英文:

Instead of id name needs to be display spring boot

问题 {#heading}

我有一个Spring Boot应用程序，用于保存和检索任务。在检索时，我想显示学生姓名而不是学生ID。
我已经附上了我的当前代码。这是Postman中响应的格式。

{
    "taskid": 4,
    "taskname": "taskkk",
    "description": "ssstaskkk",
    "complete": true,
    "studentId": 1
}

TaskController

@GetMapping(path="/getAllTasks")
public List<TaskDTO> getAllTasks()
{
    List<TaskDTO> allTasks = taskService.getAllTasks();
    System.out.println(allTasks.size());
    System.out.println(allTasks);
    return allTasks;
}

TaskService

List<TaskDTO> getAllTasks();

TaskServiceIMPL

@Override
public List<TaskDTO> getAllTasks() {
List&lt;Task&gt; getTasks = taskRepo.findAll();
System.out.println(getTasks);
List&lt;TaskDTO&gt; taskDTOList = new ArrayList&lt;&gt;();
for(Task t:getTasks)
{
TaskDTO taskDTO = new TaskDTO(
t.getTaskid(),
t.getTaskname(),
t.getDescription(),
t.getComplete(),
t.getStudent().getStudentid()
);
taskDTOList.add(taskDTO);
}
return taskDTOList;

}

Task

public class Task {
@Id
@Column(name = "task_id", length = 50)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long taskid;
@Column(name = "task_name")
private String taskname;
@Column(name = "description")
private String description;
@Column(name = "complete")
private Boolean complete;
@OneToOne
@JoinColumn(name = "student_id")
private Student student;

}

TaskRepo

public interface TaskRepo extends JpaRepository<Task,Long >
{
}

Student Entity

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="student_id", length = 50)
private Long  studentid;
@Column(name="student_name", length = 50)
private String studentname;
@Column(name="address", length = 70)
private String address;
@Column(name="mobile", length = 12)
private int mobile;
@Column(name="activestate", columnDefinition = "TINYINT default 1")
private boolean activestate;

Student DTO

public class StudentDTO {
    private Long studentid;
    private String studentname;
    private String address;
    private int mobile;
    private boolean activestate;
}

英文:

I have a Spring Boot application which saves and retrieves tasks. During the retrieval, I want to display student name instead of student id.
I have attached my current code below. This is what the response in Postman looks like this format.

  {
        "taskid": 4,
        "taskname": "taskkk",
        "description": "ssstaskkk",
        "complete": true,
        "studentId": 1
    }

TaskController

@GetMapping(path="/getAllTasks")
    public List<TaskDTO> getAllTasks()
    {
        List<TaskDTO> allTasks = taskService.getAllTasks();
        System.out.println(allTasks.size());
        System.out.println(allTasks);
        return allTasks;
    }

TaskService

  List<TaskDTO> getAllTasks();

TaskServiceIMPL

@Override
public List<TaskDTO> getAllTasks() {
List<Task> getTasks = taskRepo.findAll();
System.out.println(getTasks);
List<TaskDTO> taskDTOList = new ArrayList<>();
for(Task t:getTasks)
{
TaskDTO taskDTO = new TaskDTO(
t.getTaskid(),
t.getTaskname(),
t.getDescription(),
t.getComplete(),
t.getStudent().getStudentid()
);
taskDTOList.add(taskDTO);
}
return taskDTOList;

}

Task

public class Task {
@Id
@Column(name = "task_id", length = 50)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long taskid;
@Column(name = "task_name")
private String taskname;
@Column(name = "description")
private String description;
@Column(name = "complete")
private Boolean complete;
@OneToOne
@JoinColumn(name = "student_id")
private Student student;

}

TaskRepo

public interface TaskRepo extends JpaRepository<Task,Long >
{
`}
`

Student Entity

@Id
@GeneratedValue(strategy =GenerationType.IDENTITY)
@Column(name="student_id", length = 50)
private Long  studentid;
@Column(name="student_name", length = 50)
private String studentname;
@Column(name="address", length = 70)
private String address;
@Column(name="mobile", length = 12)
private int mobile;
@Column(name="activestate", columnDefinition = "TINYINT default 1") private boolean activestate;

Student DTO

public class StudentDTO {
    private Long studentid;
    private String studentname;
    private String address;
    private int mobile;
    private boolean activestate;
}

答案1 {#1}

得分: 1

从您的TaskController中，您返回了一个TaskDTO对象的列表。
为了显示学生的名称，您需要在您的TaskDTO类内部添加一个StudentDTO类。您的TaskDTO类应该像下面这样：

修改后的TaskDTO：

public class TaskDTO {
    private Long taskid;
    private String taskname;
    private String description;
    private Boolean complete;
    private StudentDTO student; // 在这里使用StudentDTO，同时添加构造函数、getter和setter方法。
}

现在，您需要更新您的TaskServiceIMPL以创建带有StudentDTO的TaskDTO对象。

修改后的TaskServiceIMPL：

@Override
public List<TaskDTO> getAllTasks() {
    List<Task> getTasks = taskRepo.findAll();
List&lt;TaskDTO&gt; taskDTOList = new ArrayList&lt;&gt;();
for (Task t : getTasks) {
Student student = t.getStudent(); // 获取关联的学生
StudentDTO studentDTO = new StudentDTO(
student.getStudentid(),
student.getStudentname(),
student.getAddress(),
student.getMobile(),
student.isActivestate()
);
TaskDTO taskDTO = new TaskDTO(
    t.getTaskid(),
    t.getTaskname(),
    t.getDescription(),
    t.getComplete(),
    studentDTO // 在这里设置StudentDTO对象
);

taskDTOList.add(taskDTO);

}
return taskDTOList;

}

现在，您的TaskController应该返回修改后的TaskDTO。 英文:

From you TaskController, you are returning a list of TaskDTO objects.
In order to display student names, you need to add StudentDTO class inside your TaskDTO class. Your TaskDTO class should be like below:

Modified TaskDTO:

public class TaskDTO {
    private Long taskid;
    private String taskname;
    private String description;
    private Boolean complete;
    private StudentDTO student; // Use StudentDTO here along 
                                  with it's constructor,getters,setters.
}

Now, you need to update your TaskServiceIMPL to create TaskDTO objects with StudentDTO.

Modified TaskServiceIMPL:

@Override
public List<TaskDTO> getAllTasks() {
    List<Task> getTasks = taskRepo.findAll();
List<TaskDTO> taskDTOList = new ArrayList<>();
for(Task t : getTasks) {
Student student = t.getStudent(); // Get the associated student
StudentDTO studentDTO = new StudentDTO(
student.getStudentid(),
student.getStudentname(),
student.getAddress(),
student.getMobile(),
student.isActivestate()
);
TaskDTO taskDTO = new TaskDTO(
    t.getTaskid(),
    t.getTaskname(),
    t.getDescription(),
    t.getComplete(),
    studentDTO // Set the StudentDTO object here
);

taskDTOList.add(taskDTO);

}
return taskDTOList;

}

Now, your TaskController should return the modified TaskDTO