Java 日期与数字转换

 package com.test;
 import org.apache.commons.lang.StringUtils;
 import org.junit.Test;
 import java.text.SimpleDateFormat;
 import java.util.Date;

 /**
  * @author ceshi
  * @Title: SimpleDate
  * @Package test
  * @Description: SimpleDate
  * @date 2018/5/3016:32
  */
 public class JunitSimpleDate {

     public static String DATE_YYYY_MM_DD = "yyyy-MM-dd";

     public static String DATE_Y_M_DDHHMMSS = "yyyy-MM-dd HH:mm:ss";

     @Test
     public void test() {
         System.out.println(convert2long("2018-05-30",DATE_YYYY_MM_DD));
         System.out.println(convert2String(curTimeMillis(),DATE_Y_M_DDHHMMSS));
     }

     /**
      * 将日期格式的字符串转换为长整型
      * @param date
      * @param format
      * @return
      */
     public static long convert2long(String date, String format) {
         try {
             if (StringUtils.isNotBlank(date)&&StringUtils.isNotBlank(format)) {
                 SimpleDateFormat sf = new SimpleDateFormat(format);
                 return sf.parse(date).getTime();
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         return 0l;
     }

     /**
      * 将长整型数字转换为日期格式的字符串
      * @param time
      * @param format
      * @return
      */
     public static String convert2String(long time, String format) {
         if (time > 0l&&StringUtils.isNotBlank(format)) {
             SimpleDateFormat sf = new SimpleDateFormat(format);
             Date date = new Date(time);
             return sf.format(date);
         }
         return "";
     }

     /**
      * 获取当前系统的日期
      * @return
      */
     public static long curTimeMillis() {
         return System.currentTimeMillis();
     }

 }