First

src/main/java/com/example/springip/SpringipApplication.java

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+package com.example.springip;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringipApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringipApplication.class, args);
+	}
+
+}

src/main/java/com/example/springip/controllers/TestController.java

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+package com.example.springip.controllers;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Random;
+
+@RestController
+public class TestController {
+    @GetMapping("/test")
+    public String getRandom() {
+        Random random = new Random();
+        return "Your number = " + random.nextInt(0,100);
+    }
+}