Question

我的应用程序中有一个JTable，它有100多行，一个接一个地动态添加。

它存储有关订购了某些东西的客户的数据，并且白天订单越多，所有订单就越多。当我们有100多个订单的忙碌的一天时，JTable在滚动时变得非常慢。

我使用自定义渲染器来更改几个单元格的背景颜色。我尝试使用TableModelEvent只改变可见行的颜色。

这样做会使速度提高一点但仍不足以平滑滚动。有什么选择我必须尝试优化我的JTable，它有/将拥有大量数据？

编辑：如果需要，我可以提供我的Jtable和CustomCellRenderer。

private static class CustomRenderer extends DefaultTableCellRenderer {

        private static final long serialVersionUID = -5699527287605065L;

        public CustomRenderer() {
            setHorizontalAlignment(SwingConstants.CENTER);
        }

        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
                int row, int column) {
            Component cellComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row,
                    column);
            vis.set(row, column);
            if (vis.isVisible(table)) {
                Object o = table.getValueAt(row, column);

                if (column != 1 && column != 5 && column != 10 && !isSelected) {
                    cellComponent.setBackground(Color.WHITE);
                    if ((row % 2) == 0) cellComponent.setBackground(Colors.gray);
                }

                if (o != null) {
                    if (o.toString().contains("Liqui") && !isSelected) {
                        cellComponent.setBackground(Colors.green);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (o.toString().contains("Green Alert") && !isSelected) {
                        cellComponent.setBackground(Colors.yellow);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (o.toString().contains("Red Alert") && !isSelected) {
                        cellComponent.setBackground(Colors.red);
                        cellComponent.setForeground(Color.WHITE);
                    } else if (column == 10 && o.toString().contains("Finalizado")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.green);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (column == 10 && o.toString().contains("Cancelado")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.red);
                        cellComponent.setForeground(Color.WHITE);
                    } else if (column == 10
                            && o.toString().contains("Comprovante em analise")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.yellow);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (column == 10 && o.toString().contains("Aguardando retirada")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.ltOrange);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (column == 10 && o.toString().contains("Entrega agendada")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.orange);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (column == 1
                            && o.toString().toLowerCase().contains("test1")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.test1);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (column == 1 && o.toString().contains("test2")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.test2);
                        cellComponent.setForeground(Color.WHITE);
                    } else if (column == 1 && o.toString().contains("test3")
                            && !isSelected) {
                        cellComponent.setBackground(Colors.test3);
                        cellComponent.setForeground(Color.WHITE);
                    } else if (!isSelected && (row % 2) == 0) {
                        cellComponent.setBackground(Colors.gray);
                        cellComponent.setForeground(Color.BLACK);
                    } else if (!isSelected) {
                        cellComponent.setBackground(Color.WHITE);
                        cellComponent.setForeground(Color.BLACK);
                    }

                    if (Lists.op_list != null) {
                        for (int i = 0; i < Lists.op_list.size(); i++) {
                            if (column == 8 && !isSelected) {
                                if (table.getValueAt(row, 8) != null && table.getValueAt(row, 7) != null) {
                                    if (Lists.op_list.get(i).getFornIDSent() == 1
                                            && (int) table.getValueAt(row, 7) == Lists.op_list.get(i)
                                                    .getOperationID()) {
                                        cellComponent.setBackground(Colors.green);
                                    } else if (Lists.op_list.get(i).getFornIDSent() == 2
                                            && (int) table.getValueAt(row, 7) == Lists.op_list.get(i)
                                                    .getOperationID()) {
                                        cellComponent.setBackground(Colors.yellow);
                                    } else if ((int) table.getValueAt(row, 7) == Lists.op_list.get(i)
                                            .getOperationID()) {
                                        cellComponent.setBackground(Color.WHITE);
                                        if ((row % 2) == 0) cellComponent.setBackground(Colors.gray);
                                    }
                                }
                            }

                            if (table.getValueAt(row, 10).toString().contains("Comprovante em analise") && column == 10
                                    && !isSelected) {
                                if (Lists.op_list.get(i).getSituation() == 1
                                        && (int) table.getValueAt(row, 7) == Lists.op_list.get(i).getOperationID()) {
                                    cellComponent.setBackground(Colors.green);
                                    cellComponent.setForeground(Color.BLACK);
                                } else if (Lists.op_list.get(i).getComprovanteAllowed() == 1
                                        && (int) table.getValueAt(row, 7) == Lists.op_list.get(i).getOperationID()) {
                                    cellComponent.setBackground(Colors.green_dark);
                                    cellComponent.setForeground(Color.BLACK);
                                } else if (Lists.op_list.get(i).getComprovanteAllowed() == 2
                                        && (int) table.getValueAt(row, 7) == Lists.op_list.get(i).getOperationID()) {
                                    cellComponent.setBackground(Colors.yellow_dark);
                                    cellComponent.setForeground(Color.WHITE);
                                }
                            }

                            if (column == 9 && !isSelected) {
                                if (Lists.op_list.get(i).getPreBolSent() == 1
                                        && (int) table.getValueAt(row, 7) == Lists.op_list.get(i).getOperationID()) {
                                    cellComponent.setBackground(Colors.green);
                                } else if (Lists.op_list.get(i).getPreBolSent() == 2
                                        && (int) table.getValueAt(row, 7) == Lists.op_list.get(i).getOperationID()) {
                                    cellComponent.setBackground(Colors.yellow);
                                } else if (Lists.op_list.get(i).getPreBolSent() == 0
                                        && (int) table.getValueAt(row, 7) == Lists.op_list.get(i).getOperationID()) {
                                    cellComponent.setBackground(Color.WHITE);
                                    if ((row % 2) == 0) cellComponent.setBackground(Colors.gray);
                                }
                            }
                        }
                    }
                }

            } else {
                cellComponent.setBackground(Color.WHITE);
                cellComponent.setForeground(Color.BLACK);
            }

            vis.reset();
            return cellComponent;
        }
    }

Answer 1

这是一个MCVE，它在屏幕上放置了一百万行（249,698条记录）的表格。使用渲染器。

它看起来很快，并且在滚动时没有显示延迟或延迟。

所以这支持了这个必须成为我们尚未测试的代码中的问题的想法。

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.table.*;
import java.util.ArrayList;

public class UnicodeTable {

    private JComponent ui = null;

    UnicodeTable() {
        initUI();
    }

    public final void initUI() {
        if (ui != null) {
            return;
        }

        ui = new JPanel(new BorderLayout(4, 4));
        ui.setBorder(new EmptyBorder(4, 4, 4, 4));

        ArrayList<Integer> definedCharacters = new ArrayList<Integer>();
        for (int codePoint = 0; codePoint < Character.MAX_CODE_POINT; codePoint++) {
            if (Character.isDefined(codePoint)) {
                definedCharacters.add(codePoint);
            }
        }
        System.out.println("Number of codepoints: " + definedCharacters.size());
        TableModel tm = new UnicodeTableModel(definedCharacters);
        JTable table = new JTable(tm);
        table.setAutoCreateRowSorter(true);
        ui.add(new JScrollPane(table));
        table.setDefaultRenderer(String.class, new UnicodeTableCellRenderer());
    }

    public JComponent getUI() {
        return ui;
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception useDefault) {
                }
                UnicodeTable o = new UnicodeTable();

                JFrame f = new JFrame(o.getClass().getSimpleName());
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                f.setLocationByPlatform(true);

                f.setContentPane(o.getUI());
                f.pack();
                f.setMinimumSize(f.getSize());

                f.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

class UnicodeTableModel extends AbstractTableModel {

    ArrayList<Integer> codePoints;

    String[] colNames = {
        "Number", "Name", "Alphabetic", "Digit", "ISO Control"
    };

    Class[] colClass = {
        Integer.class, String.class, 
        Boolean.class, Boolean.class, Boolean.class
    };

    public UnicodeTableModel(ArrayList<Integer> codePoints) {
        this.codePoints = codePoints;
    }

    @Override
    public int getRowCount() {
        return codePoints.size();
    }

    @Override
    public int getColumnCount() {
        return colNames.length;
    }

    @Override
    public String getColumnName(int columnIndex) {
        return colNames[columnIndex];
    }

    @Override
    public Class<?> getColumnClass(int columnIndex) {
        return colClass[columnIndex];
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Integer codePoint = codePoints.get(rowIndex);
        switch (columnIndex) {
            case 0:
                return codePoint;
            case 1:
                return Character.getName(codePoint);
            case 2:
                return Character.isAlphabetic(codePoint);
            case 3:
                return Character.isDigit(codePoint);
            case 4:
                return Character.isISOControl(codePoint);
            default:
                return new Object();
        }
    }
}

class UnicodeTableCellRenderer extends DefaultTableCellRenderer {

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        Component c = super.getTableCellRendererComponent(
                table, value, isSelected, hasFocus, row, column);
        if (column == 1) {
            JLabel l = (JLabel) c;
            Font f = l.getFont();
            f = new Font(Font.MONOSPACED, Font.ITALIC, f.getSize());
            l.setFont(f);
        }
        return c;
    }
}

超过100行的JTable落后于应用程序

1 个答案: