java 对象 copy ObjectCopyUtils

import org.apache.log4j.Logger; import java.lang.reflect.Field; import java.lang.reflect.Modifier; import java.security.AccessController; import java.security.PrivilegedAction; /** * 使用spring的BeanUtil.copyProperties来代替 */ @Deprecated public class ObjectCopyUtils { private static Logger logger = Logger.getLogger(ObjectCopyUtils.class.getName()); private static Object source; private static Object target; private static ObjectCopyType objectCopyType; public enum ObjectCopyType{ SOURCE_NOT_NULL, TARGET_IS_NULL, ALL } private ObjectCopyUtils(){ } /** * @param paramSource 源对象 * @param paramTarget 目标对象 * @param paramObjectCopyType 操作类型 0： 如果源对象的当前i的属性的值不为null，才copy过去. 1：如果目标对象的当前i的属性的值为null，才copy过去.2.默认，所有都copy过去 * @throws IllegalAccessException * @throws IllegalArgumentException */ public static void copyProperties(Object paramSource, Object paramTarget, ObjectCopyType paramObjectCopyType){ source = paramSource; target = paramTarget; objectCopyType = paramObjectCopyType; if(source==null || target==null || objectCopyType==null){ return; } AccessController.doPrivileged( new PrivilegedAction() { //NOSONAR public Object run() { Class objClass = source.getClass(); Class tarClass = target.getClass(); // 通过target对象的class到obj的class中逐个扫描有无相同的field类型 Field[] tarFields = tarClass.getDeclaredFields(); for(int i=0; i<tarFields.length; i++){ String fieldName = tarFields[i].getName(); try { Field objField = objClass.getDeclaredField(fieldName); objField.setAccessible(true); tarFields[i].setAccessible(true); Object sourceValue = objField.get(source); Object tarValue = tarFields[i].get(target); if(tarFields[i].getModifiers() >= Modifier.FINAL){ continue; //final 属性不能修改 } switch (objectCopyType){ case SOURCE_NOT_NULL: //如果源对象的当前i的属性的值不为空，才复制过去. if(sourceValue != null){ tarFields[i].set(target, sourceValue); } break; case TARGET_IS_NULL: //如果目标对象的当前i的属性的值为空，才复制过去. if(tarValue == null){ tarFields[i].set(target, sourceValue); } break; default: //所有复制过去 tarFields[i].set(target, sourceValue); break; } } catch (Exception e) { //NOSONAR logger.error("ObjectCopyUtils.class copyProperties error" , e); continue; } } return null; } }); }