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importjava.util.Collections;importjava.util.Comparator;importjava.util.List;importorg.apache.commons.beanutils.BeanComparator;importorg.apache.commons.collections.ComparatorUtils;importorg.apache.commons.collections.comparators.ComparableComparator;public classListSortUtil {/*** 按bean的属性值对list集合进行排序 

    * 

    *@paramlist 

    *            要排序的集合 

    *@parampropertyName 

    *            集合元素的属性名 

    *@paramisAsc 

    *            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, booleanisAsc) {//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= newBeanComparator(propertyName, mycmp);    

                Collections.sort(list, cmp);   

            }returnlist; 

    } 

}