pdf转jpg

package effective.java;

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import javax.swing.SwingUtilities;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;

public class PdfToJpgTest {
    public static void setup() throws IOException {

        // load a pdf from a byte buffer
        File file = new File("D:\\workspace\\word2pdf\\src\\tests.doc.pdf");
        RandomAccessFile raf = new RandomAccessFile(file, "r");
        FileChannel channel = raf.getChannel();
        ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel
                .size());
        PDFFile pdffile = new PDFFile(buf);

        System.out.println("页数： " + pdffile.getNumPages());

        String getPdfFilePath = System.getProperty("user.dir") + "\\pdfPicFile";

        System.out.println("getPdfFilePath is  :" + getPdfFilePath);

        for (int i = 1; i <= pdffile.getNumPages(); i++) {
            // draw the first page to an image
            PDFPage page = pdffile.getPage(i);

            // get the width and height for the doc at the default zoom
            Rectangle rect = new Rectangle(0, 0, (int) page.getBBox()
                    .getWidth(), (int) page.getBBox().getHeight());

            // generate the image
            Image img = page.getImage(rect.width, rect.height, // width &
                    // height
                    rect, // clip rect
                    null, // null for the ImageObserver
                    true, // fill background with white
                    true // 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);

            // 输出到文件流
            FileOutputStream out = new FileOutputStream(getPdfFilePath + "\\"
                    + i + ".jpg");
            System.out.println("成功保存图片到:" + getPdfFilePath + "\\" + i + ".jpg");

            /*
             * JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
             * encoder.encode(tag); // JPEG编码 out.close();
             */

            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
            JPEGEncodeParam param2 = encoder.getDefaultJPEGEncodeParam(tag);
            param2.setQuality(1f, false);// 1f是提高生成的图片质量
            encoder.setJPEGEncodeParam(param2);
            encoder.encode(tag); // JPEG编码
            out.close();

        }

        // show the image in a frame
        // JFrame frame = new JFrame("PDF Test");
        // frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // frame.add(new JLabel(new ImageIcon(img)));
        // frame.pack();
        // frame.setVisible(true);
    }

    public static void main(final String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {
                    PdfToJpgTest.setup();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
    }

}
依赖的jar包
PDFRenderer.jar

评论

2 楼 woshixushigang 2011-09-03  

import java.awt.Color;
import java.io.ByteArrayOutputStream;
import java.net.URLEncoder;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.lowagie.text.Chunk;
import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.HeaderFooter;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Phrase;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;

/**
* @version 1.0.0
*/
public class ExportReportForPDF implements IExportReport {


/**
* @version 1.0.0
* @param HttpServletRequest request
* @param HttpServletResponse response
* @param Map<?,?> reportInfo 生成报表所需要的数据
*/
public void createReport(HttpServletRequest request,
HttpServletResponse response, Map<?,?> reportInfo) throws Exception {

//判断生成数据是否为空
if(reportInfo.get("cellInfo")==null){
throw new Exception("没有导出数据");
}

//设置文件响应信息
String showFileName =URLEncoder.encode(reportInfo.get("title") + ".pdf", "UTF-8");
showFileName = new String(showFileName.getBytes("iso8859-1"), "gb2312");

//定义输出类型
response.reset();
response.setContentType("application/pdf");
response.setHeader("Pragma", "public");
response.setHeader("Cache-Control", "max-age=30");
response.setHeader("Content-disposition", "attachment; filename="+ new String(showFileName.getBytes("gb2312"), "iso8859-1"));

//生成PDF文档
Document document = new Document(PageSize.A4, 36,36,36,36);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
PdfWriter.getInstance(document, bos);

//添加页眉
//HeaderFooter headerFooter = new HeaderFooter(new Phrase(),true); 
//headerFooter.setBorder(Rectangle.NO_BORDER);  
//headerFooter.setAlignment(Element.ALIGN_CENTER);  
//document.setHeader(headerFooter);

//添加页脚
HeaderFooter footer = new HeaderFooter(new Phrase("第 ",ReportFontFactory.getFontChinese(Font_Type.CONTENT)),new Phrase(" 页",ReportFontFactory.getFontChinese(Font_Type.CONTENT)));  
footer.setBorder(Rectangle.NO_BORDER);  
footer.setAlignment(Element.ALIGN_CENTER);  
document.setFooter(footer);  

//打开doc
document.open();

//添加标题
Paragraph paragraph=new Paragraph(""+reportInfo.get("title"),ReportFontFactory.getFontChinese(Font_Type.TITLE));
paragraph.setAlignment(Paragraph.ALIGN_CENTER);
document.add(paragraph);
document.add(Chunk.NEWLINE);

//构建一个表格
String [] header=(String[])reportInfo.get("header");
PdfPTable table = new PdfPTable(header.length);
        table.setWidthPercentage(90f);
        table.setHeaderRows(1);
PdfPCell cell =null;

//生成表头
for(int i=0;i<header.length;i++){
paragraph=new Paragraph(header[i],ReportFontFactory.getFontChinese(Font_Type.HEADER));
paragraph.setAlignment(Paragraph.ALIGN_CENTER);
cell= new PdfPCell(paragraph);
cell.setBackgroundColor(new Color(231,231,231));
table.addCell(cell);
}

//生成PDF数据
Object[][] datas=(Object[][])reportInfo.get("cellInfo");
for(int i=0;i<datas.length;i++){
Object[] datapdf=datas[i];
for(int j=0;j<datapdf.length;j++){
paragraph=new Paragraph(""+datapdf[j],ReportFontFactory.getFontChinese(Font_Type.CONTENT));
paragraph.setAlignment(Paragraph.ALIGN_CENTER);
    cell= new PdfPCell(paragraph);
table.addCell(cell);
}
    }

   //添加table到Document对象中
document.add(table);

   //关闭document
    document.close();
   
    //生成pdf文档品并响应客户端
response.setContentLength(bos.size());
ServletOutputStream out = response.getOutputStream();
response.setContentLength(bos.size());
bos.writeTo(out);
out.close();
out.flush();
bos.close();
bos.flush();

}
}

1 楼 qqdwll 2011-08-30  

请问下， 可以对PDF进行缩放转化吗？ 我查了下没找到相应处理的地方。