Java中对象按照属性排序
项目中经常需要用到比如地区列表按照中文的拼音首字母排序，但是有时候获取到的地区列表是对象的形式，有地区id，地区名称两个属性。这里主要涉及到两个技术点：
1、对象按属性排序；2、中文按拼音首字母排序。下面给出自己整理好的demo：
import java.text.Collator;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import org.apache.commons.beanutils.BeanComparator;import org.apache.commons.collections.ComparatorUtils;import org.apache.commons.collections.comparators.ComparableComparator;import org.apache.commons.collections.comparators.ComparatorChain;public class CompareTipA { private int id; private String name; private String age; @SuppressWarnings("unchecked")public static void main(String []args) { ArrayList<Object> list = new ArrayList<Object>(); list.add(new CompareTipA(1,"3","五")); list.add(new CompareTipA(2,"1","六")); list.add(new CompareTipA(5,"5","二")); list.add(new CompareTipA(3,"4","四")); list.add(new CompareTipA(8,"4","四")); list.add(new CompareTipA(4,"2","一")); Comparator mycmp = ComparableComparator.getInstance(); mycmp = ComparatorUtils.nullLowComparator(mycmp); //允许null mycmp = ComparatorUtils.reversedComparator(mycmp); //逆序 ArrayList<Object> sortFields = new ArrayList<Object>();Comparator<Object> comparator=Collator.getInstance(java.util.Locale.CHINA); sortFields.add(new BeanComparator("name",comparator)); //name正序 (主) sortFields.add(new BeanComparator("id", mycmp)); //id逆序 (副) ComparatorChain multiSort = new ComparatorChain(sortFields); Collections.sort(list,multiSort); for (int i =0;i<list.size();i++) { System.out.println(list.get(i)); //输出/* [id=5,name=二,age=5][id=2,name=六,age=1][id=8,name=四,age=4][id=3,name=四,age=4][id=1,name=五,age=3][id=4,name=一,age=2]*/ } } public CompareTipA(int id, String age,String name) { this.id = id; this.name = name; this.age = age; } public int getId() { return this.id; } public void setId(int id) { this.id = id; } public String getName() { return this.name; } public void setName(String name) { this.name = name; }// public int compareTo(Object o) {// return this.comparator.compare(this, o);// } public String toString() { return "[id=" + this.id + ",name=" + this.name +",age=" + this.age +"]"; } public String getAge() { return age; } public void setAge(String age) { this.age = age; }} 注意：需要导入的三个包：commons-beanutils-1.8.3.jar commons-collections-3.2.1.jar commons-logging-1.1.3.jarcommons-collections包不能用官网上的4.0版本，因为从源码中可以看见commons-beanutils包调用的就是commons-collections3.2版本的api，4.0的没兼容；commons-logging包也是commons-beanutils包所需要的。
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