How to display a html page in java using its source code?

Question

I have a PageRead class and methods which will download the html source code from a given url.

public class PageRead {
public static StringBuilder readPage(String pageAddr) {
try {
URL url = new URL(pageAddr);
BufferedReader reader = new BufferedReader(new 
InputStreamReader(url.openStream()));

String line;
StringBuilder sb=new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line+"\n");
}
reader.close();
return sb;            
} 

catch (MalformedURLException e) {
e.printStackTrace();
return new StringBuilder("");
}  

catch (IOException e) {
e.printStackTrace();
return new StringBuilder("");
}
}

public static void main(String arg[]){
System.out.println(readPage("http://www.google.com"));
}
}

This will return me the source code in a String soemthing like :

<!doctype html>.......</body></html>

Is there a way to display this html in something like a JFrame using this source code?

Swing components have very basic support for html, you may switch to JavaFx's WebView — user2575725
– user2575725, Commented Aug 5, 2018 at 7:33

elvirt · Accepted Answer · 2018-08-04 20:29:43Z

2

You can write source code to an file, something like: File file = new File("index.html"); and than open that file with your default browser. Page open can be done with https://docs.oracle.com/javase/7/docs/api/java/awt/Desktop.html.

try {
    Files.write(file.toPath(), content.getBytes());
    Desktop.getDesktop().browse(file.toURI());
} catch (IOException e) {
  // TODO Auto-generated catch block
}

If that is that what you think for :D

answered Aug 4, 2018 at 20:29

elvirt

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Comments

tevemadar · Accepted Answer · 2018-08-04 21:13:40Z

1

You can have a simple browser in Java, if that was the question. There was a JWebPane until Java6, and now there is a WebKit-based engine as part of JavaFX:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class BrowserTest extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        StackPane root = new StackPane();

        WebView view = new WebView();
        WebEngine engine = view.getEngine();
        engine.load("http://www.google.com");
        root.getChildren().add(view);

        Scene scene = new Scene(root, 800, 600);
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) throws Exception {
        Application.launch(args);
    }
}

Example was taken from a gist of GitHub user skrb.
One thing I checked is that WebEngine also has loadContent() method where you can directly feed it with HTML content as a String, so you can write

engine.loadContent(readPage("http://www.google.com").toString());

in place of the current load() call (which takes an URL), just be prepared that the downloaded HTML code is not everything what a webpage needs.

answered Aug 4, 2018 at 21:13

tevemadar

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2 Comments

Jason WEI Over a year ago

hi I have tried your codes and it will work! But however I have added a JFrame class inside my java program, and I want to call this show browser method inside the JFrame, is it possible to do that? Right now i cant use the above codes inside the JFrame as JFrame extends JFrame class and does not allow me to extends Application class anymore!

tevemadar Over a year ago

@JasonWEI I have not tried that, but I think you will need this tutorial: JavaFX for Swing Developers

prasad_ · Accepted Answer · 2018-08-05 07:25:17Z

0

One can open a html page or content within a Swing's JEditorPane. JEditorPane has various constructors including:

JEditorPane(URL initialPage)
JEditorPane(String type, String text) // where type can be a MIME type: text/html

This can be used with simple html content; the limitation is the html version supported is 3.2 only. Optionally, the Swing application can open a JavaFX's WebView within a JFrame using JFXPanel.

answered Aug 5, 2018 at 7:25

prasad_

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