隨機產生長度為32位的字元作為主鍵
使用RandomStringUtils工具類,可以隨機產生一定的字串,使用該類需要引入apache的commons-lang-2.2.jar包。因為是工具類,在實際使用過程中不需要例項化物件,我便將其構造方法私有化,將產生主鍵的方法做成了static方法,程式碼如下,供大家參考:
package util;
import java.text.SimpleDateFormat; import java.util.Date;
import org.apache.commons.lang.RandomStringUtils;
public class KeyGenerator { private KeyGenerator(){}; public static String generateKeys(){ String key = null; char[] keyChar = { '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' }; String keyHead = RandomStringUtils.random(9, keyChar); Date date = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmss"); String dateStr = sdf.format(date); String keyTail = RandomStringUtils.random(9, keyChar); key = keyHead+dateStr+keyTail; return key; } }