我只是java中的初学者
我尝试使用 apache poi 和 Itext 库将PPT文件转换为PDF文件,但我收到 NoSuchMethodError <的错误/ p>
我尝试了所有版本的Apache poi和poi-ooxml,但我得到了相同的错误 请帮我找出此错误的解决方法
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.hslf.model.Slide;
import org.apache.poi.hslf.usermodel.SlideShow;
import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
public class PPTtoPDF {
public PPTtoPDF() {
}
@SuppressWarnings("resource")
public void convertPPTToPDF(String sourcepath, String destinationPath) throws Exception {
FileInputStream inputStream = new FileInputStream(sourcepath);
double zoom = 2;
AffineTransform at = new AffineTransform();
at.setToScale(zoom, zoom);
Document pdfDocument = new Document();
PdfWriter pdfWriter = PdfWriter.getInstance(pdfDocument, new FileOutputStream(destinationPath));
PdfPTable table = new PdfPTable(1);
pdfWriter.open();
pdfDocument.open();
Dimension pgsize = null;
Image slideImage = null;
BufferedImage img = null;
SlideShow ppt = new SlideShow(inputStream);
pgsize = ppt.getPageSize();
Slide slide[] = ppt.getSlides();
System.out.println("Length----> "+slide.length);
pdfDocument.setPageSize(new Rectangle((float) pgsize.getWidth(), (float) pgsize.getHeight()));
pdfWriter.open();
pdfDocument.open();
for (int i = 0; i < slide.length; i++) {
img = new BufferedImage((int) Math.ceil(pgsize.width * zoom), (int) Math.ceil(pgsize.height * zoom), BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
graphics.setTransform(at);
graphics.setPaint(Color.white);
graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
slide[i].draw(graphics);
graphics.getPaint();
slideImage = Image.getInstance(img, null);
table.addCell(new PdfPCell(slideImage, true));
System.out.println(table);
}
pdfDocument.add(table);
pdfDocument.close();
pdfWriter.close();
System.out.println("Powerpoint file converted to PDF successfully");
}
public static void main(String[] args) throws Exception
{
PPTtoPDF pp = new PPTtoPDF();
pp.convertPPTToPDF("D:\\tp\\slides.ppt", "D:\\tp\\1.pdf");
}
}
,错误是
Exception in thread "main" java.lang.NoSuchMethodError: org.apache.poi.POIDocument.<init>(Lorg/apache/poi/poifs/filesystem/DirectoryNode;Lorg/apache/poi/poifs/filesystem/POIFSFileSystem;)V
at org.apache.poi.hslf.HSLFSlideShow.<init>(HSLFSlideShow.java:134)
at org.apache.poi.hslf.HSLFSlideShow.<init>(HSLFSlideShow.java:120)
at org.apache.poi.hslf.HSLFSlideShow.<init>(HSLFSlideShow.java:107)
at org.apache.poi.hslf.usermodel.SlideShow.<init>(SlideShow.java:122)
at convertService.PPTtoPDF.convertPPTToPDF(PPTtoPDF.java:44)
at convertService.PPTtoPDF.main(PPTtoPDF.java:75)
答案 0 :(得分:1)
参见Apache POI FAQ entry on this very topic.几乎可以肯定的是,你已经在你的类路径中添加了一个新的POI副本,但旧的版本已经存在(来自之前的需求,你的框架等),Java是现在对使用哪一个感到困惑。
您可以使用工具:
(https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool)
jdeps是自JDK 8以来为开发人员添加的新命令行工具 用于理解其应用程序的静态依赖性 库。 jdeps是给定类文件的静态分析工具