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GetServletContext (). getRealPath () does not work in the controller (NPE), but works in jsp

I am trying to add an image to a pdf file. The image is in "WebContent / img / image.png". First, I save the relative path to the string, and then convert this relative path to the real path.

String relativeWebPath = "/img/image.png";
String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);
Image image1 = Image.getInstance(absoluteDiskPath);

Even this one

String absoluteDiskPath = getServletContext().getRealPath("/");

does not work.

I tried several options when I determined the relative path, but could not get them to work. I always get a nullPointerException when this line String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);tries to execute. Am I doing something wrong with a relative path or something else? I don't know if this is relevant, but I am using Spring .

@RequestMapping(value = "/exportPhonebook.html", method = RequestMethod.POST)
public void exportPhonebook(Model model, HttpServletResponse response) {
    try {
        setResponseHeaderPDF(response);
        Document document = new Document();
        ByteArrayOutputStream baosPDF = new ByteArrayOutputStream();
        PdfWriter pdfWriter = null;
        pdfWriter = PdfWriter.getInstance(document, baosPDF);
        PageNumbersEventHelper events = new PageNumbersEventHelper();
        pdfWriter.setPageEvent(events);
        document.open();
        addMetaData(document);
        addTitlePage(document);
        String relativeWebPath = "/img/image.png";
        String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);
        Image image1 = Image.getInstance(absoluteDiskPath);
        document.add(image1);
        addContent(document);
        document.close();
        pdfWriter.close();
        OutputStream os = response.getOutputStream();
        baosPDF.writeTo(os);
        os.flush();
        os.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

This is how I used it in jsp:

<input type="hidden" value="<%=getServletContext().getRealPath("/") %>" name="path">

I pass this to the controller and add a relative path to this path.

path = path + "img\\image.png";
Image image = Image.getInstance(path);

. , .

+5
3

:

ServletContext servletContext = request.getSession().getServletContext();

.

ServletContext servletContext = request.getSession().getServletContext();
String relativeWebPath = "img/image.png";
String absoluteDiskPath = servletContext.getRealPath(relativeWebPath);
+9

/WEB-INF/, /img/image.png , .

. getRealPath():

null, .

, .

0

http://ananthkannan.blogspot.ru/2009/12/servletcontextgetrealpath-returns-null.html

weblogic, webapp WAR. ServletContext.getRealPath() null WAR, . , WAR, : 1. - > Domain- > Web-. " ". config.xml, .                     

  1. The second option is at the webapp level, updating weblogic.xml as shown below: true The value set in the web application takes precedence over the value set at the domain level. The default value of this property is false.
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