자바 UI - Swing (채팅창 텍스트 입력 후 내용을 엔터키 누르고 전송)

 

채팅창을 흉내내어 입력한 내용을 엔터키 누르고 전송하면 JTextArea에 출력

 

채팅을 치고 엔터키를 누르면 전송하는 방법

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;


public class JTextAreaExample extends JFrame {
	private JTextArea txtDisplay;
	private JPanel pSouth;
	private JTextField txtInput;
	private JButton btnSend;
	
	public JTextAreaExample() {
		this.setTitle("JTextAreaExample");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.getContentPane().add(new JScrollPane(getTxtDisplay()), BorderLayout.CENTER);
		this.getContentPane().add(getPSouth(),BorderLayout.SOUTH);
		this.setSize(300, 200);
	}
	// JTextArea 생성
	public JTextArea getTxtDisplay() {
		if(txtDisplay == null) {
			txtDisplay = new JTextArea();
			txtDisplay.setEditable(false);
		}
		return txtDisplay;
	}
	
	// 남쪽에 부착할 JPanel 생성
	public JPanel getPSouth() {
		if(pSouth == null) {
			pSouth = new JPanel();
			pSouth.setLayout(new BorderLayout());
			pSouth.add(getTxtInput(), BorderLayout.CENTER);
			pSouth.add(getBtnSend(), BorderLayout.EAST);
		}
		return pSouth;
	}
	
	//JTextField 생성
	public JTextField getTxtInput() {
		if (txtInput == null) {
			txtInput = new JTextField();
			txtInput.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					getTxtDisplay().append(getTxtInput().getText() + "\n");
					getTxtInput().setText("");
				}
			});			
		}
		return txtInput;
	}

	//JButton 생성
	public JButton getBtnSend() {
		if (btnSend == null) {
			btnSend = new JButton();
			btnSend.setText("전송");
			btnSend.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					getTxtDisplay().append(getTxtInput().getText() + "\n");
					getTxtInput().setText("");
				}
			});
		}
		return btnSend;
	}
	
	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				JTextAreaExample jFrame = new JTextAreaExample();
				jFrame.setVisible(true);
			}
		});
	}
}

- 실행 결과 -