package com.example.server.utils;
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/**
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* User
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* Date 2016/11/2.
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*/
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import java.util.Date;
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import java.util.Random;
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import java.util.UUID;
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public class UUIDUtil {
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public UUIDUtil() {
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}
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/**
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* 获得一个UUID
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*
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* @return String UUID
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*/
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public static String getUUID() {
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String s = UUID.randomUUID().toString();
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// 去掉“-”符号
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return s.substring(0, 8) + s.substring(9, 13) + s.substring(14, 18)
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+ s.substring(19, 23) + s.substring(24);
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}
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public static String[] chars = new String[]{"a", "b", "c", "d", "e", "f",
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"g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
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"t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5",
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"6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
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"J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
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"W", "X", "Y", "Z"};
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public static String generateShortUuid() {
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StringBuffer shortBuffer = new StringBuffer();
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String uuid = UUID.randomUUID().toString().replace("-", "");
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for (int i = 0; i < 8; i++) {
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String str = uuid.substring(i * 4, i * 4 + 4);
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int x = Integer.parseInt(str, 16);
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shortBuffer.append(chars[x % 0x3E]);
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}
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return shortBuffer.toString();
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}
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public static String generateCode() {
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java.text.SimpleDateFormat sfdate = new java.text.SimpleDateFormat("yyyyMMddHHmmssSSSS");
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String code = sfdate.format(new Date());
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float fl = new Random().nextFloat();
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fl = fl < 0.1 ? (float) (fl + 0.1) : fl;
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Integer ran = Integer.parseInt((fl * 1000000 + "").split("\\.")[0]);
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char[] temp = code.substring(code.length() - 6, code.length()).toCharArray();
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for (char c : temp) {
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int i = new Random().nextInt(6);
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ran += Integer.parseInt(((Integer.parseInt(c + "") * Math.pow(10, i)) + "").split("\\.")[0]);
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}
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code = code.substring(0, code.length() - 6) + ran;
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String buwei = "";
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int codel = code.length();
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if (codel < 24) {
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double f = Math.pow(10, 24 - codel);
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fl = new Random().nextFloat();
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fl = fl < 0.1 ? (float) (fl + 0.1) : fl;
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String a1 = fl * f + "";
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buwei = a1.split("\\.")[0];
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}
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return code + buwei;
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}
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public static String createVerifyCode() {
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String result = null;
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try {
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Random rad = new Random();
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result = rad.nextInt(1000000) + "";
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if (result.length() != 6) {
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return createVerifyCode();
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}
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} catch (Exception e) {
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System.err.println("create verify code error：：" + e);
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}
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return result;
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}
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public static Long generateId() {
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String code = String.valueOf(new Date().getTime());
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float fl = new Random().nextFloat();
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fl = fl < 0.1 ? (float) (fl + 0.1) : fl;
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Integer ran = Integer.parseInt((fl * 1000000 + "").split("\\.")[0]);
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char[] temp = code.substring(code.length() - 6, code.length()).toCharArray();
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for (char c : temp) {
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int i = new Random().nextInt(6);
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ran += Integer.parseInt(((Integer.parseInt(c + "") * Math.pow(10, i)) + "").split("\\.")[0]);
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}
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code = code.substring(0, code.length() - 6) + ran;
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String buwei = "";
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int codel = code.length();
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if (codel < 17) {
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double f = Math.pow(10, 17 - codel);
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fl = new Random().nextFloat();
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fl = fl < 0.1 ? (float) (fl + 0.1) : fl;
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String a1 = fl * f + "";
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buwei = a1.split("\\.")[0];
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}
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Random runnable = new Random();
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int num = runnable.nextInt(90) + 10;
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return Long.parseLong(code + buwei + num);
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}
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/**
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* 获得指定数目的UUID
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*
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* @param number int 需要获得的UUID数量
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* @return String[] UUID数组
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*/
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public static String[] getUUID(int number) {
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if (number < 1) {
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return null;
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}
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String[] ss = new String[number];
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for (int i = 0; i < number; i++) {
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ss[i] = getUUID();
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}
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return ss;
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}
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public static String getOrderCode() {
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java.text.SimpleDateFormat sfdate = new java.text.SimpleDateFormat("yyyyMMddHHmmssSSSS");
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String code = sfdate.format(new Date()) + (int) (Math.random() * 9000 + 1000);
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return code;
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}
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}
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