Fix cache keys

Author: Raysmond

src/main/java/com/raysmond/blog/controllers/TagController.java

@@ -15,9 +15,6 @@
 import static org.springframework.web.bind.annotation.RequestMethod.*;
 import org.springframework.web.bind.annotation.RequestParam;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * @author Raysmond<i@raysmond.com>.
  */

src/main/java/com/raysmond/blog/services/TagService.java

@@ -25,9 +25,9 @@ public class TagService {
     public static final String CACHE_NAME = "cache.tag";
     public static final String CACHE_NAME_TAGS = "cache.tag.all";
 
-    public static final String CACHE_TYPE = "''_Tag_''";
-    public static final String CACHE_KEY = CACHE_TYPE + ".concat(#tagName)";
-    public static final String CACHE_TAG_KEY = CACHE_TYPE + ".concat(#tag.name)";
+    public static final String CACHE_TYPE = "'_Tag_'";
+    public static final String CACHE_KEY = CACHE_TYPE + " + #tagName";
+    public static final String CACHE_TAG_KEY = CACHE_TYPE + " + #tag.name";
 
     @Autowired
     public TagService(TagRepository tagRepository){
@@ -61,4 +61,5 @@ public List<Tag> getAllTags(){
 
         return tags;
     }
+
 }