JTextArea中获得光标所处的行数，jtextarea行数,JTextArea组件可

JTextArea中获得光标所处的行数，jtextarea行数,JTextArea组件可

JTextArea组件可以设置自动换行，这样的话我们就无法按照正常的getLineCount()方法返回行数。

下面是先把光标位置转换成坐标位置，再计算应该是多少行：

import java.awt.BorderLayout;import java.awt.Rectangle;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.text.BadLocationException;/** * JTextArea中获得光标所处的行数 * @author 五斗米 <如转载请保留作者和出处> * @blog <a href="http://blog.csdn.net/mq612">http://blog.csdn.net/mq612 */public class Test extends JFrame { private static final long serialVersionUID = -2397593626990759111L; private JScrollPane scrollPane = null; private JTextArea text = null; private JButton button = null; public Test() {  super("JTextArea Row Test");  text = new JTextArea(    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");  text.setLineWrap(true);  scrollPane = new JScrollPane(text);  this.getContentPane().add(scrollPane);  button = new JButton("获取光标所处的行数");  button.addActionListener(new ActionListener() {   public void actionPerformed(ActionEvent arg0) {    try {     Rectangle rec = text.modelToView(text.getCaretPosition());     System.out.println(rec.y / rec.height + 1);    } catch (BadLocationException e) {     e.printStackTrace();    }   }  });  this.getContentPane().add(button, BorderLayout.NORTH);  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  this.setSize(300, 200);  this.setVisible(true); } public static void main(String args[]) {  new Test(); }}//该片段来自于http://byrx.net