java-通过数字行从JTextArea获取文本
对于我的例子,我想通过数字行获取JTextArea内的文本 例如java-通过数字行从JTextArea获取文本,java,swing,jtextarea,line-numbers,Java,Swing,Jtextarea,Line Numbers,对于我的例子,我想通过数字行获取JTextArea内的文本 例如 name : andy birth : jakarta, 1 jan 1990 number id : 01011990 01 age : 26 study : Informatics engineering 所以,我想在第3行得到一个文本 我想我可以使用jTextArea.getText(3,jTextArea.getText().length()), 但它不起作用 所以,从第3行,我希望得到文本 number id : 01
name : andy
birth : jakarta, 1 jan 1990
number id : 01011990 01
age : 26
study : Informatics engineering
所以,我想在第3行得到一个文本
我想我可以使用jTextArea.getText(3,jTextArea.getText().length())
,
但它不起作用
所以,从第3行,我希望得到文本
number id : 01011990 01
试着跟随
String[]line=jTextArea.getText().split(“\n”);
字符串numberId=行[3]
或
字符串numberId=jTextArea.getText().split(“\n”)[3] 仅根据您的 以及可运行的代码
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);
});
}
}
根据你的问题,我建议你考虑使用<代码> JTab< >代码>,这会更容易,请参阅更多细节
好的,所以基于你,你知道如何在给定的行插入文本,这给了你起点。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);
});
}
}