第七篇:SpringBoot 2.x集成Lombok-白红宇

之前写了一大堆代码，手都写软了，突然发现我们之前写的代码是这样的

package com.priv.gabriel.entity;/** * Created with Intellij IDEA. * * @Author: Gabriel * @Date: 2018-10-14 * @Description: */public class User {    private long id;    private String username;    private String nickname;    private int age;    public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getNickname() {        return nickname;    }    public void setNickname(String nickname) {        this.nickname = nickname;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "User{" +                "id=" + id +                ", username='" + username + '\'' +                ", nickname='" + nickname + '\'' +                ", age=" + age +                '}';    }}

这样的

package com.priv.gabriel.demoformybatis.entity;/** * Created with Intellij IDEA. * * @Author: Gabriel * @Date: 2018-10-14 * @Description: */public class User {    private long id;    private String username;    private String passwd;    public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPasswd() {        return passwd;    }    public void setPasswd(String passwd) {        this.passwd = passwd;    }}

和这样的

package com.priv.gabriel.entity;import javax.persistence.*;/** * Created with Intellij IDEA. * * @Author: Gabriel * @Date: 2018-10-08 * @Desciption: */@Entity@Table(name = "users")public class User {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    private long id;    @Column(nullable = false)    private String username;    @Column(nullable = false)    private String passwd;    public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPasswd() {        return passwd;    }    public void setPasswd(String passwd) {        this.passwd = passwd;    }}

看出问题了吗，三十行的代码，二十行都在get/set还有几行的toString，好好的一个实体类，除了属性基本就没什么可看的了，虽然都是靠快捷键生成的，但是有没有什么办法可以让我们少在get/set方法上浪费时间呢？

接下来介绍一下本次的主角Lombok，一个让你可以早点回家陪老婆孩子的神器

先说一下如何使用

pom.xml


             
                  
       
        org.springframework.boot
                   
       
        spring-boot-starter
               
              
                  
       
        org.projectlombok
                   
       
        lombok
                   
       
        true
               
              
                  
       
        org.springframework.boot
                   
       
        spring-boot-starter-test
                   
       
        test

如果只是引用了的话还不行,需要在Plugins里下载一个关于Lombok的插件

然后来看看使用过后的实体类

package com.priv.gabriel.entity;import lombok.*;/** * Created with Intellij IDEA. * * @Author: Gabriel * @Date: 2018-10-14 * @Description: */@Getter@Setter@ToString@EqualsAndHashCodepublic class User {    private int id;    private String username;    private int age;}

甚至是这样的

package com.priv.gabriel.entity;import lombok.*;/** * Created with Intellij IDEA. * * @Author: Gabriel * @Date: 2018-10-14 * @Description: */@Datapublic class User {    private int id;    private String username;    private int age;}

怎么样，感觉到工具类的方便之处了吗，然后简单的介绍一下这里一些注解的含义

@Setter 为该类的属性提供set方法

@Getter 为该类的属性提供get方法

@ToString 提供toString方法

@EqualsAndHashCode 提供equals和hashCode方法

@NoArgsConstructor 无参构造

@AllArgsConstructor 全参构造

@RequiredArgsConstructor 制定参数构造

@Cleanup 注解需要放在流的声明上，再也不用因为忘记finally/try/catch而烦恼了

@Data 大哥，相当于@ToString,@EqualsAndHashCode,Getter以及所有非final字段的@Setter,@RequiredArgsConstructor

@Builder 建造者模式