diff --git a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/configuration/BeanConfiguration.java b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/configuration/BeanConfiguration.java
index a635f36a0..f9ab3cc01 100644
--- a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/configuration/BeanConfiguration.java
+++ b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/configuration/BeanConfiguration.java
@@ -17,11 +17,12 @@
 package com.alibaba.cloud.examples.configuration;
 
 import com.alibaba.cloud.examples.model.NacosConfigInfo;
+
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 /**
- * Bean definition
+ * Bean definition.
  *
  * @author lixiaoshuang
  */
diff --git a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/BeanAutoRefreshConfigExample.java b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/BeanAutoRefreshConfigExample.java
index 04318fc87..cdb3318a7 100644
--- a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/BeanAutoRefreshConfigExample.java
+++ b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/BeanAutoRefreshConfigExample.java
@@ -16,17 +16,18 @@
 
 package com.alibaba.cloud.examples.example;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import com.alibaba.cloud.examples.model.NacosConfigInfo;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
- * Dynamic bean refresh example
+ * Dynamic bean refresh example.
  *
  * @author lixiaoshuang
  */
diff --git a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ConfigListenerExample.java b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ConfigListenerExample.java
index b6a4e294f..a4e2c639b 100644
--- a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ConfigListenerExample.java
+++ b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ConfigListenerExample.java
@@ -16,17 +16,19 @@
 
 package com.alibaba.cloud.examples.example;
 
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+import javax.annotation.PostConstruct;
+
 import com.alibaba.cloud.nacos.NacosConfigManager;
 import com.alibaba.nacos.api.config.ConfigService;
 import com.alibaba.nacos.api.config.listener.Listener;
 import com.alibaba.nacos.api.exception.NacosException;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
-import javax.annotation.PostConstruct;
-import java.util.concurrent.Executor;
-import java.util.concurrent.Executors;
-
 /**
  * Configuration listener example.
  *
@@ -35,8 +37,14 @@ import java.util.concurrent.Executors;
 @Component
 public class ConfigListenerExample {
 
+	/**
+	 * Nacos dataId.
+	 */
 	public static final String DATA_ID = "nacos-config-example.properties";
 
+	/**
+	 * Nacos group.
+	 */
 	public static final String GROUP = "DEFAULT_GROUP";
 
 	@Autowired
diff --git a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/DockingInterfaceExample.java b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/DockingInterfaceExample.java
index 7cefc6baa..6cba30783 100644
--- a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/DockingInterfaceExample.java
+++ b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/DockingInterfaceExample.java
@@ -16,20 +16,21 @@
 
 package com.alibaba.cloud.examples.example;
 
+import java.util.concurrent.Executor;
+
 import com.alibaba.cloud.commons.lang.StringUtils;
 import com.alibaba.cloud.nacos.NacosConfigManager;
 import com.alibaba.nacos.api.config.ConfigService;
 import com.alibaba.nacos.api.config.listener.Listener;
 import com.alibaba.nacos.api.exception.NacosException;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
-import java.util.concurrent.Executor;
-
 /**
- * Example of docking with Nacos interface
+ * Example of docking with Nacos interface.
  *
  * @author lixiaoshuang
  */
@@ -37,18 +38,20 @@ import java.util.concurrent.Executor;
 @RequestMapping("nacos")
 public class DockingInterfaceExample {
 
+	/**
+	 * Nacos group.
+	 */
 	public static final String DEFAULT_GROUP = "DEFAULT_GROUP";
 
 	@Autowired
 	private NacosConfigManager nacosConfigManager;
 
 	/**
-	 * Get configuration information
+	 * Get configuration information.
 	 *
-	 * @param dataId
-	 * @param group
-	 * @return
-	 * @throws NacosException
+	 * @param dataId dataId
+	 * @param group group
+	 * @return config
 	 */
 	@RequestMapping("getConfig")
 	public String getConfig(@RequestParam("dataId") String dataId,
@@ -62,13 +65,12 @@ public class DockingInterfaceExample {
 	}
 
 	/**
-	 * Publish configuration
+	 * Publish configuration.
 	 *
-	 * @param dataId
-	 * @param group
-	 * @param content
-	 * @return
-	 * @throws NacosException
+	 * @param dataId dataId
+	 * @param group group
+	 * @param content content
+	 * @return boolean
 	 */
 	@RequestMapping("publishConfig")
 	public boolean publishConfig(@RequestParam("dataId") String dataId,
@@ -82,12 +84,11 @@ public class DockingInterfaceExample {
 	}
 
 	/**
-	 * Delete configuration
+	 * Delete configuration.
 	 *
-	 * @param dataId
-	 * @param group
-	 * @return
-	 * @throws NacosException
+	 * @param dataId dataId
+	 * @param group group
+	 * @return boolean
 	 */
 	@RequestMapping("remoteConfig")
 	public boolean remoteConfig(@RequestParam("dataId") String dataId,
@@ -101,11 +102,10 @@ public class DockingInterfaceExample {
 	}
 
 	/**
-	 * Add listener configuration information
+	 * Add listener configuration information.
 	 *
-	 * @param dataId
-	 * @param group
-	 * @throws NacosException
+	 * @param dataId dataId
+	 * @param group group
 	 */
 	@RequestMapping("listener")
 	public String listenerConfig(@RequestParam("dataId") String dataId,
diff --git a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ValueAnnotationExample.java b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ValueAnnotationExample.java
index 32c2687a3..c58a1b03e 100644
--- a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ValueAnnotationExample.java
+++ b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/example/ValueAnnotationExample.java
@@ -16,17 +16,17 @@
 
 package com.alibaba.cloud.examples.example;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.cloud.context.config.annotation.RefreshScope;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
- * Use the @Value annotation to get configuration example
+ * Use the @Value annotation to get configuration example.
  *
  * @author lixiaoshuang
  */
diff --git a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/model/NacosConfigInfo.java b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/model/NacosConfigInfo.java
index b77458166..870f5922e 100644
--- a/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/model/NacosConfigInfo.java
+++ b/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/model/NacosConfigInfo.java
@@ -24,22 +24,22 @@ import org.springframework.cloud.context.config.annotation.RefreshScope;
 public class NacosConfigInfo {
 
 	/**
-	 * Nacos server address
+	 * Nacos server address.
 	 */
 	private String serveraddr;
 
 	/**
-	 * Data Id prefix
+	 * Data Id prefix.
 	 */
 	private String prefix;
 
 	/**
-	 * Nacos group
+	 * Nacos group.
 	 */
 	private String group;
 
 	/**
-	 * Nacos namespace
+	 * Nacos namespace.
 	 */
 	private String namespace;