feat: commons-lang 적용

Author: chcch529

build.gradle

@@ -58,6 +58,9 @@ dependencies {
 
     // bucket4j
     implementation 'com.bucket4j:bucket4j_jdk17-core:8.14.0'
+
+    // commons-lang3
+    implementation 'org.apache.commons:commons-lang3:3.18.0'
 }
 
 tasks.named('test') {

src/main/java/com/oronaminc/join/room/util/CodeGenerator.java

@@ -1,21 +1,16 @@
 package com.oronaminc.join.room.util;
 
-import java.util.Random;
-
 import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
+import org.apache.commons.lang3.RandomStringUtils;
 
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class CodeGenerator {
+
     private static final String CHAR_POOL = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
-    private static final Random random = new Random();
 
     public static String generateCode(int length) {
-        StringBuilder sb = new StringBuilder(length);
-        for (int i = 0; i < length; i++) {
-            int idx = random.nextInt(CHAR_POOL.length());
-            sb.append(CHAR_POOL.charAt(idx));
-        }
-        return sb.toString();
+
+        return RandomStringUtils.random(length, CHAR_POOL);
     }
 }