主要思路是继承BeanUtilsBean这个类,然后重载copyProperties方法,用法new BeanCopyUtil(). copyProperties()
最后一个参数,如果是true,忽略;false,不忽略
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class BeanCopyUtil extends BeanUtilsBean{
private static final Logger log=LoggerFactory.getLogger(BeanCopyUtil.class);
/**
*
* @param dest 目标对象
* @param orig 源对象
* @param ignoreNullFlag 是否忽略null值
* @throws IllegalAccessException
* @throws InvocationTargetException
*/
public void copyProperties(Object dest, Object orig,boolean ignoreNullFlag)
throws IllegalAccessException, InvocationTargetException {
// Validate existence of the specified beans
if (dest == null) {
throw new IllegalArgumentException
("No destination bean specified");
}
if (orig == null) {
throw new IllegalArgumentException("No origin bean specified");
}
if (log.isDebugEnabled()) {
log.debug("BeanUtils.copyProperties(" + dest + ", " +
orig + "," + ignoreNullFlag + ")");
}
// Copy the properties, converting as necessary
if (orig instanceof DynaBean) {
DynaProperty[] origDescriptors =
((DynaBean) orig).getDynaClass().getDynaProperties();
for (int i = 0; i < origDescriptors.length; i++) {
String name = origDescriptors[i].getName();
// Need to check isReadable() for WrapDynaBean
// (see Jira issue# BEANUTILS-61)
if (getPropertyUtils().isReadable(orig, name) &&
getPropertyUtils().isWriteable(dest, name)) {
Object value = ((DynaBean) orig).get(name);
if(ignoreNullFlag){
if(value!=null){
copyProperty(dest, name, value);
}
}else{
copyProperty(dest, name, value);
}
}
}
} else if (orig instanceof Map) {
@SuppressWarnings("unchecked")
// Map properties are always of type
Map propMap = (Map) orig;
for (Map.Entry entry : propMap.entrySet()) {
String name = entry.getKey();
Object value=entry.getValue();
if (getPropertyUtils().isWriteable(dest, name)) {
if(ignoreNullFlag){
if(value!=null){
copyProperty(dest, name, value);
}
}else{
copyProperty(dest, name, value);
}
}
}
} else /* if (orig is a standard JavaBean) */ {
PropertyDescriptor[] origDescriptors =
getPropertyUtils().getPropertyDescriptors(orig);
for (int i = 0; i < origDescriptors.length; i++) {
String name = origDescriptors[i].getName();
if ("class".equals(name)) {
continue; // No point in trying to set an object's class
}
if (getPropertyUtils().isReadable(orig, name) &&
getPropertyUtils().isWriteable(dest, name)) {
try {
Object value =
getPropertyUtils().getSimpleProperty(orig, name);
if(ignoreNullFlag){
if(value!=null){
copyProperty(dest, name, value);
}
}else{
copyProperty(dest, name, value);
}
} catch (NoSuchMethodException e) {
// Should not happen
}
}
}
}
}
}