1 import java.text.DateFormat;
2 import java.text.SimpleDateFormat;
3 import java.util.Date;
4
5 public class OrderNo{
6 private static int sn = 0;
7
8 public static String NextOrderNo(){
9 if(sn == 999999999)
10 sn = 0;
11 else
12 sn++;
13 DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
14 return df.format(new Date()) + padRight(String.valueOf(sn),9, '0');
15 }
16 public static String padLeft(String src, int len, char ch) {
17 int diff = len - src.length();
18 if (diff <= 0) {
19 return src;
20 }
21
22 char[] charr = new char[len];
23 System.arraycopy(src.toCharArray(), 0, charr, 0, src.length());
24 for (int i = src.length(); i < len; i++) {
25 charr[i] = ch;
26 }
27 return new String(charr);
28 }
29 public static String padRight(String src, int len, char ch) {
30 int diff = len - src.length();
31 if (diff <= 0) {
32 return src;
33 }
34
35 char[] charr = new char[len];
36 System.arraycopy(src.toCharArray(), 0, charr, diff, src.length());
37 for (int i = 0; i < diff; i++) {
38 charr[i] = ch;
39 }
40 return new String(charr);
41 }
42 // 防止创建类的实例
43 private OrderNo(){}
44
45 public static void main(String[] args) {
46 Thread t1 = new Thread(){
47 @Override
48 public void run() {
49 for (int i = 0; i < 5000; i++) {
50 try {
51 sleep(300);
52 System.out.println(OrderNo.NextOrderNo());
53 } catch (InterruptedException e) {
54 e.printStackTrace();
55 }
56 }
57 }
58 };
59 Thread t2 = new Thread(){
60 @Override
61 public void run() {
62 for (int i = 0; i < 5000; i++) {
63 try {
64 sleep(200);
65 System.out.println(OrderNo.NextOrderNo());
66 } catch (InterruptedException e) {
67 e.printStackTrace();
68 }
69 }
70 }
71 };
72 Thread t3 = new Thread(){
73 @Override
74 public void run() {
75 for (int i = 0; i < 5000; i++) {
76 try {
77 sleep(50);
78 System.out.println(OrderNo.NextOrderNo());
79 } catch (InterruptedException e) {
80 e.printStackTrace();
81 }
82 }
83 }
84 };
85 t1.run();
86 t2.run();
87 t3.run();
88 }
89 }
90
