true
Person{name='people'}

import org.springframework.beans.BeanUtils;public class Test {public static void main(String[] args) {Person person = new Person("people");Male male = new Male();BeanUtils.copyProperties(person, male);System.out.println(Male.class.isInstance(male));System.out.println(male);}
}class Person {private String name;public Person() {}public Person(String name) {this.name = name;}public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic String toString() {return "Person{" +"name='" + name + '\'' +'}';}
}class Male extends Person {private String necklace;public Male() {}public Male(String name) {super(name);}public String getNecklace() {return necklace;}public void setNecklace(String necklace) {this.necklace = necklace;}
}

    /*** Copy the property values of the given source bean into the target bean.* <p>Note: The source and target classes do not have to match or even be derived* from each other, as long as the properties match. Any bean properties that the* source bean exposes but the target bean does not will silently be ignored.* <p>This is just a convenience method. For more complex transfer needs,* consider using a full BeanWrapper.* @param source the source bean* @param target the target bean* @throws BeansException if the copying failed* @see BeanWrapper*/public static void copyProperties(Object source, Object target) throws BeansException {copyProperties(source, target, null, (String[]) null);}

    /*** Copy the property values of the given source bean into the given target bean.* <p>Note: The source and target classes do not have to match or even be derived* from each other, as long as the properties match. Any bean properties that the* source bean exposes but the target bean does not will silently be ignored.* @param source the source bean* @param target the target bean* @param editable the class (or interface) to restrict property setting to* @param ignoreProperties array of property names to ignore* @throws BeansException if the copying failed* @see BeanWrapper*/private static void copyProperties(Object source, Object target, Class<?> editable, String... ignoreProperties)throws BeansException {Assert.notNull(source, "Source must not be null");Assert.notNull(target, "Target must not be null");Class<?> actualEditable = target.getClass();if (editable != null) {if (!editable.isInstance(target)) {throw new IllegalArgumentException("Target class [" + target.getClass().getName() +"] not assignable to Editable class [" + editable.getName() + "]");} actualEditable = editable;//如果editable赋值，则ignore Target中的字段属性}PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);List<String> ignoreList = (ignoreProperties != null ? Arrays.asList(ignoreProperties) : null);for (PropertyDescriptor targetPd : targetPds) {Method writeMethod = targetPd.getWriteMethod();if (writeMethod != null && (ignoreList == null || !ignoreList.contains(targetPd.getName()))) {PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());if (sourcePd != null) {Method readMethod = sourcePd.getReadMethod();if (readMethod != null &&ClassUtils.isAssignable(writeMethod.getParameterTypes()[0], readMethod.getReturnType())) {try {if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {readMethod.setAccessible(true);}Object value = readMethod.invoke(source);if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {writeMethod.setAccessible(true);}writeMethod.invoke(target, value);}catch (Throwable ex) {throw new FatalBeanException("Could not copy property '" + targetPd.getName() + "' from source to target", ex);}}}}}}