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Lombok plug-in
2022-07-07 05:35:00 【PIKapikaaaa】
Lombok plug-in unit
lombok Plug in introduction
lombok Is a plug-in , The purpose is to use annotations to give fields in your class , Automatically add attribute constructors ,ToString Method ,Equals Methods, etc. .
The more convenient point is , When you change fields ,lombok Changes will occur immediately to maintain consistency with your code .
frequently-used lombok Note introduction
@Getter : Can automatically generate parameters getter Method .
@Setter : Can automatically generate parameters setter Method
@ToString : call toString() Method , You can output the values of all attributes in the entity class
@RequiredArgsConstructor: Will generate a containing constant , And the logo NotNull How to construct the variables of . The generated constructor is private private. This one is seldom used .
@EqualsAndHashCode
1. It will generate equals and hashCode Method
2. Non static attributes are used by default
3. Can pass exclude Parameters exclude attributes that do not need to be generated
@EqualsAndHashCode(exclude = {“ Fields in the table 1”, “ Fields in the table 2”})
4. Can pass of Parameter to specify the attribute to be generated
@EqualsAndHashCode(of = {“ Fields in the table 1”, “ Fields in the table 2”})
5. By default, it does not call the methods of the parent class , Only use the attributes defined by this class to operate , have access to callSuper=true To solve , Will be in @Data I'll explain it in .
@Data: This annotation is actually a combination of the above five annotations —@Getter、@Setter、@RequiredArgsConstructor、@ToString、@EqualsAndHashCode
@NoArgsConstructor: Generate a parameterless construction method .
@AllArgsConstructor: Generate a constructor that contains all variables .
@Value: This annotation should be consistent with Spring Of @Value Annotation distinction ,Spring Is to read the content from the configuration file , This annotation is that all fields in the class are declared as private final type , Only generates Getter Method , Will not generate Setter Method , Rarely used .
@Cleanup: It is mainly used to turn off the use of resources .
idea install lombok plug-in unit
First we need to install IntelliJ IDEA Medium lombok plug-in unit .
open IntelliJ IDEA Then click... In the menu bar File–>Settings, Or use shortcut keys Ctrl+Alt+S Go to the settings page
Restart after installation idea—【 I am idea Version is 2021】
lombok Use of plug-ins
@Data
@AllArgsConstructor
@NoArgsConstructor
// Used to represent the mapping relationship between entity classes and database tables , When the entity class name is different from the name of the table, you must add @TableName
@TableName("user")
public class User {
// Indicates that the database self increment strategy is used
@TableId(type = IdType.AUTO)
private Long id;
// When the attribute name in the entity class is inconsistent with the field name in the database , have access to annotation :@TableField To represent the mapping relationship
@TableField("name")
private String username;
private Integer age;
private String email;
// @TableField(exist = false) Express There is no such field in the database table , Mapping transformation sql Statement will not spell this field
@TableField(exist = false)
private Date birthday;
public User(String name, Integer age, String email) {
this.username = name;
this.age = age;
this.email = email;
}
}
me = name;
this.age = age;
this.email = email;
}
}
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