为什么JTextPane中的超链接（标签）停留在中心（中心位置）
我已经实现了两种方法，以便在 JTextPane 中添加文本和超链接。问题在于，超链接显示为居中对齐，但不显示文本（我希望两者都保持左对齐）。
方法是：
public void addText (String log, Color c, boolean bold) {
StyledDocument doc = jTextPane.getStyledDocument();
SimpleAttributeSet attrs = new SimpleAttributeSet();
StyleConstants.setFontFamily(attrs, "Calibri");
StyleConstants.setFontSize(attrs, 13);
StyleConstants.setForeground(attrs, c);
StyleConstants.setBold(attrs, bold);
try {
doc.insertString(doc.getLength(), log, attrs);
} catch (BadLocationException ex) {
Logger.getLogger(FrameLog.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void addHyperlink (URL url, String text) {
StyledDocument doc = jTextPane.getStyledDocument();
SimpleAttributeSet hrefAttr = new SimpleAttributeSet();
hrefAttr.addAttribute(HTML.Attribute.HREF, url.toString());
SimpleAttributeSet attrs = new SimpleAttributeSet();
attrs.addAttribute(HTML.Tag.A, hrefAttr);
StyleConstants.setFontFamily(attrs, "Calibri");
StyleConstants.setFontSize(attrs, 13);
StyleConstants.setForeground(attrs, Color.blue);
try {
doc.insertString(doc.getLength(), text, attrs);
} catch (BadLocationException e) {
e.printStackTrace(System.err);
}
}
结果是这样的：
![the problem[1]](https://i.stack.imgur.com/SbZko.jpg)
完整问题演示代码段HERE。
有人知道我该如何解决此问题？
2 个答案:
答案 0 :(得分：1)
出于价值，我尝试处理文档中的HTML文本时会遇到一些旧的（难看的）代码。
我使用了insertString(...)以外的方法。也许这会给您一些想法？
import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
public class TextPaneHTML extends JFrame implements ActionListener
{
JTextPane textPane;
HTMLEditorKit editorKit;
HTMLDocument doc;
Element root;
public TextPaneHTML()
{
textPane = new JTextPane();
// textPane.setEditable( false );
textPane.setContentType( "text/html" );
textPane.setEditable(false);
editorKit = (HTMLEditorKit)textPane.getEditorKit();
doc = (HTMLDocument)textPane.getDocument();
root = doc.getDefaultRootElement();
DefaultCaret caret = (DefaultCaret)textPane.getCaret();
caret.setUpdatePolicy(DefaultCaret.NEVER_UPDATE);
textPane.setText( "<html><body>Hello world I want some long text <a href=\"http://answers.polldaddy.com/poll/1742928/\">Do you like polls</a> to it wraps to a new line World!</body></html>" );
// textPane.setCaretPosition(7);
// textPane.setText( "" );
// printInfo();
// Add text pane to frame
JScrollPane scrollPane = new JScrollPane( textPane );
scrollPane.setPreferredSize( new Dimension( 200, 200 ) );
getContentPane().add( scrollPane );
// Add a append button
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout( new GridLayout(1, 0) );
getContentPane().add( buttonPanel, BorderLayout.SOUTH );
createButton("Normal", buttonPanel);
createButton("Styled", buttonPanel);
createButton("B1", buttonPanel);
createButton("B2", buttonPanel);
createButton("B3", buttonPanel);
try
{
HTMLDocument.Iterator it = doc.getIterator(HTML.Tag.A);
while (it.isValid())
{
SimpleAttributeSet s = (SimpleAttributeSet)it.getAttributes();
System.out.println(s);
s.removeAttribute(HTML.Attribute.HREF);
System.out.println( s.getClass().getName());
String href = (String)s.getAttribute(HTML.Attribute.HREF);
int start = it.getStartOffset();
int end = it.getEndOffset();
String text = doc.getText(start, end - start);
System.out.println( href + " : " + text );
it.next();
}
}
catch(Exception e) {};
}
public void createButton(String text, JPanel panel)
{
JButton button = new JButton(text);
button.addActionListener( this );
panel.add( button );
}
public void actionPerformed(ActionEvent ae)
{
String command = ae.getActionCommand();
String text;
try
{
if ("Normal".equals( command ))
{
text = "normal text";
editorKit.insertHTML(doc, doc.getLength(), text, 0, 0, null);
}
if ("Styled".equals( command ))
{
// text = "<font size=5 color=red>font and color test</font>";
text = "<a href=\"abc\">hyperlink</a>";
editorKit.insertHTML(doc, doc.getLength(), text, 0, 0, null);
// doc.insertString(doc.getLength(), text, null);
// try {
// editorKit.read(new StringReader(text), doc, doc.getLength());
// } catch (Exception e) {
// e.printStackTrace();
// }
}
if ("B1".equals( command ))
{
// text = "<br>B1";
text = "<a href=\"abc\">hyperlink</a>";
Element element = root.getElement(1);
doc.insertBeforeEnd(element, text);
}
if ("B2".equals( command ))
{
Element element = root.getElement(1);
text = "<br>B2-after start";
doc.insertAfterStart(element, text);
// why doesn't this work
text = "<br>B2-before end";
doc.insertBeforeEnd(element, text);
}
if ("B3".equals( command ))
{
// text = "<p>B3</p>";
// editorKit.insertHTML(doc, textPane.getCaretPosition(), text, 0, 0, HTML.Tag.P);
text = "<a href=\"abc\">hyperlink</a>";
editorKit.insertHTML(doc, textPane.getCaretPosition(), text, 0, 0, HTML.Tag.A);
// doc.insertString(doc.getLength(), text, null);
}
}
catch(Exception e)
{
// BadLocationException ble = (BadLocationException)e;
// System.out.println(e + " : " + ble.offsetRequested());
System.out.println(e);
}
// System.out.println( command + ": -----------" );
// System.out.println( "Elements: " + root.getElementCount() );
// System.out.println( root.getElement(0).getAttributes() );
// System.out.println( root.getElement(1).getAttributes() );
try
{
System.out.println( "textPane: " + textPane.getText() );
System.out.println( "Document: " + textPane.getDocument().getText(0, textPane.getDocument().getLength()) );
}
catch(Exception e2) {}
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
TextPaneHTML frame = new TextPaneHTML();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setSize(50, 120);
frame.setVisible(true);
}
});
}
}
答案 1 :(得分：1)
感谢camickr's answer，我设法使用HTMLEditorKit类来找到解决方案：）
我用一个泛型替换了以前的方法，该泛型将一些html代码附加到JTextPane中。
新方法是：
public void appendTextPane (String html) {
HTMLEditorKit editor = (HTMLEditorKit) jTextPane.getEditorKit();
HTMLDocument doc = (HTMLDocument) jTextPane.getDocument();
String TAG;
if (html.charAt(0) != '<') {
TAG = "";
} else {
int nextSpaceIdx = html.indexOf(" ");
int nextBrcktIdx = html.indexOf(">");
TAG = html.substring(1, nextBrcktIdx < nextSpaceIdx ? nextBrcktIdx : nextSpaceIdx);
}
// System.out.println(jTextPane.getText());
try {
editor.insertHTML(doc, doc.getLength(), html.replaceAll(" ", " "), 0, 0, HTML.getTag(TAG));
} catch (IOException | BadLocationException ex) {
}
}
固定的预览是这样的：
完整的解决方案演示代码段：
import java.awt.*;
import java.io.IOException;
import java.net.URISyntaxException;
import javax.swing.*;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;
import javax.swing.text.*;
import javax.swing.text.html.HTML;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
public class SolutionDemo {
private JFrame jFrame;
private JTextPane jTextPane;
private JScrollPane jScrollPane;
public SolutionDemo () {
//CREATE THE COMPONENTS AND SHOW THE FRAME WINDOW
jFrame = new JFrame();
jTextPane = new JTextPane();
jScrollPane = new JScrollPane(jTextPane);
jScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
jScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
jFrame.setLayout(new FlowLayout());
//I NEED IT TO BE HTML SO THE HYPERLINK TO BE CLICKABLE
jTextPane.setContentType("text/html");
jTextPane.setEditable(false);
jTextPane.setPreferredSize(new Dimension(600, 100));
jFrame.add(jScrollPane);
jFrame.pack();
jFrame.setVisible(true);
jFrame.setLocationRelativeTo(null);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//ADD LISTENER IN ORDER TO OPEN THE LINK ON BROWSER WHEN CLICKED
jTextPane.addHyperlinkListener(new HyperlinkListener() {
public void hyperlinkUpdate (HyperlinkEvent evt) {
if (evt.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
if (Desktop.isDesktopSupported()) {
try {
Desktop.getDesktop().browse(evt.getURL().toURI());
} catch (IOException | URISyntaxException ex) {
ex.printStackTrace();
}
}
}
}
});
}
public void init () {
//SET GLOBAL STYLES
jTextPane.setText(""
+ "<head>"
+ " <style type=\"text/css\">"
+ " body{ "
+ " color: green;"
+ " font-family: calibri"
+ " }"
+ " </style>"
+ "</head>");
//ADD SOME TEXT AND HYPERLINKS
String url = "https://www.example.com";
appendTextPane("No tag must be inserted first in order to custom header work with this impl ");
appendTextPane("<span>BLAH blah BLAH blah BLAH blah BLAH blah </span>");
appendTextPane("<span style=\"color:red\">BLAH blah BLAH blah BLAH blah BLAH blah </span>");
appendTextPane("<a href=\"" + url + "\">" + url + "</a>");
appendTextPane("<span> BLAH blah BLAH blah BLAH blah BLAH blah <a href=\"" + url + "\">" + url + "</a></span>");
appendTextPane("With no tag the text goes to next line <a href=\"" + url + "\">" + url + "</a>");
}
public void appendTextPane (String html) {
HTMLEditorKit editor = (HTMLEditorKit) jTextPane.getEditorKit();
HTMLDocument doc = (HTMLDocument) jTextPane.getDocument();
String TAG;
if (html.charAt(0) != '<') {
TAG = "";
} else {
int nextSpaceIdx = html.indexOf(" ");
int nextBrcktIdx = html.indexOf(">");
TAG = html.substring(1, nextBrcktIdx < nextSpaceIdx ? nextBrcktIdx : nextSpaceIdx);
}
// System.out.println(jTextPane.getText());
try {
//REPLACE SPACES WITH ITS NUMERIC ENTITY REFERENCE IN ORDER TO SHOW ALL THE EXISTING SPACES
editor.insertHTML(doc, doc.getLength(), html.replaceAll(" ", " "), 0, 0, HTML.getTag(TAG));
} catch (IOException | BadLocationException ex) {
}
}
public static void main (String[] args) {
new SolutionDemo().init();
}
}
谢谢camickr！ 不幸的是，由于缺乏声誉，我无法接受您的回答。
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