如何在Spring Boot中使用MongoDB。

首先，你需要在pom.xml文件中添加以下依赖项：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

接下来，创建一个Employee实体类：

@Document(collection = "employees")
public class Employee {

    @Id
    private String id;

    private String name;

    private String email;

    public Employee() {
    }

    public Employee(String name, String email) {
        this.name = name;
        this.email = email;
    }

    // 省略 getter 和 setter 方法
}

然后，创建一个EmployeeRepository接口，用于访问MongoDB数据库：

@Repository
public interface EmployeeRepository extends MongoRepository<Employee, String> {
}

接下来，创建一个EmployeeService类，以便在控制器中使用该类来访问MongoDB数据库：

@Service
public class EmployeeService {

    @Autowired
    private EmployeeRepository employeeRepository;

    public List<Employee> getAllEmployees() {
        return employeeRepository.findAll();
    }

    public Employee getEmployeeById(String id) {
        return employeeRepository.findById(id).orElse(null);
    }

    public Employee addEmployee(Employee employee) {
        return employeeRepository.insert(employee);
    }

    public Employee updateEmployee(String id, Employee employee) {
        Employee existingEmployee = employeeRepository.findById(id).orElse(null);
        if (existingEmployee != null) {
            existingEmployee.setName(employee.getName());
            existingEmployee.setEmail(employee.getEmail());
            return employeeRepository.save(existingEmployee);
        }
        return null;
    }

    public boolean deleteEmployee(String id) {
        Employee existingEmployee = employeeRepository.findById(id).orElse(null);
        if (existingEmployee != null) {
            employeeRepository.delete(existingEmployee);
            return true;
        }
        return false;
    }
}

最后，创建一个EmployeeController类来处理HTTP请求：

@RestController
@RequestMapping("/employees")
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @GetMapping("")
    public List<Employee> getAllEmployees() {
        return employeeService.getAllEmployees();
    }

    @GetMapping("/{id}")
    public Employee getEmployeeById(@PathVariable String id) {
        return employeeService.getEmployeeById(id);
    }

    @PostMapping("")
    public Employee addEmployee(@RequestBody Employee employee) {
        return employeeService.addEmployee(employee);
    }

    @PutMapping("/{id}")
    public Employee updateEmployee(@PathVariable String id, @RequestBody Employee employee) {
        return employeeService.updateEmployee(id, employee);
    }

    @DeleteMapping("/{id}")
    public boolean deleteEmployee(@PathVariable String id) {
        return employeeService.deleteEmployee(id);
    }
}

现在，你可以使用浏览器或Postman来测试你的REST API了。例如，发送一个POST请求到`http://localhost:8080/employees`，并在请求正文中包含以下JSON数据：

{
    "name": "John Doe",
    "email": "john.doe@example.com"
}

然后，发送一个GET请求到`http://localhost:8080/employees`，你应该能够看到所有添加的员工。

希望这个示例代码能够帮助你开始使用Spring Boot和MongoDB开发一个员工管理系统。