I created a pdf file based on the thymeleaf template i'm actually using the template resolver, flying saucer, to write the file on the output stream
but since i can't access the front in order to define the content of the recap which would be generated every now and then when the client needs to, i thought it would be better to generate the pdf file on the server side. So my question is:
Is there a way to get the output stream where my data is written and convert it in order to
write on the fly so it won't be created in the local storage
Here's a part of my business logic:
os = new FileOutputStream(pdf);
ITextRenderer renderer = new ITextRenderer();
renderer.layout();
renderer.createPDF(os);
i use this in my controller and i use attachement content attribut in the response entity
other then that i'm open to any suggestions
thanks in advance
I had a similar task some time ago for a simple Java EE + JSF project and here's how I did it:
byte[] asPdf = .... (your pdf data)
String filename = "demo.pdf";
HttpServletResponse response = Faces.getResponse(); // Using Omnifaces in this example, but that is irrelevant
// Details: https://stackoverflow.com/a/9394237/7598851
response.reset();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
response.setContentLength(asPdf.length);
response.setCharacterEncoding("UTF-8");
try (OutputStream output = response.getOutputStream()) {
output.write(asPdf);
} catch (IOException e) {
// ...
}
The complete project is here, the relevant code is in this file
Related
I am using java and struts. I have a scenario where there is 'Download' link in the page. After clicking on this link the control goes to the Action class, where I have String content which I need to write to a .txt file and then download that txt file.
Eventually whenever we click on the download link, we should be able to download a txt file having content a particular string.
I used below piece of code,
FileOutputStream outputStream = new FileOutputStream(fileNameWithDirectory);
outputStream.write(fileContentString.getBytes());
outputStream.close();
ActionForward forward = new ActionForward("doc/" + filename);
forward.setName(filename);
forward.setRedirect(true);
return forward;
Also I tried with FileWriter in place of FileOutputStream like,
FileWriter fileWriter = new FileWriter(fileNameWithDirectory);
fileWriter.write(fileContentString);
fileWriter.flush();
fileWriter.close();
But always instead of downloading the txt file, the control opens a new window where the String content is written.
Please suggest me, how would I able to download that .txt file.
You should add Content-Disposition: attachment to say browser, that it should download the file, not to open it.
See more details here
Also Struts has DownloadAction, you may use it as well.
You don't need to write the file and then redirect to it. You can set a http response header called Content-Disposition and then print your data into the http response body.
use it like this
response.addHeader("Content-Disposition", "Content-Disposition: attachment; filename=\""+filename+"\"");
of course this depends on which technology stack you're using.
Convert your text file to stream. and set content type as you wanted to download.
response.setContentType("application/pdf");
try {
// get your file as InputStream
InputStream is = ...;
// copy it to response's OutputStream
org.apache.commons.io.IOUtils.copy(is, convertedTextFiletoStream);
} catch (IOException ex) {
log.info("Error writing file to output stream. Filename was '{}'", fileName, ex);
throw new RuntimeException("IOError writing file to output stream");
}
I am doing a JSP site,using hibernate
where I need to display PDF files,doc files etc . I have byte array of PDF/doc file by webservice and I need to display that byte array as PDF file/doc in HTML.i convet this into pdf by using the following code and its correctly shows in html page
byte[] pdf = new byte[] {}; // Load PDF byte[] into here
if (pdf != null) {
// set pdf content
response.setContentType("application/pdf");
// write the content to the output stream
BufferedOutputStream fos1 = new BufferedOutputStream(
response.getOutputStream());
fos1.write(ba1);
fos1.flush();
fos1.close();
}
for doc file i change the response.ContentType from
response.setContentType("application/pdf");
to
response.setContentType( "application/msword" );
but instead of displaying its is showing a down load window.how can i resolve this issue
Try this:
01 response.setContentLength(pdf.length);
Any proxy or antivirus or firewall may guess the download is completed. So inform the browser how many bytes you wish to transfer.
I've a Servlet that makes and returns a zip file
Something like this
response.setHeader("Pragma","Public");
response.setHeader("Cache-Control","must-revalidate,post-check=0,pre-check=0");
response.setContentType("application/octet-stream");
response.setHeader("Expires", "0");
response.setHeader("Content-Transfer-Encoding", "binary");
if(file.getName().contains("–")){
response.setHeader("Content-Disposition", "inline; filename=\"file.zip\"");
}
OutputStream os = response.getOutputStream();
ZipOutputStream zos = new ZipOutputStream(os);
for (File f : files) {
//add files, it's working...
}
bis.close();
fis.close();
zos.closeEntry();
}
zos.flush();
zos.close();
os.flush();
os.close();
Currently to download I'm using a iframe, so I set src attribute to start download.
The download frame loads when call this function
function loadIDownloadFrame(url) {
document.getElementById("idownloadFrame").src=url;
}
But now, I need show a message after return the zip file without leaving current page. I need to know if the servlet returned the zip file.
I tried get iframe status with "window.frames['idownloadFrame'].document.readyState", but always status is "complete".
Anyone have any solutions?
I think you could directly refer to download link to mapped Servlet(which returns the downloadable binary). It would not change the page if you set appropriate header in the mapped servlet to return the binary, from the code snippet it looks like you are doing that already. Why do you have to have file download in a different iframe? You don't necessarily need that.
Where do you have to show the message? Like a JavaScript alert or something?
I have an xml file already being created and rendered as a PDF sent over a servlet:
TraxInputHandler input = new TraxInputHandler(
new File(XML_LOCATION+xmlFile+".xml"),
new File(XSLT_LOCATION)
);
ByteArrayOutputStream out = new ByteArrayOutputStream();
//driver is just `new Driver()`
synchronized (driver) {
driver.reset();
driver.setRenderer(Driver.RENDER_PDF);
driver.setOutputStream(out);
input.run(driver);
}
//response is HttpServletResponse
byte[] content = out.toByteArray();
response.setContentType("application/pdf");
response.setContentLength(content.length);
response.getOutputStream().write(content);
response.getOutputStream().flush();
This is all working perfectly fine.
However, I now have another PDF file that I need to include in the output. This is just a totally separate .pdf file that I was given. Is there any way that I can append this file either to the response, the driver, out, or anything else to include it in the response to the client? Will that even work? Or is there something else I need to do?
We also use FOP to generate some documents, and we accept uploaded documents, all of which we eventually combine into a single PDF.
You can't just send them sequentially out the stream, because the combined result needs a proper PDF file header, metadata, etc.
We use the iText library to combine the files, starting off with
PdfReader reader = new PdfReader(/*String*/fileName);
reader.consolidateNamedDestinations();
We later loop through adding pages from each pdf to the new combined destination pdf, adjusting the bookmark / page numbers as we go.
AFAIK, FOP doesn't provide this sort of functionality.
In my project (Java SpringMVC3) I get an XLS file via HttpClient and I want that file to be downloaded like it's a real download. A popup window showing download dialog.
How can I do that?
Controller should copy the content of file to response object. Do not forget - controller function must return NULL. Below I show a working example from my application:
String filename = /* path to a file */
File file = new File(filename);
response.setContentType(new MimetypesFileTypeMap().getContentType(file));
response.setContentLength((int)file.length());
response.setHeader("content-disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
InputStream is = new FileInputStream(file);
FileCopyUtils.copy(is, response.getOutputStream());
return null;
Basically you need to implement a Controller that takes care of the download and specify the response's header-mime type. then you invoke that Controller from the view.
Here is a short example how to specify a header-mime type
HTTP Header Mime Type in Websphere Application Server 7