如何在Spring boot中使用JPA中的条件？

import org.springframework.data.jpa.domain.Specification;

public class CustomSpecification<T> implements Specification<T> {
    // 实现Specification接口的toPredicate方法
    @Override
    public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        // 构建查询条件
        // 示例：根据某个属性进行等值查询
        return criteriaBuilder.equal(root.get("propertyName"), propertyValue);
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.stereotype.Service;

@Service
public class MyService {
    @Autowired
    private MyRepository myRepository;

    public List<MyEntity> findByCondition() {
        Specification<MyEntity> spec = new CustomSpecification<>();
        return myRepository.findAll(spec);
    }
}

import org.springframework.data.jpa.domain.Specification;

public class CustomSpecification<T> implements Specification<T> {
    @Override
    public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        // 示例：根据多个条件进行查询
        Predicate predicate = criteriaBuilder.conjunction();
        if (condition1) {
            predicate.getExpressions().add(criteriaBuilder.equal(root.get("propertyName1"), propertyValue1));
        }
        if (condition2) {
            predicate.getExpressions().add(criteriaBuilder.like(root.get("propertyName2"), "%" + propertyValue2 + "%"));
        }
        // 更多条件...

        return predicate;
    }
}