Java Swing-My类扩展了JTextPane，并首先调用My append（），然后调用super.setText（）添加额外的换行符
很简单：我有一个SSCCE：Java Swing-My类扩展了JTextPane，并首先调用My append（），然后调用super.setText（）添加额外的换行符,java,swing,jtextpane,Java,Swing,Jtextpane,很简单：我有一个SSCCE： import java.io.File; import javax.swing.JFrame; import javax.swing.JTextPane; import javax.swing.SwingUtilities; import javax.swing.text.BadLocationException; import javax.swing.text.Document; import javax.swing.text.MutableAttributeS
import java.io.File;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.MutableAttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import net.miginfocom.swing.MigLayout;
public class Test1_ChangeStyleAndAppend extends JFrame {
public class MyJTextPane extends JTextPane {
/**
* Append some text to this pane.
* @param s
*/
public void append(String s) {
try {
Document doc = this.getDocument();
doc.insertString(doc.getLength(), s, null);
} catch(BadLocationException e) {
System.err.println(e);
}
}
/**
* Append some text and change line.
* @param s
*/
public void appendLine(String s) {
try {
Document doc = this.getDocument();
doc.insertString(doc.getLength(), s + System.lineSeparator(), null);
} catch(BadLocationException e) {
System.err.println(e);
}
}
}
public Test1_ChangeStyleAndAppend() {
begin();
}
private void begin() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
MyJTextPane pane0 = new MyJTextPane();
pane0.appendLine("MyJTextPane using append() and then calling setText()");
pane0.appendLine("Second line. ");
pane0.appendLine("Third line");
pane0.setText(pane0.getText() + "At last" + System.lineSeparator());
pane0.setBorder(new EtchedBorder(EtchedBorder.RAISED));
add(pane0, BorderLayout.NORTH);
MyJTextPane pane = new MyJTextPane();
// changeLineSpacing(pane, 1.5f, false);
pane.appendLine("MyJTextPane calling appendLine()");
pane.appendLine("Second line. ");
pane.appendLine("Third line");
pane.appendLine("At last");
pane.setBorder(new EtchedBorder(EtchedBorder.RAISED));
add(pane, BorderLayout.CENTER);
JTextPane pane2 = new JTextPane();
pane2.setText("Normal JTextPane calling setText()");
pane2.setText(pane2.getText() + System.lineSeparator() + "Second line. ");
pane2.setText(pane2.getText() + System.lineSeparator() + "Third line");
pane2.setText(pane2.getText() + System.lineSeparator() + "At last");
pane2.setBorder(new EtchedBorder(EtchedBorder.RAISED));
add(pane2, BorderLayout.SOUTH);
pack();
setVisible(true);
}
/**
* Select all the text of a <code>JTextPane</code> first and then set the line spacing.
* @param pane the <code>JTextPane</code> to apply the change
* @param factor the factor of line spacing. For example, <code>1.0f</code>.
* @param replace whether the new <code>AttributeSet</code> should replace the old set. If set to <code>false</code>, will merge with the old one.
*/
public static void changeLineSpacing(JTextPane pane, float factor, boolean replace) {
pane.selectAll();
MutableAttributeSet set = new SimpleAttributeSet(pane.getParagraphAttributes());
StyleConstants.setLineSpacing(set, factor);
pane.setParagraphAttributes(set, replace);
pane.setCaretPosition(0); //scroll to the top.
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Test1_ChangeStyleAndAppend frame = new Test1_ChangeStyleAndAppend();
}
});
}
}
JTextPaneJTextPaneappend（）appendLine（）getText（）appendLine（）setText（）getText（）\r\r\n\rJTextAreaJTextPaneJTextAreapane.setText（pane.getText+newText）setText（）appendLine（）\rappend（）setText（pane.getText（）+newText）append（）setText（pane.getText（）+newText）\r有人对此进行了说明？Windows的行分隔符为“\r\n” 文档仅对新行字符串使用“\n”
//doc.insertString(doc.getLength(), s + System.lineSeparator(), null);
doc.insertString(doc.getLength(), s + "\n", null);
//doc.insertString(doc.getLength(), s + System.lineSeparator(), null);
doc.insertString(doc.getLength(), s + "\n", null);
编辑：错误报告和存档。仅在Windows中发生。我使用Windows 10 上一个答案之所以被接受，是因为我已经多次接受我的答案，以此来解决我的问题：）是时候向别人表示一些慷慨了，这样我们才能继续互相帮助 ========================================================================= 最后，当我触摸下面的文档时，我认为问题出现了。我猜，这是因为
JTextPane/**
* Returns the text contained in this <code>TextComponent</code>
* in terms of the
* content type of this editor. If an exception is thrown while
* attempting to retrieve the text, <code>null</code> will be returned.
* This is implemented to call <code>JTextComponent.write</code> with
* a <code>StringWriter</code>.
*
* @return the text
* @see #setText
*/
public String getText() {
String txt;
try {
StringWriter buf = new StringWriter();
write(buf);
txt = buf.toString();
} catch (IOException ioe) {
txt = null;
}
return txt;
}
StringWriter\r\nSystem.lineseparator（）我有这个SSCCE:appendLine（）append（）appendLine（）BorderLayoutpane.getText（）StringWriter buf=newstringwriter（）；写入（buf）；txt=buf.toString（）。这里可能就是问题发生的地方。如果我使用此代码获取文本：请尝试{string=pane0.getDocument（）.getText（0，pane0.getDocument（）.getLength（））；}catch（BadLocationException e）{e.printStackTrace（）；}
并将“\n”
更改回系统.lineSeparator（）
，问题消失。错误报告给Oracle并等待。再次感谢。