url encode base64 uuid

生成url格式base64编码的uuid

import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.UUID;
public class Base64UUIDHelper {
    public Base64UUIDHelper() {
    }
    public static String getBase64Uuid() {
        UUID temp = UUID.randomUUID();
        byte[] bytes = new byte[16];
        long half = temp.getLeastSignificantBits();
        int i;
        for(i = 0; i < 8; ++i) {
            bytes[i] = (byte)((int)(half & 255L));
            half >>= 8;
        }
        half = temp.getMostSignificantBits();
        for(i = 8; i < 16; ++i) {
            bytes[i] = (byte)((int)(half & 255L));
            half >>= 8;
        }
        return (new String(Base64.getUrlEncoder().encode(bytes), StandardCharsets.UTF_8)).substring(0, 22);
    }
}