我编写了一个Java应用程序，我需要一个JTable类的对象，它具有一些功能：
但是我的代码无法快速运行并且没有完整的主要功能，我在最后一个问题中编写了应用程序的最低版本：
这是我的gui类：
import javax.swing.*;
import java.awt.*;
public class GUI extends JFrame {
private BankTable table;
private JScrollPane scrollPane;
public GUI(){
super("Bank Table");
JPanel contentPanel = new JPanel();
setContentPane(contentPanel);
contentPanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
setLayout(new BorderLayout());
setMinimumSize(new Dimension(1000,700));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
makeTable();
scrollPane = new JScrollPane(table);
scrollPane.getVerticalScrollBar().setUnitIncrement(50);
add(scrollPane,BorderLayout.CENTER);
setVisible(true);
}
public void makeTable(){
String[][]data= new String[][]{{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/01"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/02"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/03"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/04"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/05"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/06"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/07"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/08"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/09"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/10"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/11"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/12"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/13"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/14"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/15"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/16"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/17"},
{"0212670003009", "ص 318", "77081111111111111111111111111111111111634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/18"},
{"0212670003009", "ص 318", "77081222222222222222222222222222634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/19"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/20"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/21"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/22"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/23"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/24"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/25"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/26"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/27"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/28"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/29"},
{"0212670003009", "ص 318", "77081634","38000000","0","331142","2102","وصول چک","08:56:46","1397/05/30"}};
String[] columns= new String[]{"شماره حساب", "اطلاعات اضافه", "مانده","واریز","برداشت","فیش/ حواله","کد شعبه","شرح","ساعت","تاریخ"};
table = new BankTable(data,columns);
table.updateRowHeights();
System.out.println("Table");
}
public static void main(String args[]){
GUI gui = new GUI();
}
}
这是表格的呈现：
import java.awt.*;
import javax.swing.*;
import javax.swing.table.TableCellRenderer;
public class TextAreaRenderer extends JTextArea
implements TableCellRenderer {
public TextAreaRenderer() {
setLineWrap(true);
setWrapStyleWord(true);
setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
setEditable(false);
setCursor(null);
setOpaque(false);
setFocusable(false);
setLineWrap(true);
setWrapStyleWord(true);
}
public Component getTableCellRendererComponent(JTable jTable,
Object obj, boolean isSelected, boolean hasFocus, int row,
int column) {
setText((String)obj);
setFont(new Font("bnazanin", Font.BOLD, 15));
return this;
}
}
这是表类：
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.*;
public class BankTable extends JTable {
public BankTable(String[][] data,String[] columns){
super(data,columns);
setForeground(Color.BLACK);
setBounds(60,80,400,600);
changeTableHeader();
DefaultTableCellRenderer rightRenderer = new DefaultTableCellRenderer();
rightRenderer.setHorizontalAlignment(JLabel.RIGHT);
TextAreaRenderer textAreaRenderer = new TextAreaRenderer();
for(int i=0 ; i<columns.length ; i++){
getColumnModel().getColumn(i).setCellRenderer(textAreaRenderer);
}
}
public void changeTableHeader(){
getTableHeader().setBackground(new Color(57,77,112));
getTableHeader().setForeground(Color.WHITE);
getTableHeader().setFont(new Font("Calibri Light", Font.BOLD, 20));
}
@Override
public boolean isCellEditable(int i, int i1) {
return false;
}
public void updateRowHeights()
{
for (int row = 0; row < getRowCount(); row++)
{
int rowHeight = getRowHeight();
for (int column = 0; column < getColumnCount(); column++)
{
Component comp = prepareRenderer(getCellRenderer(row, column), row, column);
rowHeight = Math.max(rowHeight, comp.getPreferredSize().height);
}
setRowHeight(row, rowHeight + 20);
}
}
}
答案 0 :(得分：1)
在这里值得花的是我躺在的一些旧代码。
它使用带换行的JTextArea，但将文本区域中的行限制为2行。然后，您可以滚动文本区域以查看其他行。
也许这种方法可以帮助您满足要求？
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class TableTextArea extends JFrame
{
public TableTextArea()
{
JTable table = new JTable(40, 5);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
table.setRowHeight(40);
table.setValueAt("one two three four five six seven eight nine ten", 0, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 1, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 0, 4);
table.setValueAt("one two three four five six seven eight nine ten", 2, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 3, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 4, 4);
table.setValueAt("one two three four five six seven eight nine ten", 5, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 6, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 7, 4);
table.setValueAt("one two three four five six seven eight nine ten", 8, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 9, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 10, 4);
table.setValueAt("one two three four five six seven eight nine ten", 11, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 12, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 13, 4);
table.setValueAt("one two three four five six seven eight nine ten", 14, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 15, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 16, 4);
table.setValueAt("one two three four five six seven eight nine ten", 17, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 18, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 19, 4);
table.setValueAt("one two three four five six seven eight nine ten", 20, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 21, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 22, 4);
table.setValueAt("one two three four five six seven eight nine ten", 23, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 24, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 25, 4);
table.setValueAt("one two three four five six seven eight nine ten", 26, 2);
table.setValueAt("aaa bbb ccccc dddd eeee fff ggggg hhhhh iiii jjj", 27, 2);
table.setValueAt("1111 2222 3333 4444 5555 6666 7777 8888 9999 0000", 28, 4);
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
// Override default renderer for a specific column
TableCellRenderer renderer = new TextAreaRenderer();
table.getColumnModel().getColumn(2).setCellRenderer( renderer );
table.getColumnModel().getColumn(4).setCellRenderer( renderer );
table.changeSelection(0, 0, false, false);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
TableTextArea frame = new TableTextArea();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
});
}
/*
**
*/
class TextAreaRenderer implements TableCellRenderer
{
private JTextArea renderTextArea;
private JScrollPane renderScrollPane;
private JTextArea focusTextArea;
private JScrollPane focusScrollPane;
private boolean firstTime = true;
public TextAreaRenderer()
{
renderTextArea = new JTextArea();
renderTextArea.setEditable( false );
renderTextArea.setLineWrap( true );
renderTextArea.setWrapStyleWord( true );
renderScrollPane = new JScrollPane( renderTextArea );
renderScrollPane.setBorder(null);
renderScrollPane.revalidate();
focusTextArea = new JTextArea();
focusTextArea.setEditable( false );
focusTextArea.setLineWrap( true );
focusTextArea.setWrapStyleWord( true );
focusScrollPane = new JScrollPane( focusTextArea );
focusScrollPane.setBorder(null);
}
public Component getTableCellRendererComponent(
final JTable table, Object value, boolean isSelected, boolean hasFocus, final int row, final int column)
{
// For some reason the scrollbars don't appear on the first cell renderered.
// Forcing a repaint of the cell seems to fix the problem.
if (firstTime)
{
firstTime = false;
Rectangle cellRectangle = table.getCellRect(row, column, false);
// renderScrollPane.setBounds(cellRectangle);
// table.add(renderScrollPane);
// renderScrollPane.revalidate();
table.repaint(cellRectangle);
}
System.out.println(row + " :: " + column + " : " + hasFocus);
table.remove(focusScrollPane);
renderTextArea.setText( value != null ? value.toString() : "" );
renderTextArea.setCaretPosition(0);
if (hasFocus)
{
renderTextArea.setBackground( table.getSelectionBackground() );
SwingUtilities.invokeLater( new Runnable()
{
public void run()
{
addRealTextAreaToTable(table, row, column);
}
});
}
else if (isSelected)
renderTextArea.setBackground( table.getSelectionBackground() );
else
renderTextArea.setBackground( table.getBackground() );
return renderScrollPane;
}
private void addRealTextAreaToTable(JTable table, int row, int column)
{
System.out.println(row + " :: " + column);
Object value = table.getValueAt(row, column);
focusTextArea.setText( value != null ? value.toString() : "" );
focusTextArea.setCaretPosition(0);
// focusTextArea.setBackground( table.getBackground() );
focusTextArea.setBackground( table.getSelectionBackground() );
Rectangle cellRectangle = table.getCellRect(row, column, false);
focusScrollPane.setBounds(cellRectangle);
table.add(focusScrollPane);
focusScrollPane.revalidate();
focusTextArea.requestFocusInWindow();
}
}
}
答案 1 :(得分：0)
因此，我花了一些时间来尝试各种不同的事情。
从TextAreaRenderer开始。我更喜欢使用DefaultTableCelllRenderer，但是在使用它之后，我无法使其令人满意地工作。因此，我取而代之的是，将大部分优化措施应用到TextAreaRenderer本身。
您真正想做的一件事就是减少每个getTableCellRendererComponent所做的更改量。 JTextArea已经很复杂了。
我删除了setOpaque调用，并将setFont调用移到了构造函数。我还添加了选择支持（这是我的测试的一部分）
public class TextAreaRenderer extends JTextArea
implements TableCellRenderer {
public TextAreaRenderer() {
setLineWrap(true);
setWrapStyleWord(true);
setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
setEditable(false);
setCursor(null);
//setOpaque(false);
setFocusable(false);
setLineWrap(true);
setWrapStyleWord(true);
setFont(new Font("bnazanin", Font.BOLD, 15));
getCaret().setBlinkRate(0);
}
public Component getTableCellRendererComponent(JTable jTable,
Object obj, boolean isSelected, boolean hasFocus, int row,
int column) {
setText((String) obj);
if (isSelected) {
System.out.println("!!Selected");
setBackground(jTable.getSelectionBackground());
setForeground(jTable.getSelectionForeground());
} else {
setBackground(jTable.getBackground());
setForeground(jTable.getForeground());
}
return this;
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*/
public boolean isOpaque() {
Color back = getBackground();
Component p = getParent();
if (p != null) {
p = p.getParent();
}
// p should now be the JTable.
boolean colorMatch = (back != null) && (p != null)
&& back.equals(p.getBackground())
&& p.isOpaque();
return !colorMatch && super.isOpaque();
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*
* @since 1.5
*/
public void invalidate() {
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*/
public void validate() {
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*/
public void revalidate() {
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*/
public void repaint(long tm, int x, int y, int width, int height) {
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*/
public void repaint(Rectangle r) {
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*
* @since 1.5
*/
public void repaint() {
}
/**
* Overridden for performance reasons. See the
* <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {
}
}
然后我袭击了BlankTable ...
最大的变化之一是表格现在能够动态计算行的高度。由于计算成本很高，因此将缓存此操作的结果。不过，问题是JTable也有它自己的内部缓存...这是私有的...因此，与其追踪反射路径，我们还需要提供一些补偿来避免这种副作用。 API创建。
调用setRowHeight时，JTable会调用invalidate和repaint本身。在执行计算时，我们想停止此操作，但是在某些情况下，我们仍应允许工作（例如，当调整列的大小并且JTable为invalidated时）
public class BankTable extends JTable {
public BankTable(String[][] data, String[] columns) {
super(data, columns);
changeTableHeader();
setGridColor(Color.RED);
TableCellRenderer textAreaRenderer = new TextAreaRenderer();
for (int i = 0; i < columns.length; i++) {
getColumnModel().getColumn(i).setCellRenderer(textAreaRenderer);
}
}
public void changeTableHeader() {
getTableHeader().setBackground(new Color(57, 77, 112));
getTableHeader().setForeground(Color.WHITE);
getTableHeader().setFont(new Font("Calibri Light", Font.BOLD, 20));
}
@Override
public boolean isCellEditable(int i, int i1) {
return false;
}
private Map<Integer, Integer> rowMap = new HashMap<>();
private boolean quietUpdate = false;
private boolean forceUpdate = false;
@Override
public void invalidate() {
rowMap.clear();
forceUpdate = true;
super.invalidate();
forceUpdate = false;
}
@Override
protected void resizeAndRepaint() {
if (quietUpdate) {
if (forceUpdate) {
super.resizeAndRepaint();
}
} else {
super.resizeAndRepaint();
}
}
@Override
public int getRowHeight(int row) {
Integer rowHeight = rowMap.get(row);
if (rowHeight == null) {
TableColumnModel model = getColumnModel();
rowHeight = getRowHeight();
for (int column = 0; column < getColumnCount(); column++) {
int colWidth = model.getColumn(column).getWidth();
Component comp = prepareRenderer(getCellRenderer(row, column), row, column);
comp.setSize(new Dimension(colWidth, Integer.MAX_VALUE));
rowHeight = Math.max(rowHeight, comp.getPreferredSize().height);
}
rowMap.put(row, rowHeight);
quietUpdate = true;
setRowHeight(row, rowHeight);
quietUpdate = false;
}
return rowHeight;
}
@Override
public void tableChanged(TableModelEvent e) {
if (rowMap == null) {
super.tableChanged(e);
return;
}
if (e == null || e.getFirstRow() == TableModelEvent.HEADER_ROW) {
rowMap.clear();
super.tableChanged(e);
return;
}
if (e.getType() == TableModelEvent.INSERT) {
super.tableChanged(e);
return;
}
int modelColumn = e.getColumn();
int start = e.getFirstRow();
int end = e.getLastRow();
if (e.getType() == TableModelEvent.DELETE || e.getType() == TableModelEvent.UPDATE) {
for (int row = start; row <= end; row++) {
rowMap.remove(row);
}
super.tableChanged(e);
return;
}
if (end == Integer.MAX_VALUE) {
rowMap.clear();
}
super.tableChanged(e); //To change body of generated methods, choose Tools | Templates.
}
}
还有一些其他区域可能需要进一步优化（我尚未测试排序表，因此tableChanged需要更新，并且我也未测试单元格的更改）< / p>
在初始加载之后，我发现渲染是合理的。由于使用的组件，字体和其他系统问题，您的里程可能会很公平。