JTable深入浅出

1           JTable深入浅出

1.1           使用Array构造JTable表格

 

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.text.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import java.text.*;

import java.beans.*;

import java.awt.BorderLayout;

import java.awt.Rectangle;

import javax.swing.table.DefaultTableModel;

 

public class SimpleTable extends JFrame {

    private DefaultTableModel model;

    public SimpleTable() {

        try {

            String[] colName = {"歌曲名称", "歌手", "是否收藏"};

            Object[][] musicList = { {"心似狂潮", "羽泉", new Boolean(true)}, {"心似狂潮",

                                   "羽泉", new Boolean(false)}

            };

           model = new DefaultTableModel(musicList, colName);

            this.jTable1 = new JTable(musicList, colName);

            jbInit();

        } catch (Exception ex) {

            ex.printStackTrace();

        }

 

    }

 

    private void jbInit() throws Exception {

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        this.setLocale(new java.util.Locale("zh", "CN", ""));

        this.setTitle("测试JTable");

        this.setSize(500, 300);

        this.setLocation(150, 150);

        this.getContentPane().setLayout(borderLayout1);

        jScrollPane1.setBounds(new Rectangle(10, 39, 180, 233));

        jButton1.setBounds(new Rectangle(218, 46, 108, 30));

        jButton1.setText("添加");

        jButton1.addActionListener(new SimpleTable_jButton1_actionAdapter(this));

        this.getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        jPanel1.add(jScrollPane1);

        jPanel1.add(jButton1);

        jScrollPane1.getViewport().add(jTable1);

        jPanel1.setLayout(null);

    }

 

 

    BorderLayout borderLayout1 = new BorderLayout();

    JPanel jPanel1 = new JPanel();

    JTable jTable1;

    JScrollPane jScrollPane1 = new JScrollPane();

    JButton jButton1 = new JButton();

    public static void main(String[] args) {

        SimpleTable st = new SimpleTable();

        st.setVisible(true);

    }

 

    public void jButton1_actionPerformed(ActionEvent e) {

             Object row[]={"朋友", "周华健", new Boolean(false)};

             model.addRow(row);

             model.fireTableDataChanged();

             jTable1.setModel(model);

           

            

    }

 

}

 

 

class SimpleTable_jButton1_actionAdapter implements ActionListener {

    private SimpleTable adaptee;

    SimpleTable_jButton1_actionAdapter(SimpleTable adaptee) {

        this.adaptee = adaptee;

    }

 

    public void actionPerformed(ActionEvent e) {

        adaptee.jButton1_actionPerformed(e);

    }

}

需要注意的地方：

表格由两部份组成:分别是行标题(Column Header)与行对象(Column Object).利用JTable所提供的getTableHeader()方法取得
行标题。在这个例子中，我们将JTable放在JScrollPane中，这种做法可以将Column Header与Colmn Object完整的显示出来,因为
JScrollPane会自动取得Column Header.但如果文坛读者将上面第15行去掉并修改第16行:
f.getContentPane().add(table,BorderLayout.CENTER);
则运行结果你会发现Column Header不见了。

如果你不想用JScrollPane,要解决这个问题，你必须将程序修改如下:

JTable table=new JTable(p,n);
table.setPreferredScrollableViewportSize(new Dimension(550,30));
f.getContentPane().add(table.getTableHeader(),BorderLayout.NORTH);
f.getContentPane().add(table,BorderLayout.CENTER);

 

1.2           使用TableModel构造JTable表格

1.3          利用JTable显示数据库表

1.3.1          利用资源文件封装数据库连接类（使用了单例模式）

ConnManager.java

package com.jtable;

/**

 *

 * <p>Title: HelloWorld之JAVA基础</p>

 *

 * <p>Description: JAVA基础</p>

 *

 * <p>Copyright: Copyright (c) 2007</p>

 *

 * <p>Company: HelloWorld of QYSOFT</p>

 *

 * @author 商延涛

 * @version 1.0

 */

import java.sql.*;

import java.util.*;

public class ConnManager {

    private ConnManager() {

    }

 

    public static void main(String[] args) {

        ConnManager connmanager = new ConnManager();

        String name = connmanager.config.getString("dbUsrName");

        System.out.println("name");

    }

 

    protected static ConnManager instance;

    public static ConnManager getInstanceOf() {

        if (instance == null) {

            return new ConnManager();

        }

        return instance;

    }

 

    public Connection getConnection() {

        try {

            Class.forName(config.getString("dbDriver"));

            return java.sql.DriverManager.getConnection(config.getString(

                    "dbUrl"),

                    config.getString("dbUsrName"),

                    config.getString("dbPassword"));

 

        } catch (ClassNotFoundException ex) {

            ex.printStackTrace();

        } catch (SQLException e) {

            e.printStackTrace();

        }

 

        return null;

    }

 

    private final String path = "com.jtable.dbconfig";

    private ResourceBundle config = java.util.ResourceBundle.getBundle(path,

            java.util.Locale.getDefault());

 

 

}

 

 

1.3.2      连接数据库的DbModel

package com.jtable;

/**

 *

 * <p>Title: HelloWorld之JAVA基础</p>

 *

 * <p>Description: JAVA基础</p>

 *

 * <p>Copyright: Copyright (c) 2007</p>

 *

 * <p>Company: HelloWorld of QYSOFT</p>

 *

 * @author 商延涛

 * @version 1.0

 */

import javax.swing.table.*;

import javax.swing.JTable;

import java.util.*;

import java.sql.*;

public class DbModel extends AbstractTableModel {

    public DbModel(String command) throws SQLException {

        this.command = command;

        conn = ConnManager.getInstanceOf().getConnection();

        statement = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);

        rs = statement.executeQuery(command);

        rsm = rs.getMetaData();

 

    }

 

    public static void main(String[] args) {

 

    }

 

    public int getRowCount() {

        try {

            rs.last();

            return rs.getRow();

        } catch (SQLException ex) {

        }

        return 0;

    }

 

    public int getColumnCount() {

        try {

            return rsm.getColumnCount();

        } catch (SQLException ex) {

            return 0;

        }

    }

 

    public String getColumnName(int c)

    {

        try {

            return rsm.getColumnName(c + 1);

        } catch (SQLException ex) {

            return null;

        }

    }

 

    public Object getValueAt(int row, int column) {

        try {

            rs.absolute(row + 1);

          return rs.getObject(column + 1);

 

        } catch (SQLException ex) {

            return null;

        }

 

    }

 

    public void addRows() throws SQLException {

        if (conn == null || rs == null)

            return;

        rows = new Vector();

        while (rs.next()) {

            Vector v = new Vector();

 

            for (int i = 0; i <= rsm.getColumnCount(); i++) {

                v.add(rs.getString(i + 1));

            }

            rows.add(v);

        }

 

    }

 

    private Vector rows;

    private String command;

    private Connection conn;

    private java.sql.ResultSet rs;

    private java.sql.Statement statement;

    private ResultSetMetaData rsm;

}