Swing DefaultStyledDocument遍历
Swing DefaultStyledDocument traversal
我正在尝试提取已添加到 DefaultStyledDocument 的四个段落。但它的行为并不像我预期的那样。
我做错了什么?我已经在此处添加了完整的代码 - 正如所要求的那样。
import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Element;
public class MainFrame extends JFrame {
JTextPane jTextPane = new JTextPane();
public static void main(String[] args) {
new MainFrame().init();
try {
Thread.sleep(95000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void init() {
JFrame frame = new JFrame();
frame.setSize(1000, 800);
frame.setVisible(true);
jTextPane.setSize(995, 795);
frame.add(jTextPane);
DefaultStyledDocument document = new DefaultStyledDocument();
try {
document.insertString(document.getLength(), "DDDD\n", null);
document.insertString(document.getLength(), "CCCC\n", null);
document.insertString(document.getLength(), "BBBB\n", null);
document.insertString(document.getLength(), "AAAA\n", null);
} catch (BadLocationException e) {
e.printStackTrace();
}
document.dump(System.out);
jTextPane.setDocument(document);
for (int x = 0; x < 20; x += 5) {
Element paraGE = document.getParagraphElement(x);
int startOff = paraGE.getStartOffset();
int endOff = paraGE.getEndOffset();
String s = null;
try {
s = document.getText(startOff, endOff);
} catch (BadLocationException e) {
e.printStackTrace();
}
System.out.println(s);
}
}
}
javax.swing.text.BadLocationException: Invalid location
at javax.swing.text.GapContent.getChars(GapContent.java:189)
at javax.swing.text.GapContent.getString(GapContent.java:167)
at javax.swing.text.AbstractDocument.getText(AbstractDocument.java:770)
at blah.MainFrame.init(MainFrame.java:60)
at blah.MainFrame.main(MainFrame.java:14)
javax.swing.text.BadLocationException: Invalid location
at javax.swing.text.GapContent.getChars(GapContent.java:189)
at javax.swing.text.GapContent.getString(GapContent.java:167)
at javax.swing.text.AbstractDocument.getText(AbstractDocument.java:770)
at blah.MainFrame.init(MainFrame.java:60)
at blah.MainFrame.main(MainFrame.java:14)
null
null
几件事:
for 循环中的变量没有意义。您想一次阅读一行文本,并且事先不知道每行的大小。
getText(...)
方法的参数错误
您可以使用 Document
中的 Element
class 来获取文本行。
未经测试的代码可能类似于:
Element root = textPane.getDocument().getDefaultRootElement();
int lines = root.getElementCount();
for (int i = 0; i < lines; i++)
{
Element line = root.getElement( i );
int start = line.getStartOffset();
int end = line.getEndOffset();
String text = document.getText(start, end - start);
System.out.println(text);
}
我正在尝试提取已添加到 DefaultStyledDocument 的四个段落。但它的行为并不像我预期的那样。
我做错了什么?我已经在此处添加了完整的代码 - 正如所要求的那样。
import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Element;
public class MainFrame extends JFrame {
JTextPane jTextPane = new JTextPane();
public static void main(String[] args) {
new MainFrame().init();
try {
Thread.sleep(95000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private void init() {
JFrame frame = new JFrame();
frame.setSize(1000, 800);
frame.setVisible(true);
jTextPane.setSize(995, 795);
frame.add(jTextPane);
DefaultStyledDocument document = new DefaultStyledDocument();
try {
document.insertString(document.getLength(), "DDDD\n", null);
document.insertString(document.getLength(), "CCCC\n", null);
document.insertString(document.getLength(), "BBBB\n", null);
document.insertString(document.getLength(), "AAAA\n", null);
} catch (BadLocationException e) {
e.printStackTrace();
}
document.dump(System.out);
jTextPane.setDocument(document);
for (int x = 0; x < 20; x += 5) {
Element paraGE = document.getParagraphElement(x);
int startOff = paraGE.getStartOffset();
int endOff = paraGE.getEndOffset();
String s = null;
try {
s = document.getText(startOff, endOff);
} catch (BadLocationException e) {
e.printStackTrace();
}
System.out.println(s);
}
}
}
javax.swing.text.BadLocationException: Invalid location
at javax.swing.text.GapContent.getChars(GapContent.java:189)
at javax.swing.text.GapContent.getString(GapContent.java:167)
at javax.swing.text.AbstractDocument.getText(AbstractDocument.java:770)
at blah.MainFrame.init(MainFrame.java:60)
at blah.MainFrame.main(MainFrame.java:14)
javax.swing.text.BadLocationException: Invalid location
at javax.swing.text.GapContent.getChars(GapContent.java:189)
at javax.swing.text.GapContent.getString(GapContent.java:167)
at javax.swing.text.AbstractDocument.getText(AbstractDocument.java:770)
at blah.MainFrame.init(MainFrame.java:60)
at blah.MainFrame.main(MainFrame.java:14)
null
null
几件事:
for 循环中的变量没有意义。您想一次阅读一行文本,并且事先不知道每行的大小。
getText(...)
方法的参数错误
您可以使用 Document
中的 Element
class 来获取文本行。
未经测试的代码可能类似于:
Element root = textPane.getDocument().getDefaultRootElement();
int lines = root.getElementCount();
for (int i = 0; i < lines; i++)
{
Element line = root.getElement( i );
int start = line.getStartOffset();
int end = line.getEndOffset();
String text = document.getText(start, end - start);
System.out.println(text);
}