java中添加流水单号

 1 //用于生成出库的ID
 2       public static String getexportid(){
 3     //生成规则：Ck+时间戳(20170626143520)+6位的随机数
 4           return "CK"+getnowstr()+getStringRandom(6);
 5       }
 6       public static String getstorageid(){
 7             //生成规则：Rk+时间戳(20170626143520)+6位的随机数
 8                   return "RK"+getnowstr()+getStringRandom(8);
 9               }
10
11       private static String getnowstr(){
12           Date date = new Date();
13           SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
14           String str = sdf.format(date);
15           return str;
16       }
17       //随机生成六位数
18       private static String getStringRandom(int length) {
19
20           String val = "";
21           Random random = new Random();
22
23           //参数length，表示生成几位随机数
24           for(int i = 0; i < length; i++) {
25
26               String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
27               //输出字母还是数字
28               if( "char".equalsIgnoreCase(charOrNum) ) {
29                   //输出是大写字母还是小写字母
30                   int temp = random.nextInt(2) % 2 == 0 ? 65 : 97;
31                   val += (char)(random.nextInt(26) + temp);
32               } else if( "num".equalsIgnoreCase(charOrNum) ) {
33                   val += String.valueOf(random.nextInt(10));
34               }
35           }
36           return val;
37       }