Java利用反射实现对象之间相同属性复制

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package com.utils;import java.lang.reflect.Method;import java.util.Arrays;import java.util.Collection;import java.util.List;/** * @ClassName: BeanUtil.java * * @Description: BeanUtil * * @author GERRARD * * @date 2015年1月19日下午1:38:19 *  */public final class BeanUtil {/** * 利用反射实现对象之间相同属性复制 *  * @param source 要复制的 * @param to 复制给 */public static void copyProperties(Object source, Object target) throws Exception {copyPropertiesExclude(source, target, null);}/** * 复制对象属性 *  * @param from * @param to * @param excludsArray *            排除属性列表 * @throws Exception */public static void copyPropertiesExclude(Object from, Object to,String[] excludsArray) throws Exception {List<String> excludesList = null;if (excludsArray != null && excludsArray.length > 0) {excludesList = Arrays.asList(excludsArray); // 构造列表对象}Method[] fromMethods = from.getClass().getDeclaredMethods();Method[] toMethods = to.getClass().getDeclaredMethods();Method fromMethod = null, toMethod = null;String fromMethodName = null, toMethodName = null;for (int i = 0; i < fromMethods.length; i++) {fromMethod = fromMethods[i];fromMethodName = fromMethod.getName();if (!fromMethodName.contains("get"))continue;// 排除列表检测if (excludesList != null&& excludesList.contains(fromMethodName.substring(3).toLowerCase())) {continue;}toMethodName = "set" + fromMethodName.substring(3);toMethod = findMethodByName(toMethods, toMethodName);if (toMethod == null)continue;Object value = fromMethod.invoke(from, new Object[0]);if (value == null)continue;// 集合类判空处理if (value instanceof Collection) {Collection<?> newValue = (Collection<?>) value;if (newValue.size() <= 0)continue;}toMethod.invoke(to, new Object[] { value });}}/** * 对象属性值复制，仅复制指定名称的属性值 *  * @param from * @param to * @param includsArray * @throws Exception */public static void copyPropertiesInclude(Object from, Object to,String[] includsArray) throws Exception {List<String> includesList = null;if (includsArray != null && includsArray.length > 0) {includesList = Arrays.asList(includsArray); } else {return;}Method[] fromMethods = from.getClass().getDeclaredMethods();Method[] toMethods = to.getClass().getDeclaredMethods();Method fromMethod = null, toMethod = null;String fromMethodName = null, toMethodName = null;for (int i = 0; i < fromMethods.length; i++) {fromMethod = fromMethods[i];fromMethodName = fromMethod.getName();if (!fromMethodName.contains("get"))continue;// 排除列表检测String str = fromMethodName.substring(3);if (!includesList.contains(str.substring(0, 1).toLowerCase()+ str.substring(1))) {continue;}toMethodName = "set" + fromMethodName.substring(3);toMethod = findMethodByName(toMethods, toMethodName);if (toMethod == null)continue;Object value = fromMethod.invoke(from, new Object[0]);if (value == null)continue;// 集合类判空处理if (value instanceof Collection) {Collection<?> newValue = (Collection<?>) value;if (newValue.size() <= 0)continue;}toMethod.invoke(to, new Object[] { value });}}/** * 从方法数组中获取指定名称的方法 *  * @param methods * @param name * @return */public static Method findMethodByName(Method[] methods, String name) {for (int j = 0; j < methods.length; j++) {if (methods[j].getName().equals(name)) {return methods[j];}}return null;}}
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