corejava第10版

corejava第10版/v2ch03/write/XMLWriteFrame.java

@@ -0,0 +1,107 @@
+package write;
+
+import java.io.*;
+import java.nio.file.*;
+
+import javax.swing.*;
+import javax.xml.stream.*;
+import javax.xml.transform.*;
+import javax.xml.transform.dom.*;
+import javax.xml.transform.stream.*;
+
+import org.w3c.dom.*;
+
+/**
+ * A frame with a component for showing a modern drawing.
+ */
+public class XMLWriteFrame extends JFrame
+{
+   private RectangleComponent comp;
+   private JFileChooser chooser;
+
+   public XMLWriteFrame()
+   {
+      chooser = new JFileChooser();
+
+      // add component to frame
+
+      comp = new RectangleComponent();
+      add(comp);
+
+      // set up menu bar
+
+      JMenuBar menuBar = new JMenuBar();
+      setJMenuBar(menuBar);
+
+      JMenu menu = new JMenu("File");
+      menuBar.add(menu);
+
+      JMenuItem newItem = new JMenuItem("New");
+      menu.add(newItem);
+      newItem.addActionListener(event -> comp.newDrawing());
+      
+      JMenuItem saveItem = new JMenuItem("Save with DOM/XSLT");
+      menu.add(saveItem);
+      saveItem.addActionListener(event -> saveDocument()); 
+
+      JMenuItem saveStAXItem = new JMenuItem("Save with StAX");
+      menu.add(saveStAXItem);
+      saveStAXItem.addActionListener(event -> saveStAX());
+      
+      JMenuItem exitItem = new JMenuItem("Exit");
+      menu.add(exitItem);
+      exitItem.addActionListener(event -> System.exit(0));
+      pack();
+   }
+
+   /**
+    * Saves the drawing in SVG format, using DOM/XSLT
+    */
+   public void saveDocument() 
+   {
+      try 
+      {
+         if (chooser.showSaveDialog(this) != JFileChooser.APPROVE_OPTION) return;
+         File file = chooser.getSelectedFile();
+         Document doc = comp.buildDocument();
+         Transformer t = TransformerFactory.newInstance().newTransformer();
+         t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,
+               "http://www.w3.org/TR/2000/CR-SVG-20000802/DTD/svg-20000802.dtd");
+         t.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "-//W3C//DTD SVG 20000802//EN");
+         t.setOutputProperty(OutputKeys.INDENT, "yes");
+         t.setOutputProperty(OutputKeys.METHOD, "xml");
+         t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
+         t.transform(new DOMSource(doc), new StreamResult(Files.newOutputStream(file.toPath())));
+      }
+      catch (TransformerException | IOException ex) 
+      { 
+         ex.printStackTrace();
+      }      
+   }
+   
+   /**
+    * Saves the drawing in SVG format, using StAX
+    */
+   public void saveStAX()
+   {
+      if (chooser.showSaveDialog(this) != JFileChooser.APPROVE_OPTION) return;
+      File file = chooser.getSelectedFile();
+      XMLOutputFactory factory = XMLOutputFactory.newInstance();
+      try
+      {
+         XMLStreamWriter writer = factory.createXMLStreamWriter(Files.newOutputStream(file.toPath()));
+         try
+         {
+            comp.writeDocument(writer);
+         }
+         finally
+         {
+            writer.close(); // Not autocloseable
+         }
+      }         
+      catch (XMLStreamException | IOException ex) 
+      { 
+         ex.printStackTrace();
+      }      
+   }
+}