完善一些例子
diff --git a/samples/foo/pom.xml b/samples/foo/pom.xml
index 3bd8bde..d23ba91 100644
--- a/samples/foo/pom.xml
+++ b/samples/foo/pom.xml
@@ -26,6 +26,11 @@
 
     <dependency>
       <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-json</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-thymeleaf</artifactId>
     </dependency>