java随机生成字符串
https://github.com/yhqmcq/infox-cms/blob/master/src/main/java/com/infox/common/util/RandomUtils.java
有修改
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Java代码 package com.pandy.net; import java.util.Random; /** * 项目名称: wp_idea_linux * 功能说明: * 创建者: Pandy, * 邮箱: panyongzheng@163.com, 1453261799@qq.com * 版权: * 官网: * 创建日期: 15-10-13. * 创建时间: 上午11:35. * 修改历史: * ----------------------------------------------- */ public class RandomUtils { 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字符串(只包含大小写字母、数字) * * @param length * 随机字符串长度 * @return 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字符串(只包含大小写字母、数字) * * @param length * 随机字符串长度 * @return 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纯字母字符串(只包含大小写字母) * * @param length * 随机字符串长度 * @return 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(letterChar.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 随机字符串 */ public static String generateLowerString(int length) { return generateString(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 随机字符串 */ public static String generateUpperString(int length) { return generateString(length).toUpperCase(); } /** * 生成一个定长的纯0字符串 * * @param length * 字符串长度 * @return 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 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 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(); } public static void main(String[] args) { System.out.println("generateNumber="+generateNumber(4)); System.out.println("generateString="+generateString(15)); System.out.println("generateMixString="+generateMixString(15)); System.out.println("generateLowerString="+generateLowerString(15)); System.out.println("generateUpperString="+generateUpperString(15)); System.out.println("generateZeroString="+generateZeroString(15)); System.out.println("toFixdLengthString="+toFixdLengthString(123, 15)); System.out.println("toFixdLengthString="+toFixdLengthString(123L, 15)); } } |
