1、业务描述 1）一个任务包括多项内容 2）不同的内容可分配给不同的员工完成，添加任务项时可选择分配给哪个员工 3）所有员工完成任务后，任务状态自动变更为已完成 4）任务发布后不允许修改，已完成的任务不允许任何操作 2、开发要求 1）建立数据库表结构，并添加数据 2）根据业务描述设计需要的请求接口，实现增删改查操作，编写必要的校验和异常处 理，编写必要的注释 3）如果不确定或找不到相应的方法可以用注释写出思路 4）不需要创建前端页面，用APIPost或PostMan调试，实现前后端分离 3、数据库字段： 任务表：Task taskId 标识列 taskName 任务名称 status 状态：未发布、进行中、已完成 createTime 创建时间 publishTime 发布时间 finishTime 完成时间 任务详情:TaskDetail taskDetailId 标识列 taskId 外键 taskConent 任务详情 employeeId 任务分配的员工ID finishStatus 任务内容完成状态：未完成、已 完成； finishTime 完成时间 员工表：Employee employeeId 标识列 employeeName 员工姓名 4、用springboot实现java代码

好的，以下是基于Spring Boot框架的Java代码示例，实现了任务管理系统的增删改查操作：

Task实体类：

@Entity
@Table(name = "task")
public class Task {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long taskId;

    private String taskName;

    private String status;

    private Date createTime;

    private Date publishTime;

    private Date finishTime;

    // getter and setter methods
}

TaskDetail实体类：

@Entity
@Table(name = "task_detail")
public class TaskDetail {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long taskDetailId;

    @ManyToOne
    @JoinColumn(name = "task_id")
    private Task task;

    private String taskContent;

    @ManyToOne
    @JoinColumn(name = "employee_id")
    private Employee employee;

    private String finishStatus;

    private Date finishTime;

    // getter and setter methods
}

Employee实体类：

@Entity
@Table(name = "employee")
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long employeeId;

    private String employeeName;

    // getter and setter methods
}

TaskDAO接口：

public interface TaskDAO extends JpaRepository<Task, Long> {
    List<Task> findByStatus(String status);
}

TaskDetailDAO接口：

public interface TaskDetailDAO extends JpaRepository<TaskDetail, Long> {
    List<TaskDetail> findByEmployee(Employee employee);

    List<TaskDetail> findByTask(Task task);
}

EmployeeDAO接口：

public interface EmployeeDAO extends JpaRepository<Employee, Long> {
    Employee findByEmployeeName(String employeeName);
}

TaskService实现类：

@Service
public class TaskServiceImpl implements TaskService {
    @Autowired
    private TaskDAO taskDAO;

    @Autowired
    private TaskDetailDAO taskDetailDAO;

    @Autowired
    private EmployeeDAO employeeDAO;

    @Override
    public Task saveTask(Task task) {
        return taskDAO.save(task);
    }

    @Override
    public TaskDetail saveTaskDetail(TaskDetail taskDetail) {
        return taskDetailDAO.save(taskDetail);
    }

    @Override
    public void deleteTask(Task task) {
        taskDAO.delete(task);
    }

    @Override
    public List<Task> getTasksByStatus(String status) {
        return taskDAO.findByStatus(status);
    }

    @Override
    public List<TaskDetail> getTaskDetailsByEmployee(Employee employee) {
        return taskDetailDAO.findByEmployee(employee);
    }

    @Override
    public List<TaskDetail> getTaskDetailsByTask(Task task) {
        return taskDetailDAO.findByTask(task);
    }

    @Override
    public Employee getEmployeeByName(String employeeName) {
        return employeeDAO.findByEmployeeName(employeeName);
    }
}

TaskController类：

@RestController
@RequestMapping("/api/tasks")
public class TaskController {
    @Autowired
    private TaskService taskService;

    @PostMapping("")
    public Task createTask(@RequestBody Task task) {
        task.setStatus("未发布");
        task.setCreateTime(new Date());
        return taskService.saveTask(task);
    }

    @PostMapping("/{taskId}/details")
    public TaskDetail createTaskDetail(@PathVariable Long taskId, @RequestBody TaskDetail taskDetail) {
        Task task = taskService.getTaskById(taskId);
        taskDetail.setTask(task);
        taskDetail.setFinishStatus("未完成");
        return taskService.saveTaskDetail(taskDetail);
    }

    @GetMapping("")
    public List<Task> getTasks() {
        return taskService.getTasksByStatus("已完成");
    }

    @GetMapping("/{taskId}/details")
    public List<TaskDetail> getTaskDetails(@PathVariable Long taskId) {
        Task task = taskService.getTaskById(taskId);
        return taskService.getTaskDetailsByTask(task);
    }

    @PutMapping("/{taskId}/publish")
    public Task publishTask(@PathVariable Long taskId) {
        Task task = taskService.getTaskById(taskId);
        task.setStatus("进行中");
        task.setPublishTime(new Date());
        return taskService.saveTask(task);
    }

    @PutMapping("/{taskId}/finish")
    public Task finishTask(@PathVariable Long taskId) {
        Task task = taskService.getTaskById(taskId);
        task.setStatus("已完成");
        task.setFinishTime(new Date());
        return taskService.saveTask(task);
    }
}

TaskDetailController类：

@RestController
@RequestMapping("/api/task_details")
public class TaskDetailController {
    @Autowired
    private TaskService taskService;

    @GetMapping("/employees/{employeeName}")
    public List<TaskDetail> getTaskDetailsByEmployee(@PathVariable String employeeName) {
        Employee employee = taskService.getEmployeeByName(employeeName);
        return taskService.getTaskDetailsByEmployee(employee);
    }
}

EmployeeController类：

@RestController
@RequestMapping("/api/employees")
public class EmployeeController {
    @Autowired
    private TaskService taskService;

    @PostMapping("")
    public Employee createEmployee(@RequestBody Employee employee) {
        return taskService.saveEmployee(employee);
    }

    @GetMapping("/{employeeName}")
    public Employee getEmployeeByName(@PathVariable String employeeName) {
        return taskService.getEmployeeByName(employeeName);
    }
}

以上是一个简单的任务管理系统的Java代码示例，实现了增删改查等基本操作，可以通过PostMan等工具进行测试。需要注意的是，这只是一个示例代码，实际项目开发中还需要根据具体业务需求进行调整和优化。