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org.beetl.sql.ext.UUIDAutoGen22 Maven / Gradle / Ivy
package org.beetl.sql.ext;
import org.beetl.sql.core.IDAutoGen;
import java.util.UUID;
/**
* uuid,基于版本uuid 版本3,但从36位压缩压到22位，如 b4YELwjlM7KN9Xd7WbxXV
* {code
* @AssingId("uuid22")
* String id;
* }
*
* 第三方类库提供了uuid time版本，比如
*
*
* com.fasterxml.uuid
* java-uuid-generator
* 4.0.1
*
*
*
*
* NoArgGenerator timeBasedGenerator = Generators.timeBasedGenerator();
* String timeUUID = timeBasedGenerator.generate());
*
*
* 你可以自定义一个基于时间的uuid 生成器
*
* 必须调用{@link org.beetl.sql.core.SQLManager#addIdAutoGen} 来使用
* @see org.beetl.sql.annotation.entity.AssignID
* @author xiandafu
*/
public class UUIDAutoGen22 implements IDAutoGen {
@Override
public String nextID(String params) {
String compressedUUID = RadixUtil.randomUUID();
return compressedUUID;
}
public static void main(String[] args){
System.out.println(new UUIDAutoGen22().nextID(""));
}
}
class RadixUtil {
final static char[] DIGIT = {
'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', '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'
};
final static int RADIX = DIGIT.length;
/**
* 将长整型数值转换为指定的进制数（最大支持62进制）
*/
public static String to62String(long i) {
StringBuilder sb = new StringBuilder(32);
while (i >= RADIX) {
sb.append(DIGIT[(int) (i % RADIX)]);
i = i / RADIX;
}
sb.append(DIGIT[(int) (i)]);
return sb.reverse().toString();
}
public static String randomUUID(){
UUID uuid = UUID.randomUUID();
long most = Math.abs(uuid.getMostSignificantBits());
long least = Math.abs(uuid.getLeastSignificantBits());
StringBuilder sb24 = new StringBuilder();
sb24.append(to62String(most)).append(to62String(least));
return sb24.toString();
}
}
