来自Pedro的问题（我不知道如何引用它）：“有了这个库，我将不得不更改将数据发送到proyect中的打印机的方式，对吗？”
回答您的最后一条评论，我认为不完全适合混合来自不同库的调用，但是，偶尔可能会发生这种情况……放手，在发送图像之前，我们需要对齐hello
world示例//认为要向热敏打印机（ESC / POS）发送问候语，您可以用这种方式编写代码。有了这个种子，您可以根据需要输入新的ESC /
POS命令。如果您的旧代码可以嵌入到此示例中，那么您的问题的答案是肯定的，escpos_coffee库与OutputStream一起使用，并且可以像下面的示例中那样以静默方式嵌入。此代码使用escpos_coffee
package pedrojoaquim;import escpos.EscPos;import escpos.image.BitonalThreshold;import escpos.image.EscPosImage;import escpos.image.RasterBitImageWrapper;import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.IOException;import java.util.logging.Level;import java.util.logging.Logger;import javax.imageio.ImageIO;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.SimpleDoc;public class PedroJoaquim { public void printImage() throws PrintException, IOException{ String text_to_print = "Hello world!"; PrintService foundService = PrintServiceLookup.lookupDefaultPrintService(); DocPrintJob dpj = foundService.createPrintJob(); ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); /// your legacy commands ini // initialize printer outputStream.write(27); // ESC outputStream.write('@'); // print text outputStream.write(text_to_print.getBytes()); // feed 5 lines outputStream.write(27); // ESC outputStream.write('d'); outputStream.write(5); // cut paper outputStream.write(29); // GS outputStream.write('V'); outputStream.write(48); /// your legacy commands end /// fitting lib calls on same outputStream EscPos escpos = new EscPos(outputStream); RasterBitImageWrapper imageWrapper = new RasterBitImageWrapper(); BufferedImage githubBufferedImage = ImageIO.read(new File("/Users/marco/Downloads/smile.jpg")); EscPosImage escposImage = new EscPosImage(githubBufferedImage, new BitonalThreshold()); // print smile image... escpos.write(imageWrapper, escposImage); // lib end /// legacy continues from this point // print text outputStream.write(" Joaquim's Smile image".getBytes()); // feed 5 lines outputStream.write(27); // ESC outputStream.write('d'); outputStream.write(5); // cut outputStream.write(29); // GS outputStream.write('V'); outputStream.write(48); // do not forguet to close outputstream outputStream.close(); ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray()); DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE; Doc doc = new SimpleDoc(inputStream, flavor, null); dpj.print(doc, null); } public static void main(String[] args) throws IOException { PedroJoaquim obj = new PedroJoaquim(); try { obj.printImage(); } catch (PrintException ex) { Logger.getLogger(PedroJoaquim.class.getName()).log(Level.SEVERE, null, ex); } }}
