重写org.apache.commons.beanutils.PropertyUtilsBean的copyPropert

gteric · 发表于 2017-1-10 06:24:50

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[1];
values[0] = 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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