【使用Itext处理PDF文档（新建PDF文件、修改PDF文件、PDF中插入图片、将PDF文件转换为图片）】

iText简介

iText是著名的开放源码的站点sourceforge一个项目，是用于生成PDF文档的一个java类库。通过iText不仅可以生成PDF或rtf的文档，而且可以将XML、Html文件转化为PDF文件。 iText的安装非常方便，下载iText.jar文件后，只需要在系统的CLASSPATH中加入iText.jar的路径，在程序中就可以使用iText类库了。

 

1、包的引用

 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.net.MalformedURLException;
 import com.itextpdf.text.Document;
 import com.itextpdf.text.DocumentException;
 import com.itextpdf.text.Element;
 import com.itextpdf.text.Font;
 import com.itextpdf.text.Font.FontFamily;
 import com.itextpdf.text.Image;
 import com.itextpdf.text.PageSize;
 import com.itextpdf.text.Paragraph;
 import com.itextpdf.text.Phrase;
 import com.itextpdf.text.pdf.BaseFont;
 import com.itextpdf.text.pdf.ColumnText;
 import com.itextpdf.text.pdf.PdfContentByte;
 import com.itextpdf.text.pdf.PdfReader;
 import com.itextpdf.text.pdf.PdfStamper;
 import com.itextpdf.text.pdf.PdfWriter;

2、创建PDF文件

 public void createPDF()
     {
         try
         {
             String RESULT = "F:\\java56班\\eclipse-SDK-4.2-win32\\pdfiText.pdf";
             Document document = new Document();
             PdfWriter writer = PdfWriter.getInstance(document,
                     new FileOutputStream(RESULT));
             document.open();
             PdfContentByte canvas = writer.getDirectContentUnder();
             writer.setCompressionLevel();
             canvas.saveState(); // q
             canvas.beginText(); // BT
             canvas.moveText(, ); // 36 788 Td
             canvas.setFontAndSize(BaseFont.createFont(), ); // /F1 12 Tf
             // canvas.showText("Hello World"); // (Hello World)Tj
             canvas.showText("你好"); // (Hello World)Tj
             canvas.endText(); // ET
             canvas.restoreState(); // Q
             document.close();
         } catch (FileNotFoundException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (DocumentException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     public void createPDF2()
     {
         try
         {
             String RESULT = "F:\\java56班\\eclipse-SDK-4.2-win32\\pdfiText.pdf";
             Document document = new Document();
             PdfWriter writer = PdfWriter.getInstance(document,
                     new FileOutputStream(RESULT));
             document.open();
             writer.setCompressionLevel();
             // Phrase hello = new Phrase("Hello World");
             Phrase hello = new Phrase("你好");
             PdfContentByte canvas = writer.getDirectContentUnder();
             ColumnText.showTextAligned(canvas, Element.ALIGN_LEFT, hello, ,
                     , );
             document.close();
         } catch (FileNotFoundException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (DocumentException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     public void createPDF3()
     {
         try
         {
             String resource_jpg = "F:\\java56班\\eclipse-SDK-4.2-win32\\1.png";//
             String RESULT = "F:\\java56班\\eclipse-SDK-4.2-win32\\pdfiText.pdf";
             Paragraph p = new Paragraph("Foobar Film Festival", new Font(FontFamily.HELVETICA, ));
             p.setAlignment(Element.ALIGN_CENTER);
             Document document = new Document();//
             PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream(RESULT));
             document.open();
             document.add(p);
             Image img = Image.getInstance(resource_jpg);
             img.setAbsolutePosition(
                     (PageSize.POSTCARD.getWidth() - img.getScaledWidth()) / ,
                     (PageSize.POSTCARD.getHeight() - img.getScaledHeight()) / );

 //            img.setAbsolutePosition(0, 0);
             document.add(img);
             document.newPage();
             document.add(p);
             document.add(img);
             PdfContentByte over = writer.getDirectContent();
             over.saveState();
             float sinus = (float) Math.sin(Math.PI / );
             float cosinus = (float) Math.cos(Math.PI / );
             BaseFont bf = BaseFont.createFont();
             over.beginText();
             over.setTextRenderingMode(PdfContentByte.TEXT_RENDER_MODE_FILL_STROKE);
             over.setLineWidth(1.5f);
             over.setRGBColorStroke(0xFF, 0x00, 0x00);
             over.setRGBColorFill(0xFF, 0xFF, 0xFF);
             over.setFontAndSize(bf, );
             over.setTextMatrix(cosinus, sinus, -sinus, cosinus, , );
             over.showText("SOLD OUT");
             over.endText();
             over.restoreState();
             PdfContentByte under = writer.getDirectContentUnder();
             under.saveState();
             under.setRGBColorFill(0xFF, 0xD7, 0x00);
             under.rectangle(, , PageSize.POSTCARD.getWidth() - ,
                     PageSize.POSTCARD.getHeight() - );
             under.fill();
             under.restoreState();

             document.close();
         } catch (FileNotFoundException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (DocumentException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (MalformedURLException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

3、在绝对位置插入图片

 public void addImageAbsolu()
     {
         try
         {
             String resource_jpg = "F:\\java56班\\eclipse-SDK-4.2-win32\\1.png";//
             String RESULT = "F:\\java56班\\eclipse-SDK-4.2-win32\\pdfiText.pdf";
             Document document = new Document();
             PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream(RESULT));
             document.open();
 //            PDPage page = (PDPage)doc.getDocumentCatalog().getAllPages().get( 0 );
             Image img = Image.getInstance(resource_jpg);
             img.setAbsolutePosition(
                     (PageSize.POSTCARD.getWidth() - img.getScaledWidth()) / ,
                     (PageSize.POSTCARD.getHeight() - img.getScaledHeight()) / );

 //            img.setAbsolutePosition(0, 0);
             document.add(img);
             document.close();
         } catch (FileNotFoundException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (DocumentException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (MalformedURLException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     public void addImageAbsolu2()
     {
         try
         {
             String resource_jpg = "F:\\java56班\\eclipse-SDK-4.2-win32\\1.png";//
             String result = "F:\\java56班\\eclipse-SDK-4.2-win32\\pdfiText.pdf";
             String result2 = "F:\\java56班\\eclipse-SDK-4.2-win32\\pdfiText2.pdf";
             //创建一个pdf读入流
             PdfReader reader = new PdfReader(result);
             //根据一个pdfreader创建一个pdfStamper.用来生成新的pdf.
             PdfStamper stamper = new PdfStamper(reader,new FileOutputStream(result2));
             //获得pdfstamper在当前页的上层打印内容.也就是说 这些内容会覆盖在原先的pdf内容之上.
             PdfContentByte over = stamper.getOverContent(); 

             Document document = new Document();
             PdfWriter writer = PdfWriter.getInstance(document,new FileOutputStream(result));
             document.open();
 //            PDPage page = (PDPage)doc.getDocumentCatalog().getAllPages().get( 0 );
             Image img = Image.getInstance(resource_jpg);
             img.setAbsolutePosition(, );
             document.add(img);
             document.close();
         } catch (FileNotFoundException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (DocumentException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (MalformedURLException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

4、PDF文件转换为图片

package demo1;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.util.ImageIOUtil;

import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;

public class PdfPageToImg
{

    /**
     * PDFBOX转图片
     *
     * @param pdfUrl
     *            pdf的路径
     * @param imgTempUrl
     *            图片输出路径
     */
    public static void pdfToImage(String pdfUrl, String imgTempUrl)
    {
        try
        {
            // 读入PDF
            PdfReader pdfReader = new PdfReader(pdfUrl);
            // 计算PDF页码数
            int pageCount = pdfReader.getNumberOfPages();
            // 循环每个页码
            for (int i = pageCount; i >= pdfReader.getNumberOfPages(); i--)
            {
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                PdfStamper pdfStamper = null;
                PDDocument pdDocument = null;

                pdfReader = new PdfReader(pdfUrl);
                pdfReader.selectPages(String.valueOf(i));
                pdfStamper = new PdfStamper(pdfReader, out);
                pdfStamper.close();
                // 利用PdfBox生成图像
                pdDocument = PDDocument.load(new ByteArrayInputStream(out
                        .toByteArray()));
                OutputStream outputStream = new FileOutputStream(imgTempUrl
                        + "ImgName" + "-" + i + ".bmp");

                ImageOutputStream output = ImageIO
                        .createImageOutputStream(outputStream);
                PDPage page = (PDPage) pdDocument.getDocumentCatalog()
                        .getAllPages().get();
                BufferedImage image = page.convertToImage(
                        BufferedImage.TYPE_INT_RGB, );
                ImageIOUtil.writeImage(image, "bmp", outputStream, );
                if (output != null)
                {
                    output.flush();
                    output.close();
                }
                pdDocument.close();
            }
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public static void main(String[] args)
    {
        String pdfUrl = "F:\\java56班\\eclipse-SDK-4.2-win32\\iText入门基础教程[2].pdf";
        String imgTempUrl = "F:\\java56班\\eclipse-SDK-4.2-win32\\img\\";
        pdfToImage(pdfUrl, imgTempUrl);
    }
}

5、图片集转换为PDF文件

 package demo1;

 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import com.itextpdf.text.Document;
 import com.itextpdf.text.DocumentException;
 import com.itextpdf.text.Image;
 import com.itextpdf.text.Rectangle;
 import com.itextpdf.text.pdf.PdfWriter;

 public class ImgToPDF
 {

     /**
      *
      * @param destPath
      *            生成pdf文件的路劲
      * @param images
      *            需要转换的图片路径的数组
      * @throws IOException
      * @throws DocumentException
      */
     public static void imagesToPdf(String destPath, String imagesPath)
     {
         try
         {
             // 第一步：创建一个document对象。
             Document document = new Document();
             document.setMargins(, , , );
             // 第二步：
             // 创建一个PdfWriter实例，
             PdfWriter.getInstance(document, new FileOutputStream(destPath));
             // 第三步：打开文档。
             document.open();
             // 第四步：在文档中增加图片。
             File files = new File(imagesPath);
             String[] images = files.list();
             int len = images.length;

             for (int i = ; i < len; i++)
             {
                 if (images[i].toLowerCase().endsWith(".bmp"))
                 {
                     String temp = imagesPath + "\\" + images[i];
                     Image img = Image.getInstance(temp);
                     img.setAlignment(Image.ALIGN_CENTER);
                     // 根据图片大小设置页面，一定要先设置页面，再newPage（），否则无效
                     document.setPageSize(new Rectangle(img.getWidth(), img
                             .getHeight()));
                     document.newPage();
                     document.add(img);
                 }
             }
             // 第五步：关闭文档。
             document.close();
         } catch (Exception e)
         {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }

     public static void main(String[] args)
     {
         String destPath = "F:\\java56班\\eclipse-SDK-4.2-win32\\img\\imagesToPdf.pdf";
         String imagesPath = "F:\\java56班\\eclipse-SDK-4.2-win32\\img\\";
         imagesToPdf(destPath, imagesPath);
     }

 }

2015-01-26