JavaFX写的简易Rss阅读器

受http://www.oreillynet.com/onjava/blog/2007/05/javafx_first_steps_hello_onjav_1.html这篇文章的启发，加上想学习一下JavaFX，就在上面那篇文章的基础上，做了一个简易的RSS阅读器，其界面类似于Adobe Flex 2的一个demo：进入http://try.flex.org/index.cfm，找到Blog Reader的demo。

读取RSS feed并没有什么问题，使用rome：

java 代码

package rssreader;

import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

public class RssReader {
    private URL url;
    private Integer titleLength = 50;

    public RssReader() {

    }

    public SyndEntry[] load(String urlString) throws IllegalArgumentException, FeedException, IOException {
        if (urlString != null && urlString != "") {
            try {
                url = new URL(urlString);
            } catch (MalformedURLException e) {
                e.printStackTrace();
                return null;
            }
        }
        if (url == null) {
            return null;
        }
        SyndFeedInput input = new SyndFeedInput();
        SyndFeed feed = input.build(new XmlReader(url));
        SyndEntry[] entries = (SyndEntry[]) feed.getEntries().toArray(new SyndEntry[0]);

        for( SyndEntry entry : entries ) {
            entry.setTitle( entry.getTitle().length() > titleLength ? entry.getTitle().substring(0, titleLength - 3 ) + "..." : entry.getTitle() );
        }

        return entries;
    }


}

使用JavaFX构建UI：

JavaFX代码

package rssreader;

import javafx.ui.*;
import javafx.ui.canvas.*;
import javax.swing.JComponent;
import com.sun.syndication.feed.synd.SyndEntry;

var reader:RssReader = READER;

class RssReaderModel {
    attribute rssUrl: String;
    attribute rssEntries: SyndEntry*;
    attribute rssContent: String?;
    attribute rssSelectedIndex: Integer;
}

var model = RssReaderModel {
    rssUrl: "http://woodstudio.iteye.com/blog/rss_blog/alexcheng",
};


var panel = GroupPanel {
     var row1 = Row {}
     var row2 = Row {}
     var col = Column {}
     rows: [row1, row2]
     columns: col
     content:
         [
            GroupPanel  {
                row: row1
                column: col
                var row = Row {}
                var labelCol =  new Column
                var urlCol =  new Column
                var butCol =  new Column
                rows: row
                columns: [labelCol, urlCol, butCol]
                content:
                [
                    SimpleLabel {
                        row: row
                        column: labelCol
                        text: "RSS URL:"
                    },
                     TextField {
                        row: row
                        column: urlCol
                        columns: 60
                        value: bind model.rssUrl
                    },
                    Button {
                        row: row
                        column: butCol
                        text: "Get Entries"
                        action: operation() {
                            model.rssEntries = reader.load(model.rssUrl);
                        }
                    }
                ]
            },
            SplitPane   {
                row: row2
                column: col
                orientation: HORIZONTAL
                content:
                [
                    SplitView  {
                        weight: 0.3
                        content:
                            Table {
                                    columns:
                                    [
                                        TableColumn {
                                            text: "Title"
                                        },
                                        TableColumn {
                                            text: "Date"
                                        },
                                    ]
                                    cells : bind foreach (entry in model.rssEntries)
                                            [
                                                TableCell {
                                                    text: bind entry.title
                                                },
                                                TableCell {
                                                    text: bind entry.publishedDate.toLocaleString()
                                                }
                                            ]
                                    selection: bind model.rssSelectedIndex
                                }
                    },
                    SplitView  {
                        weight: 0.7
                        content:
                            EditorPane   {
                                opaque: true
                                contentType: HTML
                                editable: false
                                text: bind model.rssContent
                            }
                        }
                ]
            }
         ]
};

trigger on (RssReaderModel.rssSelectedIndex = value) {
    var desc = rssEntries[value].description.value;
    rssContent = "<html><body> {desc} </body></html>";
}

MY_CONTAINER:JComponent.add(panel.getComponent());

接着就是使用JSR223的scripting framework来执行：

java 代码

package rssreader;

import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.SimpleScriptContext;
import javax.swing.JFrame;

public class Main {

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        RssReader reader = new RssReader();

        JFrame frame = new JFrame(
                "RSS Reader implemented using JavaFX by alexcheng");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 600);

        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        ScriptEngineManager manager = new ScriptEngineManager(loader);
        ScriptEngine engine = manager.getEngineByExtension("fx");

        Bindings bindings = engine.createBindings();
        bindings.put("READER:rssreader.RssReader", reader);

        bindings.put("MY_CONTAINER:javax.swing.JComponent", frame
                .getContentPane());

        ScriptContext context = new SimpleScriptContext();
        context.setBindings(bindings, ScriptContext.GLOBAL_SCOPE);
        context.setBindings(bindings, ScriptContext.ENGINE_SCOPE);
        engine.setContext(context);

        String script = "import rssreader.FxMain;";
        engine.eval(script);

        frame.setVisible(true);
    }

}

最后的界面如下：