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src/main/java/tech/nevets/beerestapi/Main.java

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+package tech.nevets.beerestapi;
+
+import io.javalin.Javalin;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class Main {
+    public static ArrayList<String> urls = new ArrayList<>();
+
+    public static void main(String[] args) {
+        getImageUrlList();
+        Javalin app = Javalin.create().start(8080);
+
+        app.get("/", ctx -> {
+            ctx.json("{\"link\": \"https://img.nevets.tech/" + getRandomUrl() + "\"}");
+        });
+    }
+
+    public static void getImageUrlList() {
+        String line;
+        BufferedReader in = null;
+
+        try {
+            in = new BufferedReader(new FileReader("./image-urls.txt"));
+            while ((line = in.readLine()) != null) {
+                urls.add(line);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                in.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    public static String getRandomUrl() {
+        Random rand = ThreadLocalRandom.current();
+        int i = rand.nextInt(urls.size());
+        return urls.get(i);
+    }
+}