How to get line-wrapped text from JTextArea into multiple line-seperated Strings

问题

I have a JTextArea with the following properties:

textArea.setWrapStyleWord(true);
textArea.setLineWrap(true);

In the GUI the text is wrapped normally but when I call textArea.getText(); a single line of text is returned with no line separators.

My question is how can I get the text from the text area component 'as it is in the GUI' into a String or an array of strings?

Image Example:

回答1:

You can get width of JTextArea via textArea.size.width, then get font metrics of JTextArea via textArea.getGraphics().getFontMetrics(textArea.getFont()), using FontMetrics you can calculate width of a particular string - fontMetrics.stringWidth("Some string here").

Then you can, for example, add symbols of text one by one until you surpass width of JTextArea - and start a new line when you do.

I.e.

final String fullText = textArea.getText();
final int width = textArea.size.width;
final ArrayList lines = new ArrayList();
final FontMetrics fontMetrics = textArea.getGraphics().getFontMetrics(textArea.getFont());

StringBuilder sb = new StringBuilder(); 
for(final Character c : fullText) {
    sb.append(c);
    if(fontMetrics.stringWidth(sb.toString()) > width) { 
        sb.setLength(sb.length() - 1); 
        lines.add(sb.toString()); 
        sb = new StringBuilder(c.toString()); 
    }
}
lines.add(sb.toString());

回答2:

Read the javadoc - always informative.

int lineCount = textArea.getLineCount();
String[] lines = new String[lineCount];
String text = textArea.getText();
for (int i = 0; i < lineCount; ++i) {
    int offset = textArea.getLineStartOffset(i);
    int offset2 = textArea.getLineEndOffset(i);
    lines[i] = text.substring(offset, offset2);
}

Not sure that this does line wraps.

来源：https://stackoverflow.com/questions/31519473/how-to-get-line-wrapped-text-from-jtextarea-into-multiple-line-seperated-strings

标签

java

swing

jtextarea

word-wrap