1. /**
    2.  * 生成id
    3.  * @author ml
    4.  * @param <ID> id
    5.  */
    6. public interface IdGenerator<ID extends Serializable> {
    7.    /**
    8.     * 获取id
    9.     * @return ID 返回19位id
    10.     */
    11.    ID generator();
    12. }
    1. /**
    2.  * 生成19位分布式id
    3.  *
    4.  * @author ml
    5.  * 当前id地址随机数 + 当前时间戳随机数+  启动时间戳随机数 + 启动随机数 + 请求次数
    6.  */
    7. @Component("idGenerator")
    8. public class LongIdGenerator implements IdGenerator<Long> {
    9.     private static int counter = 0;
    10.     private static final int IP_RANDOM_INT;
    11.     private static final int JVM_RANDOM_INT;
    12.     private static final int LAST_RANDOM_INT;
    14.     static {
    15.         long timeMillis = System.currentTimeMillis();
    16.         int ip;
    17.         try {
    18.             ip = toInt(InetAddress.getLocalHost().getAddress());
    19.         } catch (Exception e) {
    20.             ip = 0;
    21.         }
    22.         Random ipRandom = new Random(ip);
    23.         Random jvmRandom = new Random(timeMillis);
    24.         Random lastRandom = new Random();
    25.         IP_RANDOM_INT = ipRandom.nextInt(800) + 100;
    26.         JVM_RANDOM_INT = jvmRandom.nextInt(90) + 10;
    27.         LAST_RANDOM_INT = lastRandom.nextInt(10000);
    28.     }
    30.     @Override
    31.     public Long generator() {
    32.         //1970年1月1日0点 到现在的秒数
    33.         long millisecond = System.currentTimeMillis();
    34.         int count = LAST_RANDOM_INT + this.getCount();
    35.         return (long) IP_RANDOM_INT * 10000000000000000L + millisecond * 100000L + (JVM_RANDOM_INT * 10000L) + (long) count;
    36.     }
    38.     protected int getCount() {
    39.         synchronized (LongIdGenerator.class) {
    40.             if (counter < 0) {
    41.                 counter = 0;
    42.             }
    43.             return counter++;
    44.         }
    45.     }
    47.     private static int toInt(byte[] bytes) {
    48.         int result = 0;
    49.         for (int i = 0; i < 4; ++i) {
    50.             result = (result << 8) - -128 + bytes[i];
    51.         }
    52.         return result;
    53.     }
    55. }

    测试代码：

    1. @Autowired
    2.     private IdGenerator<Long> generator;
    4.     @RequestMapping("/findId")
    5.     public Long findId(){
    6.         return generator.generator();
    7.     }

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