使用Java轉換具有尺寸的圖像的代碼並打印轉換後的圖像。
類別： ConvertImageWithDimensionsAndPrint.java
package com.test.convert;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
public class ConvertImageWithDimensionsAndPrint {
private static final int IMAGE_WIDTH = 800;
private static final int IMAGE_HEIGHT = 1000;
public static void main(String[] args) {
try {
String sourceDir = "C:/Images/04-Request-Headers_1.png";
File sourceFile = new File(sourceDir);
String destinationDir = "C:/Images/ConvertedImages/";//Converted images save here
File destinationFile = new File(destinationDir);
if (!destinationFile.exists()) {
destinationFile.mkdir();
}
if (sourceFile.exists()) {
String fileName = sourceFile.getName().replace(".png", "");
BufferedImage bufferedImage = ImageIO.read(sourceFile);
int type = bufferedImage.getType() == 0 ? BufferedImage.TYPE_INT_ARGB : bufferedImage.getType();
BufferedImage resizedImage = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, type);
Graphics2D graphics2d = resizedImage.createGraphics();
graphics2d.drawImage(bufferedImage, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, null);//resize goes here
graphics2d.dispose();
ImageIO.write(resizedImage, "png", new File(destinationDir + fileName +".png"));
int oldImageWidth = bufferedImage.getWidth();
int oldImageHeight = bufferedImage.getHeight();
System.out.println(sourceFile.getName() +" OldFile with Dimensions: "+ oldImageWidth +"x"+ oldImageHeight);
System.out.println(sourceFile.getName() +" ConvertedFile converted with Dimensions: "+ IMAGE_WIDTH +"x"+ IMAGE_HEIGHT);
//Print the image file
PrintActionListener printActionListener = new PrintActionListener(resizedImage);
printActionListener.run();
} else {
System.err.println(destinationFile.getName() +" File not exists");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
PrintActionListener.java的Reference
package com.test.convert;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
public class PrintActionListener implements Runnable {
private BufferedImage image;
public PrintActionListener(BufferedImage image) {
this.image = image;
}
@Override
public void run() {
PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintable(new ImagePrintable(printJob, image));
if (printJob.printDialog()) {
try {
printJob.print();
} catch (PrinterException prt) {
prt.printStackTrace();
}
}
}
public class ImagePrintable implements Printable {
private double x, y, width;
private int orientation;
private BufferedImage image;
public ImagePrintable(PrinterJob printJob, BufferedImage image) {
PageFormat pageFormat = printJob.defaultPage();
this.x = pageFormat.getImageableX();
this.y = pageFormat.getImageableY();
this.width = pageFormat.getImageableWidth();
this.orientation = pageFormat.getOrientation();
this.image = image;
}
@Override
public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
if (pageIndex == 0) {
int pWidth = 0;
int pHeight = 0;
if (orientation == PageFormat.PORTRAIT) {
pWidth = (int) Math.min(width, (double) image.getWidth());
pHeight = pWidth * image.getHeight()/image.getWidth();
} else {
pHeight = (int) Math.min(width, (double) image.getHeight());
pWidth = pHeight * image.getWidth()/image.getHeight();
}
g.drawImage(image, (int) x, (int) y, pWidth, pHeight, null);
return PAGE_EXISTS;
} else {
return NO_SUCH_PAGE;
}
}
}
}
輸出：
04-Request-Headers_1.png OldFile with Dimensions: 1224x1584
04-Request-Headers_1.png ConvertedFile converted with Dimensions: 800x1000
一個圖像的轉換後打印窗口將開放用於打印轉換後的圖像。窗口顯示如下，從選擇打印機名稱下拉框並點擊確定按鈕。
我不確定你的建議。也許我應該縮放圖像，然後畫線？我不想縮放圖像或線條，而我的屏幕和打印機都有大量的DPI來顯示所有細節。我提到了線條，但也有很多很小的（10像素方塊）圖標，如果我縮放1/2，它們就會變得模糊不清。這對我來說沒有意義，這很不容易（大概很簡單，我只是不知道該怎麼做）。 – Ingrid 2010-06-17 01:02:31
Printable提供了一個Graphics2D對象：'public int print（Graphics g，PageFormat pf，int page）'。不要將您的頁面渲染爲一個巨大的像素化圖像，而應將其渲染爲矢量圖形調用：例如，多個'g.drawLine（）'和'g.drawImage（）'調用。 – Justin 2010-06-17 11:43:52
我會試試看看它的外觀。如果我理解正確，但這隻會讓不那麼細緻的顯示效果更好。有沒有辦法顯示和打印所有的細節？ – Ingrid 2010-06-17 18:38:34