   /**
   * 根據(jù)map中的某個key 去除List中重復(fù)的map
   * @author shijing
   * @param list
   * @param mapKey
   * @return
   */
  public static List<Map<String, Object>> removeRepeatMapByKey(List<Map<String, Object>> 
      list, String mapKey){
    if (CollectionUtils.isNullOrEmpty(list)) return null;
     //把list中的數(shù)據(jù)轉(zhuǎn)換成msp,去掉同一id值多余數(shù)據(jù)，保留查找到第一個id值對應(yīng)的數(shù)據(jù)
    List<Map<String, Object>> listMap = new ArrayList<>();
    Map<String, Map> msp = new HashMap<>();
    for(int i = list.size()-1 ; i>=0; i--){
      Map map = list.get(i);
      String id = (String)map.get(mapKey);
      map.remove(mapKey);
      msp.put(id, map);
    }
    //把msp再轉(zhuǎn)換成list,就會得到根據(jù)某一字段去掉重復(fù)的數(shù)據(jù)的List<Map>
    Set<String> mspKey = msp.keySet();
    for(String key: mspKey){
      Map newMap = msp.get(key);
      newMap.put(mapKey, key);
      listMap.add(newMap);
    }
    return listMap;
  }

測試：

public static void main(String[] args) {
    Map<String, Map> msp = new HashMap<String, Map>();
    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
    List<Map<String, Object>> listMap = new ArrayList<Map<String,Object>>();
    Map<String, Object> map1 = new HashMap<String, Object>();
    map1.put("id", "1123");
    map1.put("name", "張三");
    Map<String, Object> map2 = new HashMap<String, Object>();
    map2.put("id", "2");
    map2.put("name", "李四");
    Map<String, Object> map3 = new HashMap<String, Object>();
    map3.put("id", "1123");
    map3.put("name", "王五");
    Map<String, Object> map4 = new HashMap<String, Object>();
    map4.put("id", "3");
    map4.put("name", "趙六");
    list.add(map1);
    list.add(map2);
    list.add(map3);
    list.add(map4);
    System.out.println("初始數(shù)據(jù)：" + list.toString());
    System.out.println("去重之后：" + removeRepeatMapByKey(list,"id"));
  }

結(jié)果：