Printing 如何打印预览JTable
我是一名初级Java开发人员，我想构建一个类，该类接受JTable并在屏幕上预览如何在默认打印机上打印它。这就是我们所说的“打印预览”，就像MS Word、Excel等 正如我们已经知道的，Java不支持这种开箱即用的功能 根据我在谷歌上找到的一些例子，我构建了两个类。第一个TestPreview.java justs显示JTable，第二个PrintPreview.java预览如何在打印机上打印JTable 我有两个按钮来浏览页面，“上一页”和“下一页”以及“打印”按钮来打印JTable。 我的问题是，当我的JTable在多个页面中有太多行和跨距时，PrintPreview无法工作。它会一次又一次地显示同一页面。此外，它不会显示整个JTable数据，但只显示其中的一些数据，我不知道为什么 请帮忙 下面是我的两门课 TestPreview.java PrintPreview.javaPrinting 如何打印预览JTable,printing,jtable,preview,Printing,Jtable,Preview,我是一名初级Java开发人员，我想构建一个类，该类接受JTable并在屏幕上预览如何在默认打印机上打印它。这就是我们所说的“打印预览”，就像MS Word、Excel等 正如我们已经知道的，Java不支持这种开箱即用的功能 根据我在谷歌上找到的一些例子，我构建了两个类。第一个TestPreview.java justs显示JTable，第二个PrintPreview.java预览如何在打印机上打印JTable 我有两个按钮来浏览页面，“上一页”和“下一页”以及“打印”按钮来打印JTable。 我
PackagePrintPreviewDemo；
导入javax.swing.*；
导入java.awt.*；
导入java.awt.event.*；
导入java.awt.image.buffereImage；
导入java.awt.print.*；
类PrintPreview扩展JFrame实现ActionListener、ItemListener{
JButton printButton=新JButton（“打印”）；
Pageable Pageable=null；
双刻度=1.0；
第[]页=空；
JComboBox combobox=新的JComboBox（）；
CardLayout CardLayout=新的CardLayout（）；
JPanel previewPanel=新的JPanel（cardlayout）；
JButton backButton=新JButton（“上一个”），forwardButton=新JButton（“下一个”）；
公共打印预览（最终可打印打印，最终页面格式PageFormat）{
超级（“打印预览”）；
pageable=新的pageable（）{
@凌驾
public int getNumberOfPages（）{
Graphics Graphics=新的BuffereImage（1，1，BuffereImage.TYPE_INT_RGB）.getGraphics（）；
int numPages=0；
试一试{
while（可打印的.print（图形、页面格式、numPages）==可打印的.PAGE_存在）{
numPages++；
}
}捕获（例外情况除外）{
}
返回数值；
}
@凌驾
公共页面格式getPageFormat（int x）{
返回页面格式；
}
@凌驾
公共可打印getPrintable（int x）{
返回可打印；
}
};
createPreview（）；
}
私有void createPreview（）{
page=新页面[pageable.getNumberOfPages（）]；
PageFormat PageFormat=pageable.getPageFormat（0）；
维度大小=新维度（（int）pageFormat.getPaper（）.getWidth（），（int）pageFormat.getPaper（）.getHeight（））；
if（pageFormat.getOrientation（）！=pageFormat.Grait）{
尺寸=新尺寸（尺寸.高度，尺寸.宽度）；
}
for（int i=0；i1）；
临时添加（组合框）；
温度添加（后退按钮）；
温度添加（前进按钮）；
温度添加（打印按钮）；
顶部面板添加（温度）；
printButton.addActionListener（此）；
combobox.addItemListener（此）；
getContentPane（）.add（topPanel，“北”）；
}
@凌驾
公共无效itemStateChanged（ItemEvent ie）{
显示（预览面板，（字符串）组合框.getSelectedItem（））；
backButton.setEnabled（combobox.getSelectedIndex（）==0？false:true）；
forwardButton.setEnabled（combobox.getSelectedIndex（）==combobox.getItemCount（）-1？false:true）；
验证（）；
}
@凌驾
已执行的公共无效行动（行动事件ae）{
对象o=ae.getSource（）；
如果（o==printButton）{
试一试{
PrinterJob pj=PrinterJob.getPrinterJob（）；
pj.defaultPage（pageable.getPageFormat（0））；
pj.可设置分页（可分页）；
if（pj.printDialog（））{
pj.print（）；
}
}捕获（例外情况除外）{
showMessageDialog（null，例如toString（），“打印错误”，1）；
}
}else if（o==backButton）{
combobox.setSelectedIndex（combobox.getSelectedIndex（）==0？0:combobox.getSelectedIndex（）-1）；
if（combobox.getSelectedIndex（）==0）{
backButton.setEnabled（错误）；
}
}else if（o==转发按钮）{
combobox.setSelectedIndex（combobox.getSelectedIndex（）==combobox.getItemCount（）-1？0:combobox.getSelectedIndex（）+1）；
if（combobox.getSelectedIndex（）==combobox.getItemCount（）-1）{
forwardButton.setEnabled（错误）；
}
}
}
类页扩展了JLabel{
最终整数n；
最终页面格式页面格式；
BuffereImage bufferimage=null；
维度大小=空；
公共页（int currentpage，维度大小）{
这个。大小=大小；
bufferimage=新的BuffereImage（size.width、size.height、buffereImage.TYPE_INT_RGB）；
n=当前页面；
pageformat=pageable.getPageFormat（n）；
图形g=bufferimage.g
package printpreviewdemo;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.*;
import java.awt.print.*;
import java.text.MessageFormat;
import javax.print.attribute.*;
import javax.print.attribute.standard.MediaPrintableArea;
import javax.print.attribute.standard.OrientationRequested;
import javax.print.attribute.standard.Sides;
import javax.swing.JTable.PrintMode;
class TestPreview extends JFrame implements ActionListener {
PrinterJob printerJob = PrinterJob.getPrinterJob();
HashPrintRequestAttributeSet attributes = new HashPrintRequestAttributeSet();
JTable table = null;
public TestPreview() {
super("Test of Print Preview");
getContentPane().add(createTable());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setExtendedState(Frame.MAXIMIZED_BOTH);
setVisible(true);
}
private JPanel createTable() {
String val[][] = {
{"A", "Test 01", "A", "Test 01"},
{"B", "Test 02", "B", "Test 02"},
{"C", "Test 03", "C", "Test 03"},
{"D", "Test 04", "D", "Test 04"},
{"E", "Test 05", "E", "Test 05"},
{"F", "Test 06", "F", "Test 06"},
{"G", "Test 01", "G", "Test 01"},
{"H", "Test 02", "H", "Test 02"},
{"I", "Test 03", "I", "Test 03"},
{"J", "Test 03", "J", "Test 03"},
{"K", "Test 04", "K", "Test 04"},
{"L", "Test 05", "L", "Test 05"},
{"M", "Test 06", "M", "Test 06"},
{"N", "Test 01", "N", "Test 01"},
{"O", "Test 02", "O", "Test 02"},
{"P", "Test 03", "P", "Test 03"},
{"Q", "Test 04", "Q", "Test 04"},
{"R", "Test 05", "R", "Test 05"},
{"S", "Test 06", "S", "Test 06"},
{"T", "Test 01", "T", "Test 01"},
{"U", "Test 02", "U", "Test 02"},
{"V", "Test 03", "V", "Test 03"},
{"W", "Test 04", "W", "Test 04"},
{"X", "Test 05", "X", "Test 05"},
{"Y", "Test 06", "Y", "Test 06"},
{"Z", "Test 01", "Z", "Test 01"},
{"1", "Test 02", "1", "Test 02"},
{"2", "Test 03", "2", "Test 03"},
{"3", "Test 04", "3", "Test 04"},
{"4", "Test 05", "4", "Test 05"},
{"5", "Test 06", "5", "Test 06"},
{"6", "Test 01", "6", "Test 01"},
{"7", "Test 02", "7", "Test 02"},
{"8", "Test 03", "8", "Test 03"},
{"9", "Test 04", "9", "Test 04"},
{"10", "Test 05","10", "Test 05"},
{"11", "Test 02","11", "Test 02"},
{"12", "Test 03","12", "Test 03"},
{"13", "Test 04","13", "Test 04"},
{"14", "Test 05","14", "Test 05"},
{"15", "Test 06","15", "Test 06"},
{"16", "Test 01","16", "Test 01"},
{"17", "Test 02","17", "Test 02"},
{"18", "Test 03","18", "Test 03"},
{"19", "Test 04","19", "Test 04"},
{"20", "Test 05","20", "Test 05"},
{"30", "Test 05","30", "Test 05"},
{"31", "Test 02","31", "Test 02"},
{"32", "Test 03","32", "Test 03"},
{"33", "Test 04","33", "Test 04"},
{"34", "Test 05","34", "Test 05"},
{"35", "Test 06","35", "Test 06"},
{"36", "Test 01","36", "Test 01"},
{"37", "Test 02","37", "Test 02"},
{"38", "Test 03","38", "Test 03"},
{"39", "Test 04","39", "Test 04"},
{"40", "Test 05","40", "Test 05"},
{"40", "Test 05","40", "Test 05"},
{"41", "Test 02","41", "Test 02"},
{"42", "Test 03","42", "Test 03"},
{"43", "Test 04","43", "Test 04"},
{"44", "Test 05","44", "Test 05"},
{"45", "Test 06","45", "Test 06"},
{"46", "Test 01","46", "Test 01"},
{"47", "Test 02","47", "Test 02"},
{"48", "Test 03","48", "Test 03"},
{"49", "Test 04","49", "Test 04"},
{"50", "Test 05","50", "Test 05"},
{"50", "Test 05","50", "Test 05"},
{"51", "Test 02","51", "Test 02"},
{"52", "Test 03","52", "Test 03"},
{"53", "Test 04","53", "Test 04"},
{"54", "Test 05","54", "Test 05"},
{"55", "Test 06","55", "Test 06"},
{"56", "Test 01","56", "Test 01"},
{"57", "Test 02","57", "Test 02"},
{"58", "Test 03","58", "Test 03"},
{"59", "Test 04","59", "Test 04"},
{"60", "Test 05","60", "Test 05"}
};
String headers[] = {"A", "B", "C", "D"};
table = new JTable(val, headers);
JButton previewButton = new JButton("Preview Table");
previewButton.addActionListener(this);
JPanel panel = new JPanel(new BorderLayout()), top = new JPanel(new FlowLayout());
top.add(previewButton);
panel.add(top, "North");
panel.add(new JScrollPane(table), "Center");
return panel;
}
@Override
public void actionPerformed(ActionEvent ae) {
if (ae.getActionCommand().equals("Preview Table"))
attributes.add(new MediaPrintableArea(6, 6, 198, 278, MediaPrintableArea.MM)); // A4: 210x297mm
attributes.add(Sides.DUPLEX);
attributes.add(OrientationRequested.LANDSCAPE);
new PrintPreview(
table.getPrintable(PrintMode.FIT_WIDTH, null, new MessageFormat("Page {0}") ),
printerJob.getPageFormat(attributes)
);
}
public static void main(String arg[]) {
new TestPreview();
}
}
package printpreviewdemo;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.awt.print.*;
class PrintPreview extends JFrame implements ActionListener, ItemListener {
JButton printButton = new JButton("Print");
Pageable pageable = null;
double scale = 1.0;
Page page[] = null;
JComboBox combobox = new JComboBox();
CardLayout cardlayout = new CardLayout();
JPanel previewPanel = new JPanel(cardlayout);
JButton backButton = new JButton("PREV"), forwardButton = new JButton("NEXT");
public PrintPreview(final Printable printable, final PageFormat pageFormat) {
super("Print Preview");
pageable = new Pageable() {
@Override
public int getNumberOfPages() {
Graphics graphics = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB).getGraphics();
int numPages = 0;
try {
while (printable.print(graphics, pageFormat, numPages) == Printable.PAGE_EXISTS) {
numPages++;
}
} catch (Exception ex) {
}
return numPages;
}
@Override
public PageFormat getPageFormat(int x) {
return pageFormat;
}
@Override
public Printable getPrintable(int x) {
return printable;
}
};
createPreview();
}
private void createPreview() {
page = new Page[pageable.getNumberOfPages()];
PageFormat pageFormat = pageable.getPageFormat(0);
Dimension size = new Dimension((int) pageFormat.getPaper().getWidth(), (int) pageFormat.getPaper().getHeight());
if (pageFormat.getOrientation() != PageFormat.PORTRAIT) {
size = new Dimension(size.height, size.width);
}
for (int i = 0; i < page.length; i++) {
combobox.addItem("" + (i + 1));
page[i] = new Page(i, size);
previewPanel.add("" + (i + 1), new JScrollPane(page[i]));
}
setTopPanel();
getContentPane().add(previewPanel, "Center");
pack();
setExtendedState(Frame.MAXIMIZED_BOTH);
setVisible(true);
}
private void setTopPanel() {
FlowLayout fl = new FlowLayout();
GridBagLayout gbl = new GridBagLayout();
JPanel topPanel = new JPanel(gbl), temp = new JPanel(fl);
backButton.addActionListener(this);
forwardButton.addActionListener(this);
backButton.setEnabled(false);
forwardButton.setEnabled(page.length > 1);
temp.add(combobox);
temp.add(backButton);
temp.add(forwardButton);
temp.add(printButton);
topPanel.add(temp);
printButton.addActionListener(this);
combobox.addItemListener(this);
getContentPane().add(topPanel, "North");
}
@Override
public void itemStateChanged(ItemEvent ie) {
cardlayout.show(previewPanel, (String) combobox.getSelectedItem());
backButton.setEnabled(combobox.getSelectedIndex() == 0 ? false : true);
forwardButton.setEnabled(combobox.getSelectedIndex() == combobox.getItemCount() - 1 ? false : true);
validate();
}
@Override
public void actionPerformed(ActionEvent ae) {
Object o = ae.getSource();
if (o == printButton) {
try {
PrinterJob pj = PrinterJob.getPrinterJob();
pj.defaultPage(pageable.getPageFormat(0));
pj.setPageable(pageable);
if (pj.printDialog()) {
pj.print();
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, ex.toString(), "Error in Printing", 1);
}
} else if (o == backButton) {
combobox.setSelectedIndex(combobox.getSelectedIndex() == 0 ? 0 : combobox.getSelectedIndex() - 1);
if (combobox.getSelectedIndex() == 0) {
backButton.setEnabled(false);
}
} else if (o == forwardButton) {
combobox.setSelectedIndex(combobox.getSelectedIndex() == combobox.getItemCount() - 1 ? 0 : combobox.getSelectedIndex() + 1);
if (combobox.getSelectedIndex() == combobox.getItemCount() - 1) {
forwardButton.setEnabled(false);
}
}
}
class Page extends JLabel {
final int n;
final PageFormat pageformat;
BufferedImage bufferimage = null;
Dimension size = null;
public Page(int currentpage, Dimension size) {
this.size = size;
bufferimage = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);
n = currentpage;
pageformat = pageable.getPageFormat(n);
Graphics g = bufferimage.getGraphics();
g.setColor(Color.WHITE);
g.fillRect(0, 0, (int) pageformat.getWidth(), (int) pageformat.getHeight());
try {
pageable.getPrintable(n).print(g, pageformat, n);
} catch (Exception ex) {
}
setIcon(new ImageIcon(bufferimage));
}
}
}