Java Swing JTable 简单总结-白红宇

Java Swing JTable 简单总结

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发布时间：2019-06-15

本文共 9376 字，大约阅读时间需要 31 分钟。

一个JTable对应一个有一个TableModel来管理它的数据，Jtable需要放入一个JscrollPane中来正常显示，当然也可以只显示表格内容、或者只显示表头。

final GameListTable gameTable = new GameListTable();GameListTableModel model = new GameListTableModel();gameTable.setModel(model);JScrollPane scrollPane = new JScrollPane(gameTable);gbc.fill = GridBagConstraints.BOTH;gbc.gridx = 0;gbc.gridy = 1;mContainer.add(scrollPane, gbc);

TableModel中管理表格中数据，当编辑表格时，会触发Model中的setValueAt方法，可以在这里触发数据库保存操作，当显示表格数据时，表格会逐行调用getValueAt方法将该方法返回值放入表格中。另外还有一些方法，如getRowCount确定表格显示多少行数据，getColumnName表格表头的名字，isCellEditable如果需要一个单元格无法编辑，则实现该方法，在指定的row和column时返回false。DefaultTableModel中已经实现了大部分的常用方法，例如removeRow和insertRow，其中使用dataVector这个变量保存表格每一行的值，具体可以参看jdk源码。

import java.util.Date;import java.util.List;import java.util.Vector;import javax.swing.table.DefaultTableModel;import com.aquar.game.database.Company;import com.aquar.game.database.EnumGameType;import com.aquar.game.database.Game;import com.aquar.game.dataserver.DataHandler;import com.aquar.game.ulti.Ultility;public class GameListTableModel extends DefaultTableModel {    public static final int COL_NAME = 0;    public static final int COL_TYPE = COL_NAME + 1;    public static final int COL_DATE = COL_TYPE + 1;    public static final int COL_COMPANY = COL_DATE + 1;    public static final int COL_DATA = COL_COMPANY + 1;    // not edit the cell by default    private boolean editable = false;        public GameListTableModel() {        initColNames();    }    @SuppressWarnings({ "rawtypes", "unchecked" })    public void initData(List
     
       gameList) {        dataVector.clear();        if (gameList != null) {            for (Game game : gameList) {                Vector rowVector = new Vector();                rowVector.add(COL_NAME, game.getName());                 rowVector.add(COL_TYPE, game.getType());                rowVector.add(COL_DATE, game.getReleaseDate());                rowVector.add(COL_COMPANY, game.getCompany());                rowVector.add(COL_DATA, game);                                dataVector.add(rowVector);            }        }        fireTableDataChanged();    }    @SuppressWarnings("unchecked")    private void initColNames() {        columnIdentifiers.add("Name");        columnIdentifiers.add("Type");        columnIdentifiers.add("Date");        columnIdentifiers.add("Company");            }        @Override    public int getRowCount() {        return super.getRowCount();    }        @Override    public Object getValueAt(int row, int column) {        Object ret = "";        Vector rowVector = (Vector) dataVector.elementAt(row);        Object data =  rowVector.elementAt(column);        if (data != null) {            if (COL_TYPE == column) {                int type = (int) data;                ret = EnumGameType.getEnum(type);            } else if (COL_DATE == column) {                ret = Ultility.getDateStr((Date) data);            } else {                ret = data;            }        } else {        }                return ret;    }        @Override    public void setValueAt(Object aValue, int row, int column) {        Object oldValue = getValueAt(row, column);        // not change anything.        if (oldValue != null && oldValue.equals(aValue)) {            return ;        }                // Get the Object of line.        Vector rowVector = (Vector) dataVector.elementAt(row);        Game game = (Game) rowVector.elementAt(COL_DATA);        switch (column) {        case COL_NAME:            game.setName(aValue.toString().trim());            break;        case COL_TYPE:            if (aValue instanceof EnumGameType) {                EnumGameType type = (EnumGameType) aValue;                game.setType(type.ordinal());            }            break;        case COL_DATE:            if (aValue instanceof Date) {                game.setReleaseDate((Date) aValue);            }            break;        case COL_COMPANY:            if (aValue instanceof Company) {                Company company = (Company) aValue;                game.setCompany(company);            }            break;        default:            break;        }        DataHandler.getInstance().save(game);    }        @Override    public boolean isCellEditable(int row, int column) {        boolean ret = false;        if (editable) {            if (column == COL_DATE) {            } else {                ret = super.isCellEditable(row, column);            }        } else {        }        return ret;            }        public boolean isEditable() {        return editable;    }    public void setEditable(boolean editable) {        this.editable = editable;    }        public Object getSelectObject(int row) {        Object ret = null;        if (row < dataVector.size()) {            Vector rowVector = (Vector) dataVector.elementAt(row);            ret = rowVector.elementAt(COL_DATA);        }        return ret;    }}

当表格处于编辑状态时，会调用CellEditor来提供编辑入口，通过自定义CellEditor可以设置不同的单元格编辑框的样式，可以是JcomboBox、JtextField、JcheckBox等文本输入控件。可以按照对象类型设置所有某个对象类型的单元格都是一种CellEditor也是按照列来分别设置不同的列使用不同的编辑器。

private void initTable(final GameListTable gameTable) {        EnumGameType[] types = EnumGameType.values();        JComboBox
     
       typeBox = new JComboBox
      
       (types);        gameTable.getColumnModel().getColumn(GameListTableModel.COL_TYPE).setCellEditor(new CustomCellEditor(typeBox));                JComboBox
       
         companyBox = new JComboBox<>();        List
        
          companies = DataCache.getInstance().getComanies();        if (companies != null) {            companyBox.setModel(                    new DefaultComboBoxModel
         
          (                            (Company[]) companies.toArray(new Company[companies.size()])));        }        gameTable.getColumnModel().getColumn(GameListTableModel.COL_COMPANY).setCellEditor(new CustomCellEditor(companyBox));        gameTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);                gameTable.addMouseListener(new MouseAdapter() {            @Override            public void mousePressed(MouseEvent e) {                if (e.getClickCount() == 2) {                    int col = gameTable.columnAtPoint(e.getPoint());                    int row = gameTable.rowAtPoint(e.getPoint());                    if (GameListTableModel.COL_DATE == col) {                        Window parentWindow = SwingUtilities                                .windowForComponent(mContainer);                        DatePickerDialog dialog = new DatePickerDialog(parentWindow);                        dialog.setVisible(true);                        if (dialog.isChanged()) {                            gameTable.setValueAt(dialog.getDateValue().getTime(), row, col);                        }                    }                }                super.mousePressed(e);            }        });    }

TableCellEditor是一个接口，只有一个方法getTableCellEditorComponent，该方法返回的Component将会显示在表格的某一个格子中，供用户编辑输入。一般只需要继承DefaultCellEditor，对已经实现的功能根据特殊需要就行覆盖即可。在实现Combobox时，默认情况下，Combobox不会选择表格的当前值作为选项列表的默认值，需要在方法getTableCellEditorComponent中，将表格的当前值选择上。

import java.awt.Component;import javax.swing.DefaultCellEditor;import javax.swing.JComboBox;import javax.swing.JTable;/** * @author Edison * Custom a TableCellEditor for get right select when edit. */public class CustomCellEditor extends DefaultCellEditor {    public CustomCellEditor(JComboBox comboBox) {        super(comboBox);        // TODO Auto-generated constructor stub    }        @Override    public Component getTableCellEditorComponent(JTable table, Object value,            boolean isSelected, int row, int column) {        // TODO Auto-generated method stub        Component com = super.getTableCellEditorComponent(table, value, isSelected, row, column);        if (com instanceof JComboBox
     ) {            ((JComboBox
     ) com).setSelectedItem(value);            Object obj = ((JComboBox) com).getSelectedItem();            System.out.println(obj);        }        return com;    }}

当表格没有在编辑状态时，表格使用CellRender来显示表格的每一个单元格，同样可以根据数据类型或者列来设置每一列甚至某个单元格的样式。

import javax.swing.JTable;public class GameListTable extends JTable {    public GameListTable() {        // exit edit status when lose focus.        putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);        setDefaultRenderer(Object.class, new CustomCellRender());        setRowHeight(26);    }       }

CellRender一般都是JLabel对象，只需要继承DefaultTableCellRenderer类覆盖其中的getTableCellRendererComponent方法，该方法返回的控件在显示表格时会被调用，因此在其中可以对显示文字样式、背景色进行调整，返回控件即可。

import java.awt.Color;import java.awt.Component;import javax.swing.JTable;import javax.swing.table.DefaultTableCellRenderer;public class CustomCellRender extends DefaultTableCellRenderer {    private Color oddLineColor = new Color(45, 210, 150);    private Color evenLineColor = new Color(210, 150, 40);    @Override    public Component getTableCellRendererComponent(JTable table, Object value,            boolean isSelected, boolean hasFocus, int row, int column) {        // TODO Auto-generated method stub        Component com =  super.getTableCellRendererComponent(table, value, isSelected, hasFocus,                row, column);        if (row % 2 == 0) {            com.setBackground(oddLineColor);        } else {            com.setBackground(evenLineColor);        }        return com;    }}

一个简单Swing数据库程序例子

转载于:https://www.cnblogs.com/aquar/p/3505194.html

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