add redis conf, add annotation

springBootBlog/src/main/java/com/yen/mdblog/BlogApplication.java

@@ -2,7 +2,9 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
 
+@EnableCaching
 @SpringBootApplication
 public class BlogApplication {
   public static void main(String[] args) {

springBootBlog/src/main/java/com/yen/mdblog/config/RedisCacheConfig.java

@@ -0,0 +1,27 @@
+package com.yen.mdblog.config;
+
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+//import org.springframework.cache.redis.RedisCacheManager;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.cache.RedisCacheManager;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.RedisTemplate;
+
+@Configuration
+@EnableCaching
+public class RedisCacheConfig {
+
+    @Bean
+    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
+        RedisTemplate<Object, Object> template = new RedisTemplate<>();
+        template.setConnectionFactory(connectionFactory);
+        return template;
+    }
+
+    @Bean
+    public CacheManager cacheManager(RedisConnectionFactory connectionFactory) {
+        return RedisCacheManager.builder(connectionFactory).build();
+    }
+}