java 实现生成excel表头

	public String getKey(int index){
		String colCode = "";
		char key='A';
		int loop = index / 26;
		if(loop>0){
			colCode += getKey(loop-1);
		}
		key = (char) (key+index%26);
		colCode += key;
		return colCode;
	}

原文 地址 http://blog.youkuaiyun.com/zwhfyy/article/details/45562589