按bean的属性值对list集合进行排序

List根据对象的某个属性排序工具类 List排序

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.ComparatorUtils;
import org.apache.commons.collections.comparators.ComparableComparator;

public class ListSortUtil {

/**
* 按bean的属性值对list集合进行排序
*
* @param list
*            要排序的集合
* @param propertyName
*            集合元素的属性名
* @param isAsc
*            排序方向,true--正向排序,false--逆向排序
* @return 排序后的集合
*/
public static List sortList(List list, String propertyName, boolean isAsc) {
//借助commons-collections包的ComparatorUtils
//BeanComparator，ComparableComparator和ComparatorChain都是实现了Comparator这个接口
if(list!=null && list.size()>0){
Comparator mycmp = ComparableComparator.getInstance();
mycmp = ComparatorUtils.nullLowComparator(mycmp);  //允许null
if(isAsc){
mycmp = ComparatorUtils.reversedComparator(mycmp); //逆序
}
Comparator cmp = new BeanComparator(propertyName, mycmp);
Collections.sort(list, cmp);
}
return list;
}
}