java|JAVA对象任意深度克隆clone工具类分享

【java|JAVA对象任意深度克隆clone工具类分享】原文:JAVA对象任意深度克隆clone工具类分享
源代码下载地址:http://www.zuidaima.com/share/1550463408114688.htm
JAVA对象任意深度克隆clone工具类分享

package com.zuidaima.n_app.util; import java.lang.reflect.Constructor; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Modifier; import java.util.Arrays; import java.util.Collection; import java.util.HashSet; import java.util.Map; import java.util.Set; /** * 克隆工具类 * @author lujijiang@gmail.com www.zuidaima.com * */ public class Clone { /** * 无需进行复制的特殊类型数组 */ static Class[] needlessCloneClasses = new Class[]{String.class,Boolean.class,Character.class,Byte.class,Short.class, Integer.class,Long.class,Float.class,Double.class,Void.class,Object.class,Class.class }; /** * 判断该类型对象是否无需复制 * @param c 指定类型 * @return 如果不需要复制则返回真,否则返回假 */ private static boolean isNeedlessClone(Class c){ if(c.isPrimitive()){//基本类型 return true; } for(Class tmp:needlessCloneClasses){//是否在无需复制类型数组里 if(c.equals(tmp)){ return true; } } return false; }/** * 尝试创建新对象 * @param c 原始对象 * @return 新的对象 * @throws IllegalAccessException */ private static Object createObject(Object value) throws IllegalAccessException{ try { return value.getClass().newInstance(); } catch (InstantiationException e) { return null; } catch (IllegalAccessException e) { throw e; } }/** * 复制对象数据 * @param value 原始对象 * @param level 复制深度。小于0为无限深度,即将深入到最基本类型和Object类级别的数据复制; * 大于0则按照其值复制到指定深度的数据,等于0则直接返回对象本身而不进行任何复制行为。 * @return 返回复制后的对象 * @throws IllegalAccessException * @throws InstantiationException * @throws InvocationTargetException * @throws NoSuchMethodException */ public static Object clone(Object value,int level) throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException{ if(value=https://www.it610.com/article/=null){ return null; } if(level==0){ return value; } Class c = value.getClass(); if(isNeedlessClone(c)){ return value; } level--; if(value instanceof Collection){//复制新的集合 Collection tmp = (Collection)c.newInstance(); for(Object v:(Collection)value){ tmp.add(clone(v,level)); //深度复制 } value = tmp; } else if(c.isArray()){//复制新的Array //首先判断是否为基本数据类型 if(c.equals(int[].class)){ int[] old = (int[])value; value = (int[])Arrays.copyOf(old, old.length); } else if(c.equals(short[].class)){ short[] old = (short[])value; value = (short[])Arrays.copyOf(old, old.length); } else if(c.equals(char[].class)){ char[] old = (char[])value; value = (char[])Arrays.copyOf(old, old.length); } else if(c.equals(float[].class)){ float[] old = (float[])value; value = (float[])Arrays.copyOf(old, old.length); } else if(c.equals(double[].class)){ double[] old = (double[])value; value = (double[])Arrays.copyOf(old, old.length); } else if(c.equals(long[].class)){ long[] old = (long[])value; value = (long[])Arrays.copyOf(old, old.length); } else if(c.equals(boolean[].class)){ boolean[] old = (boolean[])value; value = (boolean[])Arrays.copyOf(old, old.length); } else if(c.equals(byte[].class)){ byte[] old = (byte[])value; value = (byte[])Arrays.copyOf(old, old.length); } else { Object[] old = (Object[])value; Object[] tmp = (Object[])Arrays.copyOf(old, old.length, old.getClass()); for(int i = 0; i fields = new HashSet(); while(c!=null&&!c.equals(Object.class)){ fields.addAll(Arrays.asList(c.getDeclaredFields())); c = c.getSuperclass(); } for(Field field:fields){ if(!Modifier.isFinal(field.getModifiers())){//仅复制非final字段 field.setAccessible(true); field.set(tmp, clone(field.get(value),level)); //深度复制 } } value = https://www.it610.com/article/tmp; } return value; }/** * 浅表复制对象 * @param value 原始对象 * @return 复制后的对象,只复制一层 * @throws IllegalAccessException * @throws InstantiationException * @throws InvocationTargetException * @throws NoSuchMethodException */ public static Object clone(Object value) throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException{ return clone(value,1); }/** * 深度复制对象 * @param value 原始对象 * @return 复制后的对象 * @throws IllegalAccessException * @throws InstantiationException * @throws InvocationTargetException * @throws NoSuchMethodException */ public static Object deepClone(Object value) throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException{ return clone(value,-1); } }


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