Question

我正在使用 Jpedal 工具将PDF转换为图片。 Jpedal工具有助于将任何或大量PDF页面（比方说PDF页面= 1200）转换为.PNG图像。一般情况下这是有效的，但是在将这些大量PDF页面转换为图像时，它会导致应用程序和tomcat在没有任何信息或日志的情况下停止。

它似乎只是一个没有打印的 OutOfMemoryError 。处理时会打印行 logger.info（“width =”+ width +“height =”+ height）; 多次，但在某些时候退出并停止tomcat。任何人都可以帮助做同样的事情。我的代码： -

public boolean createPDF2ImageTask(String sourcePDFAbsPath, String destinationImageAbsPath, Float scalingFactor, String fileFormat, int softLimitInKB) throws Exception
{ 

System.setProperty("org.jpedal.flattenForm","true");
logger.info("createPDF2ImageTask ( sourcePDFAbsPath = "+sourcePDFAbsPath+" , destinationImageAbsPath = "+destinationImageAbsPath+ ", scalingFactor = "+scalingFactor+ " , fileFormat = "+fileFormat+ " softLimitInKB ="+softLimitInKB );
boolean status = true;
Float newScalingFactor;
int sizeOfImageInKB;

//PdfDecoder object provides the conversion 

PdfDecoderServer decoder = null;
Map mapValues = null;
BufferedImage imageToSave = null;
BufferedOutputStream bufferedOutputStream = null;
long startTime = System.currentTimeMillis();
try
{

    Helper.deleteFile(destinationImageAbsPath);

    //mappings for non-embedded fonts to use
    FontMappings.setFontReplacements();

    decoder = new PdfDecoderServer(true);
    decoder.openPdfFile(sourcePDFAbsPath);


    mapValues = new HashMap();


    mapValues.put(JPedalSettings.EXTRACT_AT_BEST_QUALITY_MAXSCALING, 2);

    //alternatively secify a page size (aspect ratio preserved so will do best fit)
    //set a page size (JPedal will put best fit to this)
    PdfPageData pageData = decoder.getPdfPageData();
    int width = (int)(scalingFactor*pageData.getCropBoxWidth(1));
    int height = (int)(scalingFactor*pageData.getCropBoxHeight(1));
    logger.info("width = "+ width + "   height= "+height);          
    mapValues.put(JPedalSettings.EXTRACT_AT_PAGE_SIZE, new String[]{String.valueOf(width),String.valueOf(height)});

    //which takes priority (default is false)
    mapValues.put(JPedalSettings.PAGE_SIZE_OVERRIDES_IMAGE, Boolean.TRUE);

    PdfDecoderServer.modifyJPedalParameters(mapValues);                              

    /////////////////////////////////////////////////////////////////////////////////////

    try
    {
        imageToSave = decoder.getPageAsHiRes(1, null, false);
        decoder.flushObjectValues(true);
        if(imageToSave != null)
        {
            logger.info("Start saving image as a file");
            bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(new File(destinationImageAbsPath)));

            ImageIO.write(imageToSave, fileFormat, bufferedOutputStream);

        }
        else
        {
            throw new Exception("imageToSave is null, Exception in extractPageAsImage ");
        }
    }
    catch(Exception e)
    {
        logger.error("Exception in extractPageAsImage :: "+e);
        logger.error("Exception stack trace in extractPageAsImage :: ",e);
        throw new Exception("Exception in extractPageAsImage :: "+e);
    }

Java应用程序和tomcat突然停止，没有明显的原因

0 个答案: