利用apache commons对List元素的多个属性进行排序

package com;

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

import org.apache.commons.beanutils.BeanComparator;

import com.CfgModel;

public class ListSorter {

		    /**
		     * List 元素的多个属性进行排序。例如 ListSorter.sort(list, 

		"orderIndex", "treeLevel")，则先按
		     * orderIndex 属性排序，orderIndex 相同的元素按 treeLevel 属性排序。
		     *
		     * @param list       包含要排序元素的 List
		     * @param properties 要排序的属性。前面的值优先级高。
		     */
		    public static <V> void sort(List<V> list, final String... properties) {
		        Collections.sort(list, new Comparator<V>() {
		            public int compare(V o1, V o2) {
		                if (o1 == null && o2 == null) return 0;
		                if (o1 == null) return -1;
		                if (o2 == null) return 1;

		                for (String property : properties) {
		                    Comparator c = new BeanComparator(property);
		                    int result = c.compare(o1, o2);
		                    if (result != 0) {
		                        return result;
		                    }
		                }
		                return 0;
		            }
		        });
		    }
		    
		    public static void main(String[] args){
		    	List<CfgModel> list = new ArrayList<CfgModel>();
		    	CfgModel cfgModel1 = new CfgModel(); 
		    	cfgModel1.setModelName("l1");
		    	cfgModel1.setOrderIndex(1);
		    	cfgModel1.setTreeLevel(1);
		    	list.add(cfgModel1);
		    	
		    	CfgModel cfgModel2 = new CfgModel(); 
		    	cfgModel2.setModelName("l12");
		    	cfgModel2.setOrderIndex(2);
		    	cfgModel2.setTreeLevel(1);
		    	list.add(cfgModel2);
		    	
		    	CfgModel cfgModel3 = new CfgModel(); 
		    	cfgModel3.setModelName("l2");
		    	cfgModel3.setOrderIndex(1);
		    	cfgModel3.setTreeLevel(2);
		    	list.add(cfgModel3);
		    	
		    	CfgModel cfgModel4 = new CfgModel(); 
		    	cfgModel4.setModelName("l21");
		    	cfgModel4.setOrderIndex(2);
		    	cfgModel4.setTreeLevel(2);
		    	list.add(cfgModel4);
		    	
		    	sort(list, "orderIndex","treeLevel");
		    	for (CfgModel c:list){
		    		System.out.println(c.getModelName()+","+c.getOrderIndex()+","+c.getTreeLevel());
		    	}
		    }
}

 

结果：

l1,1,1

l2,1,2

l12,2,1

l21,2,2

 

先按orderIndex排序然后按treeLevel排序