I am getting a resulting file but in the response I am getting gibberish symbols
here is the code I am trying
public ResponseEntity<InputStreamResource> getExcel(String filePath) throws Exception {
try {
Path excelPath = Paths.get(filePath);
byte[] excel = Files.readAllBytes(excelPath);
ByteArrayInputStream excelToByte = new ByteArrayInputStream(excel);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.add("Content-Disposition", "attachment; filename=ABCGeneratedExcel.xls");
return ResponseEntity
.ok()
.headers(headers)
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.body(new InputStreamResource(excelToByte));
}
catch (NoSuchFileException e) {
System.out.prinln("does not exist");
}
You should use HttpServletResponse instead. And let Spring framework initialize it by declaring as Controller method's parameter. Because you will write the excel file as binary stream, do not define the return type.
Then write the response stream after setting the contentType and header for excel downloading.
public void getExcel(String filePath, HttpServletResponse response) {
byte[] excel = Files.readAllBytes(excelPath);
String fileName = "anyFileName.xlsx"
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
response.getWriter().write(excel); // in fact, you need to surround this by try-catch block
}
Path filePath = pathToFolder.resolve(fileName).normalize();
Resource resource = new UrlResource(filePath.toUri());
if (resource.exists()) {
return resource;
} else {
throw new NotFoundException(String.format("File %s not found", fileName));
}
Where path to File - in your directory, and file name - name of file in your directory.
Next step is:
Resource resource = service.downloadFile(fileName);
String contentType = null;
try {
contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
} catch (IOException e) {
log.info("Could not determine file type");
}
if (contentType == null) {
contentType = MediaType.APPLICATION_OCTET_STREAM_VALUE;
}
return ResponseEntity
.ok()
.contentType(MediaType.parseMediaType(contentType))
.header(HttpHeaders.CONTENT_DISPOSITION, String.format(
"%s; filename=%s", content.name().toLowerCase(), resource.getFilename()
)
)
.body(resource);
Where first %s - attachment - for downloading, and inline - for rendering file in the browser.
Second %s - name of file (note that if you are storing your file in the file system, use file name with extension).
Related
I used this method to download and get content type
#GetMapping("/downloadFile/")
public ResponseEntity<Resource> downloadFile(#RequestParam String fileName, HttpServletRequest request) {
// Load file as Resource
Resource resource = fileStorageService.loadOneFileAsResource(fileName);
// Try to determine file's content type
String contentType = null;
try {
contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
} catch (IOException ex) {
logger.info("Could not determine file type.");
}
// Fallback to the default content type if type could not be determined
if(contentType == null) {
contentType = "application/octet-stream";
}
return ResponseEntity.ok()
.contentType(MediaType.parseMediaType(contentType))
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
.body(resource);
}
But always detect my content "application/octet-stream", what is problem and what should I do?
thanks in advance.
You can download the file, save it and then use the following:
Path path = Paths.get(resource.getURI());
String contentType = Files.probeContentType(path);
This should give you the content type. Look over here.
Requirement:
I need to create a Rest API which can allows to download a file as well as a JSON response.
I already have 2 different APIs to solve the purpose, but now I need to merge these APIs to a single one.
public ResponseEntity<InputStreamResource> downloadFile1(
#RequestParam(defaultValue = DEFAULT_FILE_NAME) String fileName) throws IOException {
MediaType mediaType = MediaTypeUtils.getMediaTypeForFileName(this.servletContext, fileName);
System.out.println("fileName: " + fileName);
System.out.println("mediaType: " + mediaType);
File file = new File(DIRECTORY + "/" + fileName);
InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
return ResponseEntity.ok()
// Content-Disposition
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + file.getName())
// Content-Type
.contentType(mediaType)
// Contet-Length
.contentLength(file.length()) //
.body(resource);
}
Above is the existing code that only return a file to download but I need a json response as well.
You need to return Multipart content. See for example
https://github.com/juazugas/spring-boot-multipart/blob/master/src/main/java/com/example/demo/server/MultiEndpoint.java
The code
#GET
#Produces("multipart/mixed")
public MultipartBody getMulti2(#QueryParam("name") String name) {
List<Attachment> attachments = new LinkedList<>();
attachments.add(new Attachment("root", "application/json", service.getEntity(name)));
attachments.add(new Attachment("image", "application/octet-stream", service.getEntityData(name)));
return new MultipartBody(attachments, true);
}
#GetMapping(value = "/draftReport", produces=MediaType.APPLICATION_JSON_UTF8_VALUE)
public void generateDraftResport(#RequestParam("schoolID") String schoolID, HttpServletResponse response) {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
response.setHeader("Content-Disposition", "attachment; filename=" + "draft_export.xlsx");
try {
InputStream is = exportHandler.draftReport(schoolID);
org.apache.commons.io.IOUtils.copy(is, response.getOutputStream());
response.flushBuffer();
System.out.println("Successfully written");
}
catch (IOException ex) {
log.info("Error writing file to output stream. " + ex);
System.out.println("Error while writing file");
}
}
The draftReport method returns an InputStream containing the XSSFWorkbook data. On invoking my Api '/draftReport', I want that file to be available to the browser to save. What am I missing, if at all? I get all the success logs, but no download popup.
There is a page where i have files list. On cliking on any of the .txt it must get downloaded and a notification should be displayed as the notification we get in download anything on GoogleChrome.
This is my Js which is called after cliking on .txt files
Here i am doing is, i am getting the filename and the filepath of the selected file. And then using ajax sending those filename and filepath to the spring servlet.
if (options.downloadable) {
$(easyTree).find('.easy-tree-toolbar').append('<div class="fileDownload"><button class="btn btn-default btn-sm btn-primary"><span class="glyphicon glyphicon-circle-arrow-down"></span></button></div>');
$(easyTree).find('.easy-tree-toolbar .fileDownload > button').attr('title', options.i18n.downloadTip).click(function() {
var selected = getSelectedItems();
var fileName = $(selected).find(' > span > a').text();
alert("fileName**" + fileName);
var hrefValue = $(selected).find(' > span > a').attr('href');
alert("hrefValue**" + hrefValue);
if (selected.length <= 0) {
$(easyTree).prepend(warningAlert);
$(easyTree).find('.alert .alert-content').html(options.i18n.downloadNull);
} else {
$.ajax({
url: "/ComplianceApplication/downloadFileFromDirectory",
type: "GET",
data: {
hrefValue: hrefValue,
fileName: fileName
},
success: function(data) {
//$(selected).remove();
//window.location.reload();
},
error: function(e) {
}
});
}
});
}
This is my springController. Here I am getting all the data properly but the problem is file is not getting downloaded and am not even getting any error so that I can come to know what mistake I am doing.
#RequestMapping(value="/downloadFileFromDirectory",method = RequestMethod.GET)
public #ResponseBody void downloadFileFromDirectory(#PathVariable("fileName") String fileName,#RequestParam(value = "hrefValue") String hrefValue,HttpServletRequest request, HttpServletResponse response,Model model){
System.out.println("hrefValue***"+hrefValue);
String filePath = hrefValue;
ServletContext context = request.getSession().getServletContext();
File downloadFile = new File(filePath);
FileInputStream inputStream = null;
OutputStream outStream = null;
try {
inputStream = new FileInputStream(downloadFile);
response.setContentLength((int) downloadFile.length());
response.setContentType(context.getMimeType(downloadFile.getName()));
// response header
String headerKey = "Content-Disposition";
String headerValue = String.format("attachment; filename=\"%s\"", downloadFile.getName());
//String headerValue = String.format("attachment; filename=\"%s\"", downloadFile.getName());
response.setHeader(headerKey, headerValue);
// Write response
outStream = response.getOutputStream();
IOUtils.copy(inputStream, outStream);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != inputStream)
inputStream.close();
if (null != outStream)
outStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Any suggestions ???
I usually use this kind of code with no problem:
public ResponseEntity<InputStreamResource> downloadFile(#PathVariable("idForm") String idForm)
{
try
{
File parent = new File(csvFilesPath);
File file = new File(parent, idForm+".csv");
HttpHeaders respHeaders = new HttpHeaders();
MediaType mediaType = new MediaType("text","csv");
respHeaders.setContentType(mediaType);
respHeaders.setContentLength(file.length());
respHeaders.setContentDispositionFormData("attachment", "file.csv");
InputStreamResource isr = new InputStreamResource(new FileInputStream(file));
return new ResponseEntity<InputStreamResource>(isr, respHeaders, HttpStatus.OK);
}
catch (Exception e)
{
String message = "Errore nel download del file "+idForm+".csv; "+e.getMessage();
logger.error(message, e);
return new ResponseEntity<InputStreamResource>(HttpStatus.INTERNAL_SERVER_ERROR);
}
}
The problem it's in you ajax code, so you can use JQuery File Download.
It's as simple as
$.fileDownload('/url/to/download.pdf');
Here you can see a tutorial
http://johnculviner.com/jquery-file-download-plugin-for-ajax-like-feature-rich-file-downloads/
I have the following architecture
[angularjs service] -> [play framework] -> [REST service; Karaf]
I would like to download a file from Karaf Application server.
Here is my code of the Karaf:
#GET
#Path("/get")
#Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response getFile() {
File file = new File(FILE_PATH);
ResponseBuilder response = Response.ok((Object) file);
response.header("Content-Disposition",
"attachment; filename=newfile.zip");
return response.build();
}
and then I developed a Play controller with the following method
public static Result direct(String file) {
String path = null;
try {
path = request().getHeader("Service-End-Point");
if (path==null) path = request().getQueryString("Service-End-Point");
if (path==null) path = file;
System.out.println(path);
URL url = new URL(path);
return ok(url.openStream());
} catch (IOException ex) {
ex.printStackTrace();
System.out.println("Path " + path + " is not working...");
return badRequest("server didn't answer");
}
}
on the conf/routes file
GET /direct controllers.Clients.direct()
on angularjs service
window.location.href='./direct?url='+ http://Karaf:9000/service/get
it is working, but is there a more elegant way?