请问JAVA如何实现打印及打印预览功能？

Posted 2023-04-03

内容如题（此为桌面应用程序，非JSP）开发环境 JDK1.5 JBulider2006请给出详细源码，以及注释谢谢

package com.szallcom.tools;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.print.PageFormat;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;

import wf.common.SystemProperties;

public class PrintPreviewDialog extends JDialog implements ActionListener

private JButton nextButton = new JButton("Next");
private JButton previousButton = new JButton("Previous");
private JButton closeButton = new JButton("Close");
private JPanel buttonPanel = new JPanel();
private PreviewCanvas canvas;

public PrintPreviewDialog(Frame parent, String title, boolean modal,
PrintTest pt, String str)
super(parent, title, modal);
canvas = new PreviewCanvas(pt, str);
setLayout();


private void setLayout()
this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().add(canvas, BorderLayout.CENTER);

nextButton.setMnemonic('N');
nextButton.addActionListener(this);
buttonPanel.add(nextButton);
previousButton.setMnemonic('N');
previousButton.addActionListener(this);
buttonPanel.add(previousButton);
closeButton.setMnemonic('N');
closeButton.addActionListener(this);
buttonPanel.add(closeButton);
this.getContentPane().add(buttonPanel, BorderLayout.SOUTH);
this.setBounds((int) ((SystemProperties.SCREEN_WIDTH - 400) / 2),
(int) ((SystemProperties.SCREEN_HEIGHT - 400) / 2), 400, 400);


public void actionPerformed(ActionEvent evt)
Object src = evt.getSource();
if (src == nextButton)
nextAction();
else if (src == previousButton)
previousAction();
else if (src == closeButton)
closeAction();


private void closeAction()
this.setVisible(false);
this.dispose();


private void nextAction()
canvas.viewPage(1);


private void previousAction()
canvas.viewPage(-1);


class PreviewCanvas extends JPanel
private String printStr;
private int currentPage = 0;
private PrintTest preview;

public PreviewCanvas(PrintTest pt, String str)
printStr = str;
preview = pt;


public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
PageFormat pf = PrinterJob.getPrinterJob().defaultPage();

double xoff;
double yoff;
double scale;
double px = pf.getWidth();
double py = pf.getHeight();
double sx = getWidth() - 1;
double sy = getHeight() - 1;
if (px / py < sx / sy)
scale = sy / py;
xoff = 0.5 * (sx - scale * px);
yoff = 0;
else
scale = sx / px;
xoff = 0;
yoff = 0.5 * (sy - scale * py);

g2.translate((float) xoff, (float) yoff);
g2.scale((float) scale, (float) scale);

Rectangle2D page = new Rectangle2D.Double(0, 0, px, py);
g2.setPaint(Color.white);
g2.fill(page);
g2.setPaint(Color.black);
g2.draw(page);

try
preview.print(g2, pf, currentPage);
catch (PrinterException pe)
g2.draw(new Line2D.Double(0, 0, px, py));
g2.draw(new Line2D.Double(0, px, 0, py));



public void viewPage(int pos)
int newPage = currentPage + pos;
if (0 <= newPage && newPage < preview.getPagesCount(printStr))
currentPage = newPage;
repaint();





package wf.common;

import java.awt.Dimension;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;

public final class SystemProperties

public static final double SCREEN_WIDTH = Toolkit.getDefaultToolkit().getScreenSize().getWidth();
public static final double SCREEN_HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().getHeight();
public static final String USER_DIR = System.getProperty("user.dir");
public static final String USER_HOME = System.getProperty("user.home");
public static final String USER_NAME = System.getProperty("user.name");
public static final String FILE_SEPARATOR = System.getProperty("file.separator");
public static final String LINE_SEPARATOR = System.getProperty("line.separator");
public static final String PATH_SEPARATOR = System.getProperty("path.separator");
public static final String JAVA_HOME = System.getProperty("java.home");
public static final String JAVA_VENDOR = System.getProperty("java.vendor");
public static final String JAVA_VENDOR_URL = System.getProperty("java.vendor.url");
public static final String JAVA_VERSION = System.getProperty("java.version");
public static final String JAVA_CLASS_PATH = System.getProperty("java.class.path");
public static final String JAVA_CLASS_VERSION = System.getProperty("java.class.version");
public static final String OS_NAME = System.getProperty("os.name");
public static final String OS_ARCH = System.getProperty("os.arch");
public static final String OS_VERSION = System.getProperty("os.version");
public static final String[] FONT_NAME_LIST = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
public static final Font[] FONT_LIST = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
参考技术A 猪哥解答：
我这里有以前收藏的代码，两个类实现了简易的文本打印机的功能，包括预览。简单跟你说一下。
1、PrinterDemo.java主体类，也是入口类，里面有main方法可以直接在Eclipse中调试运行，他实现了从本地磁盘读取文本类文件打印以及打印预览的功能，其中File动作按钮中的PrintPreviw就是打印预览功能，你可以运行看看。
2、PrintPreview.java打印预览类，这是专门为预览打印设计的类，通过他的构造方法可以构造出一个预览类，PrinterDemo中的预览功能就是调用了这个类。

两个类放在同一个包下。

提交不上去，我把源码贴上来提交不了，字数也没有超标。你留一个邮箱，或者等我的文库上传的源码吧，我放到文库里，还在审批。

问题补充：档案已经上传到文库里了，地址是
DOC格式的：http://wenku.baidu.com/view/048ae0e8856a561252d36fab.html
PDF格式的：http://wenku.baidu.com/view/67c57a69011ca300a6c390fd.html
你下来看看吧。

Qt实现Qchart的打印和打印预览的几种方法

实现打印预览和打印，是挺常用的功能。把其他一些内容如QTextBrowser或者QEditText打印和打印预览是容易的，因为它们都自带了print方法，可以直接输出到printer。这里介绍下Qt实现Qchart的打印和打印预览的几种方法。

首选介绍下Qt如何实现打印预览功能。

 

打印预览的实现

使用Qt自带的QPrintPreviewDialog和QPrinter。

void MainWindow::PrintPreview()

    QPrinter printer(QPrinter::HighResolution);
    //自定义纸张大小，特别重要，不然预览效果极差
    printer.setPageSize(QPrinter::Custom);
    printer.setPaperSize(QSizeF(600, 800),QPrinter::Point);
    QPrintPreviewDialog preview(&printer, this);// 创建打印预览对话框

    preview.setMinimumSize(1000,600);

    connect(&preview,SIGNAL(paintRequested(QPrinter*)),this,SLOT(Preview(QPrinter*) ) );
    preview.exec(); //打印对话框显示，paintRequest触发

void MainWindow::Preview(QPrinter *printer)

    ui->textBrowser->print(printer);

Qchart的打印

方法一，使用QTextDocument 

打印html文件模板。html文件中带上图片路径：

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>特立独行的猫哥</title>
</head>
<body>
    <h1>我的第一个标题</h1>
	<p>一个来自文件中的图像:</p>
<img src="./chart1.png"  width="600" height="400">
</body>
</html>

void MainWindow::Preview(QPrinter *printer)

    //ui->tb->print(printer);
    QString fileContent = "";
    QFile file1("./test.html");   //htmlfileName：本地的制作好的html文件
    if (file1.open(QIODevice::ReadOnly))
    
        QTextStream fs(&file1);
        fs.setCodec("UTF-8"); //Qt 使用 UTF-8 编码读取文件,解决打印的文件中文乱码
        fileContent = fs.readAll();
        file1.close();
    
    QTextDocument textDocument;
    textDocument.setHtml(fileContent);
    textDocument.print(printer);

方法二，使用QPainter 

void MainWindow::Preview(QPrinter *printer)

    //ui->tb->print(printer);

    QPainter painter(printer);
    QPixmap pix;
    pix.load("./chart1.png");
   // painter.drawPixmap(0,0,850,850,pix); //在（0，0）点起始的宽高均为50的句型中显示图片

    qreal wid = pix.width(); //获取图像的宽高
    qreal hei = pix.height();
    pix = pix.scaled(wid*5,hei*5,Qt::KeepAspectRatio);//将图片宽高扩大两倍，且在矩形内保持宽高比值
    painter.drawPixmap(0,0,pix);

保存Qchart为图片

   //抓取qchart图片
    QPixmap pix =  ui->qchart2->grab();
    QImage image = pix.toImage();
    QString imgname = "_chart2.png";
    imgname = PIC_PATH+imgname;
    image.save(imgname);

引用

QT打印，打印预览_尔容又夏的博客-CSDN博客_qt打印预览

QT实现打印预览及生成Pdf功能_小MarkK的博客-CSDN博客_qt打印pdf

【QT5】QPixmap的使用_&Mr.Gong的博客-CSDN博客_qpixmap用法

C/C++ Qt QChart 绘图组件应用_LyShark 孤风洗剑的博客-CSDN博客

1.关于QT中的Graphics绘图，定时器，动画，将窗口中的内容打印到图片上，打印机，打印预览_to.to的博客-CSDN博客