0

再会，

我正在使用 itext 将 HTML 转换为 PDF。但是当它调用XMLWorkerHelper.getInstance().parseXHtml(writer, document, is);它变得缓慢并且当我检查 JVisualVM 时，似乎存在内存泄漏。

这是我的代码：

ByteArrayOutputStream baos = new ByteArrayOutputStream();
    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, baos);        
    document.open();
    InputStream is = new ByteArrayInputStream(content.getBytes());
    XMLWorkerHelper.getInstance().parseXHtml(writer, document, is);

    document.close();
    return baos.toByteArray();

它在Tomcat服务器上运行。

这是html代码：

<!--?xml version="1.0" encoding="UTF-8"?-->
<html>
 <head> 
    <title>Title</title>
    
   
 </head> 
    
<body>  
  
      
EXAMPLE

</body>
</html>

提前致谢。

4

1 回答 1

0

对于 Maven 项目：将以下依赖项添加到项目的 pom.xml 文件中： 

    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>3.14</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
    <dependency>
        <groupId>com.itextpdf</groupId>
        <artifactId>itextpdf</artifactId>
        <version>5.5.8</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.itextpdf.tool/xmlworker -->
    <dependency>
        <groupId>com.itextpdf.tool</groupId>
        <artifactId>xmlworker</artifactId>
        <version>5.5.8</version>
    </dependency>


    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;

    import org.apache.poi.util.IOUtils;

    import com.itextpdf.text.Document;
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.pdf.PdfWriter;
    import com.itextpdf.tool.xml.XMLWorkerHelper;

    public class HtmlToPdf {
        public static void main(String[] args) throws DocumentException, IOException {
            File htmlFile = new File(args[0]);
            String pdfFileName = "test.pdf";
            Document document = new Document();
            PdfWriter writer = null;
            InputStream is = null;
            OutputStream out = null;
            if (htmlFile.exists()) {
                try {
                    is = new FileInputStream(htmlFile);
                    out = new FileOutputStream(pdfFileName);
                    writer = PdfWriter.getInstance(document, out);
                    document.open();
                    XMLWorkerHelper.getInstance().parseXHtml(writer, document, is);             
                    System.out.println("PDF Created!");
                } finally {

                    // close the document before before input stream (is) and writer closure                
                    if(document != null && document.isOpen()) {
                        document.close();
                    }

                    // no harm in closing writer here
                    if(writer != null) {
                        writer.close();
                    }
                    IOUtils.closeQuietly(out);
                    IOUtils.closeQuietly(is);
                }
            }
        }
    }
于 2016-08-17T09:20:42.317 回答