CodeCreator.java
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/**
*
*/
/**
*
*/
package com.bjivt.util;
/**
* @编码创建器
*/
public final class CodeCreator {
private final static char[] letter = { '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', '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' };
private final static char[] lowerLetter = {'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' };
private final static char[] numberLetter = {'0', '1', '2', '3', '4', '5', '6',
'7', '8', '9'};
private final static char[] numberLetters = {'1', '2', '3', '4', '5', '6',
'7', '8', '9'};
private CodeCreator() {
}
/**
* 创建数字随机数串
* @param n
* @return
*/
public static String generateNumberArr(int n) {
boolean[] flag = new boolean[numberLetter.length];
char[] result = new char[n];
for (int i = 0; i < n; i++) {
int index;
do {
index = (int) (Math.random() * (numberLetter.length));
result[i] = (char) (Math.random() * (numberLetter.length));
} while (flag[index]);
result[i] = numberLetter[index];
flag[index] = true;
}
return String.valueOf(result);
}
/**
* 创建数字随机数串
* @param n
* @return
*/
public static String generateNumberArr1(int n) {
char[] result = new char[n];
for (int i = 0; i < n; i++) {
int index;
index = (int) (Math.random() * (numberLetters.length));
result[i] = (char) (Math.random() * (numberLetters.length));
result[i] = numberLetters[index];
}
return String.valueOf(result);
}
/**
* 创建数字+字符的随机字符串
* @param n
* @return
*/
public static String generateCharArr(int n) {
boolean[] flag = new boolean[letter.length];
char[] result = new char[n];
for (int i = 0; i < n; i++) {
int index;
do {
index = (int) (Math.random() * (letter.length));
result[i] = (char) (Math.random() * (letter.length));
} while (flag[index]);
result[i] = letter[index];
flag[index] = true;
}
return String.valueOf(result);
}
/*
* 创建数字+大写字母的随机字符串
*/
public static String getUpperCaseCode(int n) {
return generateCharArr(n).toUpperCase();
}
/*
* 创建数字+小写字母的随机字符串
*/
public static String generateLowerCharArr(int n) {
boolean[] flag = new boolean[lowerLetter.length];
char[] result = new char[n];
for (int i = 0; i < n; i++) {
int index;
do {
index = (int) (Math.random() * (lowerLetter.length));
result[i] = (char) (Math.random() * (lowerLetter.length));
} while (flag[index]);
result[i] = lowerLetter[index];
flag[index] = true;
}
return String.valueOf(result);
}
/**
* 创建扰乱编码
* */
public static String generateEntityId(String id ){
return generateLowerCharArr(4)+id+generateLowerCharArr(4);
}
/**
* 恢复编码、
* */
public static String recoverEntityId(String id){
if(StringUtils.isEmpty(id)){
return null;
}
return StringUtils.substring(id, 4, id.length()-4);
}
}