Spring Boot 依赖之 lombok的@Data注解

1、代码编译之后，字节码文件decompile反编译之后的内容。其实这也就是不加注解需要手动写的，很多setter getter太多太繁琐。

package com.javastudy.maven.pojo;public class User {private Integer id;private String username;private String password;private String email;public void setId(Integer id) {this.id = id;}public void setUsername(String username) {this.username = username;}public void setPassword(String password) {this.password = password;}public void setEmail(String email) {this.email = email;}public boolean equals(Object o) {if (o == this)return true; if (!(o instanceof User))return false; User other = (User)o;if (!other.canEqual(this))return false; Object this$id = getId(), other$id = other.getId();if ((this$id == null) ? (other$id != null) : !this$id.equals(other$id))return false; Object this$username = getUsername(), other$username = other.getUsername();if ((this$username == null) ? (other$username != null) : !this$username.equals(other$username))return false; Object this$password = getPassword(), other$password = other.getPassword();if ((this$password == null) ? (other$password != null) : !this$password.equals(other$password))return false; Object this$email = getEmail(), other$email = other.getEmail();return !((this$email == null) ? (other$email != null) : !this$email.equals(other$email));}protected boolean canEqual(Object other) {return other instanceof User;}public int hashCode() {int PRIME = 59;result = 1;Object $id = getId();result = result * 59 + (($id == null) ? 43 : $id.hashCode());Object $username = getUsername();result = result * 59 + (($username == null) ? 43 : $username.hashCode());Object $password = getPassword();result = result * 59 + (($password == null) ? 43 : $password.hashCode());Object $email = getEmail();return result * 59 + (($email == null) ? 43 : $email.hashCode());}public String toString() {return "User(id=" + getId() + ", username=" + getUsername() + ", password=" + getPassword() + ", email=" + getEmail() + ")";}public User(Integer id, String username, String password, String email) {this.id = id;this.username = username;this.password = password;this.email = email;}public User() {}public Integer getId() {return this.id;}public String getUsername() {return this.username;}public String getPassword() {return this.password;}public String getEmail() {return this.email;}
}

java源文件，使用@Data注解之后的代码：

package com.javastudy.maven.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;/*** @author zhizhou   2024/6/27 17:37*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {private Integer id;private String username;private String password;private String email; 
}

引入lombok
要使用 @Data 注解要先引入lombok，lombok 是什么，它是一个工具类库，可以用简单的注解形式来简化代码，提高开发效率。

<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.4</version><scope>provided</scope>
</dependency>

在编译器中添加插件
这里以IDEA为例，在setting的plugin里搜索 lombok plugin，安装插件，安装完之后就可以在IDEA的Structure结构中看到@Data注解的效果。

安装完之后就可以在IDEA的Structure结构中看到@Data注解的效果。

源码地址：学习可供参考 码云