通过iText合并1000 PDF会抛出java.lang.OutOfMemoryError：Java堆空间 [英] Merging 1000 PDF thru iText throws java.lang.OutOfMemoryError: Java heap space

问题描述

我正在尝试通过iText合并1000个PDF文件。我不确定内存泄漏发生在哪里。以下是示例代码。请注意，我将在合并到父文件后立即删除child-pdf文件。请指出以下代码中的错误，或者有没有更好的方法来完成内存概念。这个过程是通过servlet（而不是独立程序）完成的。

I am trying to merge 1000 PDF Files thru iText. I am not sure where the memory leakage is happening. Below is the sample code. Note that i am removing the child-pdf file as soon as i merge to the parent file. Please pointout bug in below code or is there any better way to do this with out memory conception. This process is done thru servlet (not standalone program)

FileInputStream local_fis = null;
BufferedInputStream local_bis = null;
File localFileObj = null;
for(int taIdx=0;taIdx<totalSize;taIdx++){
    frObj = (Form3AReportObject)reportRows.get(taIdx);
    localfilename = companyId + "_" +  frObj.empNumber + ".pdf";

    local_fis = new FileInputStream(localfilename);
    local_bis = new BufferedInputStream(local_fis); 
    pdfReader = new PdfReader(local_bis);

    cb = pdfWriter.getDirectContent(); 
    document.newPage();
    page = pdfWriter.getImportedPage(pdfReader, 1);
    cb.addTemplate(page, 0, 0);
    local_bis.close();
    local_fis.close();

    localFileObj = new File(localfilename);
    localFileObj.delete();
}
document.close();

推荐答案

您可能想要尝试以下内容（例外情况）为了清楚起见，处理，文件关闭和删除被删除）：

You might want to try something like the following (exception handling, file close and delete removed for clarity):

for(int taIdx = 0; taIdx < totalSize; taIdx++) {
    Form3AReportObject frObj = (Form3AReportObject)reportRows.get(taIdx);

    localfilename = companyId + "_" +  frObj.empNumber + ".pdf";

    FileInputStream local_fis = new FileInputStream(localfilename);

    pdfWriter.freeReader(new PdfReader(local_fis));

    pdfWriter.flush();
}

pdfWriter.close();

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