本文主要是介绍java实现Img与PDF相互转换，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
不善于表达，就直接贴出代码吧。请大牛忽视我.................import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;import com.Utils.ImgFileTool;
import com.lowagie.text.Document;
import com.lowagie.text.Image;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;/*** * @author hubiao* @dateTime 2014-06-07* 本工具对实现对IMG与PDF相互转换。* 运行测试需要导入以下2个jar包* itext-2.0.2.jar * PDFRenderer.jar**/
@SuppressWarnings("unused")
public class ImgPdfUtils {public static void main(String[] args) throws Exception {//PDF包提取 pdf//pdfExtraction();//pdf转jpg//pdfToJpg("E:\\java\\资料pdf\\1.pdf","E:\\java\\资料pdf\\1.jpg",1);//将多个jpg直接合并成pdf包//extractionPdf("F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img","F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img.pdf");//jpg转pdf//jpgToPdf();//文件排序//listOrder();ImgFileTool.imgMerageToPdf(new File("F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img").listFiles(),new File("F:\\temp\\Project\\数据\\dfdsfds\\","巴黎公社活动家传略.pdf"));}private static void listOrder() {File[] listFiles = new File("F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img").listFiles();TreeMap<Integer, File> tree = new TreeMap<Integer, File>();for(File f : listFiles){tree.put(Integer.parseInt(f.getName().replaceAll(".jpg$", "")), f);}for(Entry<Integer, File> eif : tree.entrySet()){System.out.println(eif.getKey()+"="+eif.getValue().toString());}}/** * @param list 图片集合* @param file 保存路径* @return true,合并完成* 如果文件名不是1.jpg，2.jpg，3.jpg，4.jpg这样的。则需要自己重写TreeMap的排序方式！*/public static boolean imgMerageToPdf(File[] list, File file)throws Exception {//1：对图片文件通过TreeMap以名称进行自然排序Map<Integer,File> mif = new TreeMap<Integer,File>();for(File f : list)mif.put(Integer.parseInt(f.getName().replaceAll(".jpg$", "")), f);//2：获取第一个Img的宽、高做为PDF文档标准ByteArrayOutputStream baos = new ByteArrayOutputStream(2048*3);InputStream is = new FileInputStream(mif.get(1));for(int len;(len=is.read())!=-1;)baos.write(len);baos.flush();Image image = Image.getInstance(baos.toByteArray());float width = image.width();float height = image.height();baos.close();//3:通过宽高 ，实例化PDF文档对象。Document document = new Document(new Rectangle(width,height));PdfWriter pdfWr = PdfWriter.getInstance(document, new FileOutputStream(file));document.open();//4：获取每一个图片文件，转为IMG对象。装载到Document对象中for(Entry<Integer,File> eif : mif.entrySet()){//4.1:读取到内存中baos = new ByteArrayOutputStream(2048*3);is = new FileInputStream(eif.getValue());for(int len;(len=is.read())!=-1;)baos.write(len);baos.flush();//4.2通过byte字节生成IMG对象image = Image.getInstance(baos.toByteArray());Image.getInstance(baos.toByteArray());image.setAbsolutePosition(0.0f, 0.0f);//4.3：添加到document中document.add(image);document.newPage();baos.close();}//5：释放资源document.close();pdfWr.close();return true;}/*** * @param source 源文件* @param target 目标文件* @param x 读取源文件中的第几页*/private static void pdfToJpg(String source,String target,int x) throws Exception {//创建从中读取和向其中写入（可选）的随机访问文件流，R表示对其只是访问模式RandomAccessFile rea = new RandomAccessFile(new File(source), "r");//将流读取到内存中，然后还映射一个PDF对象FileChannel channel = rea.getChannel();ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY,0, channel.size());PDFFile pdfFile = new PDFFile(buf);PDFPage page = pdfFile.getPage(x); // get the width and height for the doc at the default zoom java.awt.Rectangle rect = new java.awt.Rectangle(0, 0, (int) page.getBBox() .getWidth(), (int) page.getBBox().getHeight()); // generate the image java.awt.Image img = page.getImage(rect.width, rect.height, // width &rect, // clip rectnull, // null for the ImageObservertrue, // fill background with whitetrue // block until drawing is done); BufferedImage tag = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_RGB); tag.getGraphics().drawImage(img, 0, 0, rect.width, rect.height, null); FileOutputStream out = new FileOutputStream(target); // 输出到文件流 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); encoder.encode(tag); // JPEG编码 out.close(); }/*** @param source 源PDF文件路径* @param target 保存PDF文件路径* @param pageNum 提取PDF中第pageNum页* @throws Exception */private static void pdfExtraction(String source,String target,int pageNum) throws Exception{//1：创建PDF读取对象PdfReader pr = new PdfReader(source);System.out.println("this document "+pr.getNumberOfPages()+" page");//2：将第page页转为提取，创建document对象Document doc = new Document(pr.getPageSize(pageNum));//3：通过PdfCopy转其单独存储PdfCopy copy = new PdfCopy(doc, new FileOutputStream(new File(target)));doc.open();doc.newPage();//4：获取第1页，装载到document中。PdfImportedPage page = copy.getImportedPage(pr,pageNum);copy.addPage(page); //5：释放资源copy.close();doc.close();pr.close();}/*** @param pdfFile 源PDF文件* @param imgFile 图片文件*/private static void jpgToPdf(File pdfFile,File imgFile) throws Exception {//文件转imgInputStream is = new FileInputStream(pdfFile);ByteArrayOutputStream baos = new ByteArrayOutputStream();for(int i;(i=is.read())!=-1;){baos.write(i);}baos.flush();//取得图像的宽和高。Image img = Image.getInstance(baos.toByteArray());float width = img.width();float height = img.height();img.setAbsolutePosition(0.0F, 0.0F);//取消偏移System.out.println("width = "+width+"\theight"+height);//img转pdfDocument doc = new Document(new Rectangle(width,height));PdfWriter pw = PdfWriter.getInstance(doc,new FileOutputStream(imgFile));doc.open();doc.add(img);//释放资源System.out.println(doc.newPage());pw.flush();baos.close();doc.close();pw.close();}}
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