pdf转曲
pdf去白边

package cn.net.haotuo.pojo;import com.itextpdf.text.Document;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.*;import java.io.*;public class GhostscriptExample {public static String gsPath = "C:/Program Files/gs/gs9.54.0/bin/gswin64c.exe";public static void main(String[] args) throws IOException {String inputFilePath = "C:\\Users\\Administrator\\Desktop\\2535.pdf";try {float pt = 72f/25.4f;String quchubaibian = quchubaibian(inputFilePath);PdfReader reader = new PdfReader(quchubaibian);String outPath  = quchubaibian.replaceAll("ok.pdf","白.pdf");Rectangle boxSize = reader.getBoxSize(1, "art");Document document = new Document(new Rectangle(boxSize.getWidth(), boxSize.getHeight()));FileOutputStream outputStream = new FileOutputStream(outPath);//新建一个pdf文档;PdfWriter writer = PdfWriter.getInstance(document, outputStream);//把新建的pdf 赋值给 documentwriter.setBoxSize("trim",boxSize);writer.setPdfVersion(PdfWriter.VERSION_1_5);document.open();//打开 document文档PdfContentByte cb = writer.getDirectContent();for(int i=1;i<=reader.getNumberOfPages();i++){PdfImportedPage importedPage = writer.getImportedPage(reader, i);Rectangle boxSizeTemp = reader.getBoxSize(i, "art");Rectangle rectangle = new Rectangle(0,0,boxSizeTemp.getWidth(),boxSizeTemp.getHeight());document.setPageSize(rectangle);document.newPage();cb.addTemplate(importedPage,-boxSizeTemp.getLeft(),-boxSizeTemp.getBottom());}outputStream.flush();//关闭文件document.close();//关闭文件outputStream.close();//关闭文件reader.close();} catch (Exception e) {e.printStackTrace();}}public static String quchubaibian(String pdfPath){String outPath = pdfPath.substring(0,pdfPath.length()-4)+"_ok.pdf";StringBuffer stringBuffer = new StringBuffer();stringBuffer.append(gsPath);stringBuffer.append(" -o " + outPath);stringBuffer.append(" -sDEVICE=pdfwrite -dFIXEDMEDIA -dPDFFitPage -c \"<</AutoRotatePages=/None>> setpagedevice\"");stringBuffer.append(" -f " + pdfPath);GhostscriptExample.run(stringBuffer.toString());return outPath;}/*** pdf转曲* @param pdfPath*/public static void zhuanqu(String pdfPath){String outPath = pdfPath.substring(0,pdfPath.length()-4)+"_ok.pdf";StringBuffer stringBuffer = new StringBuffer();stringBuffer.append(gsPath);stringBuffer.append(" -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dNoOutputFonts");stringBuffer.append(" -sOutputFile=" + outPath);stringBuffer.append(" -f " + pdfPath);GhostscriptExample.run(stringBuffer.toString());}public static String pdf2ps(String pdfPath){String ps = pdfPath.substring(0,pdfPath.length()-3)+"ps";StringBuffer stringBuffer = new StringBuffer();stringBuffer.append(gsPath);stringBuffer.append(" -dNOPAUSE -dBATCH -sDEVICE=ps2write -dFILTERTEXT");stringBuffer.append(" -sOutputFile=" + ps);stringBuffer.append(" -f " + pdfPath);GhostscriptExample.run(stringBuffer.toString());return ps;}/*** 导出jpg** @param pdfPath 输入pdf文件* @param outPath 输出jpg路径* @param dJPEGQ  jpg质量 0-100*/public static void exportJpg(String pdfPath, String outPath, String dpi, String dJPEGQ) {StringBuffer stringBuffer = new StringBuffer();stringBuffer.append(gsPath);stringBuffer.append(" -dNOPAUSE -dBATCH -sDEVICE=jpeg");stringBuffer.append(" -r" + dpi);stringBuffer.append(" -dJPEGQ=" + dJPEGQ);stringBuffer.append(" -sOutputFile=" + outPath);stringBuffer.append(" -f " + pdfPath);GhostscriptExample.run(stringBuffer.toString());}/*** 导出png** @param pdfPath pdf路径* @param outPath 输出png路径* @param dpi     分辨率*/public static void exportPng(String pdfPath, String outPath, String dpi) {/*** gsPath: Ghostscript 执行文件的路径* -dNOPAUSE: 防止 Ghostscript 在每一页处理完成后暂停等待用户操作* -dBATCH: 让 Ghostscript 在处理完最后一页后退出而不是等待新的输入* -sDEVICE=png16m: 指定输出设备为 PNG16m 格式。PNG16m 是一种支持多种颜色深度的 PNG 图像格式，其具有较高的图像质量。*      -sDEVICE=png16m 表示png-24 较大*      -sDEVICE=png256 表示png-8 较小*/StringBuffer stringBuffer = new StringBuffer();stringBuffer.append(gsPath);stringBuffer.append(" -dNOPAUSE -dBATCH -sDEVICE=png16m");stringBuffer.append(" -r" + dpi);stringBuffer.append(" -sOutputFile=" + outPath);stringBuffer.append(" -f " + pdfPath);GhostscriptExample.run(stringBuffer.toString());}public static void run(String command) {System.out.println(command);try {Process process = Runtime.getRuntime().exec(command);int exitCode = process.waitFor();if (exitCode == 0) {System.out.println("Conversion successful!");} else {System.out.println("Conversion failed with error code: " + exitCode);InputStream errorStream = process.getErrorStream();BufferedReader errorReader = new BufferedReader(new InputStreamReader(errorStream));String line;while ((line = errorReader.readLine()) != null) {System.out.println(line);}}} catch (IOException | InterruptedException e) {e.printStackTrace();}}
}