如何在300dpi中强制使用Java打印图形
当我在谷歌上搜索这个问题时，不知何故java打印API受到了限制，即发送到打印机的所有图片必须以72dpi分辨率打印。我们使用jasper report打印文档，无论我们绘制多大的条形码，条形码阅读器都不会扫描它。。有类似的经历吗？如何解决此问题？您需要通过属性指定打印机分辨率。您还应该知道源分辨率，以便正确转换，例如：如何在300dpi中强制使用Java打印图形,java,api,graphics,printing,resolution,Java,Api,Graphics,Printing,Resolution,当我在谷歌上搜索这个问题时，不知何故java打印API受到了限制，即发送到打印机的所有图片必须以72dpi分辨率打印。我们使用jasper report打印文档，无论我们绘制多大的条形码，条形码阅读器都不会扫描它。。有类似的经历吗？如何解决此问题？您需要通过属性指定打印机分辨率。您还应该知道源分辨率，以便正确转换，例如： PrinterResolution pr = new PrinterResolution(300, 300, PrinterResolution.DPI); 如果图像的元数据
PrinterResolution pr = new PrinterResolution(300, 300, PrinterResolution.DPI);
如果图像的元数据中没有先前定义的DPI，Java会将图像的DPI设置为默认的Java 72dpi，因此添加MediaSizeName、PrinterResolution、MediaPrintableArea属性以获得最佳结果是不够的，您还必须在其元数据中添加图像的DPI，如本答案的方法示例所示： ，然后确保在所需的可打印区域打印其余属性，例如：
DocFlavor myFormat = DocFlavor.INPUT_STREAM.PNG;
// Build a set of attributes
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
aset.add(MediaSizeName.ISO_A10);
aset.add(new MediaPrintableArea(0, 0, 35, 24, MediaPrintableArea.MM));
aset.add(PrintQuality.HIGH);
aset.add(new PrinterResolution(203, 203, PrinterResolution.DPI));
// adding other attributes
aset.add(OrientationRequested.PORTRAIT);
aset.add(new Copies(7));
aset.add(Fidelity.FIDELITY_TRUE);
import java.awt.EventQueue;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.ServiceUI;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import static javax.print.attribute.ResolutionSyntax.DPI;
import javax.print.attribute.standard.Copies;
import javax.print.attribute.standard.Fidelity;
import javax.print.attribute.standard.MediaPrintableArea;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.OrientationRequested;
import javax.print.attribute.standard.PrintQuality;
import javax.print.attribute.standard.PrinterResolution;
import javax.print.event.PrintJobEvent;
import javax.print.event.PrintJobListener;
import javax.print.event.PrintServiceAttributeEvent;
public class PNGPrintingExample {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
try {
FileInputStream imageFile = null;
imageFile = new FileInputStream("E:\\1-and-2-1.png");
BufferedImage input = ImageIO.read(imageFile);
File output = new File("E:\\To-Be-Printed.png");
saveGridImage(output,input);
imageFile = new FileInputStream(output);
// Set the document type
DocFlavor myFormat = DocFlavor.INPUT_STREAM.PNG;
// Build a set of attributes
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
// setting media size and printing media attributes
aset.add(MediaSizeName.ISO_A10);
aset.add(new MediaPrintableArea(0, 0, 35, 24, MediaPrintableArea.MM));
aset.add(PrintQuality.HIGH);
aset.add(new PrinterResolution(203, 203, PrinterResolution.DPI));
// adding some may be needed attibutes
aset.add(OrientationRequested.PORTRAIT);
aset.add(new Copies(7));
aset.add(Fidelity.FIDELITY_TRUE);
DocPrintJob job;
Doc myDoc = new SimpleDoc(imageFile, myFormat, null);
PrintService[] services =
PrintServiceLookup.lookupPrintServices(myFormat, null);
PrintService defaultPrintService = PrintServiceLookup
.lookupDefaultPrintService();
PrintService selectedPrintService =
ServiceUI.printDialog(null, 150, 150,
services, defaultPrintService, myFormat, aset);
if(selectedPrintService!=null)
{
System.out.println("selected printer:"
+selectedPrintService.getName());
try {
job = selectedPrintService.createPrintJob();
// Create a Doc
PrintJobListener pjlForP = new PrintJobListener() {
public void attributeUpdate(PrintServiceAttributeEvent e){
System.out.println("updated");
}
@Override
public void printJobNoMoreEvents(PrintJobEvent e){
System.out.println("may be sent to "+e.getPrintJob().getPrintService());
}
@Override
public void printDataTransferCompleted(PrintJobEvent pje) {
System.out.println("print Data Transfer Completed");
}
@Override
public void printJobCompleted(PrintJobEvent pje) {
System.out.println("The print job was completed");
}
@Override
public void printJobFailed(PrintJobEvent pje) {
System.out.println("The print job has failed");
}
@Override
public void printJobCanceled(PrintJobEvent pje) {
System.out.println("The print job was cancelled");
}
@Override
public void printJobRequiresAttention(PrintJobEvent pje) {
System.out.println("The print job require attention");
}
};
job.addPrintJobListener(pjlForP);
job.print(myDoc, aset);
imageFile.close();
} catch (PrintException ex) {
Logger.getLogger(BarcodePrintingFromJava.class.getName()).log(Level.SEVERE, null, ex);
}
}
else
System.out.println("selection cancelled");
} catch (FileNotFoundException ex) {
Logger.getLogger(BarcodePrintingFromJava.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(BarcodePrintingFromJava.class.getName()).log(Level.SEVERE, null, ex);
}
});
}
public static void saveGridImage(File output,BufferedImage gridImage) throws IOException {
output.delete();
final String formatName = "png";
for (Iterator<ImageWriter> iw = ImageIO.getImageWritersByFormatName(formatName); iw.hasNext();) {
ImageWriter writer = iw.next();
ImageWriteParam writeParam = writer.getDefaultWriteParam();
ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
IIOMetadata metadata = writer.getDefaultImageMetadata(typeSpecifier, writeParam);
if (metadata.isReadOnly() || !metadata.isStandardMetadataFormatSupported()) {
continue;
}
setDPI(metadata);
final ImageOutputStream stream = ImageIO.createImageOutputStream(output);
try {
writer.setOutput(stream);
writer.write(metadata, new IIOImage(gridImage, null, metadata), writeParam);
} finally {
stream.close();
}
break;
}
}
public static void setDPI(IIOMetadata metadata) throws IIOInvalidTreeException {
// for PNG, it's dots per millimeter
double dotsPerMilli = 1.0 * DPI / 10 / 2.54;
IIOMetadataNode horiz = new IIOMetadataNode("HorizontalPixelSize");
horiz.setAttribute("value", Double.toString(dotsPerMilli));
IIOMetadataNode vert = new IIOMetadataNode("VerticalPixelSize");
vert.setAttribute("value", Double.toString(dotsPerMilli));
IIOMetadataNode dim = new IIOMetadataNode("Dimension");
dim.appendChild(horiz);
dim.appendChild(vert);
IIOMetadataNode root = new IIOMetadataNode("javax_imageio_1.0");
root.appendChild(dim);
metadata.mergeTree("javax_imageio_1.0", root);
}
}
DocFlavor myFormat = DocFlavor.INPUT_STREAM.PNG;
// Build a set of attributes
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
aset.add(MediaSizeName.ISO_A10);
aset.add(new MediaPrintableArea(0, 0, 35, 24, MediaPrintableArea.MM));
aset.add(PrintQuality.HIGH);
aset.add(new PrinterResolution(203, 203, PrinterResolution.DPI));
// adding other attributes
aset.add(OrientationRequested.PORTRAIT);
aset.add(new Copies(7));
aset.add(Fidelity.FIDELITY_TRUE);
import java.awt.EventQueue;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.ServiceUI;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import static javax.print.attribute.ResolutionSyntax.DPI;
import javax.print.attribute.standard.Copies;
import javax.print.attribute.standard.Fidelity;
import javax.print.attribute.standard.MediaPrintableArea;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.OrientationRequested;
import javax.print.attribute.standard.PrintQuality;
import javax.print.attribute.standard.PrinterResolution;
import javax.print.event.PrintJobEvent;
import javax.print.event.PrintJobListener;
import javax.print.event.PrintServiceAttributeEvent;
public class PNGPrintingExample {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
try {
FileInputStream imageFile = null;
imageFile = new FileInputStream("E:\\1-and-2-1.png");
BufferedImage input = ImageIO.read(imageFile);
File output = new File("E:\\To-Be-Printed.png");
saveGridImage(output,input);
imageFile = new FileInputStream(output);
// Set the document type
DocFlavor myFormat = DocFlavor.INPUT_STREAM.PNG;
// Build a set of attributes
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
// setting media size and printing media attributes
aset.add(MediaSizeName.ISO_A10);
aset.add(new MediaPrintableArea(0, 0, 35, 24, MediaPrintableArea.MM));
aset.add(PrintQuality.HIGH);
aset.add(new PrinterResolution(203, 203, PrinterResolution.DPI));
// adding some may be needed attibutes
aset.add(OrientationRequested.PORTRAIT);
aset.add(new Copies(7));
aset.add(Fidelity.FIDELITY_TRUE);
DocPrintJob job;
Doc myDoc = new SimpleDoc(imageFile, myFormat, null);
PrintService[] services =
PrintServiceLookup.lookupPrintServices(myFormat, null);
PrintService defaultPrintService = PrintServiceLookup
.lookupDefaultPrintService();
PrintService selectedPrintService =
ServiceUI.printDialog(null, 150, 150,
services, defaultPrintService, myFormat, aset);
if(selectedPrintService!=null)
{
System.out.println("selected printer:"
+selectedPrintService.getName());
try {
job = selectedPrintService.createPrintJob();
// Create a Doc
PrintJobListener pjlForP = new PrintJobListener() {
public void attributeUpdate(PrintServiceAttributeEvent e){
System.out.println("updated");
}
@Override
public void printJobNoMoreEvents(PrintJobEvent e){
System.out.println("may be sent to "+e.getPrintJob().getPrintService());
}
@Override
public void printDataTransferCompleted(PrintJobEvent pje) {
System.out.println("print Data Transfer Completed");
}
@Override
public void printJobCompleted(PrintJobEvent pje) {
System.out.println("The print job was completed");
}
@Override
public void printJobFailed(PrintJobEvent pje) {
System.out.println("The print job has failed");
}
@Override
public void printJobCanceled(PrintJobEvent pje) {
System.out.println("The print job was cancelled");
}
@Override
public void printJobRequiresAttention(PrintJobEvent pje) {
System.out.println("The print job require attention");
}
};
job.addPrintJobListener(pjlForP);
job.print(myDoc, aset);
imageFile.close();
} catch (PrintException ex) {
Logger.getLogger(BarcodePrintingFromJava.class.getName()).log(Level.SEVERE, null, ex);
}
}
else
System.out.println("selection cancelled");
} catch (FileNotFoundException ex) {
Logger.getLogger(BarcodePrintingFromJava.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(BarcodePrintingFromJava.class.getName()).log(Level.SEVERE, null, ex);
}
});
}
public static void saveGridImage(File output,BufferedImage gridImage) throws IOException {
output.delete();
final String formatName = "png";
for (Iterator<ImageWriter> iw = ImageIO.getImageWritersByFormatName(formatName); iw.hasNext();) {
ImageWriter writer = iw.next();
ImageWriteParam writeParam = writer.getDefaultWriteParam();
ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
IIOMetadata metadata = writer.getDefaultImageMetadata(typeSpecifier, writeParam);
if (metadata.isReadOnly() || !metadata.isStandardMetadataFormatSupported()) {
continue;
}
setDPI(metadata);
final ImageOutputStream stream = ImageIO.createImageOutputStream(output);
try {
writer.setOutput(stream);
writer.write(metadata, new IIOImage(gridImage, null, metadata), writeParam);
} finally {
stream.close();
}
break;
}
}
public static void setDPI(IIOMetadata metadata) throws IIOInvalidTreeException {
// for PNG, it's dots per millimeter
double dotsPerMilli = 1.0 * DPI / 10 / 2.54;
IIOMetadataNode horiz = new IIOMetadataNode("HorizontalPixelSize");
horiz.setAttribute("value", Double.toString(dotsPerMilli));
IIOMetadataNode vert = new IIOMetadataNode("VerticalPixelSize");
vert.setAttribute("value", Double.toString(dotsPerMilli));
IIOMetadataNode dim = new IIOMetadataNode("Dimension");
dim.appendChild(horiz);
dim.appendChild(vert);
IIOMetadataNode root = new IIOMetadataNode("javax_imageio_1.0");
root.appendChild(dim);
metadata.mergeTree("javax_imageio_1.0", root);
}
}
导入java.awt.EventQueue；
导入java.awt.image.buffereImage；
导入java.io.File；
导入java.io.FileInputStream；
导入java.io.FileNotFoundException；
导入java.io.IOException；
导入java.util.Iterator；
导入java.util.logging.Level；
导入java.util.logging.Logger；
导入javax.imageio.IIOImage；
导入javax.imageio.imageio；
导入javax.imageio.ImageTypeSpecifier；
导入javax.imageio.ImageWriteParam；
导入javax.imageio.ImageWriter；
导入javax.imageio.metadata.IIOInvalidTreeException；
导入javax.imageio.metadata.iimetadata；
导入javax.imageio.metadata.iimetadatanode；
导入javax.imageio.stream.ImageOutputStream；
导入javax.print.Doc；
导入javax.print.DocFlavor；
导入javax.print.DocPrintJob；
导入javax.print.PrintException；
导入javax.print.PrintService；
导入javax.print.PrintServiceLookup；
导入javax.print.ServiceUI；
导入javax.print.SimpleDoc；
导入javax.print.attribute.HashPrintRequestAttributeSet；
导入javax.print.attribute.PrintRequestAttributeSet；
导入静态javax.print.attribute.ResolutionSyntax.DPI；
导入javax.print.attribute.standard.Copies；
导入javax.print.attribute.standard.Fidelity；
导入javax.print.attribute.standard.MediaPrintableArea；
导入javax.print.attribute.standard.MediaSizeName；
导入javax.print.attribute.standard.orientationrequired；
导入javax.print.attribute.standard.PrintQuality；
导入javax.print.attribute.standard.PrinterResolution；
导入javax.print.event.PrintJobEvent；
导入javax.print.event.PrintJobListener；
导入javax.print.event.PrintServiceAttributeEvent；
公共类PNGPrintingExample{
/**
*@param指定命令行参数
*/
公共静态void main（字符串[]args）{
EventQueue.invokeLater（（）->{
试一试{
FileInputStream imageFile=null；
imageFile=newfileinputstream（“E:\\1-and-2-1.png”）；
BuffereImage输入=ImageIO.read（imageFile）；
文件输出=新文件（“E:\\To print.png”）；
saveGridImage（输出、输入）；
imageFile=新文件输入流（输出）；
//设置文档类型
DocFlavor myFormat=DocFlavor.INPUT\u STREAM.PNG；
//构建一组属性
PrintRequestAttributeSet aset=新的HashPrintRequestAttributeSet（）；
//设置介质大小和打印介质属性
aset.add（MediaSizeName.ISO_A10）；
aset.add（新的MediaPrintableArea（0,0,35,24，MediaPrintableArea.MM））；
aset.add（打印质量高）；
aset.add（新的PrinterResolution（203203，PrinterResolution.DPI））；
//可能需要添加一些属性
aset.add（要求方向。纵向）；
增加（新副本（7））；
aset.add（Fidelity.Fidelity\u TRUE）；
DocPrintJob；
Doc myDoc=new SimpleDoc（imageFile，myFormat，null）；
打印服务[]服务=
PrintServiceLookup.lookupPrintServices（myFormat，null）；
PrintService defaultPrintService=PrintServiceLookup
.lookupDefaultPrintService（）；
打印服务选择打印服务=
ServiceUI.printDialog（null、150、150、，
服务，defaultPrintService，myFormat，aset）；
如果（selectedPrintService！=null）
{
System.out.println（“所选打印机：”
+selectedPrintService.getName（））；
试一试{
job=selectedPrintService.createPrintJob（）；
//创建文档
PrintJobListener pjlForP=新的PrintJobListener（）{
公共无效属性更新（PrintServiceAttributeEvent e）{
系统输出打印项次（“更新”）；
}
@凌驾
public void printJobNoMoreEvents（PrintJobEvent e）{
System.out.println（“可能被发送到”+e.getPrintJob（）.getPrintService（））；
}
@凌驾
公共作废printDataTransferCompleted（PrintJobEvent pje）{
System.out.println（“打印数据传输完成”）；
}
@凌驾
公共作废打印作业已完成（打印作业事件pje）{