sync & commit in finchley

spring-cloud-alibaba-examples/nacos-example/nacos-config-example/src/main/java/com/alibaba/cloud/examples/Application.java

@@ -1,5 +1,14 @@
 package com.alibaba.cloud.examples;
 
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.Properties;
+import java.util.concurrent.Executor;
+
+import com.alibaba.cloud.nacos.NacosConfigManager;
+import com.alibaba.nacos.api.config.listener.Listener;
+
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.ApplicationArguments;
 import org.springframework.boot.ApplicationRunner;
@@ -11,11 +20,10 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 /**
- * @author xiaojing
+ * @author xiaojing, Jianwei Mao
  */
 @SpringBootApplication
 public class Application {
-
 	public static void main(String[] args) {
 		SpringApplication.run(Application.class, args);
 	}
@@ -27,13 +35,47 @@ class SampleRunner implements ApplicationRunner {
 	@Value("${user.name}")
 	String userName;
 
-	@Value("${user.age}")
+	@Value("${user.age:25}")
 	int userAge;
 
+	@Autowired
+	private NacosConfigManager nacosConfigManager;
+
 	@Override
 	public void run(ApplicationArguments args) throws Exception {
-		System.out.println(userName);
-		System.out.println(userAge);
+		System.out.println(
+				String.format("Initial username=%s, userAge=%d", userName, userAge));
+
+		nacosConfigManager.getConfigService().addListener(
+				"nacos-config-example.properties", "DEFAULT_GROUP", new Listener() {
+
+					/**
+					 * Callback with latest config data.
+					 *
+					 * For example, config data in Nacos is:
+					 *
+					 * user.name=Nacos user.age=25
+					 *
+					 * @param configInfo latest config data for specific dataId in Nacos
+					 *     server
+					 */
+					@Override
+					public void receiveConfigInfo(String configInfo) {
+						Properties properties = new Properties();
+						try {
+							properties.load(new StringReader(configInfo));
+						}
+						catch (IOException e) {
+							e.printStackTrace();
+						}
+						System.out.println("config changed: " + properties);
+					}
+
+					@Override
+					public Executor getExecutor() {
+						return null;
+					}
+				});
 	}
 }
 
@@ -44,7 +86,7 @@ class SampleController {
 	@Value("${user.name}")
 	String userName;
 
-	@Value("${user.age}")
+	@Value("${user.age:25}")
 	int age;
 
 	@RequestMapping("/user")