Hibernate 双向关联转换 JSON 防止死循环

Hibernate 中经常存在双向关联的情况，此处将数据转换为 JSON 格式则可能导致死循环

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获取数据时只需要单向关联

1. 这种情况下父类需要子类数据，而子类不需要父类数据

@Entity@Table(name = "ht_feedback_template")public class FeedbackTemplate extends BaseModel {
         @OneToMany(mappedBy = "feedbackTemplate", cascade = {CascadeType.ALL}, fetch = FetchType.LAZY)    @OrderBy("indexNo asc")    private Set
     
       questions;    public Set
      
        getQuestions() {        return questions;    }    public void setQuestions(Set
       
         questions) {        this.questions = questions;    }}
       
      
     

1. 在子类中对父类的引用字段加上 @JsonIgnore 即可

@Entity@Table(name = "ht_feedback_question")public class FeedbackQuestion extends BaseModel {
         @ManyToOne    @JsonIgnore    private FeedbackTemplate feedbackTemplate;    public FeedbackTemplate getFeedbackTemplate() {        return feedbackTemplate;    }    public void setFeedbackTemplate(FeedbackTemplate feedbackTemplate) {        this.feedbackTemplate = feedbackTemplate;    }}

获取数据时确实需要双向关联

1. 在父类对子类的引用字段加上 @JsonManagedReference

@Entity@Table(name = "ht_feedback_template")public class FeedbackTemplate extends BaseModel {
         @OneToMany(mappedBy = "feedbackTemplate", cascade = {CascadeType.ALL}, fetch = FetchType.LAZY)    @OrderBy("indexNo asc")  @JsonManagedReference    private Set
     
       questions;    public Set
      
        getQuestions() {        return questions;    }    public void setQuestions(Set
       
         questions) {        this.questions = questions;    }}
       
      
     

1. 在子类中对父类的引用字段加上 @JsonBackReference 即可

@Entity@Table(name = "ht_feedback_question")public class FeedbackQuestion extends BaseModel {
         @ManyToOne  @JsonBackReference    private FeedbackTemplate feedbackTemplate;    public FeedbackTemplate getFeedbackTemplate() {        return feedbackTemplate;    }    public void setFeedbackTemplate(FeedbackTemplate feedbackTemplate) {        this.feedbackTemplate = feedbackTemplate;    }}