add spring boot configuration properties example

apollo-demo/pom.xml

@@ -13,8 +13,7 @@
 	<properties>
 		<java.version>1.7</java.version>
 		<github.path>${project.artifactId}</github.path>
-        <!-- apollo spring integration requires Spring 3.1.1+ -->
-		<spring-demo.version>3.1.1.RELEASE</spring-demo.version>
+		<spring-demo.version>4.3.6.RELEASE</spring-demo.version>
 	</properties>
 	<dependencyManagement>
 		<dependencies>
@@ -72,6 +71,21 @@
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-context</artifactId>
 		</dependency>
+		<!-- for spring boot demo -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+			<exclusions>
+				<exclusion>
+					<groupId>org.springframework.boot</groupId>
+					<artifactId>spring-boot-starter-logging</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-log4j2</artifactId>
+		</dependency>
         <!-- required for spring 3.1.0 -->
 		<dependency>
 			<groupId>cglib</groupId>

apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/spring/SpringBootSampleApplication.java

+package com.ctrip.framework.apollo.demo.spring;
+
+import com.ctrip.framework.apollo.demo.spring.config.SampleRedisConfig;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.annotation.Bean;
+
+import java.util.Scanner;
+
+/**
+ * @author Jason Song
+ */
+@SpringBootApplication
+public class SpringBootSampleApplication {
+  @Bean
+  public SampleRedisConfig sampleRedisConfig() {
+    return new SampleRedisConfig();
+  }
+
+  public static void main(String[] args) {
+    new SpringApplicationBuilder(SpringBootSampleApplication.class).run(args);
+    onKeyExit();
+  }
+
+  private static void onKeyExit() {
+    System.out.println("Press Enter to exit...");
+    new Scanner(System.in).nextLine();
+  }
+}

apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/spring/bean/AnnotatedBean.java

@@ -51,6 +51,9 @@ public class AnnotatedBean {
       logger.info("[someChangeHandler]Change - key: {}, oldValue: {}, newValue: {}, changeType: {}",
           change.getPropertyName(), change.getOldValue(), change.getNewValue(),
           change.getChangeType());
+      if (key.equals("timeout")) {
+        refreshTimeout();
+      }
     }
   }
 
@@ -64,4 +67,10 @@ public class AnnotatedBean {
           change.getChangeType());
     }
   }
+
+  private void refreshTimeout() {
+    //do some custom logic to update placeholder value
+    timeout = config.getIntProperty("timeout", timeout);
+    logger.info("Refreshing timeout to {}", timeout);
+  }
 }

apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/spring/config/SampleRedisConfig.java

+package com.ctrip.framework.apollo.demo.spring.config;
+
+import com.ctrip.framework.apollo.demo.spring.bean.AnnotatedBean;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import javax.annotation.PostConstruct;
+
+/**
+ * @author Jason Song
+ */
+@ConfigurationProperties(prefix = "redis.cache")
+public class SampleRedisConfig {
+  private static final Logger logger = LoggerFactory.getLogger(SampleRedisConfig.class);
+
+  private int expireSeconds;
+  private String clusterNodes;
+  private int commandTimeout;
+
+  @PostConstruct
+  private void init() {
+    logger.info("ConfigurationProperties sample - expireSeconds: {}, clusterNodes: {}, commandTimeout: {}",
+        expireSeconds, clusterNodes, commandTimeout);
+  }
+
+  public void setExpireSeconds(int expireSeconds) {
+    this.expireSeconds = expireSeconds;
+  }
+
+  public void setClusterNodes(String clusterNodes) {
+    this.clusterNodes = clusterNodes;
+  }
+
+  public void setCommandTimeout(int commandTimeout) {
+    this.commandTimeout = commandTimeout;
+  }
+}