在属性名称相同的所有情况下，将属性值从源复制到目标。
/* * Copyright 2004-2010 the Seasar Foundation and the Others. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific language * governing permissions and limitations under the License. */ import java.util.Iterator;/*来 自 nowjava.com*/ import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import javax.servlet.http.HttpServletRequest; public class Main{ public static void main(String[] argv) throws Exception{ Object src = "nowjava.com"; Object dest = "nowjava.com"; copy(src,dest); } private static final CopyOptions DEFAULT_OPTIONS = new CopyOptions(); private static ConcurrentHashMap<String, BeanDesc> beanDescCache = new ConcurrentHashMap<String, BeanDesc>( 200); private static volatile boolean initialized = false; /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination */ public static void copy(Object src, Object dest) { copy(src, dest, DEFAULT_OPTIONS);//来自 n o w j a v a . c o m - 时 代 Java } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination * @param options * the copy options * @throws NullPointerException * if the src parameter is null or if the dest parameter is null * or if the options parameter is null */ public static void copy(Object src, Object dest, CopyOptions options) throws NullPointerException { if (src == null) { throw new NullPointerException("The src parameter is null."); } if (dest == null) { throw new NullPointerException("The dest parameter is null."); } if (options == null) { throw new NullPointerException("The options parameter is null."); } BeanDesc srcBeanDesc = getBeanDesc(src.getClass()); BeanDesc destBeanDesc = getBeanDesc(dest.getClass()); int size = srcBeanDesc.getPropertyDescSize(); for (int i = 0; i < size; i++) { PropertyDesc srcPropertyDesc = srcBeanDesc.getPropertyDesc(i); String propertyName = srcPropertyDesc.getName(); if (!srcPropertyDesc.isReadable() || !options.isTargetProperty(propertyName)) { continue; } PropertyDesc destPropertyDesc = destBeanDesc .getPropertyDesc(propertyName); if (destPropertyDesc == null) { continue; } if (!destPropertyDesc.isWritable()) { continue; } Object value = srcPropertyDesc.getValue(src); if (!options.isTargetValue(value)) { continue; } value = options.convertValue(value, propertyName, destPropertyDesc.getPropertyClass()); destPropertyDesc.setValue(dest, value); } } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination */ @SuppressWarnings("unchecked") public static void copy(Object src, Map dest) { copy(src, dest, DEFAULT_OPTIONS); } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination * @param options * the copy options * @throws NullPointerException * if the src parameter is null or if the dest parameter is null * or if the options parameter is null */ @SuppressWarnings("unchecked") public static void copy(Object src, Map dest, CopyOptions options) throws NullPointerException { if (src == null) { throw new NullPointerException("The src parameter is null."); } if (dest == null) { throw new NullPointerException("The dest parameter is null."); } if (options == null) { throw new NullPointerException("The options parameter is null."); } BeanDesc srcBeanDesc = getBeanDesc(src.getClass()); int size = srcBeanDesc.getPropertyDescSize(); for (int i = 0; i < size; i++) { PropertyDesc srcPropertyDesc = srcBeanDesc.getPropertyDesc(i); String propertyName = srcPropertyDesc.getName(); if (!srcPropertyDesc.isReadable() || !options.isTargetProperty(propertyName)) { continue; } Object value = srcPropertyDesc.getValue(src); if (!options.isTargetValue(value)) { continue; } value = options.convertValue(value, propertyName, null); dest.put(propertyName, value); } } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination */ @SuppressWarnings("unchecked") public static void copy(Map src, Object dest) { copy(src, dest, DEFAULT_OPTIONS); } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination * @param options * the copy options * @throws NullPointerException * if the src parameter is null or if the dest parameter is null * or if the options parameter is null */ @SuppressWarnings("unchecked") public static void copy(Map src, Object dest, CopyOptions options) throws NullPointerException { if (src == null) { throw new NullPointerException("The src parameter is null."); } if (dest == null) { throw new NullPointerException("The dest parameter is null."); } if (options == null) { throw new NullPointerException("The options parameter is null."); } BeanDesc destBeanDesc = getBeanDesc(dest.getClass()); for (Iterator<String> i = src.keySet().iterator(); i.hasNext();) { String propertyName = i.next(); if (!options.isTargetProperty(propertyName)) { continue; } PropertyDesc destPropertyDesc = destBeanDesc .getPropertyDesc(propertyName); if (destPropertyDesc == null) { continue; } if (!destPropertyDesc.isWritable()) { continue; } Object value = src.get(propertyName); if (!options.isTargetValue(value)) { continue; } value = options.convertValue(value, propertyName, destPropertyDesc.getPropertyClass()); destPropertyDesc.setValue(dest, value); } } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination */ @SuppressWarnings("unchecked") public static void copy(Map src, Map dest) { copy(src, dest, DEFAULT_OPTIONS); } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination * @param options * the copy options * @throws NullPointerException * if the src parameter is null or if the dest parameter is null * or if the options parameter is null */ @SuppressWarnings("unchecked") public static void copy(Map src, Map dest, CopyOptions options) throws NullPointerException { if (src == null) { throw new NullPointerException("The src parameter is null."); } if (dest == null) { throw new NullPointerException("The dest parameter is null."); } if (options == null) { throw new NullPointerException("The options parameter is null."); } for (Iterator<String> i = src.keySet().iterator(); i.hasNext();) { String propertyName = i.next(); if (!options.isTargetProperty(propertyName)) { continue; } Object value = src.get(propertyName); if (!options.isTargetValue(value)) { continue; } value = options.convertValue(value, propertyName, null); dest.put(propertyName, value); } } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination */ public static void copy(HttpServletRequest src, Object dest) { copy(src, dest, DEFAULT_OPTIONS); } /** * Copies property values from the source to the destination for all cases * where the property names are the same. Even if the property type of the * source is different from the one of the destination, the value is * converted appropriately. * * @param src * the source * @param dest * the destination * @param options * the copy options * @throws NullPointerException * if the src parameter is null */ public static void copy(HttpServletRequest src, Object dest, CopyOptions options) throws NullPointerException { if (src == null) { throw new NullPointerException("The src parameter is null."); } copy(new RequestMap(src), dest, options); }