Java工具类(生成6位随机密码)

/**

 * 生成6位随机密码

 * */

public class CreatePasswordUtil {

      

       private static Random getR = new Random();

      

       public static void main(String[] args) {

            String print = getDigitalAndabcPwd();

            System. out.println(print);

      }

      

       //6为数字的随机密码

       public static long getDigitalPwd() {

             long pass = Math.round(Math. random()*899999+100000);

             return pass;

      }

       //6位随机密码，包括3位数字3位字母（字母区分大小写）

       public static String getDigitalAndabcPwd() {

            String s = "";

             int n = 0;

             int m = 0;

             for (int i = 0; i < 6; i++) {

                   if (n == 3) {

                        s += CreatePasswordUtil. getSz();

                        m++;

                  } else if (m == 3) {

                        s += CreatePasswordUtil. getZm();

                        n++;

                  } else {

                         int ri = getR .nextInt(2);

                         int temp = ri == 0 ? m++ : n++;

                        s += ri == 0 ? CreatePasswordUtil. getSz() : CreatePasswordUtil.getZm();

                  }

            }

             return s;

      }

       // 随机数字的字母，区分大小写

       private static String getZm() {

             char sSS = (char) (getR.nextInt(26) + 97); // 小写字母97--122=a---z

             char sBs = (char) (getR.nextInt(26) + 65); // 大写65--90=A----Z

             char[] stemp = { sSS, sBs };

             int i = getR .nextInt(2);

            String sS = String. valueOf(stemp[i]);

             return sS;

      }

       // 随机数字的字符串

       private static String getSz() {

             int getI = getR.nextInt(10) + 48;// 数字48--57=0---9

            String sI = String. valueOf((char) getI);

             return sI;

      }

}