Intellij IDEA中lombok插件的使用

àì夳堔傛蜴生んèń 2022-01-27 15:13 421阅读 0赞

*  idea中开启对lombok插件的支持

下载lombok插件，在settings中  
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搜索lombok，然后再install，install好了之后再restart  
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*  lombok的使用

在pom.xml文件中添加lombok的依赖

<dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>

在实体类中常用注解的使用，只需要在实体类中添加下列响应注解，lombok插件就能自动生成相应的方法

> **@Setter**：注解在类上，该类所有的字段都生成set方法，注解在字段上，只为该字段生成set方法  
> **@Getter**：注解在类上，该类所有的字段都生成get方法，注解在字段上，只为该字段生成get方法  
> **@Data**：注解在类上；提供类所有属性的get和set方法，此外还提供了equals、canEqual、hashCode、toString方法  
> **@ToString**：注解在类上，生成toString方法  
> **@EqualAndHashCode**：注解在类上，生成equals、canEqual、hashCode方法  
> **@NoArgsConstructor**：注解在类上；生成一个无参的构造方法  
> **@AllArgsConstructor**：注解在类上；生成一个全参的构造方法

*  举例使用

在User实体类中添加@Data注解，相当于提供类所有属性的get和set方法，此外还提供了equals、canEqual、hashCode、toString方法

import lombok.*;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    
    @Entity
    @Data
    public class User { 
        @Id
        @GeneratedValue
        private Long id;
        private String name;
        private Integer age;
        private String sex;
        private String address;
    }

在编译后的class文件中

import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    
    @Entity
    public class User { 
        @Id
        @GeneratedValue
        private Long id;
        private String name;
        private Integer age;
        private String sex;
        private String address;
    
        public User() { }
        public Long getId() { return this.id;}
        public String getName() { return this.name;}
        public Integer getAge() { return this.age;}
        public String getSex() { return this.sex;}
        public String getAddress() { return this.address;}
        public void setId(final Long id) { this.id = id;}
        public void setName(final String name) { this.name = name;}
        public void setAge(final Integer age) { this.age = age;}
        public void setSex(final String sex) { this.sex = sex;}
        public void setAddress(final String address) { this.address = address;}
        public boolean equals(final Object o) { 
            if (o == this) { 
                return true;
            } else if (!(o instanceof User)) { 
                return false;
            } else { 
                User other = (User)o;
                if (!other.canEqual(this)) { 
                    return false;
                } else { 
                    label71: { 
                        Object this$id = this.getId();
                        Object other$id = other.getId();
                        if (this$id == null) { 
                            if (other$id == null) { 
                                break label71;
                            }
                        } else if (this$id.equals(other$id)) { 
                            break label71;
                        }
                        return false;
                    }
                    Object this$name = this.getName();
                    Object other$name = other.getName();
                    if (this$name == null) { 
                        if (other$name != null) { 
                            return false;
                        }
                    } else if (!this$name.equals(other$name)) { 
                        return false;
                    }
                    label57: { 
                        Object this$age = this.getAge();
                        Object other$age = other.getAge();
                        if (this$age == null) { 
                            if (other$age == null) { 
                                break label57;
                            }
                        } else if (this$age.equals(other$age)) { 
                            break label57;
                        }
                        return false;
                    }
                    Object this$sex = this.getSex();
                    Object other$sex = other.getSex();
                    if (this$sex == null) { 
                        if (other$sex != null) { 
                            return false;
                        }
                    } else if (!this$sex.equals(other$sex)) { 
                        return false;
                    }
    
                    Object this$address = this.getAddress();
                    Object other$address = other.getAddress();
                    if (this$address == null) { 
                        if (other$address == null) { 
                            return true;
                        }
                    } else if (this$address.equals(other$address)) { 
                        return true;
                    }
    
                    return false;
                }
            }
        }
        protected boolean canEqual(final Object other) { 
            return other instanceof User;
        }
        public int hashCode() { 
            int PRIME = true;
            int result = 1;
            Object $id = this.getId();
            int result = result * 59 + ($id == null ? 43 : $id.hashCode());
            Object $name = this.getName();
            result = result * 59 + ($name == null ? 43 : $name.hashCode());
            Object $age = this.getAge();
            result = result * 59 + ($age == null ? 43 : $age.hashCode());
            Object $sex = this.getSex();
            result = result * 59 + ($sex == null ? 43 : $sex.hashCode());
            Object $address = this.getAddress();
            result = result * 59 + ($address == null ? 43 : $address.hashCode());
            return result;
        }
        public String toString() { 
            return "User(id=" + this.getId() + ", name=" + this.getName() + ", age=" + this.getAge() + ", sex=" + this.getSex() + ", address=" + this.getAddress() + ")";
        }
    }

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