[英]java - get text from JTextArea by number line
For my case, I want to get text inside JTextArea by number line. 就我而言,我想通过数字行在JTextArea中获取文本。
For eg 例如
name : andy
birth : jakarta, 1 jan 1990
number id : 01011990 01
age : 26
study : Informatics engineering
So, I want to get a text in line 3. 因此,我想在第3行中获取文本。
I think I can use jTextArea.getText(3,jTextArea.getText().length())
, but it doesn't work. 我想我可以使用
jTextArea.getText(3,jTextArea.getText().length())
,但是不起作用。
so, from line 3, i wish get text 因此,我希望从第3行开始
number id : 01011990 01
Simply based on the example from your previous question ... 只是基于上一个问题的示例...
Document doc = textArea.getDocument();
Element root = doc.getDefaultRootElement();
Element element = root.getElement(2);
int start = element.getStartOffset();
int end = element.getEndOffset();
System.out.println(doc.getText(start, end - start));
And the runnable code 和可运行的代码
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.Element;
public class ElementEndOffsetTest {
public JComponent makeUI() {
String str = "name : andy\n"
+ "birth : jakarta, 1 jan 1990\n"
+ "number id : 01011990 01\n"
+ "age : 26\n"
+ "study : Informatics engineering\n";
JTextArea textArea = new JTextArea(str);
textArea.setEditable(false);
JPanel p = new JPanel(new BorderLayout());
p.add(new JScrollPane(textArea));
p.add(new JButton(new AbstractAction("add") {
@Override
public void actionPerformed(ActionEvent e) {
try {
Document doc = textArea.getDocument();
Element root = doc.getDefaultRootElement();
Element element = root.getElement(2);
int start = element.getStartOffset();
int end = element.getEndOffset();
System.out.println(doc.getText(start, end - start));
} catch (BadLocationException ex) {
ex.printStackTrace();
}
}
}), BorderLayout.SOUTH);
return p;
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new ElementEndOffsetTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
Based on your questions, I would, however, recommend you consider using a JTable
instead, it would be easier, see How to Use Tables for more details 但是,根据您的问题,我建议您考虑改用
JTable
,这样会更容易,有关更多详细信息,请参见如何使用表 。
try following 尝试跟随
String[] lines = jTextArea.getText().split("\\n"); String []行= jTextArea.getText()。split(“ \\ n”); String numberId = lines[3];
字符串numberId = lines [3];
or 要么
String numberId = jTextArea.getText().split("\\n")[3]; 字符串numberId = jTextArea.getText()。split(“ \\ n”)[3];
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