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package win.hupubao.common.utils;
import org.apache.commons.beanutils.PropertyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* 反射的Utils函数集合. 提供访问私有变量,获取泛型类型Class,提取集合中元素的属性等Utils函数.
*
* @author lei
*/
public class ReflectionUtils {
private static Logger logger = LoggerFactory.getLogger(ReflectionUtils.class);
private ReflectionUtils() {
}
/**
* 直接读取对象属性值,无视private/protected修饰符,不经过getter函数.
*/
public static Object getFieldValue(final Object object, final String fieldName) {
Field field = getDeclaredField(object, fieldName);
if (field == null)
throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + object + "]");
makeAccessible(field);
Object result = null;
try {
result = field.get(object);
} catch (IllegalAccessException e) {
logger.error("不可能抛出的异常{}", e.getMessage());
}
return result;
}
/**
* 直接设置对象属性值,无视private/protected修饰符,不经过setter函数.
*/
public static void setFieldValue(final Object object, final String fieldName, final Object value) {
Field field = getDeclaredField(object, fieldName);
if (field == null)
throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + object + "]");
makeAccessible(field);
try {
field.set(object, value);
} catch (IllegalAccessException e) {
logger.error("不可能抛出的异常:{}", e.getMessage());
}
}
/**
* 循环向上转型,获取对象的DeclaredField.
*/
protected static Field getDeclaredField(final Object object, final String fieldName) {
Assert.notNull(object, "object不能为空");
return getDeclaredField(object.getClass(), fieldName);
}
/**
* 循环向上转型,获取类的DeclaredField.
*/
@SuppressWarnings("unchecked")
protected static Field getDeclaredField(final Class clazz, final String fieldName) {
Assert.notNull(clazz, "clazz不能为空");
Assert.hasText(fieldName, "fieldName");
for (Class superClass = clazz; superClass != Object.class; superClass = superClass.getSuperclass()) {
try {
return superClass.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
// Field不在当前类定义,继续向上转型
}
}
return null;
}
/**
* 强制转换fileld可访问.
*/
protected static void makeAccessible(final Field field) {
if (!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers())) {
field.setAccessible(true);
}
}
/**
* 通过反射,获得定义Class时声明的父类的泛型参数的类型. 如public UserDao extends HibernateDao
*
* @param clazz
* The class to introspect
* @return the first generic declaration, or Object.class if cannot be
* determined
*/
@SuppressWarnings("unchecked")
public static Class getSuperClassGenricType(final Class clazz) {
return getSuperClassGenricType(clazz, 0);
}
/**
* 通过反射,获得定义Class时声明的父类的泛型参数的类型. 如public UserDao extends
* HibernateDao
*
* @param clazz
* clazz The class to introspect
* @param index
* the Index of the generic ddeclaration,start from 0.
* @return the index generic declaration, or Object.class if cannot be
* determined
*/
@SuppressWarnings("unchecked")
public static Class getSuperClassGenricType(final Class clazz, final int index) {
Type genType = clazz.getGenericSuperclass();
if (!(genType instanceof ParameterizedType)) {
logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
return Object.class;
}
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
if (index >= params.length || index < 0) {
logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: " + params.length);
return Object.class;
}
if (!(params[index] instanceof Class)) {
logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
return Object.class;
}
return (Class) params[index];
}
/**
* 提取集合中的对象的属性,组合成List.
*
* @param collection
* 来源集合.
* @param propertyName
* 要提取的属性名.
*/
@SuppressWarnings("unchecked")
public static List fetchElementPropertyToList(final Collection collection, final String propertyName) throws Exception {
List list = new ArrayList();
for (Object obj : collection) {
list.add(PropertyUtils.getProperty(obj, propertyName));
}
return list;
}
/**
* 提取集合中的对象的属性,组合成由分割符分隔的字符串.
*
* @param collection
* 来源集合.
* @param propertyName
* 要提取的属性名.
* @param separator
* 分隔符.
*/
@SuppressWarnings("unchecked")
public static String fetchElementPropertyToString(final Collection collection, final String propertyName, final String separator) throws Exception {
List list = fetchElementPropertyToList(collection, propertyName);
return StringUtils.join(list.toArray(), separator);
}
/**
* 直接调用对象方法, 而忽略修饰符(private, protected)
* @param object
* @param methodName
* @param parameterTypes
* @param parameters
* @return
* @throws InvocationTargetException
* @throws IllegalArgumentException
*/
public static Object invokeMethod(Object object, String methodName, Class [] parameterTypes,
Object [] parameters) throws InvocationTargetException {
Method method = getDeclaredMethod(object, methodName, parameterTypes);
if(method == null){
throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + object + "]");
}
method.setAccessible(true);
try {
return method.invoke(object, parameters);
} catch(IllegalAccessException e) {
}
return null;
}
/**
* 循环向上转型, 获取对象的 DeclaredMethod
* @param object
* @param methodName
* @param parameterTypes
* @return
*/
public static Method getDeclaredMethod(Object object, String methodName, Class[] parameterTypes){
for(Class superClass = object.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()){
try {
//superClass.getMethod(methodName, parameterTypes);
return superClass.getDeclaredMethod(methodName, parameterTypes);
} catch (NoSuchMethodException e) {
//Method 不在当前类定义, 继续向上转型
}
//..
}
return null;
}
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