[ISSUE #1241]optimize the codes for issue that Suggestion about the third part...

[ISSUE #1241]optimize the codes for issue that Suggestion about the third part dependency of the RocketMQ client. (#1264)

filter/pom.xml

@@ -37,5 +37,9 @@
             <groupId>${project.groupId}</groupId>
             <artifactId>rocketmq-srvutil</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+        </dependency>
     </dependencies>
 </project>
\ No newline at end of file

srvutil/pom.xml

@@ -41,9 +41,5 @@
             <groupId>commons-cli</groupId>
             <artifactId>commons-cli</artifactId>
         </dependency>
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-        </dependency>
     </dependencies>
 </project>

srvutil/src/main/java/org/apache/rocketmq/srvutil/FileWatchService.java

@@ -17,7 +17,6 @@
 
 package org.apache.rocketmq.srvutil;
 
-import com.google.common.base.Strings;
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
@@ -27,6 +26,7 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.List;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.rocketmq.common.ServiceThread;
 import org.apache.rocketmq.common.UtilAll;
 import org.apache.rocketmq.common.constant.LoggerName;
@@ -49,7 +49,7 @@ public class FileWatchService extends ServiceThread {
         this.fileCurrentHash = new ArrayList<>();
 
         for (int i = 0; i < watchFiles.length; i++) {
-            if (!Strings.isNullOrEmpty(watchFiles[i]) && new File(watchFiles[i]).exists()) {
+            if (StringUtils.isNotEmpty(watchFiles[i]) && new File(watchFiles[i]).exists()) {
                 this.watchFiles.add(watchFiles[i]);
                 this.fileCurrentHash.add(hash(watchFiles[i]));
             }