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;
    }
}