java-map按key升序排序

/**
	 * 使用 Map按key进行排序
	 * @param map
	 * @return
	 */
	public static Map<Object, Object> sortMapByKey(Map<Object, Object> map) {
		if (map == null || map.isEmpty()) {
			return null;
		}
		Map<Object, Object> sortMap = new TreeMap<Object, Object>(new Comparator<String>(){
					public int compare(String str1,String str2){
						return str1.compareTo(str2)//将str1和str2调换位置是倒序排序
					}
				});
		sortMap.putAll(map);
		return sortMap;
	}

例如~：
Map priceMap=new TreeMap();
priceMap.put("","");
priceMap.put("","");
priceMap.put("","");
priceMap.put("","");
priceMap.put("","");

Map<String, String> valueMap = sortMapByKey(priceMap);    //按Key进行排序

ok 搞定~