diff --git a/spring-boot-demo-02-1/src/main/java/com/roncoo/education/SpringBootDemo21Application.java b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/SpringBootDemo21Application.java
index f6b6e99..c65c1cf 100644
--- a/spring-boot-demo-02-1/src/main/java/com/roncoo/education/SpringBootDemo21Application.java
+++ b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/SpringBootDemo21Application.java
@@ -7,6 +7,7 @@
 public class SpringBootDemo21Application {
 
 	public static void main(String[] args) {
+         System.out.println("test");
 		SpringApplication.run(SpringBootDemo21Application.class, args);
 	}
 }
diff --git a/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/IndexController.java b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/IndexController.java
index 2e21dc8..e668a8b 100644
--- a/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/IndexController.java
+++ b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/IndexController.java
@@ -6,6 +6,7 @@
 import java.util.Date;
 import java.util.HashMap;
 
+import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -15,7 +16,7 @@
 
 /**
  * spring-boot-demo-2-1
- * 
+ *
  * @author wujing
  */
 @RestController
diff --git a/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/UserRepo.java b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/UserRepo.java
new file mode 100644
index 0000000..10f6135
--- /dev/null
+++ b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/UserRepo.java
@@ -0,0 +1,8 @@
+package com.roncoo.education.controller;
+
+import com.roncoo.education.bean.User;
+
+public interface UserRepo{
+
+    User createUser();
+}
\ No newline at end of file
diff --git a/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/UserRepoImpl.java b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/UserRepoImpl.java
new file mode 100644
index 0000000..7edae91
--- /dev/null
+++ b/spring-boot-demo-02-1/src/main/java/com/roncoo/education/controller/UserRepoImpl.java
@@ -0,0 +1,12 @@
+package com.roncoo.education.controller;
+
+import com.roncoo.education.bean.User;
+
+public class UserRepoImpl implements UserRepo{
+
+	@Override
+	public User createUser() {
+		return null;
+	}
+
+}
\ No newline at end of file