是想生成GUID吗？
SQL> select sys_guid() from dual
;

SYS_GUID()
--------------------------------
F18031C69D8345DEB305D4B2E796A282

-------------------------------------------------java取得uuid

package com.hdsoft.uuid;

import java.util.UUID;

public class IdGenerate {

/**
* @param args
*/

public static String getUUIDString() {
String id =
UUID.randomUUID().toString();
id = id.replace("-", "");
return
id;
}

public static void main(String[] args) {
// TODO Auto-generated method
stub
System.out.println(IdGenerate.getUUIDString());
}

}