Update RedisConfig.java

1. 注释写的是 默认两小时, 但是代码写的是 6 小时, 所以应指定哪一个 ? 
2. 当没有出现碰撞时, 固定的 3个 kv 对, size 达到 3 个, 如果方法参数不为空, 则会触发 HashMap 扩容, 影响性能
3 + params.length > (2^2 * 0.75 = 3)
2. 仍然引用的是 apache 的方法, 为了去除歧义, 应使用全类名指定
如果方法返回值包含 null, 则加上 @Nullable 注解, 代码更易读

eladmin-common/src/main/java/me/zhengjie/config/RedisConfig.java

@@ -65,7 +65,7 @@ public class RedisConfig extends CachingConfigurerSupport {
         FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
         RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig();
         configuration = configuration.serializeValuesWith(RedisSerializationContext.
-                SerializationPair.fromSerializer(fastJsonRedisSerializer)).entryTtl(Duration.ofHours(6));
+                SerializationPair.fromSerializer(fastJsonRedisSerializer)).entryTtl(Duration.ofHours(2));
         return configuration;
     }
 
@@ -97,7 +97,7 @@ public class RedisConfig extends CachingConfigurerSupport {
     @Override
     public KeyGenerator keyGenerator() {
         return (target, method, params) -> {
-            Map<String,Object> container = new HashMap<>(3);
+            Map<String,Object> container = new HashMap<>();
             Class<?> targetClassClass = target.getClass();
             // 类地址
             container.put("class",targetClassClass.toGenericString());
@@ -204,9 +204,10 @@ class StringRedisSerializer implements RedisSerializer<Object> {
     }
 
 	@Override
-    public byte[] serialize(Object object) {
+	public @Nullable byte[] serialize(Object object) {
 		String string = JSON.toJSONString(object);
-        if (StringUtils.isBlank(string)) {
+
+		if (org.apache.commons.lang3.StringUtils.isBlank(string)) {
 			return null;
 		}
 		string = string.replace("\"", "");