java中Javers 比较两个类的差异

 <!-- https://mvnrepository.com/artifact/org.javers/javers-core -->
        <dependency>
            <groupId>org.javers</groupId>
            <artifactId>javers-core</artifactId>
            <version>6.6.2</version>
        </dependency>

Javers javers = JaversBuilder.javers().build();
Diff diff = javers.compare(oldObject,newObject)
boolean flag = diff.hasChange();
//diff会在控制台打印出两个类之间的异同，相同不打印数据，不同会展示出修改前后的数据
//diff.hasChange(); 如果两个类完全相同，返回值为flase，两个类不同，返回值为true

public static void main(String[] args) {
        Javers build = JaversBuilder.javers().build();
        //A系统的类
        //数据库中的数据
        PromotionDetail promotionDetail = new PromotionDetail();
        promotionDetail.setCanEditFlag(true);
        promotionDetail.setAllGoodsCountType(1);
        promotionDetail.setName("name1");
        PromotionGoods promotionGoods = new PromotionGoods();
        promotionGoods.setCount(1);
        promotionGoods.setDeptName("deptname1");
        PromotionGoods promotionGoods1 = new PromotionGoods();
        promotionGoods1.setCount(2);
        promotionGoods1.setDeptName("deptname2");
        List<PromotionGoods> list = new ArrayList<>();
        list.add(promotionGoods);
        list.add(promotionGoods1);
        promotionDetail.setGoods(list);

        //新数据
        PromotionDetail promotionDetail1 = new PromotionDetail();
        promotionDetail1.setCanEditFlag(true);
        promotionDetail1.setAllGoodsCountType(1);
        promotionDetail1.setName("name2");
        PromotionGoods promotionGoods2 = new PromotionGoods();
        promotionGoods2.setCount(5);
        promotionGoods2.setDeptName("deptname3");
        PromotionGoods promotionGoods3 = new PromotionGoods();
        promotionGoods3.setCount(4);
        promotionGoods3.setDeptName("deptname3");
        List<PromotionGoods> list0 = new ArrayList<>();
        list0.add(promotionGoods2);
        list0.add(promotionGoods3);
        promotionDetail1.setGoods(list0);

        Diff compare = build.compare(promotionDetail, promotionDetail1);
        boolean b = compare.hasChanges();
        System.out.println(compare);
        System.out.println(b);
    }

public class BigDecimalComparatorWithFixedEquals implements CustomValueComparator<BigDecimal> {
    @Override
    public boolean equals(BigDecimal a, BigDecimal b) {
        return a.compareTo(b) == 0;
    }

Javers javers = JaversBuilder.javers().reGISterValue(BigDecimal.class,new BigDecimalComparatorWithFixedEquals()).build();

public class EfDateComparator implements CustomValueComparator<Date> {
    @Override
    public boolean equals(Date a, Date b) {
        return a.getTime() == b.getTime();
    }

Javers javers = JaversBuilder.javers().registerValue(BigDecimal.class,new BigDecimalComparatorWithFixedEquals()).build();
Javers javers = JaversBuilder.javers()
    .registerValue(BigDecimal.class,new BigDecimalComparatorWithFixedEquals())
    .registerValue(BigDecimal.class,new BigDecimalComparatorWithFixedEquals())
    .build();

//在一个类中，在字段上添加该注解，该类中只比较有注解的字段
@DiffInclude

//在一个类中，在字段上添加该注解，该类中忽略比较有注解的字段
@DiffIgnore

//PS:两个注解不可以同时出现在一个类中