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package cn.wisenergy.chnmuseum.party.common.util;
import java.util.Random;
public class RandomUtil {
public static String[] arr = {
"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",
"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"
};
/**
* 创建指定数量的随机字符串
*
* @param length
* @return
*/
public static String createRandom(int length) {
String retStr = null;
String strTable = "1234567890";
int len = strTable.length();
boolean bDone = true;
do {
retStr = "";
int count = 0;
for (int i = 0; i < length; i++) {
double dblR = Math.random() * len;
int intR = (int) Math.floor(dblR);
char c = strTable.charAt(intR);
if (('0' <= c) && (c <= '9')) {
count++;
}
retStr += strTable.charAt(intR);
}
if (count >= 2) {
bDone = false;
}
} while (bDone);
return retStr;
}
public static String createLetterRandom(int length) {
StringBuilder retStr;
String strTable = "1234567890abcdef";
int len = strTable.length();
boolean bDone = true;
do {
retStr = new StringBuilder();
int count = 0;
for (int i = 0; i < length; i++) {
double dblR = Math.random() * len;
int intR = (int) Math.floor(dblR);
char c = strTable.charAt(intR);
if (('0' <= c) && (c <= '9')) {
count++;
}
retStr.append(strTable.charAt(intR));
}
if (count >= 2) {
bDone = false;
}
} while (bDone);
return retStr.toString();
}
public static String createCipher(int length) {
StringBuilder retStr;
String strTable = "1234567890abcdef";
int len = strTable.length();
boolean bDone = true;
do {
retStr = new StringBuilder();
int count = 0;
for (int i = 0; i < length; i++) {
double dblR = Math.random() * len;
int intR = (int) Math.floor(dblR);
char c = strTable.charAt(intR);
if (('0' <= c) && (c <= '9')) {
count++;
}
retStr.append(strTable.charAt(intR));
}
if (count >= 2) {
bDone = false;
}
} while (bDone);
return retStr.toString();
}
public static String getRandom(Integer len) {
String nums = "";
for (int i = 0; i < len; i++) {
Random r = new Random();
int index = r.nextInt(arr.length - 1);
String str = arr[index];
nums = nums + str;
}
return nums;
}
}