重写org.apache.commons.beanutils.PropertyUtilsBean的copyPropert
在使用用struts的actionForm时要把属性拷到BO对象时发现org.apache.commons.beanutils.PropertyUtilsBean的copyPropert有些问题:如不能把字符字符串转为Long类型(作为公共工具类本应是这样)为了适应开发需要我重写了copyPropert方法.下面贴出来java 代码[*]package com.zhgrd.basic.util;
[*]
[*]import java.beans.PropertyDescriptor;
[*]import java.lang.reflect.InvocationTargetException;
[*]import java.lang.reflect.Method;
[*]import java.util.Iterator;
[*]import java.util.Map;
[*]
[*]import org.apache.commons.beanutils.BeanUtilsBean;
[*]import org.apache.commons.beanutils.ContextClassLoaderLocal;
[*]import org.apache.commons.beanutils.DynaBean;
[*]import org.apache.commons.beanutils.DynaProperty;
[*]import org.apache.commons.beanutils.PropertyUtils;
[*]import org.apache.commons.beanutils.PropertyUtilsBean;
[*]import org.apache.commons.logging.Log;
[*]import org.apache.commons.logging.LogFactory;
[*]/**
[*] * 是基于org.apache.commons.beanutils的
[*] * 便于把form中的值拷到Bo对象中
[*] * 如Bo中没有的属性在form中存在则不拷贝，
[*] * 如果目标对象中的属性类型为Long型而拷贝对象为String则把String转为Long
[*] * @author ou
[*] *
[*] */
[*]public class ObjectPropertyUtilsBean extends PropertyUtilsBean{
[*] Log log = LogFactory.getLog(ObjectPropertyUtilsBean.class);
[*]
[*]
[*] private static final ContextClassLoaderLocal beansByClassLoader = new ContextClassLoaderLocal() {
[*] // Creates the default instance used when the context classloader is unavailable
[*] protected Object initialValue() {
[*] return new ObjectPropertyUtilsBean();
[*] }
[*] };
[*] public static ObjectPropertyUtilsBean getInstance(){
[*] return (ObjectPropertyUtilsBean)beansByClassLoader.get();
[*] }
[*] public void copyProperties(Object dest, Object orig)
[*] throws IllegalAccessException, InvocationTargetException,
[*] NoSuchMethodException {
[*]
[*] if (dest == null) {
[*] throw new IllegalArgumentException ("目标对象为空");
[*] }
[*] if (orig == null) {
[*] throw new IllegalArgumentException("没有拷贝对象");
[*] }
[*]
[*] if (orig instanceof DynaBean) {
[*] DynaProperty origDescriptors[] =
[*] ((DynaBean) orig).getDynaClass().getDynaProperties();
[*] for (int i = 0; i < origDescriptors.length; i++) {
[*] String name = origDescriptors.getName();
[*] if (dest instanceof DynaBean) {
[*] if (isWriteable(dest, name)) {
[*] Object value = ((DynaBean) orig).get(name);
[*] ((DynaBean) dest).set(name, value);
[*] }
[*] } else /* if (dest是一个标准的JavaBean) */ {
[*] if (isWriteable(dest, name)) {
[*] Object value = ((DynaBean) orig).get(name);
[*] setSimpleProperty(dest, name, value);
[*] }
[*] }
[*] }
[*] } else if (orig instanceof Map) {
[*] Iterator names = ((Map) orig).keySet().iterator();
[*] while (names.hasNext()) {
[*] String name = (String) names.next();
[*] if (dest instanceof DynaBean) {
[*] if (isWriteable(dest, name)) {
[*] Object value = ((Map) orig).get(name);
[*] ((DynaBean) dest).set(name, value);
[*] }
[*] } else /* if (dest is a standard JavaBean) */ {
[*] if (isWriteable(dest, name)) {
[*] Object value = ((Map) orig).get(name);
[*] setSimpleProperty(dest, name, value);
[*] }
[*] }
[*] }
[*] } else /* if (orig is a standard JavaBean) */ {
[*] PropertyDescriptor origDescriptors[] =
[*] getPropertyDescriptors(orig);
[*] for (int i = 0; i < origDescriptors.length; i++) {
[*] String name = origDescriptors.getName();
[*] if (isReadable(orig, name)) {
[*] if (dest instanceof DynaBean) {
[*] if (isWriteable(dest, name)) {
[*] Object value = getSimpleProperty(orig, name);
[*] ((DynaBean) dest).set(name, value);
[*] }
[*] } else /* if (dest is a standard JavaBean) */ {
[*] if (isWriteable(dest, name)) {
[*] Object value = getSimpleProperty(orig, name);
[*] setSimpleProperty(dest, name, value);
[*] }
[*] }
[*] }
[*] }
[*] }
[*]
[*] }
[*]
[*]
[*]
[*] public void setSimpleProperty(Object bean,String name, Object value)throws IllegalAccessException, InvocationTargetException,
[*] NoSuchMethodException {
[*]
[*] if (bean == null) {
[*] throw new IllegalArgumentException("对象为空");
[*] }
[*] if (name == null) {
[*] throw new IllegalArgumentException("属性名为空");
[*] }
[*]
[*] // Validate the syntax of the property name
[*] if (name.indexOf(PropertyUtils.NESTED_DELIM) >= 0) {
[*] throw new IllegalArgumentException ("属性名不规范");
[*] } else if (name.indexOf(PropertyUtils.INDEXED_DELIM) >= 0) {
[*] throw new IllegalArgumentException("属性名不规范");
[*] } else if (name.indexOf(PropertyUtils.MAPPED_DELIM) >= 0) {
[*] throw new IllegalArgumentException ("属性名不规范");
[*] }
[*]
[*] // Handle DynaBean instances specially
[*] if (bean instanceof DynaBean) {
[*] DynaProperty descriptor =((DynaBean) bean).getDynaClass().getDynaProperty(name);
[*] if (descriptor == null) {//不存在该属性
[*] return;
[*] }
[*] ((DynaBean) bean).set(name, value);
[*] return;
[*] }
[*]
[*] // Retrieve the property setter method for the specified property
[*] PropertyDescriptor descriptor = getPropertyDescriptor(bean, name);
[*] if (descriptor == null) {//不存在该属性
[*] return;
[*] }
[*] Method writeMethod = getWriteMethod(descriptor);
[*] if (writeMethod == null) {
[*] throw new NoSuchMethodException("属性 '" + name + "' 没有Setter方法");
[*] }
[*] Class cl = getPropertyType(bean, name);
[*] if(value != null)/*在这你可加上把复制对象属性转为目标类属性的代码*/
[*] if(!cl.getName().equals(value.getClass().getName())){
[*] if(cl.getName().equals(Long.class.getName())){
[*] if(value.getClass().getName().equals(String.class.getName()))
[*] value = Long.valueOf((String)value);
[*]
[*] }
[*] }
[*]
[*] // Call the property setter method
[*] Object values[] = new Object;
[*] values = value;
[*] invokeMethod(writeMethod, bean, values);
[*]
[*] }
[*]
[*] private Object invokeMethod(
[*] Method method,
[*] Object bean,
[*] Object[] values)
[*] throws
[*] IllegalAccessException,
[*] InvocationTargetException {
[*] try {
[*]
[*] return method.invoke(bean, values);
[*]
[*] } catch (IllegalArgumentException e) {
[*]
[*] log.error("方法反射失败.", e);
[*] throw new IllegalArgumentException(
[*] "不能反射: " + method.getDeclaringClass().getName() + "."
[*] + method.getName() + " - " + e.getMessage());
[*]
[*] }
[*] }
[*]
[*]
[*]}
下面还要写一个类PropertyUtil爆露一个静态方法来使用copyPropertjava 代码
[*]package com.zhgrd.basic.util;
[*]
[*]import java.lang.reflect.InvocationTargetException;
[*]import org.apache.commons.beanutils.PropertyUtils;
[*]
[*]
[*]public class PropertyUtil extends PropertyUtils{
[*] public static void copyProperties(Object dest, Object orig) throws IllegalAccessException, InvocationTargetException,
[*] NoSuchMethodException {
[*] ObjectPropertyUtilsBean.getInstance().copyProperties(dest, orig);
[*] }
[*]}
好了现在可以使用了.java 代码
[*] SysUserForm tform = (SysUserForm)form;
[*] try{
[*] PropertyUtil.copyProperties(tsysUser, tform);
[*] }catch(Exception ex){
[*] logger.debug("属性拷贝异常：");
[*] ex.printStackTrace();
[*]}
仅供学习.本人不保证上面代码正确.
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