list<map<String ,object>> 去重，list map去重

package com.cmos.ngcscontrol.service;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

public class HandPasswordsHelper

{

/**

* @param args

*/

public static void main(String[] args)

{

Map<String, Map> msp = new HashMap<String, Map>();

List<Map<String, Object>> listMap = new ArrayList<Map<String,Object>>();

//上面两句是在你的基础上加的

List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();

Map<String,Object> map1=new HashMap<String,Object>();

map1.put("orgaId",1);

map1.put("name","nihao");

map1.put("age",23);

Map<String,Object> map2=new HashMap<String,Object>();

map2.put("orgaId",1);

map2.put("name","wohao");

map2.put("age",32);

Map<String,Object> map3=new HashMap<String,Object>();

map3.put("orgaId",2);

map3.put("name","dajiahao");

map3.put("age",35);

Map<String,Object> map4=new HashMap<String,Object>();

map4.put("orgaId",2);

map4.put("name","dajiahao");

map4.put("age",35);

Map<String,Object> map5=new HashMap<String,Object>();

map5.put("orgaId",3);

map5.put("name","dajiahao");

map5.put("age",35);

Map<String,Object> map6=new HashMap<String,Object>();

map6.put("orgaId",3);

map6.put("name","dajiahao");

map6.put("age",35);

list.add(map1);

list.add(map2);

list.add(map3);

list.add(map4);

list.add(map5);

list.add(map6);

//以下内容就是在list中如何去除orgaId相同的map

System.out.println("初始化数据（原数据）：" + list.toString());

//把list中的数据转换成msp,去掉同一orgaId值多余数据，保留查找到第一个orgaId值对应的数据

for(int i = list.size()-1 ; i>=0; i--){

Map map = list.get(i);

String orgaId = map.get("orgaId").toString();

map.remove("orgaId");

msp.put(orgaId, map);

}

//把msp再转换成list,就会得到根据某一字段去掉重复的数据的List<Map>

Set<String> mspKey = msp.keySet();

for(String key: mspKey){

Map newMap = msp.get(key);

newMap.put("orgaId", key);

listMap.add(newMap);

}

System.out.println("去掉重复数据后的数据：" + listMap.toString());

for (int i = 0; i < listMap.size(); i++)

{

System.out.println("orgaId:"+listMap.get(i).get("orgaId")+"===>name:"+listMap.get(i).get("name")+"===>age:"+listMap.get(i).get("age"));

}

}

}