場景:

    1.我所謂的拷貝不是克隆

    2.是不同型別但是有相同屬性名,屬性與屬性之間型別可以不同

思路:

    1.最容易想的就是反射,這邊get,那邊set,對的

    2.利用commons的beanutils包,更容易處理,它有現成的第一層拷貝,我們利用一下,遞迴拷貝無數層

實現:注意看依賴哪些包和類哦

    package com.core.util; import java.beans.PropertyDescriptor; import java.lang.reflect.InvocationTargetException; import org.apache.commons.beanutils.PropertyUtils; import org.apache.log4j.Logger; /** * 物件與物件深度拷貝，包括巢狀的複合型別，可以忽略型別，只要有相通的屬性名 * 陣列也可以處理，即便dest是一個空陣列 * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2011</p> * @author 鄭未 * @version 1.0 */ public class BeanUtils { private static final Logger LOG = Logger.getLogger(BeanUtils.class); /** * * @param dest 目標物件 * @param orig 原始物件 * @throws Exception */ public static void copy(Object dest, Object orig) throws Exception { if (dest == null) { throw new IllegalArgumentException("No destination bean specified"); } if (orig == null) { throw new IllegalArgumentException("No origin bean specified"); } Class origClass = orig.getClass(); Class destClass = dest.getClass(); if (origClass == String.class || origClass.isPrimitive()) { dest = orig; } if(orig.getClass().isArray()){ Object[] destArr = (Object[]) dest; Object[] origArr = (Object[]) orig; Class elemenClass = destArr.getClass().getComponentType(); for(int i=0;i<origArr.length;i++){ if(destArr[i]==null){ destArr[i] = elemenClass.newInstance(); } copy(destArr[i], origArr[i]); } } String classLogInfo = "origClass:"+origClass.getName()+",destClass:"+destClass.getName()+","; PropertyDescriptor[] origDescriptors = PropertyUtils .getPropertyDescriptors(orig); for (int i = 0; i < origDescriptors.length; i++) { String name = origDescriptors[i].getName(); if ("class".equals(name)) { continue; } Object value = null; if (PropertyUtils.isReadable(orig, name) && PropertyUtils.isWriteable(dest, name)) { try { value = PropertyUtils.getSimpleProperty(orig, name); PropertyUtils.setSimpleProperty(dest, name, value); } catch (IllegalArgumentException e) { // 型別不同 try { PropertyDescriptor targetDescriptor = PropertyUtils .getPropertyDescriptor(dest, name); Object new_value = targetDescriptor.getPropertyType() .newInstance(); copy(new_value, value); // LOG.info(new_value); PropertyUtils.setSimpleProperty(dest, name, new_value); }catch(IllegalArgumentException e1){ // } catch (IllegalAccessException e1) { throw e1; } catch (InvocationTargetException e1) { throw e1; } catch (NoSuchMethodException e1) { throw e1; } catch (InstantiationException e1) { throw e1; } } catch (NoSuchMethodException e) { throw e; } catch (IllegalAccessException e) { throw e; } catch (InvocationTargetException e) { throw e; } } } } }

說明:

    拋磚引玉,可能還考慮不周全,煩請大家測試並提出建議