Created
May 29, 2018 10:23
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Java 短链接生成算法
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public class UrlShortener { | |
// private static final String ALPHABET = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; | |
private static final String ALPHABET = "mUSNcOa6hDgfnEJ1rGMPC03jv4k9RIqL2Yy7TQdH8xu5XFWwAKoZVstizlepBb"; | |
private static final int BASE = ALPHABET.length(); | |
public static String encode(int num) { | |
StringBuilder sb = new StringBuilder(); | |
while (num > 0) { | |
sb.append(ALPHABET.charAt(num % BASE)); | |
num /= BASE; | |
} | |
return sb.reverse().toString(); | |
} | |
public static int decode(String str) { | |
int num = 0; | |
for (int i = 0; i < str.length(); i++) | |
num = num * BASE + ALPHABET.indexOf(str.charAt(i)); | |
return num; | |
} | |
public static void main(String[] args) { | |
for (int i = 14776336; i < 14877336; i++) { | |
System.out.println(encode(i)); | |
} | |
} | |
} |
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