今天在学习的时候，学到了引用lombok，简化实体类代码的方法，
首先调用lombox

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
</dependency>

然后在pojo的实体类中加上注解

package com.muyu.pojo;

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

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User{
	private long id;
	private String name;
	private Integer age;
	private String email;
}

所达到的效果等同于这样的

package com.muyu.pojo;

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

public class User{
	private long id;
	private String name;
	private Integer age;
	private String email;

	public User() {
	}

	public User(long id, String name, Integer age, String email) {
		this.id = id;
		this.name = name;
		this.age = age;
		this.email = email;
	}

	public long getId() {
		return id;
	}

	public void setId(long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public Integer getAge() {
		return age;
	}

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

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;

		User user = (User) o;

		if (id != user.id) return false;
		if (name != null ? !name.equals(user.name) : user.name != null) return false;
		if (age != null ? !age.equals(user.age) : user.age != null) return false;
		return email != null ? email.equals(user.email) : user.email == null;
	}

	@Override
	public int hashCode() {
		int result = (int) (id ^ (id >>> 32));
		result = 31 * result + (name != null ? name.hashCode() : 0);
		result = 31 * result + (age != null ? age.hashCode() : 0);
		result = 31 * result + (email != null ? email.hashCode() : 0);
		return result;
	}

	@Override
	public String toString() {
		return "User{" +
				"id=" + id +
				", name='" + name + '\'' +
				", age=" + age +
				", email='" + email + '\'' +
				'}';
	}
}

以下是详细用法的讲解

• @Data ：注解在类上；提供类所有属性的 getting 和 setting 方法，此外还提供了equals、hashCode、toString 方法
• @Setter：注解在属性上；为属性提供 setting 方法
• @Getter：注解在属性上；为属性提供 getting 方法
• @Log4j ：注解在类上；为类提供一个 属性名为log 的 log4j 日志对象
• @NoArgsConstructor：注解在类上；为类提供一个无参的构造方法
• @AllArgsConstructor：注解在类上；为类提供一个全参的构造方法