場景:比如說我們這邊有個后台系統,用戶注冊(不讓填寫密碼,密碼由后台生成),如果注冊成功,通過郵件的形式發送給用戶。這樣的場景大家應該都見過吧。這里的密碼就是我們通過這個工具類就可以生成
PasswordUtil.java
package com.mmall.util; import com.mmall.model.SysUser; import java.util.Date; import java.util.Random; public class PasswordUtil { public final static String[] word = { "a", "b", "c", "d", "e", "f", "g", "h", "j", "k", "m", "n", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" }; public final static String[] num = { "2", "3", "4", "5", "6", "7", "8", "9" }; public static String randomPassword() { StringBuffer stringBuffer = new StringBuffer(); Random random = new Random(new Date().getTime()); boolean flag = false; //輸出幾位密碼長度 這里是有可能8 ,9 ,10 位 int length = random.nextInt(3) + 8; for (int i = 0; i < length; i++) { if (flag) { stringBuffer.append(num[random.nextInt(num.length)]); } else { stringBuffer.append(word[random.nextInt(word.length)]); } flag = !flag; } return stringBuffer.toString(); } public static void main(String[] args) throws Exception { System.out.println(randomPassword()); Thread.sleep(100); System.out.println(randomPassword()); Thread.sleep(100); System.out.println(randomPassword()); } }
密碼長度可以變,代碼很簡單。就不詳細介紹了。
