Question

我的要求是使用来自数据库的一些数据创建一个动态报告pdf文件，我正在使用iText。现在，我想在网页中显示这个pdf文件以及菜单，页眉，页脚等。

因此，如果用户有一些pdf查看器，则此pdf应显示在带有打印选项的用户计算机上以打印该pdf。

Answer 1

这就是我这样做的方式。您可以在iframe或常规jsp中调用此操作

public class GeneratePdf extends ActionSupport{
    private InputStream inputStream;
    public String execute(){
        HttpServletResponse response = ServletActionContext.getResponse();
        Document document = new Document();
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        try {
            PdfWriter.getInstance(document, buffer);
            document.open();
                        // do your thing
            document.close();
        } catch (DocumentException e) {
            e.printStackTrace();
        }

        byte[] bytes = null;
        bytes = buffer.toByteArray();
        response.setContentLength(bytes.length);

        if(bytes!=null){
            inputStream = new ByteArrayInputStream ( bytes );
        }
 return SUCCESS;
}

public InputStream getInputStream() {
        return inputStream;
    }
}

在你的struts.xml

中

   <action name="GeneratePdf" class="com.xxx.action.GeneratePdf">
    <result name="success" type="stream">
            <param name="contentType">application/pdf</param>
            <param name="inputName">inputStream</param>
            <param name="contentDisposition">filename="test.pdf"</param>
            <param name="bufferSize">1024</param>
    </result>
   </action>

Answer 2

我正在使用Anu建议的inputStream操作。并使用PDF.JS库。

Online demo

GitHub

Answer 3

public ByteArrayInputStream generatePDF(List<Object> items) {

    try {

        List<InputStream> listInputStream = new ArrayList<InputStream>();
        for (int i = 0; i < items.size(); i++) {
            listInputStream.add(new ByteArrayInputStream(getBytes(items.get(i)));
        }

        HttpServletResponse response = ServletActionContext.getResponse();
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        Document document = new Document();

        PdfWriter writer = PdfWriter.getInstance(document, buffer);
        document.open();
        PdfContentByte cb = writer.getDirectContent();

        for (InputStream inputStream : listInputStream) {

            PdfReader reader = new PdfReader(inputStream);

            for (int i = 1; i <= reader.getNumberOfPages(); i++) {
                document.setPageSize(reader.getPageSize(i));
                document.newPage();
                PdfImportedPage page = writer.getImportedPage(reader, i);
                cb.addTemplate(page, 0, 0);
            }
        }

        document.close();

        byte[] bytes = null;
        bytes = buffer.toByteArray();
        response.setContentLength(bytes.length);

        return new ByteArrayInputStream(bytes);

    } catch(Exception e){
        System.out.println(e);
    }

}

Struts2在jsp中显示pdf文件

3 个答案: