excel导出中poi支持中文的方法

/**
	 *  把字符串转成utf8编码，保证中文文件名不会乱码
	 * @param s
	 * @return
	 */
	public static String toUtf8String(String s){
		StringBuffer sb = new StringBuffer();
		for (int i=0;i<s.length();i++){
			char c = s.charAt(i);
			if (c >= 0 && c <= 255){sb.append(c);}
			else{
				byte[] b;
				try { b = Character.toString(c).getBytes("utf-8");}
				catch (Exception ex) {
					System.out.println(ex);
					b = new byte[0];
				}
				for (int j = 0; j < b.length; j++) {
					int k = b[j];
					if (k < 0) k += 256;
					sb.append("%" + Integer.toHexString(k).toUpperCase());
				}
			}
		}
		return sb.toString();
	}