添加了hello Controller

src/main/java/org/example/docker_project/Controller/HelloController.java

@@ -4,12 +4,10 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
-public class HelloController
+public class HelloController {
-{
+
-    @GetMapping("/")
+    @GetMapping("/hello")
-    public String index()
+    public String sayHello() {
-    {
+        return "Hello from Spring Boot in Docker!";
-        return "Hello World!";
     }
 }
-