java poi導出中文命名問題

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();
}

而後在導出時，對文件名引用該函數，代碼以下：

this.getResponse().setHeader("Content-Disposition", "inline;filename=" +toUtf8String("中文文件名.xls"));