The whole process and detailed usage of Spring Boot integrating Lombok

introduce

Lombok is a Java library that simplifies writing Java code through annotations. It can automatically generate some common methods and codes for us, such as getter and setter methods, constructors, and toString() methods. Using Lombok in Spring Boot projects can greatly reduce redundant code, making the code more concise and easier to maintain.

This article will introduce how to integrate Lombok in a Spring Boot project, and explain in detail the common annotations and usage of Lombok.

Integration steps

Step 1: Add Lombok dependency

pom.xmlFirst, add the following Lombok dependencies to your Spring Boot project files:

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.20</version>
    <scope>provided</scope>
</dependency>

In this way, Lombok will be introduced into your project.

Step 2: Enable Lombok annotation processor

Next, you need to enable the Lombok annotation processor in the IDE. Different IDEs have different configuration methods. Here is IntelliJ IDEA as an example:

In IntelliJ IDEA, open Settings and select "Plugins". Search for the "Lombok" plug-in and install it. After restarting the IDE, Lombok will take effect.

Step 3: Use Lombok annotations

Now you can start using Lombok annotations in your code. The following are some commonly used Lombok annotations and their usage:

1、@Data: This annotation automatically generates getter and setter methods, equals()and hashCode()methods for all properties, as well as a default no-argument constructor.

@Data
public class User {
    private String name;
    private int age;
}

The above code is equivalent to handwriting the following:

public class User {
    private String name;
    private int age;

    public User() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        User user = (User) o;
        return age == user.age && Objects.equals(name, user.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }
}

 2. @Getterand @Setter: Generate getter and setter methods for attributes.

@Getter
@Setter
public class User {
    private String name;
    private int age;
}

 3. @NoArgsConstructor: Generate a constructor without parameters.

@NoArgsConstructor
public class User {
    private String name;
    private int age;
}

In addition, Lombok has many other useful annotations, such as @AllArgsConstructor(generate a constructor containing all parameters) and @ToString(generate toString()method). You can choose to use it according to your needs.

in conclusion

By integrating Lombok, we can greatly reduce the amount of redundant code written in Spring Boot projects, making the code more concise and easier to maintain. This article introduces how to integrate Lombok in a Spring Boot project, and explains in detail Lombok's common annotations and their usage. You can choose appropriate Lombok annotations according to your needs to simplify code writing. Hope this article helps you!