采用重写Collections.sort方法实现对 List中的HashMap排序。

ArrayList<Map<String,Object>> list = new ArrayList<Map<String, Object>>();
Map<String, Object> map1 = new HashMap<String, Object>();
Map<String, Object> map2 = new HashMap<String, Object>();
Map<String, Object> map3 = new HashMap<String, Object>();
map1.put("str","aaa");
map2.put("str","bbb");
map3.put("str","ccc");
list.add(map1);
list.add(map2);
list.add(map3);
Collections.sort(list, new Comparator<HashMap<String,Object>>(){
				@Override
				public int compare(
					HashMap<String, Object> o1,
					HashMap<String, Object> o2) {
					String name1 = (String) o1.get("str");
					String name2 = (String) o2.get("str");
					return String.valueOf(name1).compareTo(name2);
					/* 如果需要比较的为int类型数据，用以下方法*/
					//String name1 = (Integer) o1.get("str");
					//String name2 = (Integer) o2.get("str");
					//return name1 - name2;
				}
	});