Here you can find the source of getRandomString(int length)
public static String getRandomString(int length)
//package com.java2s; /** Copyright (c) 2013 MoMo, yuanhb@fusionskye.com All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License.//www.j av a2 s.c o m * * Project Name : Tools * Package Name : net.yuanmomo.tools.string * Created on : Jun 24, 20133:47:39 PM * File Name : StringUtil.java * * Author : yuanmomo * Blog : yuanmomo.net * Company : ?????????????????????? */ import java.util.Random; public class Main { public static String getRandomString(int length) { if (length <= 0) { length = 10; } char[] pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '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' }; StringBuilder result = new StringBuilder(); int n = pattern.length; Random random = new Random(); for (int i = 0; i < length; i++) { int rnd = random.nextInt(n); result.append(pattern[rnd]); } return result.toString(); } }