- debug变量相关的方法都被废弃掉了。private static int debug = 0;
2、public static void copyProperties(Object dest, Object orig) 从一个对象复制属性到另一个对象上，只要属性名相同即可。
public class BeanUtils {
public static void copyProperties(Object dest, Object orig) throws IllegalAccessException, InvocationTargetException {
BeanUtilsBean.getInstance().copyProperties(dest, orig);
}
}
public class BeanUtilsBean {
private static final ContextClassLoaderLocal<BeanUtilsBean>
BEANS_BY_CLASSLOADER = new ContextClassLoaderLocal<BeanUtilsBean>() {
@Override
protected BeanUtilsBean initialValue() {
return new BeanUtilsBean();
}
};
public static BeanUtilsBean getInstance() {
return BEANS_BY_CLASSLOADER.get();
}
private final PropertyUtilsBean propertyUtilsBean = new PropertyUtilsBean();
public void copyProperties(Object dest, Object orig)
throws IllegalAccessException, InvocationTargetException {
if (orig instanceof Map) {
Map<String, Object> propMap = (Map<String, Object>) orig;
for (Map.Entry<String, Object> entry : propMap.entrySet()) {
String name = entry.getKey();
if (getPropertyUtils().isWriteable(dest, name)) {
copyProperty(dest, name, entry.getValue());
}
}
} else /* if (orig is a standard JavaBean) */ {
PropertyDescriptor[] origDescriptors =
getPropertyUtils().getPropertyDescriptors(orig);
for (int i = 0; i < origDescriptors.length; i++) {
String name = origDescriptors[i].getName();
if ("class".equals(name)) {
continue; // No point in trying to set an object's class
}
if (getPropertyUtils().isReadable(orig, name) &&
getPropertyUtils().isWriteable(dest, name)) {
try {
Object value =
getPropertyUtils().getSimpleProperty(orig, name);
copyProperty(dest, name, value);
} catch (NoSuchMethodException e) {
// Should not happen
}
}
}
}
}
public PropertyUtilsBean getPropertyUtils() {
return propertyUtilsBean;
}
}
public class ContextClassLoaderLocal<T> {
public synchronized T get() {
valueByClassLoader.isEmpty();
try {
ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
if (contextClassLoader != null) {
T value = valueByClassLoader.get(contextClassLoader);
if ((value == null)
&& !valueByClassLoader.containsKey(contextClassLoader)) {
value = initialValue();
valueByClassLoader.put(contextClassLoader, value);
}
return value;
}
} catch (SecurityException e) { /* SWALLOW - should we log this? */ }
if (!globalValueInitialized) {
globalValue = initialValue();
globalValueInitialized = true;
}
return globalValue;
}
}
public class PropertyUtilsBean {
public boolean isWriteable(Object bean, String name) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
Student student = new Student();
PropertyDescriptor desc =
getPropertyDescriptor(bean, name);
if (desc != null) {
Method writeMethod = getWriteMethod(bean.getClass(), desc);
if (writeMethod == null) {
if (desc instanceof IndexedPropertyDescriptor) {
writeMethod = ((IndexedPropertyDescriptor) desc).getIndexedWriteMethod();
} else if (desc instanceof MappedPropertyDescriptor) {
writeMethod = ((MappedPropertyDescriptor) desc).getMappedWriteMethod();
}
writeMethod = MethodUtils.getAccessibleMethod(bean.getClass(), writeMethod);
}
return (writeMethod != null);
} else {
return (false);
}
}
public boolean isReadable(Object bean, String name) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
Student student = new Student();
student.setName("yhq");
student.setAge(24);
PropertyDescriptor desc = getPropertyDescriptor(student, "integerage");
if (desc != null) {
Method readMethod = getReadMethod(student.getClass(), desc);
if (readMethod == null) {
if (desc instanceof IndexedPropertyDescriptor) {
readMethod = ((IndexedPropertyDescriptor) desc).getIndexedReadMethod();
} else if (desc instanceof MappedPropertyDescriptor) {
readMethod = ((MappedPropertyDescriptor) desc).getMappedReadMethod();
}
readMethod = MethodUtils.getAccessibleMethod(student.getClass(), readMethod);
}
return (readMethod != null);
} else {
return (false);
}
}
public static Method getReadMethod(Class<?> clazz, PropertyDescriptor descriptor) {
return (MethodUtils.getAccessibleMethod(clazz, descriptor.getReadMethod()));
}
public Method getWriteMethod(Class<?> clazz, PropertyDescriptor descriptor) {
BeanIntrospectionData data = getIntrospectionData(clazz);
return (MethodUtils.getAccessibleMethod(clazz,
data.getWriteMethod(clazz, descriptor)));
}
}
4、copyProperty(Object bean, String name, Object value)，给bean对的的name属性赋value值
public static void copyProperty(Object bean, String name, Object value)
throws IllegalAccessException, InvocationTargetException {
BeanUtilsBean.getInstance().copyProperty(bean, name, value);
}
5、public static Map<String, String> describe(Object bean) 返回一个map，key是熟悉名，value是值
6、public static String[] getArrayProperty(Object bean, String name) 返回String数组，name是属性名，将该属性的值赋值给String[0]，再返回数组。
7、public static String getIndexedProperty(Object bean, String name) 返回指定索引属性的值。
List<String> list = new ArrayList<>();
list.add("aaa");
list.add("bbb");
student.setList(list);
String property23 = BeanUtils.getProperty(student, "list[0]");
String property33 = BeanUtils.getIndexedProperty(student, "list[0]");
String property34 = BeanUtils.getIndexedProperty(student, "list",0);
System.out.println(property23);
System.out.println(property33);
System.out.println(property34);
8、public static String getMappedProperty(Object bean, String name)
Map<String,String> map = new HashMap<String,String>();
map.put("111","aaa");
map.put("222","bbb");
student.setMap(map);
String list1 = BeanUtils.getMappedProperty(student, "map(111)");