Hello world

PC25-Spring/src/main/java/com/example/demo/PierwszyKontroler.java

+package com.example.demo;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class PierwszyKontroler {
+
+    @GetMapping("/hello")
+    @ResponseBody
+    public String hello() {
+        return "Hello world";
+    }
+    
+}