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# Java生成uuid
“`java
import java.util.UUID;
/**
* @ClassName: UuidUtil
* @Description: TODO
* @author: wxvirus
* @Date: 2020/7/2 12:46
*/
public class UuidUtil {
public static String[] chars = new String[]{“a”, “b”, “c”,
“d”, “e”, “f”, “g”, “h”, “i”, “j”, “k”, “l”, “m”, “n”, “o”, “p”, “q”,
“r”, “s”, “t”, “u”, “v”, “w”, “x”, “y”, “z”, “0”, “1”, “2”, “3”, “4”, “5”,
“6”, “7”, “8”, “9”, “A”, “B”, “C”, “D”, “E”, “F”, “G”, “H”, “I”, “J”, “K”,
“L”, “M”, “N”, “O”, “P”, “Q”, “R”, “S”, “T”, “U”, “V”, “W”, “X”, “Y”, “Z”};
/**
* 获取短UUID
* 短ID是根据将32位ID，转为62进制8位ID，减少存储空间
* 原理是将uuid转为10进制，再对62取余
* 也可以在添加两个符号，转成64进制
* @return String
*/
public static String getShortUuid() {
StringBuilder shortBuffer = new StringBuilder();
String uuid = UuidUtil.getUuid();
for (int i = 0; i < 8; i ) {
String str = uuid.substring(i * 4, i * 4 4);
int x = Integer.parseInt(str, 16);
// 对62取余
shortBuffer.append(chars[x % 0x3F]);
}
return shortBuffer.toString();
}
/**
* 获得32位UUID
* @return String
*/
public static String getUuid() {
String uuid = UUID.randomUUID().toString();
// 去掉 – 符号
return uuid.replaceAll(“-“, “”);
}
public static void main(String[] args) {
System.out.println(getShortUuid());
}
}
“`
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