文件重命名和获取用户关键代码

package com.tszr.eBusiness.util;

import com.tszr.eBusiness.entity.BUser;

import javax.servlet.http.HttpSession;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MyUtil {
    /**
     * 将实际的文件名重命名
     */
    public static String getNewFileName(String oldFileName) {
        int lastIndex = oldFileName.lastIndexOf(".");
        String fileType = oldFileName.substring(lastIndex);
        Date now = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("YYYYMMDDHHmmssSSS");
        String time = sdf.format(now);
        String newFileName = time + fileType;
        return newFileName;
    }
    /**
     * 获得用户信息
     */
    public static BUser getUser(HttpSession session) {
        BUser bUser = (BUser)session.getAttribute("bUser");
        return bUser;
    }
}