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();
    }


}