Swing, Jtable

1. Swing

• JFC(Java Foundation Class Library) 라고 명시한다
• Awt처럼 프레임을 생성하고 이벤트를 지정한다
• Awt보다 컴포넌트의 기능이 많다
• Awt
  • 시스템 os의 자원을 그대로 이용
  • 단일 Panel로 구성
• Swing
  • 컴포넌트를 자바로 구현
  • 다중 패널로 구성
    • 컴포넌트가 적재되는 패널이 계층별로 여러 개 존재한다

package com.swing.day1;

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;

public class SwingTest extends JFrame implements ActionListener {
    JButton bt1, bt2, bt3, bt4;


    public SwingTest() {
        super("Swing 예제");
        init();
        addEvent();
    }

    private void addEvent() {
        bt1.addActionListener(this);
        bt2.addActionListener(this);
        bt3.addActionListener(this);
        bt4.addActionListener(this);

    }

    private void init() {
        setSize(700,250);
        setLayout(new GridLayout(1,0));
        bt1=new JButton("버튼");

        ImageIcon icon1 = new ImageIcon("img/open.jpg"); //프로젝트폴더\img폴더\open.jpg
        ImageIcon icon2 = new ImageIcon("img/input.jpg");
        ImageIcon icon3 = new ImageIcon("img/confirm.jpg");

        bt2 = new JButton("OPEN",icon1);
        bt3 = new JButton("INPUT",icon2);
        bt4 = new JButton("CONFIRM",icon3);

        this.add(bt1);
        this.add(bt2);
        this.add(bt3);
        this.add(bt4);

        bt2.setVerticalTextPosition(JButton.BOTTOM);
        bt2.setHorizontalTextPosition(JButton.CENTER);

        bt3.setVerticalTextPosition(JButton.TOP);
        bt3.setHorizontalTextPosition(JButton.CENTER);
        bt3.setToolTipText("풍선 도움말");

        ImageIcon icon4 = new ImageIcon("img/exit.jpg");
        bt4.setPressedIcon(icon4); //누른상태시 아이콘
        bt4.setMnemonic('C'); // 단축키 alt+c

        //각 버튼에 보더 추가
        bt1.setBorder(new LineBorder(Color.green,5));
        bt2.setBorder(new TitledBorder("테두리에 제목 주기"));
        bt3.setBorder(new BevelBorder(BevelBorder.LOWERED));
        bt4.setBorder(new EtchedBorder());


        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //창닫기 처리


    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==bt1) {
            //void showMessageDialog(Component parentComponent, Object message
            JOptionPane.showMessageDialog(this, "환영합니다");
        }
        else if(e.getSource()==bt2) {
            //void showMessageDialog(Component parentComponent, Object message, String title, int messageType)
            JOptionPane.showMessageDialog(this, "누르지마세요","경고",JOptionPane.WARNING_MESSAGE);
        }
        else if(e.getSource()==bt3) {
            //String showInputDialog(Component parentComponent, Object message)
            String name = JOptionPane.showInputDialog(this,"이름을 입력하세요");
            setTitle(name);
        }
        else if(e.getSource()==bt4) {
            //int showConfirmDialog(Component parentComponent, Object message, String title, int optionType)
            int quit = JOptionPane.showConfirmDialog(this, "종료하시겠습니까?","종료",JOptionPane.YES_NO_OPTION);
            setTitle("quit = "+quit);
            if(quit == JOptionPane.YES_OPTION) {
                System.exit(0);
            }
        }

    }

    public static void main(String[] args) {
        SwingTest f = new SwingTest();
        f.setVisible(true);

    }

}

---

2. Swing의 JTable

• Jtable
  • JTable(Object[][] rowData, Object[] columnNames)

package com.swing.day1;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class TableTest extends JFrame {
    JScrollPane scrollPane;
    JTable table; //view
    String data[][] = {
            {"1","홍길동","서울"},
            {"2","김길동","경기"},
            {"3","이길동","인천"},
            {"4","박길동","대전"},
    }; //model

    String[] colNames = {"번호","이름","주소"};


    public TableTest() {
        super("Table Test");
        //JTable(Object[][] rowData, Object[] columnNames)
        table = new JTable(data, colNames);
        scrollPane = new JScrollPane(table);
        add(scrollPane);

        setSize(300,300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        TableTest f = new TableTest();
        f.setVisible(true);

    }

}

• 테이블은 사실 상 뷰
• 테이블에 직접 데이터를 넣지 않고 모델과 분리
• DefaultTableModel model = new DefaultTableModel();

package com.swing.day1;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class TableTest2 extends JFrame{
    JScrollPane scrollPane;
    JTable table;
    DefaultTableModel model = new DefaultTableModel();
    String data[][] = {
            {"1","홍길동","서울"},
            {"2","김길동","경기"},
            {"3","이길동","인천"},
            {"4","박길동","대전"},
    };

    String[] colNames = {"번호","이름","주소"};

    public TableTest2() {
        table = new JTable();
        scrollPane = new JScrollPane(table);

        //setDataVector(Object[][] dataVector, Object[] columnIdentifiers)
        model.setDataVector(data, colNames);
        table.setModel(model);

        add(scrollPane);

        setSize(300,300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        TableTest2 f = new TableTest2();
        f.setVisible(true);

    }

}

---

JTable의 데이터베이스 연결

package com.swing.day1;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;


public class TableTest3 extends JFrame {
    JTable table;
    JScrollPane scrollPane;
    JButton bt;
    DefaultTableModel model = new DefaultTableModel();


    public TableTest3(){
        super("table");

        bt = new JButton("조회");
        table = new JTable();
        scrollPane = new JScrollPane();

        model.addColumn("번호");
        model.addColumn("상품명");
        model.addColumn("가격");
        model.addColumn("등록일");

        table.setModel(model);
        table.getTableHeader().setBackground(Color.black);
        table.getTableHeader().setForeground(Color.yellow);
        table.getTableHeader().setReorderingAllowed(false);
        table.setRowHeight(20);

        scrollPane.setViewportView(table);
        this.add(scrollPane,"Center");
        this.add(bt,"North");

        setSize(400,500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        bt.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    showData();
                } catch (SQLException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }

        });

    }
    private void showData() throws SQLException {
        PdDAO dao = new PdDAO();
        List<PdDTO> list = dao.selectAll();

        String[] colNames = {"번호","상품명","가격","등록일"};
        String[][] data = new String[list.size()][4];

        for(int i = 0; i<data.length; i++) {
            PdDTO dto = list.get(i);
            data[i][0] = dto.getNo()+"";
            data[i][1] = dto.getPdName()+"";
            data[i][2] = dto.getPrice()+"";
            data[i][3] = dto.getRegdate()+"";
        }

        model.setDataVector(data, colNames);
        table.setModel(model);

    }

    public static void main(String[] args) {
        TableTest3 f = new TableTest3();
        f.setVisible(true);

    }

}