Added Zebra print util for direct print a pdf file

build.gradle

@@ -31,6 +31,8 @@ dependencies {
 	implementation 'org.springframework.security:spring-security-ldap'
 	implementation 'org.liquibase:liquibase-core'
 	implementation 'com.google.code.gson:gson:2.8.5'
+    implementation("org.apache.pdfbox:pdfbox:2.0.29")
+    implementation("org.apache.pdfbox:fontbox:2.0.34")
 
 //	// https://mvnrepository.com/artifact/org.springdoc/springdoc-openapi-starter-webmvc-ui
 //	implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.8")

src/main/java/com/ffii/core/utils/ZebraPrinterUtil.kt

@@ -0,0 +1,109 @@
+package com.ffii.core.utils
+
+import org.apache.pdfbox.pdmodel.PDDocument
+import org.apache.pdfbox.rendering.PDFRenderer
+import org.apache.pdfbox.rendering.ImageType
+import java.awt.image.BufferedImage
+import java.io.File
+import java.io.OutputStream
+import java.net.Socket
+import java.util.*
+
+/**
+ * Utility class for generating and sending print jobs to a Zebra printer using ZPL.
+ * This class requires the 'org.apache.pdfbox:pdfbox' dependency to be included in your project.
+ */
+open class ZebraPrinterUtil {
+
+    companion object {
+
+        /**
+         * Converts the first page of a PDF document into a ZPL command and sends it to the specified printer.
+         *
+         * @param pdfFile The PDF file to be printed.
+         * @param printerIp The IP address of the Zebra printer.
+         * @param printerPort The port of the Zebra printer, typically 9100.
+         * @throws Exception if there is an error during file processing or printing.
+         */
+        @JvmStatic
+        fun printPdfToZebra(pdfFile: File, printerIp: String, printerPort: Int) {
+
+            // Check if the file exists and is readable
+            if (!pdfFile.exists() || !pdfFile.canRead()) {
+                throw IllegalArgumentException("Error: File not found or not readable at path: ${pdfFile.absolutePath}")
+            }
+
+            try {
+                // 1. Load the PDF document
+                PDDocument.load(pdfFile).use { document ->
+                    val renderer = PDFRenderer(document)
+
+                    // 2. Render the first page of the PDF as a monochrome image
+                    // The '300 / 72f' scales the image to 300 DPI.
+                    val image = renderer.renderImage(0, 300 / 72f, ImageType.BINARY)
+
+                    // 3. Convert the image to a ZPL format string
+                    val zplCommand = convertImageToZpl(image)
+
+                    // 4. Send the ZPL command to the printer via a network socket
+                    val printData = zplCommand.toByteArray()
+                    Socket(printerIp, printerPort).use { socket ->
+                        val os: OutputStream = socket.getOutputStream()
+                        os.write(printData)
+                        os.flush()
+                    }
+                }
+            } catch (e: Exception) {
+                // Re-throw the exception with a more descriptive message
+                throw Exception("Error processing print job for PDF: ${e.message}", e)
+            }
+        }
+
+        /**
+         * Converts a BufferedImage (monochrome) to a ZPL string using the ^GFA command.
+         * This function handles the conversion of pixel data to a compressed hex string.
+         *
+         * @param image The BufferedImage to convert.
+         * @return A ZPL-formatted string ready to be sent to the printer.
+         */
+        private fun convertImageToZpl(image: BufferedImage): String {
+            val zpl = StringBuilder()
+            zpl.append("^XA\n")
+
+            val width = image.width
+            val height = image.height
+
+            // ZPL format for a graphical image is ^GFA
+            val bytesPerRow = (width + 7) / 8
+            val totalBytes = bytesPerRow * height
+
+            zpl.append("^FO0,0^GFA,").append(totalBytes).append(",").append(totalBytes).append(",").append(bytesPerRow).append(",")
+
+            // Extract pixel data and convert to ZPL hex string
+            for (y in 0 until height) {
+                val rowBits = BitSet(width)
+                for (x in 0 until width) {
+                    // Check for a black pixel (0xFF000000 in ARGB)
+                    if (image.getRGB(x, y) == 0xFF000000.toInt()) {
+                        rowBits.set(x)
+                    }
+                }
+
+                for (i in 0 until bytesPerRow) {
+                    var byteValue = 0
+                    for (bit in 0 until 8) {
+                        if (rowBits.get(i * 8 + bit)) {
+                            byteValue = byteValue or (1 shl (7 - bit))
+                        }
+                    }
+                    zpl.append(String.format("%02X", byteValue))
+                }
+            }
+
+            zpl.append("^FS\n")
+            zpl.append("^XZ\n")
+
+            return zpl.toString()
+        }
+    }
+}