转载自：http://www.thinksaas.cn/topics/0/249/249996.html

其中修了部分内容：删除了引用StringUtils工具的类的相关方法，还删除了Logger日志的输出，如相想看原文件，请到上页面连接处查看。在此感谢原文的作者的分享。

import java.lang.reflect.Field;

import java.lang.reflect.Modifier;

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

import org.apache.commons.beanutils.PropertyUtils;

/**

* 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 calvin

*/

public class ReflectionUtils1 {

private ReflectionUtils1() {

}

/**

*

* 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) {

e.printStackTrace();

}

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) {

e.printStackTrace();

}

}

/**

*

* 循环向上转型,获取对象的DeclaredField.

*/

protected static Field getDeclaredField(final Object object,

final String fieldName) {

return getDeclaredField(object.getClass(), fieldName);

}

/**

*

* 循环向上转型,获取类的DeclaredField.

*/

@SuppressWarnings("rawtypes")

protected static Field getDeclaredField(final Class clazz,

final String 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("rawtypes")

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("rawtypes")

public static Class getSuperClassGenricType(final Class clazz,

final int index) {

Type genType = clazz.getGenericSuperclass();

if (!(genType instanceof ParameterizedType)) {

return Object.class;

}

Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

if (index >= params.length || index < 0) {

return Object.class;

}

if (!(params[index] instanceof Class)) {

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 propertityName 要提取的属性名.

*

*/

@SuppressWarnings({ "unchecked", "rawtypes" })

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;

}

}