lombok的作用和使用方法

Posted 2021-06-09 Roam-G

       lombok是一个可以通过简单的注解的形式来帮助我们简化消除一些必须有但显得很臃肿的 Java 代码的工具，

简单来说，比如我们新建了一个类，然后在其中写了几个字段，然后通常情况下我们需要手动去建立getter和setter方法啊，构造函数啊之类的，lombok的作用就是为了省去我们手动创建这些代码的麻烦，它能够在我们编译源码的时候自动帮我们生成这些方法。

 

1.依赖

    <dependency>

          <groupId>org.projectlombok</groupId>

          <artifactId>lombok</artifactId>

          <version>1.16.18</version>

          <scope>provided</scope>

    </dependency>

2.插件下载

 

在IDEA点击File-- Settings设置界面，安装Lombok插件:

 

3.使用对比

****未使用时。

package com.exam.entity;

public class Student {
//    学生
    private Integer studentId;

    private String studentName;

    private String grade;

    private String major;

    private String clazz;

    private String institute;

    private String tel;

    private String email;

    private String pwd;

    private String cardId;

    private String sex;

    private String role;

    public Integer getStudentId() {
        return studentId;
    }

    public void setStudentId(Integer studentId) {
        this.studentId = studentId;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName == null ? null : studentName.trim();
    }

    public String getGrade() {
        return grade;
    }

    public void setGrade(String grade) {
        this.grade = grade == null ? null : grade.trim();
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major == null ? null : major.trim();
    }

    public String getClazz() {
        return clazz;
    }

    public void setClazz(String clazz) {
        this.clazz = clazz == null ? null : clazz.trim();
    }

    public String getInstitute() {
        return institute;
    }

    public void setInstitute(String institute) {
        this.institute = institute == null ? null : institute.trim();
    }

    public String getTel() {
        return tel;
    }

    public void setTel(String tel) {
        this.tel = tel == null ? null : tel.trim();
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd == null ? null : pwd.trim();
    }

    public String getCardId() {
        return cardId;
    }

    public void setCardId(String cardId) {
        this.cardId = cardId == null ? null : cardId.trim();
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex == null ? null : sex.trim();
    }

    public String getRole() {
        return role;
    }

    public void setRole(String role) {
        this.role = role == null ? null : role.trim();
    }
}

****使用之后

package com.exam.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class PaperManage {
    private Integer paperId;

    private Integer questionType;

    private Integer questionId;


}

@Data 不需要写getter setter

@NoArgsConstructor

@AllArgsConstructor 有参数，无参数构造。

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