Switched to JavaFX and added builtin Support

src/main/java/org/openautonomousconnection/luascript/fx/FxWebViewResourceHost.java

@@ -0,0 +1,56 @@
+package org.openautonomousconnection.luascript.fx;
+
+import javafx.scene.web.WebEngine;
+import org.openautonomousconnection.luascript.fx.FxThreadBridge;
+import org.openautonomousconnection.luascript.hosts.ResourceHost;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.net.URLConnection;
+import java.nio.charset.StandardCharsets;
+import java.util.Objects;
+
+/**
+ * ResourceHost that loads script src via URLConnection.
+ *
+ * <p>Relative URLs are resolved against the current WebEngine location.</p>
+ */
+public final class FxWebViewResourceHost implements ResourceHost {
+
+    private final WebEngine engine;
+
+    /**
+     * Creates a new resource host.
+     *
+     * @param engine web engine
+     */
+    public FxWebViewResourceHost(WebEngine engine) {
+        this.engine = Objects.requireNonNull(engine, "engine");
+    }
+
+    @Override
+    public String readText(String src) throws Exception {
+        Objects.requireNonNull(src, "src");
+        String trimmed = src.trim();
+        if (trimmed.isEmpty()) throw new IllegalArgumentException("src is empty");
+
+        String base = FxThreadBridge.callAndWait(engine::getLocation);
+        URL url = (base == null || base.isBlank())
+                ? new URL(trimmed)
+                : new URL(new URL(base), trimmed);
+
+        URLConnection con = url.openConnection();
+        con.setUseCaches(false);
+
+        try (BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), StandardCharsets.UTF_8))) {
+            StringBuilder sb = new StringBuilder(4096);
+            char[] buf = new char[8192];
+            int r;
+            while ((r = br.read(buf)) >= 0) {
+                sb.append(buf, 0, r);
+            }
+            return sb.toString();
+        }
+    }
+}