🎨 短链算法

alis-rpc/alis-rpc-common/src/main/java/org/alis/rpc/common/util/HashShortUrl.java

@@ -0,0 +1,43 @@
+package org.alis.rpc.common.util;
+
+import cn.hutool.core.lang.hash.MurmurHash;
+
+import java.util.stream.IntStream;
+
+/**
+ * @author lc
+ * @date 2023/5/27 15:06
+ */
+public class HashShortUrl{
+
+    private static final String[] CHARS = new String[62];
+
+    static {
+        IntStream.range(0, 10).forEach(i -> CHARS[i] = String.valueOf(i));
+        for (int i = 1; i <= 26; i++) {
+            CHARS[9 + i] = String.valueOf((char) (i + 64));
+        }
+        for (int i = 1; i <= 26; i++) {
+            CHARS[35 + i] = String.valueOf((char) (i + 96));
+        }
+
+    }
+
+
+    public String generator(String old) {
+        int i = MurmurHash.hash32(old);
+        if (i < 0) {
+            i = Math.abs(i);
+        }
+        int num = Integer.MAX_VALUE - i;
+        StringBuilder sb = new StringBuilder();
+        while (num > 0) {
+            int x = num % CHARS.length;
+            sb.append(CHARS[x]);
+            num /= CHARS.length;
+        }
+        return sb.reverse().toString();
+
+
+    }
+}