用java为上述员工信息页面设计controller，service，dao，bean

好的，我可以为您提供一个基本的Java代码示例，用于设计员工信息页面的Controller、Service、DAO和Bean。请注意，这只是一个示例，实际应用可能需要根据具体需求进行修改和优化。以下是示例代码：

Employee.java（Bean）：

public class Employee {
    private int id;
    private String name;
    private int age;
    private String department;

    // 构造函数、getter和setter方法省略
}

EmployeeDao.java（DAO）：

public interface EmployeeDao {
    List<Employee> getAllEmployees();
    Employee getEmployeeById(int id);
    void addEmployee(Employee employee);
    void updateEmployee(Employee employee);
    void deleteEmployee(int id);
}

EmployeeDaoImpl.java（DAO实现）：

public class EmployeeDaoImpl implements EmployeeDao {
    private List<Employee> employeeList = new ArrayList<>(); // 假设员工数据存储在List中

    @Override
    public List<Employee> getAllEmployees() {
        return employeeList;
    }

    @Override
    public Employee getEmployeeById(int id) {
        for (Employee employee : employeeList) {
            if (employee.getId() == id) {
                return employee;
            }
        }
        return null;
    }

    @Override
    public void addEmployee(Employee employee) {
        employeeList.add(employee);
    }

    @Override
    public void updateEmployee(Employee employee) {
        for (Employee emp : employeeList) {
            if (emp.getId() == employee.getId()) {
                emp.setName(employee.getName());
                emp.setAge(employee.getAge());
                emp.setDepartment(employee.getDepartment());
                break;
            }
        }
    }

    @Override
    public void deleteEmployee(int id) {
        Iterator<Employee> iterator = employeeList.iterator();
        while (iterator.hasNext()) {
            Employee employee = iterator.next();
            if (employee.getId() == id) {
                iterator.remove();
                break;
            }
        }
    }
}

EmployeeService.java（Service）：

public interface EmployeeService {
    List<Employee> getAllEmployees();
    Employee getEmployeeById(int id);
    void addEmployee(Employee employee);
    void updateEmployee(Employee employee);
    void deleteEmployee(int id);
}

EmployeeServiceImpl.java（Service实现）：

public class EmployeeServiceImpl implements EmployeeService {
    private EmployeeDao employeeDao = new EmployeeDaoImpl();

    @Override
    public List<Employee> getAllEmployees() {
        return employeeDao.getAllEmployees();
    }

    @Override
    public Employee getEmployeeById(int id) {
        return employeeDao.getEmployeeById(id);
    }

    @Override
    public void addEmployee(Employee employee) {
        employeeDao.addEmployee(employee);
    }

    @Override
    public void updateEmployee(Employee employee) {
        employeeDao.updateEmployee(employee);
    }

    @Override
    public void deleteEmployee(int id) {
        employeeDao.deleteEmployee(id);
    }
}

EmployeeController.java（Controller）：

@RestController
@RequestMapping("/employee")
public class EmployeeController {
    private EmployeeService employeeService = new EmployeeServiceImpl();

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

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

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

    @PutMapping("/")
    public void updateEmployee(@RequestBody Employee employee) {
        employeeService.updateEmployee(employee);
    }

    @DeleteMapping("/{id}")
    public void deleteEmployee(@PathVariable int id) {
        employeeService.deleteEmployee(id);
    }
}

以上就是一个基本的Java代码示例，用于设计员工信息页面的Controller、Service、DAO和Bean。当然，这只是一个简单的示例，实际应用中还需要考虑更多的因素，如数据校验、异常处理等。