EDIT: The data I wanna send is in an rds. I fetch that into an output stream and then try to send it over as a pdf to the user.
The file gets generated but on opening the browser shows 'Failed to load PDF document.'
I have read that setting the ContentType to "application/pdf" helps but it does not in my case. The code is given below
byte[] b = generateFileService
.getDeviceHumidityRecordByPeriod(deviceIdValue, parseUnixTimestamp(startTime), parseUnixTimestamp(endTime));
OutputStream output = response.getOutputStream();
response.setContentType("application/pdf");
response.addHeader("Content-disposition", "attachment;filename=test.pdf");
output.write(b);
output.close();
response.flushBuffer();
}
if I change the file name to test.csv and then use content type as txt/plain, it works perfectly and a csv file is written.
I used Apache PDFBox to write data into a pdf file. The page offset needs to be tracked to add pages dynamically. Then you can convert the pdf into bytes and send it to the client by specifying response.setContentType("application/pdf") and response.addHeader("Content-disposition", "attachment;filename=test.pdf")
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 have created the zip file (sample.zip) which has some files with no issues. When I open the sample.zip, it contains the file which expected.
I want to put that zip file into http response. Currently I am using the following:
response.setContentType("application/zip");
response.addHeader("Content-Disposition", "attachment; filename="+"sampleZip.zip");
response.setContentLength(2048);
response.setHeader("Set-Cookie", "fileDownload=true; path=/");
FileInputStream fileInputStream = new FileInputStream("sample.zip");
OutputStream responseOutputStream = response.getOutputStream();
int bytes;
while ((bytes = fileInputStream.read()) != -1) {
responseOutputStream.write(bytes);
}
response.flushBuffer();
Now its download the zip file in my browser default download location. But when I open that zip file it showing
Cannot open file: it does not appear to be valid archive
Kindly help me to fix this please.
This code looks good to me. But you are setting a default content length which might be the issue. Create File instanceand use the file.length() method to set the content length ans use the same file for your input stream. Also reading byte by byte is not a good idea. If possible use apache's IOUtils.copy() to copy data from your input stream to the ServletOutputStream.
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.
We are running tomcat, and we are generating pdf files on the fly. I do not have the file size before hand, so I cannot direcly link to a file on the server. So I directly send the output.
response.setContentType("application/force-download");
OutputStream o = response.getOutputStream();
And then I directly output to this OutputStream.
The only problem is that the receiver does not get the filesize, so they do not know how long the download will take. Is there a way to tell the response how large the file is?
EDIT
I do know the filesize, I just cant tell the STREAM how big the file is.
The response object should have a setContentLength method:
// Assumes response is a ServletResponse
response.setContentLength(sizeHere);
Serialize the PDF byte stream to a file or in a byte array calculate its size, set the size and write it to the output stream.
I beleive you're ansering the qustion your self:
quote:
I do not have the file size before hand, so I directly send the output.
If you don't have the size you cant send it....
Why not generate the PDF file in to temp file system , or ram-base file system or memory-map file on the fly. then you can get the file size.
response.setContentType("application/force-download");
response.setContentLength(sizeHere);
OutputStream o = response.getOutputStream();