// 重命名文件
@SuppressWarnings("static-access")
private String renameFile() {
String t = new Timestamp(new Date().getTime()).toString();
t = t.replaceAll("-", "");
t = t.replaceAll(":", "");
t = t.replace(".", "");
t = t.replaceAll(" ", "");
Random rd = new Random();
int rdNum = rd.nextInt(Integer.MAX_VALUE);
return (t + rdNum);
}