java-如何在spring-boot数据其余部分的POST json中传递@EmbeddedId

我已经使用Spring Boot Data REST构建了一个REST API.我正在使用EmbeddedId,并且还实现了BackendIdConverter.

以下是我的嵌入式课程

@Embeddable
public class EmployeeIdentity implements Serializable {
    @NotNull
    @Size(max = 20)
    private String employeeId;

    @NotNull
    @Size(max = 20)
    private String companyId;

    public EmployeeIdentity() {}

    public EmployeeIdentity(String employeeId, String companyId) {
        this.employeeId = employeeId;
        this.companyId = companyId;
    }

    public String getEmployeeId() {
        return employeeId;
    }

    public void setEmployeeId(String employeeId) {
        this.employeeId = employeeId;
    }

    public String getCompanyId() {
        return companyId;
    }

    public void setCompanyId(String companyId) {
        this.companyId = companyId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        EmployeeIdentity that = (EmployeeIdentity) o;

        if (!employeeId.equals(that.employeeId)) return false;
        return companyId.equals(that.companyId);
    }

    @Override
    public int hashCode() {
        int result = employeeId.hashCode();
        result = 31 * result + companyId.hashCode();
        return result;
    }
}

这是我的员工模型

@Entity
@Table(name = "employees")
public class Employee {

    @EmbeddedId
    private EmployeeIdentity id;

    @NotNull
    @Size(max = 60)
    private String name;

    @NaturalId
    @NotNull
    @Email
    @Size(max = 60)
    private String email;

    @Size(max = 15)
    @Column(name = "phone_number", unique = true)
    private String phoneNumber;

    public Employee() {}

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

    public EmployeeIdentity getId() {
        return id;
    }

    public void setId(EmployeeIdentity id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }
}

并使用我的嵌入式ID而不是合格的类名正确生成资源链接

@Component
public class EmployeeIdentityIdConverter implements BackendIdConverter {

    @Override
    public Serializable fromRequestId(String id, Class<?> aClass) {
        String[] parts = id.split("_");
        return new EmployeeIdentity(parts[0], parts[1]);
    }

    @Override
    public String toRequestId(Serializable source, Class<?> aClass) {
        EmployeeIdentity id = (EmployeeIdentity) source;
        return String.format("%s_%s", id.getEmployeeId(), id.getCompanyId());
    }

    @Override
    public boolean supports(Class<?> type) {
        return Employee.class.equals(type);
    }
}

这是我的存储库代码

@RepositoryRestResource(collectionResourceRel = "employees", path = "employees")
public interface EmployeeRepository extends PagingAndSortingRepository<Employee, EmployeeIdentity> {
}

这对于GET请求很好用,但是我需要能够POST.我注意到的第一件事是,当我使用json执行POST时

{
  "id": {
       "employeeId": "E-267", 
       "companyId": "D-432"
  },
  "name": "Spider Man", 
  "email": "spman@somedomain.com", 
  "phoneNumber": "+91-476253455"
}

这行不通. EmployeeIdentityIdConverter#fromRequestId抛出空指针异常,因为字符串参数为空.因此,我添加了一个null检查,并在id为null时返回默认的EmployeeIdentity.如本答案所述https://stackoverflow.com/a/41061029/4801462

修改后的EmployeeIdentityIdConverter#fromRequestId

@Override
public Serializable fromRequestId(String id, Class<?> aClass) {
    if (id == null) {
        return new EmployeeIdentity();
    }
    String[] parts = id.split("_");
    return new EmployeeIdentity(parts[0], parts[1]);
}

但这提出了另一个问题.由于使用了默认构造函数,而employeeId和companyId为null,因此我的hashCode和equals实现现在通过null指针异常进行.

为了解决这个问题,我给了employeeId和companyId默认值

**修改后的Employee#Employee()构造函数*

public Employee() {
    this.employeeId = "";
    this.companyId = "";
}

注意

我什至不确定我在上面做什么.我只是想解决发生的小问题.

顺便说一句,如果您认为这不起作用,那么您是对的.虽然我没有收到错误并且请求成功,但是没有得到我期望的行为.使用空的employeeId和companyId创建了一个新条目.

如何使POST到REST API的模型使用@EmbeddedId和spring boot数据休息？

解决方法:

这是另一种解决方案. (虽然还不完美.)

公开您的Employee类的ID：

@Configuration
  protected class MyRepositoryRestConfigurer implements RepositoryRestConfigurer {

   @Override
   public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
     config.exposeIdsFor(ThemeMessage.class);
   }
}

将以下行添加到转换器中(在POST请求期间,id为null)：

@Override
public Serializable fromRequestId(String id, Class<?> aClass) {
    if(id==null) {
      return null;
    }
    String[] parts = id.split("_");
    return new EmployeeIdentity(parts[0], parts[1]);
}

以下POST请求将起作用：

{
  "id": {
       "employeeId": "E-267", 
       "companyId": "D-432"
  },
  "name": "Spider Man", 
  "email": "spman@somedomain.com", 
  "phoneNumber": "+91-476253455"
}

但是,id字段将在所有响应中公开.但这也许不是一个真正的问题,因为当您使用复合ID时,它通常意味着该ID不仅是抽象标识符,而且其各个部分都有有意义的内容,应该显示在实体主体中.

实际上,我也在考虑将这些行添加到我自己的代码中….：:)

标签：spring-boot,spring-data-rest,java
来源： https://codeday.me/bug/20191108/2006490.html