Develop Reference

Download a file from a browser in a Spring MVC application [duplicate]

This question already has answers here:
Using jQuery AJAX to download a binary file
(4 answers)
Closed 5 years ago.
I have a requirement to download a csv file from a Spring MVC application. I have the data which I need to include in the file. I need to create a file on the fly in the browser session and download it to the user system. I tried doing the solution as mentioned here: Downloading a file from spring controllers
I was unable to produce the csv and it is looking for a file on the server.
What I have done so far:
Client Side Call:
$.ajax({
type: "GET",
url:"${ctx}/emp/getAttendance?empId=" + emp +"&fileName=" + file,
success: function (data) {
$('#result_loading').hide();
}
});
Server Side:
String path = req.getServletContext().getRealPath("");
File file = new File(path + "/" + fileName);
file.createNewFile();
FileInputStream inputStream = new FileInputStream(file);
resp.setContentType("application/pdf");
resp.setHeader("content-disposition;","attachment;filename=\"download.pdf\"");
OutputStream outputStream = resp.getOutputStream();
IOUtils.copy(inputStream, outputStream);
outputStream.close();
I need the Ajax call to download the file. I don't see even an empty file downloaded.
Can someone help me with this on where I am doing wrong.

You can use the FileSystemResource class from the spring framework
the class exists in the location
org.springframework.core.io.FileSystemResource
Write your data onto a file (on the physical server) by creating a csv file using the java.io.File Class and then pass the value of the file object to the constructor
FileSystemResource(File file)
and return this to the browser, the browser will automatically open up a download window once the url is loaded.
Delete the file once the file system resource is initialized, and you would be as good as you never created the file.

open pdf file with sessionAsSigner

I have a database where the user doesn't has access to.
Still I can go to the database and "read" the documents with for example
var db:NotesDatabase = sessionAsSigner.getDatabase("","somedir/some.nsf");
In this database there's a pdf file I would like to open or download. I have the filename and the unid . If the user had acces to the database I could do it with
http(s)://[yourserver]/[application.nsf] /xsp/.ibmmodres/domino/OpenAttachment/ [application.nsf]/[UNID|/$File/[AttachmentName]?Open
How can I do it with sessionAsSigner without putting a $PublicAccess=1 field on the form ?
edit:
the pdf file is stored as attachment in a richtextfield
second edit
I'm trying to use the XSnippet from Naveen and made some changes
The error message I get is : 'OutStream' not found
The code I tried is :
response.reset();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "inline; filename=" + zipFileName);
var embeddedObj:NotesEmbeddedObject = null;
var bufferInStream:java.io.BufferedInputStream = null;
var outStream:java.io.OutputStream = response.getOutputStream();
embeddedObj = downloadDocument.getAttachment(fileName);
if (embeddedObj != null) {
bufferInStream = new java.io.BufferedInputStream(embeddedObj.getInputStream());
var bufferLength = bufferInStream.available();
var data = new byte[bufferLength];
bufferInStream.read(data, 0, bufferLength); // Read the attachment data
ON THE NEXT LINE IS THE PROBLEM
OutStream.write(data); // Write attachment into pdf
bufferInStream.close();
embeddedObj.recycle();
}
downloadDocument.recycle();
outStream.flush();
outStream.close();
facesContext.responseComplete();

Create an XAgent (= XPage without rendering) which takes datebase + documentid + filename as URL parameters and delivers the file as response OutputStream.
The URL would be
http(s)://[yourserver]/download.nsf/download.xsp?db=[application.nsf]&unid=[UNID]&attname=[AttachmentName]
for an XAgent download.xsp in a database download.nsf.
The code behind the XAgent runs as sessionAsSigner and is able to read the file even the user itself has no right to access file's database.
Use Eric's blog (+ Java code) as a starting point. Replace "application/json" with "application/pdf" and stream pdf file instead of json data.
As an alternative you can adapt this XSnippet code from Thomas Adrian. Use download() together with grabFile() to write your pdf-File to OutputStream.
Instead of extracting attachment file to path and reading it from there you can stream the attachment right from document to response's OutputStream. Here is an XSnippet from Naveen Maurya as a good example.

If you can get the PDF file as a stream, you should be able to use the OutputStream of the external context's response.
Stephan Wissel has a blog posting about writing out an ODF file so you should be able to cut that up as a starting point.
http://www.wissel.net/blog/d6plinks/SHWL-8248MT
You already have the db so, you will just need to know the UNID of the document.
var doc = db.getDocumentByUNID(unid) 'unid is a supplied param
var itm:RichTextItem = doc.getFirstItem("Body") 'assuming file is in body field
Once you have the itm, you can loop round all of the embeddedObjects and get the pdf file. At this point, I don't know if you can stream it directly or if you have to detach it, but assuming you detach it, you will then use something like this.
File file = new File("path to file");
FileInputStream fileIn = new FileInputStream(file);
Don't forget to clean up the temporarily detached file

org.apache.poi.xwpf.converter.xhtml.XHTMLConverter not generating images

I am using org.apache.poi.xwpf.converter.xhtml.XHTMLConverter class to convert docx to html. Below is my groovy code
public Map convert(String wordDocPath, String htmlPath,
Map conversionParams)
{
log.info("Converting word file "+wordDocPath)
try
{
...
String notificationWorkingFolder = "C:\tomcats\Notification\store\Notification1234"
FileInputStream fis = new FileInputStream(wordDocPath);
XWPFDocument document = new XWPFDocument(fis);
XHTMLOptions options = XHTMLOptions.create().URIResolver(new FileURIResolver(new File(notificationWorkingFolder)));
File htmlFile = new File(htmlPath);
OutputStream out = new FileOutputStream(htmlFile)
XHTMLConverter.getInstance().convert(document, out, options);
log.info("Converted to HTML file "+htmlPath)
return [success:true,htmlFileName:getFileName(htmlPath)]
}
catch(Exception e)
{
log.error("Exception :"+e.getMessage(),e)
return [success:false]
}
}
The above code is converting docx to html successfully, but if docx contains any images it puts <img src="C:\tomcats\Notification\store\Notification1234\word\media\image1.png"> but do not copy the image to that folder. As a result, when I open html tag, all images appears empty. Am I missing something in code? Is there a way to generate an image srouce link instead of absolute path, like <img src="http://localhost:8080/webapp/image1.png">

I got answer for first question from this link lychaox.com/java/poi/Word07toHtml.html. I had to add one line of code options.setExtractor(new FileImageExtractor(imageFolderFile)); to generate images.
Second question I resolved by pattern search and replacement.

Even with proper usage, it's worth noting that XHTMLConverter uses XHTMLMapper, which does not process headers, footers, or VML Images. Any images falling into those categories will be lost.
The PDFConverter is more fully featured, but also uses the GPL licensed library, iText.

getAbsolutePath() like method in UploadedFile(org.apache.myfaces.custom.fileupload.UploadedFile;)

I am currently working on an application, where users are given an option to browse and upload excel file, I am badly stuck to get the absolute path of the file being browsed. As location could be anything (Windows/Linux).
import org.apache.myfaces.custom.fileupload.UploadedFile;
-----
-----
private UploadedFile inpFile;
-----
getters and setters
public UploadedFile getInpFile() {
return inpFile;
}
#Override
public void setInpFile(final UploadedFile inpFile) {
this.inpFile = inpFile;
}
we are using jsf 2.0 for UI development and Tomahawk library for browse button.
Sample code for browse button
t:inputFileUpload id="file" value="#{sampleInterface.inpFile}"
valueChangeListener="#{sampleInterface.inpFile}" />
Sample code for upload button
<t:commandButton action="#{sampleInterface.readExcelFile}" id="upload" value="upload"></t:commandButton>
Logic here
Browse button -> user will select the file by browsing the location
Upload button -> on Clicking upload button, it will trigger a method readExcelFile in SampleInterface.
SampleInterface Implementation File
public void readExcelFile() throws IOException {
System.out.println("File name: " + inpFile.getName());
String prefix = FilenameUtils.getBaseName(inpFile.getName());
String suffix = FilenameUtils.getExtension(inpFile.getName());
...rest of the code
......
}
File name : abc.xls
prefix : abc
suffix: xls
Please help me in getting the full path ( as in c:.....) of the file being browsed, this absolute path would then be passed to excelapachepoi class where it will get parsed and contents would be displayed/stored in ArrayList.

Why do you need the absolute file path? What can you do with this information? Creating a File? Sorry no, that is absolutely not possible if the webserver runs at a physically different machine than the webbrowser. Think once again about it. Even more, a proper webbrowser doesn't send information about the absolute file path back.
You just need to create the File based on the uploaded file's content which the client has already sent.
String prefix = FilenameUtils.getBaseName(inpFile.getName());
String suffix = FilenameUtils.getExtension(inpFile.getName());
File file = File.createTempFile(prefix + "-", "." + suffix, "/path/to/uploads");
InputStream input = inpFile.getInputStream();
OutputStream output = new FileOutputStream(file);
try {
IOUtils.copy(input, output);
} finally {
IOUtils.closeQuietly(output);
IOUtils.closeQuietly(input);
}
// Now you can use File.
See also:
How to get the file path from HTML input form in Firefox 3

I remember to have some problem with this in the past too. If I am not mistaken, I think you cannot get the full file path when uploading a file. I think the browser won't tell you it for security purposes.

Java file download code design problem

I have a Java project which is used as a component in a webapp. This java code writes an xls file in a specific folder. I want to provide a download functionality for this file which should be triggered as soon as file writing is done.
The problem is - without a server environment, how can write a download functionality?

Don't write to file in a specific folder. Just write to the HTTP response body immediately. The downloading job should just be done in the webapp's code. I assume that you're using Servlets. If you set the HTTP response Content-Disposition header to attachment, then the browser will pop a Save as dialogue. If you also set the Content-Type header, then the browser will understand what to do with it (e.g. it will then be able to ask Do you want to open it in Excel or to save? and so on).
response.setHeader("Content-Type", "application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"");
// Now write xls to response.getOutputStream() instead of FileOutputStream.
If the API of that Java project is well designed, then you should have a method something like this:
public void writeXls(OutputStream output) throws IOException {
// Do your job to write xls to output. E.g. if you were using POI HSSF:
// WritableWorkbook workBook = Workbook.createWorkbook(output);
// ...
}
This way you can call it in the servlet as follows after setting the aforementioned headers:
yourClass.writeXls(response.getOutputStream());
Even more, it could easily be reused/tested in a plain vanilla Java application like follows:
yourClass.writeXls(new FileOutputStream("/path/to/foo.xls"));

This is how i do it. I show a download sql in my page.
response.setHeader("Content-Disposition", "attachment; " +
"filename=ContactPurge.sql");
response.setContentType("application/x-sql-data");
response.getWriter().write(procsql);
response.getWriter().write(sql);
response.flushBuffer();