2个相同类型的实体类如何映射

import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.sql.Timestamp;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

/**
 * 比较2个相同类型的实体类有哪些字段值不一样,将源实体类不一样的字段
 * 值赋给目标实体类
 */
public class CompareBeanUtils {
    /**
     * @param sourceBean 源类
     * @param targetBean 目标类
     * @param ignoreArr  需要忽略的熟悉名称
     * @return
     */
    public static Object compareBean(Object sourceBean, Object targetBean, String[] ignoreArr) {
        List<String> ignoreList = null;
        if (ignoreArr != null && ignoreArr.length > 0) {
            // array转化为list
            ignoreList = Arrays.asList(ignoreArr);
        }
        Class sourceBeanClass = sourceBean.getClass();
        Class targetBeanClass = targetBean.getClass();
        Field[] sourceFields = sourceBeanClass.getDeclaredFields();
        Field[] targetFields = targetBeanClass.getDeclaredFields();
        for (int i = 0; i < sourceFields.length; i++) {
            Field sourceField = sourceFields[i];
            if (Modifier.isStatic(sourceField.getModifiers())) {
                continue;
            }
            Field targetField = targetFields[i];
            if (Modifier.isStatic(targetField.getModifiers())) {
                continue;
            }
            sourceField.setAccessible(true);
            targetField.setAccessible(true);
            try {
                if (ignoreList != null && ignoreList.contains(sourceField.getName())) {
                    continue;
                }
                if (!(sourceField.get(sourceBean) == null)
                        && !"serialVersionUID".equals(sourceField.getName().toString())) {
                    targetField.set(targetBean, sourceField.get(sourceBean));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return targetBean;
    }

    public static boolean isModify(Object obj1, Object obj2, String[] ignoreArr) {
        boolean flag = false;
        try {
            List<String> ignoreList = null;
            if (ignoreArr != null && ignoreArr.length > 0) {
                // array转化为list
                ignoreList = Arrays.asList(ignoreArr);
            }
            if (obj1.getClass() == obj2.getClass()) {
                Class clazz = obj1.getClass();
                // 获取object的属性描述
                PropertyDescriptor[] pds = Introspector.getBeanInfo(clazz,
                        Object.class).getPropertyDescriptors();
                for (PropertyDescriptor pd : pds) {
                    String name = pd.getName();// 属性名
                    if (ignoreList != null && ignoreList.contains(name)) {// 如果当前属性选择忽略比较，跳到下一次循环
                        continue;
                    }
                    Method readMethod = pd.getReadMethod();// get方法
                    // 在obj1上调用get方法等同于获得obj1的属性值
                    Object o1 = readMethod.invoke(obj1);
                    // 在obj2上调用get方法等同于获得obj2的属性值
                    Object o2 = readMethod.invoke(obj2);
                    if (o1 instanceof Timestamp) {
                        o1 = new Date(((Timestamp) o1).getTime());
                    }
                    if (o2 instanceof Timestamp) {
                        o2 = new Date(((Timestamp) o2).getTime());
                    }
                    if (!o1.equals(o2)) {
                        flag = true;
                        return flag;
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flag;
    }
}


测试用例

public static void main(String[] args) {
    Cat sourceCat = new Cat();
    sourceCat.setAge(10);
    sourceCat.setName("cat");
    sourceCat.setHigh(new BigDecimal(20));

    Cat targetCat = new Cat();
    targetCat.setAge(20);
    targetCat.setHigh(new BigDecimal(10));

    //targetCat
    Cat cat = (Cat) CompareBeanUtils.compareBean(sourceCat, targetCat, new String[]{"high"});
    System.out.println(cat);//Cat{name='cat', age=10, high=10}

}