175 lines
5.1 KiB
Plaintext
175 lines
5.1 KiB
Plaintext
package com.bonus.core;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import org.apache.commons.beanutils.BeanUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.springframework.util.Assert;
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/**
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* 利用反射进行操作的一个工具类
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*/
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public class ReflectHelper {
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/**
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* 利用反射获取指定对象的指定属性
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*
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* @param obj
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* 目标对象
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* @param fieldName
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* 目标属性
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* @return 目标属性的值
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*/
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public static Object getFieldValue(Object obj, String fieldName) {
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Object result = null;
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Field field = ReflectHelper.getField(obj, fieldName);
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if (field != null) {
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field.setAccessible(true);
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try {
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result = field.get(obj);
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} catch (IllegalArgumentException e) {
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e.printStackTrace();
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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}
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}
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return result;
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}
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/**
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* 利用反射获取指定对象里面的指定属性
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*
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* @param obj
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* 目标对象
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* @param fieldName
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* 目标属性
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* @return 目标字段
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*/
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private static Field getField(Object obj, String fieldName) {
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Field field = null;
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for (Class<?> clazz = obj.getClass(); clazz != Object.class; clazz = clazz
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.getSuperclass()) {
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try {
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field = clazz.getDeclaredField(fieldName);
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break;
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} catch (NoSuchFieldException e) {
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// 这里不用做处理，子类没有该字段可能对应的父类有，都没有就返回null。
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}
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}
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return field;
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}
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/**
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* 利用反射设置指定对象的指定属性为指定的值
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*
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* @param obj
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* 目标对象
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* @param fieldName
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* 目标属性
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* @param fieldValue
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* 目标值
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*/
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public static void setFieldValue(Object obj, String fieldName,
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String fieldValue) {
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Field field = ReflectHelper.getField(obj, fieldName);
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if (field != null) {
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try {
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field.setAccessible(true);
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field.set(obj, fieldValue);
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} catch (IllegalArgumentException e) {
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e.printStackTrace();
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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}
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}
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}
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/**
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* 两者属性名一致时，拷贝source里的属性到dest里
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*
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* @return void
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* @throws IllegalArgumentException
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* @throws IllegalAccessException
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* @throws InvocationTargetException
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*/
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public static void copyPorperties(Object dest, Object source) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{
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Class<?> srcCla = source.getClass();
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Field[] fsF = srcCla.getDeclaredFields();
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for (Field s : fsF)
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{
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String name = s.getName();
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Object srcObj = invokeGetterMethod(source, name);
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try
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{
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BeanUtils.setProperty(dest, name, srcObj);
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}
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catch (Exception e){
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e.printStackTrace();
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}
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}
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}
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/**
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* 调用Getter方法.
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* @throws InvocationTargetException
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* @throws IllegalArgumentException
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* @throws IllegalAccessException
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*/
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public static Object invokeGetterMethod(Object target, String propertyName) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException
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{
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String getterMethodName = "get" + StringUtils.capitalize(propertyName);
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return invokeMethod(target, getterMethodName, new Class[] {},
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new Object[] {});
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}
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/**
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* 直接调用对象方法, 无视private/protected修饰符.
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* @throws InvocationTargetException
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* @throws IllegalArgumentException
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* @throws IllegalAccessException
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*/
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public static Object invokeMethod(final Object object,
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final String methodName, final Class<?>[] parameterTypes,
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final Object[] parameters) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{
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Method method = getDeclaredMethod(object, methodName, parameterTypes);
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if (method == null)
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{
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throw new IllegalArgumentException("Could not find method ["
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+ methodName + "] parameterType " + parameterTypes
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+ " on target [" + object + "]");
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}
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method.setAccessible(true);
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return method.invoke(object, parameters);
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}
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/**
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* 循环向上转型, 获取对象的DeclaredMethod.
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*
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* 如向上转型到Object仍无法找到, 返回null.
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*/
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protected static Method getDeclaredMethod(Object object, String methodName,
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Class<?>[] parameterTypes)
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{
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Assert.notNull(object, "object不能为空");
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for (Class<?> superClass = object.getClass(); superClass != Object.class; superClass = superClass
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.getSuperclass())
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{
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try{
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return superClass.getDeclaredMethod(methodName, parameterTypes);
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}
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catch (NoSuchMethodException e)
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{// NOSONAR
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// Method不在当前类定义,继续向上转型
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}
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}
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return null;
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}
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}
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