java不同类型对象之间的拷贝
场景:
1.我所谓的拷贝不是克隆
2.是不同类型但是有相同属性名,属性与属性之间类型可以不同
思路:
1.最容易想的就是反射,这边get,那边set,对的
2.利用commons的beanutils包,更容易处理,它有现成的第一层拷贝,我们利用一下,递归拷贝无数层
实现:注意看依赖哪些包和类哦
package com.core.util; import java.beans.PropertyDescriptor; import java.lang.reflect.InvocationTargetException; import org.apache.commons.beanutils.PropertyUtils; import org.apache.log4j.Logger; /** * 对象与对象深度拷贝，包括嵌套的复合类型，可以忽略类型，只要有相通的属性名 * 数组也可以处理，即便dest是一个空数组 * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2011</p> * @author 郑未 * @version 1.0 */ public class BeanUtils { private static final Logger LOG = Logger.getLogger(BeanUtils.class); /** * * @param dest 目标对象 * @param orig 原始对象 * @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) { // 类型不同 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; } } } } }
说明:
抛砖引玉,可能还考虑不周全,烦请大家测试并提出建议