java uuid 长度处理

直接上代码

package test.uid;import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;/*** @description: <br/>* @package test.AA.java* @author YangPu* @date 2016年11月3日 下午3:38:34*/
public class AA {private static final String fileName = "E:/notepad++_file/out.txt";private static final String[] chars = { // <br>"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", // <br>"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", // <br>"k", "l", "m", "n", "o", "p", "q", "r", "s", "t", // <br>"u", "v", "w", "x", "y", "z", "A", "B", "C", "D", // <br>"E", "F", "G", "H", "I", "J", "K", "L", "M", "N", // <br>"O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", // <br>"Y", "Z", "a1", "a2" // <br>};// 统计UUID的长度变化范围public static void main(String[] args) throws InterruptedException {int time = 1 * 10000 * 1;for (int j = 0; j < 15; j++) {Map<Integer, Integer> sum = new HashMap<>();Map<String, Integer> sumStr = new HashMap<>();for (int ii = 0; ii < time; ii++) {String uuid = uuid(j);int sbLength = uuid.length();String sb = uuid.substring(0, 1);if (sum.get(Integer.valueOf(sbLength)) != null) {int v = sum.get(Integer.valueOf(sbLength)).intValue();v++;sum.put(Integer.valueOf(sbLength), v);} else {sum.put(Integer.valueOf(sbLength), 1);}if (sumStr.get(sb) != null) {int v = sumStr.get(sb).intValue();v++;sumStr.put(sb, v);} else {sumStr.put(sb, 1);}}write("j：" + j);for (Integer in : sum.keySet()) {write(in + "：" + sum.get(in));// System.out.println(in + "：" + sum.get(in));}}}/*** @description: 生成UUID<br/>*               可以确定开头字母来区别业务<br/>*               num16：必须是0--15以内的数字<br/>*              @param：num16：<br/>*               00-->>"0", "1", "2", "3",<br/>*               01-->>"4", "5", "6", "7",<br/>*               02-->>"8", "9", "a", "b",<br/>*               03-->>"c", "d", "e", "f",<br/>*               04-->>"g", "h", "i", "j",<br/>*               05-->>"k", "l", "m", "n",<br/>*               06-->>"o", "p", "q", "r",<br/>*               07-->>"s", "t", "u", "v",<br/>*               08-->>"w", "x", "y", "z",<br/>*               09-->>"A", "B", "C", "D",<br/>*               10-->>"E", "F", "G", "H",<br/>*               11-->>"I", "J", "K", "L",<br/>*               12-->>"M", "N", "O", "P",<br/>*               13-->>"Q", "R", "S", "T",<br/>*               14-->>"U", "V", "W", "X",<br/>*/public static String uuid(int num16) {if (num16 < 0 || num16 > 15) {num16 = 0;}StringBuilder sb = new StringBuilder();String pre = Integer.toHexString(num16);String uid = pre + UUID.randomUUID().toString().replaceAll("-", "");int length = uid.length();// 将16进制数转换成64进制数// 2的4次方转化成2的6次方的数据// bcb da5 f41 172 4bc 28b 920 b1c 5f4 422 6e// 3位转2位int i = 0;for (; i < length; i = i + 3) {// 16进制数转化成10进制数int end = i + 3;if (end >= length) {end = length;}int t = Integer.parseInt(uid.substring(i, end), 16);// 10进制数转化成64进制数sb.append(chars[t / 64]);// 第一个数据sb.append(chars[t % 64]);// 第二个数据}// write(sb.toString().substring(0, 1) + "----" + sb.toString());write(sb);// System.out.println(sb);return sb.toString();}public static void write(Object out) {if (out == null) {return;}try {// 打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件FileWriter writer = new FileWriter(fileName, true);writer.write(out.toString() + "\n");writer.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

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