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问题描述

我尝试使用spring boot和spring data jpa创建一对多的双向映射,请查看以下实体

i am try to create a one to many bidirectional mapping using spring boot and spring data jpa please look the below entity

@Entity
public class Employer
{
private Long id;
private String employerName;
private List<Employee> employees;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId()
{
    return id;
}
public void setId(Long id)
{
    this.id = id;
}
public String getEmployerName()
{
    return employerName;
}
public void setEmployerName(String employerName)
{
    this.employerName = employerName;
}

@OneToMany(cascade=CascadeType.ALL, mappedBy="employer")
public List<Employee> getEmployees()
{
    return employees;
}
public void setEmployees(List<Employee> employees)
{
    this.employees = employees;
}
}
@Entity
public class Employee
{
private Long id;
private String employeeName;
private Employer employer;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getId()
{
    return id;
}
public void setId(Long id)
{
    this.id = id;
}
public String getEmployeeName()
{
    return employeeName;
}
public void setEmployeeName(String employeeName)
{
    this.employeeName = employeeName;
}
@ManyToOne(cascade=CascadeType.ALL, fetch = FetchType.LAZY)
public Employer getEmployer()
{
    return employer;
}
public void setEmployer(Employer employer)
{
    this.employer = employer;
}
}
public interface EmployerServices extends JpaRepository<Employer, Long> {
}
public interface EmployeeServices extends JpaRepository<Employee, Long> {
}
 @RestController
 public class Controller {
 @Autowired EmployeeServices employeeServices;
 @Autowired EmployerServices employerServices;
 @GetMapping("/getempr")
 public Object getempr(){
    return employerServices.findOne(1L);
 }
}

现在问题开始开始,请看我的输出

now the problem begin start see my out put

它看起来像是内斗循环,我的服务器抛出错误getOutputStream()已为此响应调用.

its look like a infighting loop and my server throwing error getOutputStream() has already been called for this response.

 I used @JsonBackReference & @JsonManagedReference

注释,但问题在于它的作用就像一对多

annotation but the problem is its working like one to many

 {
   "id":1,
   "employerName":"employer",
   "employees":[
     {"id":1,"employeeName":"emp1"},
     {"id":2,"employeeName":"emp2"}
   ]
}

如果我想引起所有人之间的关注,就像所有有雇主的雇员一样.输出是

if I am trying to get in the concern of many to one like all employee with employer. the output is

 [
  {
   "id":1,
   "employeeName":"emp1"
  },
  {
    "id":2,
    "employeeName":"emp2"}
 ]

它没有向我显示雇主详细信息.

its not showing me the employer details.

请向我建议我在做什么错.预先感谢!

please suggets me guys what i am doing wrong. thanks in advance!!

推荐答案

使用JSON是双向映射的问题.使用以下属性.

with the JSON its a problem with bi-directional mapping. Use the below properties.

@JsonIgnoreProperties("employer")
@JsonIgnoreProperties("employees")

请始终保持获取类型.

希望这会起作用.

这篇关于如何修复弹簧靴一对多双向无限循环?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

06-04 07:53
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