生成流水号
package com.byd.core; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Random; import freemarker.template.SimpleDate; 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() { StringBuffer sb = new StringBuffer(); Random random = new Random(); for (int i = 0; i <=2; i++) { sb.append(numberChar.charAt(random.nextInt(numberChar.length()))); } return sb.toString(); } public static String getDateString(){ @SuppressWarnings("unused") Date date = new Date(); DateFormat format = new SimpleDateFormat("yyyyMMdd"); String reTime = format.format(date); StringBuffer sb= new StringBuffer(reTime); String nDate=sb.substring(2, 8); return nDate; } public static String getZD(String strName){ if(strName.equals("计划")){ return "JH"; }else if(strName.equals("生产")){ return "SC"; }else if(strName.equals("工艺")){ return "工艺"; }else if(strName.equals("宝龙")){ return "BL"; }else if(strName.equals("上海")){ return "SH"; }else if(strName.equals("北京")){ return "BJ"; }else if(strName.equals("葵涌")){ return "KC"; }else{ return "error"; } } public static String getFuction(String strName){ if(strName.equals("发布")){ return "FB"; }else if(strName.equals("报废")){ return "BF"; }else if(strName.equals("冲销")){ return "CX"; }else if(strName.equals("清理")){ return "QL"; }else if(strName.equals("调拨")){ return "DB"; }else if(strName.equals("借用")){ return "JY"; }else if(strName.equals("送样")){ return "SY"; }else if(strName.equals("试产")){ return "SC"; }else if(strName.equals("借出")){ return "JC"; }else{ return "error"; } } public static String getBicker(String str,String str1){ String str2=RandomUtils.getZD(str); String str3=RandomUtils.getFuction(str1); String date=RandomUtils.getDateString(); String num=RandomUtils.generateString(); StringBuffer bf = new StringBuffer(str2); bf.append(str3); bf.append(date); String bicker=bf.append(num).toString(); return bicker; } /** * 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(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 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 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 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(getDateString()); System.out.println(generateString()); // System.out.println(getBicker()); System.out.println(generateMixString(15)); System.out.println(generateLowerString(15)); System.out.println(generateUpperString(15)); System.out.println(generateZeroString(15)); System.out.println(toFixdLengthString(123, 15)); System.out.println(toFixdLengthString(123L, 15)); } }