我正在使用Jpedal工具将PDF转换为Image。 当PDF页面的数量非常大并且我们处理它以进行转换时,tomcat会停止并且抛出异常 -
javax.imageio.IIOException: I/O error writing PNG file.
任何人都可以为此提供帮助。
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);
}
抛出异常 - 在extractPageAsImage :: javax.imageio.IIOException中出现异常:写入PNG文件的I / O错误!
答案 0 :(得分:0)
也许你可以尝试通过增加Tomcat实例的内存来解决这个问题。在Unix平台上,这可以通过在setenv.sh
中添加一些Java选项来实现:
export JAVA_OPTS="$JAVA_OPTS -Xms128m -Xmx2048m -XX:MaxPermSize=512m"
或在文件setenv.bat
中的Windows上:
set "JAVA_OPTS=%JAVA_OPTS% -Xms128m -Xmx2048m -XX:MaxPermSize=512m"
请注意,上面示例中的数字仅仅是示例,因为它们取决于平台上可用的内存。
有关如何在平台上配置Tomcat的更多详细信息,请参阅Tomcat's RUNNING.txt。