工作记录------lombok中@Data包含哪些功能？

待我称王封你为后i 2024-03-27 16:51 0阅读 0赞

## 工作记录------lombok中@Data包含哪些功能？ ##

在实体类中加上@Data后，实体类有哪些增强？

@Data
    public class BaseProcedure {
        
        @TableId(value = "id", type = IdType.ASSIGN_UUID)
        private String id;
    
        private String procedureCode;

写上@Data后，点击maven----clean—complie（编译）后，  
查看target，能够看到编译后的实体类对象。  
![在这里插入图片描述][c7afc9053fd94c8aaffacf00cf5e688a.png]  
具体代码如下所示：

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by FernFlower decompiler)
    //
    
    package com.example.demo.pojo;
    
    import com.baomidou.mybatisplus.annotation.IdType;
    import com.baomidou.mybatisplus.annotation.TableId;
    import java.util.Date;
    import org.springframework.format.annotation.DateTimeFormat;
    
    public class BaseProcedure {
        
        @TableId(
            value = "id",
            type = IdType.ASSIGN_UUID
        )
        private String id;
        private String procedureCode;
        private String procedureName;
        private Integer active;
        private String createBy;
        @DateTimeFormat(
            pattern = "yy-MM-dd HH:mm:ss"
        )
        private Date createTime;
        private String updateBy;
        @DateTimeFormat(
            pattern = "yy-MM-dd HH:mm:ss"
        )
        private Date updateTime;
    
        public BaseProcedure() {
        
        }
    
        public String getId() {
        
            return this.id;
        }
    
        public String getProcedureCode() {
        
            return this.procedureCode;
        }
    
        public String getProcedureName() {
        
            return this.procedureName;
        }
    
        public Integer getActive() {
        
            return this.active;
        }
    
        public String getCreateBy() {
        
            return this.createBy;
        }
    
        public Date getCreateTime() {
        
            return this.createTime;
        }
    
        public String getUpdateBy() {
        
            return this.updateBy;
        }
    
        public Date getUpdateTime() {
        
            return this.updateTime;
        }
    
        public BaseProcedure setId(final String id) {
        
            this.id = id;
            return this;
        }
    
        public BaseProcedure setProcedureCode(final String procedureCode) {
        
            this.procedureCode = procedureCode;
            return this;
        }
    
        public BaseProcedure setProcedureName(final String procedureName) {
        
            this.procedureName = procedureName;
            return this;
        }
    
        public BaseProcedure setActive(final Integer active) {
        
            this.active = active;
            return this;
        }
    
        public BaseProcedure setCreateBy(final String createBy) {
        
            this.createBy = createBy;
            return this;
        }
    
        public BaseProcedure setCreateTime(final Date createTime) {
        
            this.createTime = createTime;
            return this;
        }
    
        public BaseProcedure setUpdateBy(final String updateBy) {
        
            this.updateBy = updateBy;
            return this;
        }
    
        public BaseProcedure setUpdateTime(final Date updateTime) {
        
            this.updateTime = updateTime;
            return this;
        }
    
        public boolean equals(final Object o) {
        
            if (o == this) {
        
                return true;
            } else if (!(o instanceof BaseProcedure)) {
        
                return false;
            } else {
        
                BaseProcedure other = (BaseProcedure)o;
                if (!other.canEqual(this)) {
        
                    return false;
                } else {
        
                    label107: {
        
                        Object this$active = this.getActive();
                        Object other$active = other.getActive();
                        if (this$active == null) {
        
                            if (other$active == null) {
        
                                break label107;
                            }
                        } else if (this$active.equals(other$active)) {
        
                            break label107;
                        }
    
                        return false;
                    }
    
                    Object this$id = this.getId();
                    Object other$id = other.getId();
                    if (this$id == null) {
        
                        if (other$id != null) {
        
                            return false;
                        }
                    } else if (!this$id.equals(other$id)) {
        
                        return false;
                    }
    
                    Object this$procedureCode = this.getProcedureCode();
                    Object other$procedureCode = other.getProcedureCode();
                    if (this$procedureCode == null) {
        
                        if (other$procedureCode != null) {
        
                            return false;
                        }
                    } else if (!this$procedureCode.equals(other$procedureCode)) {
        
                        return false;
                    }
    
                    label86: {
        
                        Object this$procedureName = this.getProcedureName();
                        Object other$procedureName = other.getProcedureName();
                        if (this$procedureName == null) {
        
                            if (other$procedureName == null) {
        
                                break label86;
                            }
                        } else if (this$procedureName.equals(other$procedureName)) {
        
                            break label86;
                        }
    
                        return false;
                    }
    
                    label79: {
        
                        Object this$createBy = this.getCreateBy();
                        Object other$createBy = other.getCreateBy();
                        if (this$createBy == null) {
        
                            if (other$createBy == null) {
        
                                break label79;
                            }
                        } else if (this$createBy.equals(other$createBy)) {
        
                            break label79;
                        }
    
                        return false;
                    }
    
                    label72: {
        
                        Object this$createTime = this.getCreateTime();
                        Object other$createTime = other.getCreateTime();
                        if (this$createTime == null) {
        
                            if (other$createTime == null) {
        
                                break label72;
                            }
                        } else if (this$createTime.equals(other$createTime)) {
        
                            break label72;
                        }
    
                        return false;
                    }
    
                    Object this$updateBy = this.getUpdateBy();
                    Object other$updateBy = other.getUpdateBy();
                    if (this$updateBy == null) {
        
                        if (other$updateBy != null) {
        
                            return false;
                        }
                    } else if (!this$updateBy.equals(other$updateBy)) {
        
                        return false;
                    }
    
                    Object this$updateTime = this.getUpdateTime();
                    Object other$updateTime = other.getUpdateTime();
                    if (this$updateTime == null) {
        
                        if (other$updateTime != null) {
        
                            return false;
                        }
                    } else if (!this$updateTime.equals(other$updateTime)) {
        
                        return false;
                    }
    
                    return true;
                }
            }
        }
    
        protected boolean canEqual(final Object other) {
        
            return other instanceof BaseProcedure;
        }
    
        public int hashCode() {
        
            int PRIME = true;
            int result = 1;
            Object $active = this.getActive();
            result = result * 59 + ($active == null ? 43 : $active.hashCode());
            Object $id = this.getId();
            result = result * 59 + ($id == null ? 43 : $id.hashCode());
            Object $procedureCode = this.getProcedureCode();
            result = result * 59 + ($procedureCode == null ? 43 : $procedureCode.hashCode());
            Object $procedureName = this.getProcedureName();
            result = result * 59 + ($procedureName == null ? 43 : $procedureName.hashCode());
            Object $createBy = this.getCreateBy();
            result = result * 59 + ($createBy == null ? 43 : $createBy.hashCode());
            Object $createTime = this.getCreateTime();
            result = result * 59 + ($createTime == null ? 43 : $createTime.hashCode());
            Object $updateBy = this.getUpdateBy();
            result = result * 59 + ($updateBy == null ? 43 : $updateBy.hashCode());
            Object $updateTime = this.getUpdateTime();
            result = result * 59 + ($updateTime == null ? 43 : $updateTime.hashCode());
            return result;
        }
    
        public String toString() {
        
            return "BaseProcedure(id=" + this.getId() + ", procedureCode=" + this.getProcedureCode() + ", procedureName=" + this.getProcedureName() + ", active=" + this.getActive() + ", createBy=" + this.getCreateBy() + ", createTime=" + this.getCreateTime() + ", updateBy=" + this.getUpdateBy() + ", updateTime=" + this.getUpdateTime() + ")";
        }
    }

根据编译后的文件，可以看到包括了：  
无参构造器、  
get方法、  
set方法、  
hashCode方法、  
equals方法、  
toString方法。

### 结论：@Data注解相当于 ###

@NoArgsConstructor  
@Getter  
@Setter  
@EqualsAndHashCode  
@ToString  
这5个注解集合，可以看到如果需要使用到这个实体类的全参构造方法，需要再加上@AllArgsConstructor注解。  
如果没有特殊需求时，只写@Data注解即可。

[c7afc9053fd94c8aaffacf00cf5e688a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/1e5e71e238db4468a24eff881e3e1b16.png