我正在处理需要从PdfFile创建PDFImags的项目，因为我正在使用PDFRendere API。我的程序运行成功，当Pdf文件大小很小，如104 kb，180 kb，421 kb等，但我得到“线程中的异常”Image Fetcher 0“* java.lang.OutOfMemoryError：Java堆空间 “ *当PdfFile尺寸大约或大于12 mb，13 mb，20 mb时。 我在Windows XP，Windows2003服务器和Linux操作系统上检查它，并且还增加了大约1024 MB的Java堆大小，但我仍然得到 java.lang.OutOfMemoryError：Java堆空间。 我的代码是
try {
pdfFileName = pdfFileName.trim();
if (pdfFileName != null || !(pdfFileName.equals(""))) {
lastIndexx = pdfFileName.lastIndexOf('.');
if (lastIndexx < 0) // if extension not present, concatenate the extension
{
filePath = pdfPath+ pdfFileName + ".pdf";
} else {
filePath = pdfPath+ pdfFileName;
pdfFileName = pdfFileName.substring(0, lastIndexx);
}
System.out.println("Pdf system's redefine physical path, where pdfFile are stored, from PdfController.java : " +filePath);
file = new File(filePath);
raf = new RandomAccessFile(file, "r");
channel = raf.getChannel();
byteBuf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
System.out.println("PdfFile Name before Trim() :" + pdfFileName + ":");
// get a pdf file when pdf is password protected.
byte[] bytePassword = pdfFileName.trim()).getBytes();
pdfPassword = new PDFPassword(bytePassword);
pdffile = new PDFFile(byteBuf, pdfPassword);
// draw the image of particular page
dpage = pdffile.getPage(pageNo);
//get the width and height for the doc at the default zoom
rect = new Rectangle(0, 0, (int) dpage.getBBox().getWidth(), (int) dpage.getBBox().getHeight());
//Rectangle rect = new Rectangle(0,0, 200, 300);
//BufferedImage bufferedImage = new BufferedImage(rect.width, rect.height, BufferedImage.TYPE_INT_RGB);
bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//generate the image
img = dpage.getImage(
//rect.width, rect.height, //width & height
width, height, // hardcoded in jsp
rect, // clip rect
null, // null for the ImageObserver
true, // fill background with white
true // block until drawing is done
);
bufImageGraphics = bufferedImage.createGraphics();
bufImageGraphics.drawImage(img, 0, 0, null);
ImageIO.write(bufferedImage, "jpg", new File(directoryName + "//" + pdfFileName + "_" + pageNo + ".jpg"));
succ = true;
} /*catch (OutOfMemoryError ex) {
System.out.println("From showPdfMetaData.jsp, OutOfMemoryError, Message : " + ex.getMessage());
System.out.println("From showPdfMetaData.jsp, OutOfMemoryError, Message : " + ex.getCause());
//errorType = "Jvm throw OutOfMemoryError";
}*/catch (MethodNotFoundException ex) {
System.out.println("From pdfToImage(), MethodNotFoundException, Message : " + ex.getMessage());
System.out.println("From pdfToImage(), MethodNotFoundException, Message : " + ex.getCause());
System.out.println("pdfFileName, from pdfToImage(), MethodNotFoundException: " + pdfFileName);
succ = false;
} catch (StringIndexOutOfBoundsException e) {
System.out.println("from pdfToImage(), StringIndexOutOfBoundsException !!!");
System.out.println("pdfFileName, from pdfToImage(), StringIndexOutOfBoundsException: " + pdfFileName);
e.printStackTrace();
succ = false;
} catch (FileNotFoundException e) {
System.out.println("from pdfToImage(), FileNotFoundException !!!");
System.out.println("pdfFileName, from pdfToImage(), FileNotFoundException: " + pdfFileName);
e.printStackTrace();
succ = false;
} catch (IOException e) {
System.out.println("from pdfToImage(), IOException !!!");
System.out.println("pdfFileName, from pdfToImage(), IOException: " + pdfFileName);
e.printStackTrace();
succ = false;
} catch (NullPointerException e) {
System.out.println("from pdfToImage(), NullPointerException !!!");
System.out.println("pdfFileName, from pdfToImage(), NullPointerException: " + pdfFileName);
e.printStackTrace();
succ = false;
} catch (Exception e) {
System.out.println("from pdfToImage(), General Exception !!!");
System.out.println("pdfFileName, from pdfToImage(), Exception: " + pdfFileName);
e.printStackTrace();
succ = false;
} finally {
if (raf != null) {
byteBuf.clear();
channel.close();
raf.close();
}
if(bufferedImage !=null){
bufferedImage.flush();
//bufImageGraphics.finalize();
}
if(bufImageGraphics !=null){
bufImageGraphics.dispose();
}
if(pdfPassword !=null){
pdfPassword = null;
}
if(dpage !=null){
dpage = null;
}
if(rect !=null){
rect = null;
}if(img !=null){
img.flush();
img = null;
}if(dmsMgmt !=null){
dmsMgmt = null;
}
}
return succ;
}
当我调试程序时，它会在
处抛出内存错误img = dpage.getImage(
//rect.width, rect.height, //width & height
width, height,
rect, // clip rect
null, // null for the ImageObserver
true, // fill background with white
true // block until drawing is done
);
我从jsp调用这个方法。所以请告诉我任何可能的建议。 在此先感谢，我为任何错误的原因感到抱歉，因为这是我在这里的第一个问题...如果问错误的话，我会尽量不重复
答案 0 :(得分：3)
java.lang.OutOfMemoryError至少有两个可能的原因：Java堆空间。