java生成随机不重复id
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package com.ek.util;
import java.util.Random;
public class GetRandomID{
private Random random;
private String table;
public GetRandomID() {
random = new Random();
table = "0123456789";
}
public String randomId() {
int id=random.nextInt(10);
String ret = null,
num = String.format("%05d", id);
int key = random.nextInt(10),
seed = random.nextInt(100);
Caesar caesar = new Caesar(table, seed);
num = caesar.encode(key, num);
ret = num
+ String.format("%01d", key)
+ String.format("%02d", seed);
return ret;
}
/* public static void main(String[] args) {
GetRandomID r = new GetRandomID();
System.out.println("---------------------"+r.randomId()+"-------------------------------------");
} */
public class Caesar {
private String table;
private int seedA = 1103515245;
private int seedB = 12345;
public Caesar(String table, int seed) {
this.table = chaos(table, seed, table.length());
}
public Caesar(String table) {
this(table, 11);
}
public Caesar() {
this(11);
}
public Caesar(int seed) {
this("ABCDEFGHIJKLMNOPQRSTUVWXYZ", seed);
}
public char dict(int i, boolean reverse) {
int s = table.length(), index = reverse ? s - i : i;
return table.charAt(index);
}
public int dict(char c, boolean reverse) {
int s = table.length(), index = table.indexOf(c);
return reverse ? s - index : index;
}
public int seed(int seed) {
long temp = seed;
return (int)((temp * seedA + seedB) & 0x7fffffffL);
}
public String chaos(String data, int seed, int cnt) {
StringBuffer buf = new StringBuffer(data);
char tmp; int a, b, r = data.length();
for (int i = 0; i < cnt; i += 1) {
seed = seed(seed); a = seed % r;
seed = seed(seed); b = seed % r;
tmp = buf.charAt(a);
buf.setCharAt(a, buf.charAt(b));
buf.setCharAt(b, tmp);
}
return buf.toString();
}
public String crypto(boolean reverse,
int key, String text) {
String ret = null;
StringBuilder buf = new StringBuilder();
int m, s = table.length(), e = text.length();
for(int i = 0; i < e; i += 1) {
m = dict(text.charAt(i), reverse);
if (m < 0) break;
m = m + key + i;
buf.append(dict(m % s, reverse));
}
if (buf.length() == e)
ret = buf.toString();
return ret;
}
public String encode(int key, String text) {
return crypto(false, key, text);
}
public String decode(int key, String text) {
return crypto(true , key, text);
}
}
import java.util.Random;
public class GetRandomID{
private Random random;
private String table;
public GetRandomID() {
random = new Random();
table = "0123456789";
}
public String randomId() {
int id=random.nextInt(10);
String ret = null,
num = String.format("%05d", id);
int key = random.nextInt(10),
seed = random.nextInt(100);
Caesar caesar = new Caesar(table, seed);
num = caesar.encode(key, num);
ret = num
+ String.format("%01d", key)
+ String.format("%02d", seed);
return ret;
}
/* public static void main(String[] args) {
GetRandomID r = new GetRandomID();
System.out.println("---------------------"+r.randomId()+"-------------------------------------");
} */
public class Caesar {
private String table;
private int seedA = 1103515245;
private int seedB = 12345;
public Caesar(String table, int seed) {
this.table = chaos(table, seed, table.length());
}
public Caesar(String table) {
this(table, 11);
}
public Caesar() {
this(11);
}
public Caesar(int seed) {
this("ABCDEFGHIJKLMNOPQRSTUVWXYZ", seed);
}
public char dict(int i, boolean reverse) {
int s = table.length(), index = reverse ? s - i : i;
return table.charAt(index);
}
public int dict(char c, boolean reverse) {
int s = table.length(), index = table.indexOf(c);
return reverse ? s - index : index;
}
public int seed(int seed) {
long temp = seed;
return (int)((temp * seedA + seedB) & 0x7fffffffL);
}
public String chaos(String data, int seed, int cnt) {
StringBuffer buf = new StringBuffer(data);
char tmp; int a, b, r = data.length();
for (int i = 0; i < cnt; i += 1) {
seed = seed(seed); a = seed % r;
seed = seed(seed); b = seed % r;
tmp = buf.charAt(a);
buf.setCharAt(a, buf.charAt(b));
buf.setCharAt(b, tmp);
}
return buf.toString();
}
public String crypto(boolean reverse,
int key, String text) {
String ret = null;
StringBuilder buf = new StringBuilder();
int m, s = table.length(), e = text.length();
for(int i = 0; i < e; i += 1) {
m = dict(text.charAt(i), reverse);
if (m < 0) break;
m = m + key + i;
buf.append(dict(m % s, reverse));
}
if (buf.length() == e)
ret = buf.toString();
return ret;
}
public String encode(int key, String text) {
return crypto(false, key, text);
}
public String decode(int key, String text) {
return crypto(true , key, text);
}
// public static void main(String[] args) {
// Caesar caesar = new Caesar();
// String data = caesar.encode(32, "APPLE");
// caesar.decode(32, data);
// }
} // Caesar caesar = new Caesar();
// String data = caesar.encode(32, "APPLE");
// caesar.decode(32, data);
// }
}
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