com.mingsoft.util.RandomUtil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ms-util Show documentation
ms-util tools Library
The newest version!
/**
The MIT License (MIT) * Copyright (c) 2016 铭飞科技(mingsoft.net)

 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.mingsoft.util;

import java.util.Random;

/**
 * 随机数、随即字符串工具
 * @author 王天培QQ:78750478
 * @version 
 * 版本号：100-000-000

 * 创建日期：2012-03-15

 * 历史修订：

 */
public class RandomUtil {
	public static final String allChar = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	public static final String letterChar = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	public static final String numberChar = "0123456789";

	
	/**
	 * 返回一个定长的随机数字(数字)
	 * 
	 * @param length
	 *            随机字符串长度
	 * @return 返回随机字符串
	 */
	public static String generateNumber(int length) {
		StringBuffer sb = new StringBuffer();
		Random random = new Random();
		for (int i = 0; i < length; i++) {
			sb.append(numberChar.charAt(random.nextInt(numberChar.length())));
		}
		return sb.toString();
	}
	
	/**
	 * 返回一个定长的随机字符串(只包含大小写字母、数字)
	 * 
	 * @param length
	 *            随机字符串长度
	 * @return 返回随机字符串
	 */
	public static String generateString(int length) {
		StringBuffer sb = new StringBuffer();
		Random random = new Random();
		for (int i = 0; i < length; i++) {
			sb.append(allChar.charAt(random.nextInt(allChar.length())));
		}
		return sb.toString();
	}

	/**
	 * 返回一个定长的随机纯字母字符串(只包含大小写字母)
	 * 
	 * @param length
	 *            随机字符串长度
	 * @return 返回随机字符串
	 */
	public static String generateMixString(int length) {
		StringBuffer sb = new StringBuffer();
		Random random = new Random();
		for (int i = 0; i < length; i++) {
			sb.append(allChar.charAt(random.nextInt(letterChar.length())));
		}
		return sb.toString();
	}

	/**
	 * 返回一个定长的随机纯大写字母字符串(只包含大小写字母)
	 * 
	 * @param length
	 *            随机字符串长度
	 * @return 返回随机字符串
	 */
	public static String generateLowerString(int length) {
		return generateMixString(length).toLowerCase();
	}

	/**
	 * 返回一个定长的随机纯小写字母字符串(只包含大小写字母)
	 * 
	 * @param length
	 *            随机字符串长度
	 * @return 返回随机字符串
	 */
	public static String generateUpperString(int length) {
		return generateMixString(length).toUpperCase();
	}

	/**
	 * 生成一个定长的纯0字符串
	 * 
	 * @param length
	 *            字符串长度
	 * @return 返回纯0字符串
	 */
	public static String generateZeroString(int length) {
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < length; i++) {
			sb.append('0');
		}
		return sb.toString();
	}

	/**
	 * 根据数字生成一个定长的字符串，长度不够前面补0
	 * 
	 * @param num
	 *            数字
	 * @param fixdlenth
	 *            字符串长度
	 * @return 返回定长的字符串
	 */
	public static String toFixdLengthString(long num, int fixdlenth) {
		StringBuffer sb = new StringBuffer();
		String strNum = String.valueOf(num);
		if (fixdlenth - strNum.length() >= 0) {
			sb.append(generateZeroString(fixdlenth - strNum.length()));
		} else {
			throw new RuntimeException("将数字" + num + "转化为长度为" + fixdlenth+ "的字符串发生异常！");
		}
		sb.append(strNum);
		return sb.toString();
	}

	/**
	 * 根据数字生成一个定长的字符串，长度不够前面补0
	 * 
	 * @param num
	 *            数字
	 * @param fixdlenth
	 *            字符串长度
	 * @return 返回定长的字符串
	 */
	public static String toFixdLengthString(int num, int fixdlenth) {
		StringBuffer sb = new StringBuffer();
		String strNum = String.valueOf(num);
		if (fixdlenth - strNum.length() >= 0) {
			sb.append(generateZeroString(fixdlenth - strNum.length()));
		} else {
			throw new RuntimeException("将数字" + num + "转化为长度为" + fixdlenth + "的字符串发生异常！");
		}
		sb.append(strNum);
		return sb.toString();
	}
	
	/**
	 * 随机生成一个大于零的整数
	 * @param numLength 这个小于多少，如:0~100之间填写100即可
	 * @return 返回生成的随机数
	 */
	public static int rondomOneNum(int numLength){
		Random random = new Random();
		return random.nextInt(numLength);
	}
}