[ToStringBuilder] toString()을 json형식으로 확인

• dto나 entity를 java에서 Json으로 보고 싶을 때
• public String toString() 안에 ToStringBuilder 추가

public class StudyGroup {
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;
	
	private String groupName;
	
	@Embedded
	private Address address;
	
	@ElementCollection(fetch = FetchType.EAGER)
	private Set<StudyGroupMember> members = new HashSet<>();

	public StudyGroup(String groupName, Address address, HashSet<StudyGroupMember> members) {
		this.groupName = groupName;
		this.address = address;
		this.members = members;
	}
	// ToStringBuilder 추가
	@Override
	public String toString() {
		return ToStringBuilder.reflectionToString(this, ToStringStyle.JSON_STYLE);
	}
	
}

1. gradle 의존성 설정

gradle에  commons-lang3 추가 해줘야된다.

• build.gradle

// ToStringBuilder toString Json 보기 추가
	implementation 'org.apache.commons:commons-lang3:3.12.0'