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import java.util.HashSet;
import java.util.Random;
import java.util.Set;
public class GenSerial {
private static final String Base32Alphabet = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";
/**
* 生成新的序列号 <br>
* <p>生成规则：45位的数 （二进制）<br>
* 标识位 + 数据位 + 校验位 <br>
* 然后将55位的数映射到用 ABCDEFGHJKLMNPQRSTUVWXYZ23456789 表示的序列号，要映射到32个字符中就是每5位代表一个字符(2^5=32)，
* 所有生成的序列号是 45/5=9位。
*
* @param codeLen code长度
* @param flag 标识
* @param flagBitLen 标识长度
* @param checkBitLen 校验位长度
* @return
*/
public static String generateNewCode(int codeLen, int flag, int flagBitLen, int checkBitLen) {
Long ret = 0L; // 长整形ID
Random random = new Random();
int checkModData = 1<<checkBitLen;
int totalBitLen = codeLen*5;
int dataBitLen = totalBitLen - checkBitLen - flagBitLen;
long randData = (long)(1 + (1L<<dataBitLen - 1) * random.nextDouble());
if(flagBitLen > 0){
flag = flag & ((1<<flagBitLen) - 1); //防止越位，若16位标识则是 0xffff
ret += (long)flag << (totalBitLen - flagBitLen); //高位标志位
}
ret += randData << checkBitLen; // 中位数据位
long checkNum = (ret >> checkBitLen) % checkModData; //低位校验位
ret += checkNum; // 1 - 7位 校验位
return convertToBase32SerialCode(ret, codeLen);
}
public static String generateNewCode(int flag, int flagBitLen) {
return generateNewCode(9, flag, flagBitLen, 7); //生成码9位，活动id 16位
}
public static String generateNewCode(int flag) {
int flagBitLen = 0;
if(flag == 0){
flagBitLen = 0;
}else{
flagBitLen = Integer.toBinaryString(flag).length();
}
return generateNewCode(9, flag, flagBitLen, 7); //生成码9位
}
public static String generateNewCode() {
return generateNewCode(9, 0, 0, 7); //生成码9位
}
/**
*
* @param historyCodeSet 历史生成的序列号 集合
* @param number
* @param codeLen
* @param flag
* @param flagBitLen
* @param checkBitLen
* @return
*/
public static Set<String> generateCodes(Set<String> historyCodeSet, int number, int codeLen, int flag, int flagBitLen, int checkBitLen){
Set<String> generatedCodes = new HashSet<String>(number*4/3+1);
if(historyCodeSet == null){
historyCodeSet = new HashSet<String>(0);
}
while(generatedCodes.size()<number){
String code = generateNewCode(codeLen, flag, flagBitLen, checkBitLen);
if(!historyCodeSet.contains(code)){
generatedCodes.add(code);
}
}
return generatedCodes;
}
/**
*
* @param historyCodeSet
* @param number
* @return
*/
public static Set<String> generateCodes(Set<String> historyCodeSet, int number, int codeLen){
return generateCodes(historyCodeSet, number, codeLen, 0, 0, 7);
}
/**
*
* @param historyCodeSet
* @param number
* @return
*/
public static Set<String> generateCodes(Set<String> historyCodeSet, int number){
return generateCodes(historyCodeSet, number, 9, 0, 0, 7);
}
/**
* 将随机数转换成BASE32编码 序列码
*
* @return
*/
private static String convertToBase32SerialCode(long longRandValue, int codeLen) {
StringBuffer codeSerial = new StringBuffer(16);
long tmpRandValue = longRandValue;
for (int i = 0; i < codeLen; i++) {
int code = (int) (tmpRandValue & 0x1F);
char convertCode = Base32Alphabet.charAt(code);
codeSerial.append(convertCode);
tmpRandValue = tmpRandValue >> 5;
}
return codeSerial.reverse().toString();
}
/**
* 将兑换码序列字符转化成数字。
*
* @return
*/
private static int convertBase32CharToNum(char ch) {
int index = Base32Alphabet.indexOf(ch);
return index;
}
/**
* 将序列号转成长整数
*
* @return
*/
public static long convertBase32CharToNum(String serialCode) {
long id = 0;
for (int i = 0; i < serialCode.length(); i++) {
int originNum = convertBase32CharToNum(serialCode.charAt(i));
if(originNum == -1){
return 0;
}
id = id << 5;
id += originNum;
}
return id;
}
/**
* 校验序列号是否合法
*
* @param code
* @return
*/
public static boolean checkCodeValid(String code, int checkBitLen) {
long id = 0;
int checkModData = 1<<checkBitLen;
for (int i = 0; i < code.length(); ++i) {
long originNum = convertBase32CharToNum(code.charAt(i));
if (originNum >= 32)
return false; // 字符非法
id = id<<5;
id += originNum;
}
long data = id >> checkBitLen;
long checkNum = id & (checkModData-1); // 最后7位是校验码
if (data % checkModData == checkNum)
return true;
return false;
}
public static boolean checkCodeValid(String code) {
if(code == null || code.length() == 0){
return false;
}
return checkCodeValid(code, 7);
}
/**
* 从序列号提取标识
*
* @param code 序列号
* @param flagBitLen 标识位长度
* @return
*/
public static Long getFlagFromCode(String code, int flagBitLen){
long id = convertBase32CharToNum(code);
return id >> (code.length()*5-flagBitLen);
}
public static void main(String[] args) {
System.out.println(checkCodeValid("ARXX2BWTE"));
long sTime = System.currentTimeMillis();
long eTime = 0L;
Set<String> codes = generateCodes(null, 7000000, 9, 0, 0, 7);
eTime = System.currentTimeMillis();
System.out.println("耗时 " + (eTime-sTime)/1000 + "秒");
sTime = eTime;
Set<String> codes2 = generateCodes(codes, 2000000, 9, 0, 0, 7);
codes2.size();
eTime = System.currentTimeMillis();
System.out.println("耗时 " + (eTime-sTime)/1000 + "秒");
String code = generateNewCode(1,10);
System.out.println("序列号: "+code);
boolean checkRs = checkCodeValid(code);
System.out.println("序列号" + code + "是否合法：" + checkRs);
long acId = getFlagFromCode(code,10);
System.out.println("标识: " + acId);
long numCode = convertBase32CharToNum(code);
System.out.println("数字序列号 " + numCode);
}
}