package cn.ksource.core.util;
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import java.security.MessageDigest;
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import java.util.UUID;
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/**
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* Created by chenlong
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* Date:2017/7/30
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* time:11:10
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*/
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public class GenerateUtil {
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public static String generateUUID() {
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return UUID.randomUUID().toString().replaceAll("-", "");
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}
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public static String generate16Id() {
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String uuid = generateUUID();
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String nextId = null;
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char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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md.update(uuid.getBytes());
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byte tmp[] = md.digest();
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char str[] = new char[16];
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int k = 0;
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for (int i = 0; i < 16; i++) {
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byte byte0 = tmp[i];
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//只取高位
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str[k++] = hexDigits[(byte0 >>> 4 & 0xf) % 10];
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// str[k++] = hexDigits[byte0 & 0xf];
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}
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nextId = new String(str); // 换后的结果转换为字符串
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} catch (Exception e) {
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e.printStackTrace();
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}
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return nextId;
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}
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public static void main(String[] args) {
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for (int i = 0; i < 200; i++) {
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System.out.println(generate16Id());
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}
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}
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}
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