Example API code

pi4j-spring-boot-starter-sample-app/src/main/java/com/pi4j/spring/boot/sample/app/controller/Pi4JController.java

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+package com.pi4j.spring.boot.sample.app.controller;
+
+import com.pi4j.context.Context;
+import com.pi4j.io.gpio.digital.DigitalOutput;
+import com.pi4j.io.gpio.digital.DigitalState;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/pi4j/")
+public class Pi4JController {
+
+    private static final int PIN_LED = 22; // PIN 15 = BCM 22
+    private DigitalOutput led;
+
+    public Pi4JController(@Autowired Context pi4j) {
+        // LED example is based on https://www.pi4j.com/getting-started/minimal-example-application/
+        pi4j.digitalOutput().create(PIN_LED);
+    }
+
+    @GetMapping("/led/{status}")
+    public String setLedStatus(@PathVariable Boolean status) {
+        try {
+            led.state(status ? DigitalState.HIGH : DigitalState.LOW);
+            return "LED status set to " + (status ? "ON" : "OFF");
+        } catch (Exception e) {
+            return "Error while changing the LED status: " + e.getMessage();
+        }
+    }
+}