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How to return a view after download a file

My English Hope you can understand me.
Hello guys, im developing a web program using Apache Velocity, but i meet a problem, i cannot return view after output a file by OutPutStream, following is my code:
#Get("test")
public String getPdfInfoByTestId(Invocation invocation, #Param("testIds") String testIds) throws Exception {
HttpServletResponse response = invocation.getResponse();
if (testIds.length() == 0) {
invocation.addModel("status", PdfStatusEnum.NOT_FOUND.getType());
return "admin_pdf_info";
}
String[] idArray = testIds.split(",");
List<Long> idList = string2LongList(testIds);
List<ContestOneTest> contestOneTestList = contestOneTestService.getByIdList(idList);
if (contestOneTestList.size() == 0) {
invocation.addModel("status", PdfStatusEnum.NOT_FOUND.getType());
//response.sendRedirect("index");
return "admin_pdf_info";
}
List<PdfInfo> pdfInfos = new ArrayList<>(contestOneTestList.size() + 1);
//填充表格需要的数据
for (ContestOneTest contestOneTest : contestOneTestList) {
PdfInfo pdfInfo = new PdfInfo();
CtsTestUser ctsTestUser = ctsTestUserService.getUserById(contestOneTest.getActorId());
pdfInfo.setActorName(ctsTestUser.getName());
pdfInfo.setTestId(contestOneTest.getId());
pdfInfo.setPaperName(contestOneTest.getPaperName());
pdfInfo.setPaperId(contestOneTest.getPaperId());
if (contestOneTest.getStatus() == OneTestStatusEnum.FINISHED.getValue() && StringUtils.isNotBlank(contestOneTest.getPdfUrl())) {
pdfInfo.setGenStatus("已处理");
pdfInfo.setRank("无需排队");
pdfInfo.setPdfUrl(contestOneTest.getPdfUrl());
} else {
pdfInfo.setGenStatus("未处理");
Long rank = JedisAdapter.zRank(RedisKeyUtil.getNewContestPdfGenQueue(),
contestOneTest.getId() + "");
pdfInfo.setRank(String.valueOf(rank));
pdfInfo.setPdfUrl("暂无");
}
}
XSSFWorkbook workbook;
String fileName = new StringBuilder().append(contestOneTestList.size())
.append("位考试的PDF生成进度").toString();
try {
//生成表格并作为下载文件输出
workbook = ExcelUtils.buildWorkbook(pdfInfos);
invocation.addModel("status", PdfStatusEnum.HAS_GENERATED);
invocation.addModel("resultCount", contestOneTestList.size());
response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");
response.setHeader("Content-Type",
"application/vnd.ms-excel");
OutputStream out = response.getOutputStream();
workbook.write(out);
} catch (Exception e) {
e.printStackTrace();
invocation.addModel("status", PdfStatusEnum.ExcelGenFailed.getType());
}
return "admin_pdf_info";
}
Is there any way to solve my problem?
Very grateful for all answers or suggesstions！

Realm findfirst() is returning null

realm newbie here and facing a problem in my project. So what I want to achieve is that, in my app when I click a photo I am saving a realm object inside my database as well as caching the image locally to be used later. Here is the code for both:
#Override
public void onPhotoSelected(PXImage photo) {
PXComposition composition = null;
PXPhoto photoParent = null;
for (PXComposition pxComposition : mSession.getCompositions()) {
if (pxComposition.getItems() == null || pxComposition.getItems().size() < 1)
continue;
for (PXPhoto item : pxComposition.getItems()) {
if (item.getImage().getOriginalPath().equals(photo.getOriginalPath())) {
composition = pxComposition;
photoParent = item;
break;
}
}
}
if (composition == null && photo.isSelected()) {
mRealm.beginTransaction();
String uuid = mSession.addPhoto(photo).getUuid();
mRealm.commitTransaction(); // IMPORTANT to commit transaction. ContentDownloadTask requires PXImage to be written in Realm.
ThreadUtils.getDefaultExecutorService().submit(new ContentDownloadTask(this, photo.getOriginalPath(), uuid));
} else if (composition != null && !photo.isSelected()) {
mRealm.beginTransaction();
if (photoParent.getImage().isDownloaded()) // FIXME What if not copied yet ???
FileUtils.deleteFile(photoParent.getImage().getApplicationPath());
mSession.removePhoto(photoParent);
mRealm.commitTransaction();
}
onCheckChanged(photo);
App.log().v("SESSION", mSession.toString());
}
This is where click events on the photo are handled. After the selection click I am calling ThreadUtils.getDefaultExecutorService().submit(new ContentDownloadTask(this, photo.getOriginalPath(), uuid)); to cache the image locally. Here is the code for the ContentDownloadTask:
public class ContentDownloadTask implements Callable<Void> {
private String id;
private String path;
private Context context;
private Realm mRealm;
public static final String TAG = "ContentDownloadTask";
private static final String DIR_EXTERNAL_NAME = "Local";
private static final String FILE_EXTENSION = ".jpg";
public ContentDownloadTask(Context context, String path, String id) {
this.path = path;
this.id = id;
this.context = context;
}
#Override
public Void call() throws Exception {
try {
Log.d(TAG, "Copying From " + path);
//create output directory if it doesn't exist
final File file = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
if (file == null) {
throw new IllegalStateException("Failed to get external storage files directory");
} else if (file.exists()) {
if (!file.isDirectory()) {
throw new IllegalStateException(file.getAbsolutePath() +
" already exists and is not a directory");
}
} else {
if (!file.mkdirs()) {
throw new IllegalStateException("Unable to create directory: " +
file.getAbsolutePath());
}
}
File to = new File(file, DIR_EXTERNAL_NAME);
if (to.exists()) {
if (!to.isDirectory()) {
throw new IllegalStateException(file.getAbsolutePath() +
" already exists and is not a directory");
}
} else if (!to.mkdirs()) {
throw new IllegalStateException("Unable to create directory: " +
file.getAbsolutePath());
}
to = new File(to, fileName(this.id));
if (!to.exists())
to.createNewFile();
InputStream in = null;
if (PackageUtils.isContentUri(path)) {
Uri uri = PackageUtils.toUri(path);
in = context.getContentResolver().openInputStream(uri);
} else {
File from = new File(this.path);
in = new FileInputStream(from);
}
OutputStream out = new FileOutputStream(to);
// Transfer bytes from in to out
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
mRealm = Realm.getDefaultInstance();
PXImage image = mRealm.where(PXImage.class).equalTo("uuid", this.id).findFirst();
if (image == null) {
to.delete();
throw new Exception("Photo Not Found ID: " + this.id);
}
mRealm.beginTransaction();
image.setApplicationPath(to.getPath());
mRealm.commitTransaction();
mRealm.close();
Log.d(TAG, "Complete Copied From " + path + " To " + to.getAbsolutePath());
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
return null;
}
Now the null is returned at this statement: PXImage image = mRealm.where(PXImage.class).equalTo("uuid", this.id).findFirst();. Basically here I need to save the application path of the image that I cached locally inside the realm object. But it's returning null. Also this not happening every time I click the photos. This only happens sometimes and the error is not reproducible. Any kind of help will be appreciated. I have already checked the following duplicate questions:
first
second
third
fourth
public PXPhoto addPhoto(PXImage image) {
PXComposition composition = null;
PXPhoto photo = null;
boolean isLandscape = false;
int photosPerItem = getProduct().getSelectedPhotosPerItem();
switch (getProduct().getRootShortCode()) {
case Product.CategoryType.SQUARES:
case Product.CategoryType.CLASSIC:
case Product.CategoryType.WALLOGRAPHS:
case Product.CategoryType.SIGNATURES:
case Product.CategoryType.MOSAIC:
setLayoutType(image.isLandscape() ? C.LayoutType.LANDSCAPE.ordinal() : C.LayoutType.PORTRAIT.ordinal());
composition = PXComposition.initializeNewComposition(this);
photo = PXPhoto.initializePhoto(image);
break;
case Product.CategoryType.PANORAMA:
composition = PXComposition.initializeNewComposition(this);
photo = PXPhoto.initializePhoto(image);
break;
case Product.CategoryType.STRIPS:
case Product.CategoryType.POSTERS:
if (getCompositions() == null || getCompositions().size() == 0
|| (getProduct().getRootShortCode().equals(Product.CategoryType.STRIPS) &&
getCompositions().last().getItems().size() % photosPerItem == 0))
composition = PXComposition.initializeNewComposition(this);
else
composition = getCompositions().last();
photo = PXPhoto.initializePhoto(image);
break;
}
composition.addItem(photo);
composition.updateComposition();
if (!composition.isManaged()) {
Realm realm = Realm.getDefaultInstance();
composition = realm.copyToRealmOrUpdate(composition);
realm.close();
photo.setComposition(composition);
addComposition(composition);
} else
photo.setComposition(composition);
return photo;
}
EDIT:
uuid generation:
public PXPhoto() {
this.uuid = UUID.randomUUID().toString();
this.autoEnhance = false;
this.zoom = 1;
}

encode special character java

I'm trying to fix a bug in the code I wrote which convert a srt file to dxfp.xml. it works fine but when there is a special character such as an ampersand it throws an java.lang.NumberFormatException error. I tried to use the StringEscapeUtils function from apache commons to solve it. Can someone explain to me what it is I am missing here? thanks in advance!
public class SRT_TO_DFXP_Converter {
File input_file;
File output_file;
ArrayList<CaptionLine> node_list;
public SRT_TO_DFXP_Converter(File input_file, File output_file) {
this.input_file = input_file;
this.output_file = output_file;
this.node_list = new ArrayList<CaptionLine>();
}
class CaptionLine {
int line_num;
String begin_time;
String end_time;
ArrayList<String> content;
public CaptionLine(int line_num, String begin_time, String end_time,
ArrayList<String> content) {
this.line_num = line_num;
this.end_time = end_time;
this.begin_time = begin_time;
this.content = content;
}
public String toString() {
return (line_num + ": " + begin_time + " --> " + end_time + "\n" + content);
}
}
private void readSRT() {
BufferedReader bis = null;
FileReader fis = null;
String line = null;
CaptionLine node;
Integer line_num;
String[] time_split;
String begin_time;
String end_time;
try {
fis = new FileReader(input_file);
bis = new BufferedReader(fis);
do {
line = bis.readLine();
line_num = Integer.valueOf(line);
line = bis.readLine();
time_split = line.split(" --> ");
begin_time = time_split[0];
begin_time = begin_time.replace(',', '.');
end_time = time_split[1];
end_time.replace(',', '.');
ArrayList<String> content = new ArrayList<String>();
while (((line = bis.readLine()) != null)
&& (!(line.trim().equals("")))) {
content.add(StringEscapeUtils.escapeJava(line));
//if (StringUtils.isEmpty(line)) break;
}
node = new CaptionLine(line_num, begin_time, end_time, content);
node_list.add(node);
} while (line != null);
} catch (Exception e) {
System.out.println(e);
}
finally {
if (bis != null) {
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
private String convertToXML() {
StringBuffer dfxp = new StringBuffer();
dfxp.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<tt xml:lang=\"en\" xmlns=\"http://www.w3.org/2006/04/ttaf1\" xmlns:tts=\"http://www.w3.org/2006/04/ttaf1#styling\">\n\t<head>\n\t\t<styling>\n\t\t\t<style id=\"1\" tts:backgroundColor=\"black\" tts:fontFamily=\"Arial\" tts:fontSize=\"14\" tts:color=\"white\" tts:textAlign=\"center\" tts:fontStyle=\"Plain\" />\n\t\t</styling>\n\t</head>\n\t<body>\n\t<div xml:lang=\"en\" style=\"default\">\n\t\t<div xml:lang=\"en\">\n");
for (int i = 0; i < node_list.size(); i++) {
dfxp.append("\t\t\t<p begin=\"" + node_list.get(i).begin_time + "\" ")
.append("end=\"" + node_list.get(i).end_time
+ "\" style=\"1\">");
for (int k = 0; k < node_list.get(i).content.size(); k++) {
dfxp.append("" + node_list.get(i).content.get(k));
}
dfxp.append("</p>\n");
}
dfxp.append("\t\t</div>\n\t</body>\n</tt>\n");
return dfxp.toString();
}
private void writeXML(String dfxp) {
BufferedWriter out = null;
try {
out = new BufferedWriter(new FileWriter(output_file));
out.write(dfxp);
out.close();
} catch (IOException e) {
System.out.println("Error Writing To File:"+ input_file +'\n');
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
if ((args.length < 2) || (args[1].equals("-h"))) {
System.out.println("\n<--- SRT to DFXP Converter Usage --->");
System.out
.println("Conversion: java -jar SRT_TO_DFXP.jar <input_file> <output_file> [-d]");
System.out
.println("Conversion REQUIRES a input file and output file");
System.out.println("[-d] Will Display XML Generated In Console");
System.out.println("Help: java -jar SRT_TO_DFXP.jar -h");
} else if (!(new File(args[0]).exists())) {
System.out.println("Error: Input SubScript File Does Not Exist\n");
} else {
SRT_TO_DFXP_Converter converter = new SRT_TO_DFXP_Converter(
new File(args[0]), new File(args[1]));
converter.readSRT();
String dfxp = converter.convertToXML();
if ((args.length == 3) && (args[2].equals("-d")))
System.out.println("\n" + dfxp + "\n");
converter.writeXML(dfxp);
System.out.println("Conversion Complete");
}
}
here's part of the srt file that it is throwing an error when exported and run as a jar file.
1
00:20:43,133 --> 00:20:50,599
literature and paper by Liversmith & Newman, and I think the point is well made that a host of factors

Send a pdf on an default Email Client - Android Aplication [duplicate]

This question already has an answer here:
Android send mail with PDF file
(1 answer)
Closed 7 years ago.
I need send a PDF file attach on a message, I have a button that calls a function that open a Intent with message, email address and subject filled, but I need that the PDF file has been attached too.
This is my code and I can not find my error, someone can help me please?
public void initializeWebView() {
// Initialize the webview
webView.setResourceClient(new XWalkResourceClient(webView) {
#Override
public boolean shouldOverrideUrlLoading(XWalkView view, String stringUrl) {
if(stringUrl.equals(baseUrl)) {
return false;
}
// mailto links will be handled by the OS.
if (stringUrl.startsWith("mailto:")) {
Uri uri = Uri.parse(stringUrl);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
String fileName = "bouhnik.pdf";
String filePath = (Configuration.getMagazineAssetPath()).toString()+ File.separator + fileName;
Context c = getActivity().getApplicationContext();
File file = null;
FileOutputStream fos = null;
try {
InputStream is = c.getAssets().open(filePath);
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
fos = new FileOutputStream(file);
fos.write(buffer);
fos.close();
} catch (IOException e) {
Log.i("Ferrou",e.toString());
e.printStackTrace();
}
if (!file.exists() || !file.canRead()) {
return false;
}
intent.putExtra(intent.EXTRA_STREAM, file.getPath());
intent.setClassName("com.android.email", "com.android.mail.compose.ComposeActivity");
intent .putExtra(Intent.EXTRA_SUBJECT, "Subject");
WebViewFragment.this.startActivity(Intent.createChooser(intent, "Send email..."));
} else {
try {
URL url = new URL(stringUrl);
// We try to remove the referrer string to avoid passing it to the server in case the URL is an external link.
String referrer = "";
if (url.getQuery() != null) {
Map<String, String> variables = Configuration.splitUrlQueryString(url);
String finalQueryString = "";
for (Map.Entry<String, String> entry : variables.entrySet()) {
if (entry.getKey().equals("referrer")) {
referrer = entry.getValue();
} else {
finalQueryString += entry.getKey() + "=" + entry.getValue() + "&";
}
}
if (!finalQueryString.isEmpty()) {
finalQueryString = "?" + finalQueryString.substring(0, finalQueryString.length() - 1);
}
stringUrl = stringUrl.replace("?" + url.getQuery(), finalQueryString);
}
// Remove referrer from query string
if (!url.getProtocol().equals("file")) {
if (referrer.equals(WebViewFragment.this.getActivity().getString(R.string.url_external_referrer))) {
Uri uri = Uri.parse(stringUrl);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
WebViewFragment.this.startActivity(intent);
} else if (referrer.toLowerCase().equals(WebViewFragment.this.getActivity().getString(R.string.url_baker_referrer))) {
((IssueActivity) WebViewFragment.this.getActivity()).openLinkInModal(stringUrl);
return true;
} else {
return false;
}
} else {
stringUrl = url.getPath().substring(url.getPath().lastIndexOf("/") + 1);
int index = ((IssueActivity) WebViewFragment.this.getActivity()).getJsonBook().getContents().indexOf(stringUrl);
if (index != -1) {
Log.d(this.getClass().toString(), "Index to load: " + index + ", page: " + stringUrl);
((IssueActivity) WebViewFragment.this.getActivity()).getViewPager().setCurrentItem(index);
view.setVisibility(View.GONE);
} else {
// If the file DOES NOT exist, we won't load it.
File htmlFile = new File(url.getPath());
if (htmlFile.exists()) {
return false;
}
}
}
} catch (MalformedURLException | UnsupportedEncodingException ex) {
Log.d(">>>URL_DATA", ex.getMessage());
}
}
return true;
}
});
// Set UI Client (Start stop animations)
webView.setUIClient(new XWalkUIClient(webView) {
#Override
public void onPageLoadStopped(XWalkView view, String url, LoadStatus status) {
if(!url.isEmpty() && status == LoadStatus.FINISHED) {
if(isUserVisible) {
webView.resumeTimers();
}else{
webView.pauseTimers();
}
}
}
});
webView.load(baseUrl, null);
}

Thank's so much for everyone!!
I solve my problem change the type of Intent to:
Intent emailIntent = new Intent(Intent.ACTION_SEND);
Because this is better to email commands, and I define a emailUri where:
emailUri = Uri.fromFile(file.getAbsoluteFile());
because this get a absolute path with a file inside, and when the email client open, it open this file, not a path.
I add a type at my intent but I select the type of my attachment, so I define:
emailIntent.setType("application/pdf");
And finally:
emailIntent.putExtra(Intent.EXTRA_STREAM, uriMail);
startActivity(emailIntent);
It's works now!! Thanks :D

It looks like something is might be going wrong with your file path. Double check it. Then
1 - You need to add the package name of your application with context.getPackageName()
private String path = Environment.getExternalStorageDirectory().getPath() + context.getPackageName() + "books/"+fileName;
2 - Declare the permission inside your AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

the value of Title property is not getting updated for jpg file using apache sanselan?

i want to update the metadata (like tag,comments etc.....) of .jpg & .tif files using JAVA
can any one help me ....
note :i have tried with the below code but when i chek the property of file using windows explorer the value of title is not updated
public static void changeExifMetadata(File jpegImageFile, File dst)
throws IOException, ImageReadException, ImageWriteException {
OutputStream os = null;
try
{
TiffOutputSet outputSet = null;
IImageMetadata metadata = Sanselan.getMetadata(jpegImageFile);
JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
if (null != jpegMetadata)
{
TiffImageMetadata exif = jpegMetadata.getExif();
if (null != exif)
{
outputSet = exif.getOutputSet();
}else {}
}
if (null == outputSet)
outputSet = new TiffOutputSet();
{
final TiffOutputDirectory exifDir = outputSet .getOrCreateExifDirectory();
byte[] rawBytes = "KasperAuthor".getBytes("UTF-16LE");
byte[] nullTerminatedBytes = new byte[rawBytes.length + 2];
exifDir.removeField(ExifTagConstants.EXIF_TAG_XPTITLE);
TiffOutputField authorField = new TiffOutputField(ExifTagConstants.EXIF_TAG_XPTITLE, ExifTagConstants.EXIF_TAG_XPTITLE.dataTypes[0], nullTerminatedBytes.length, nullTerminatedBytes);
exifDir.add(authorField);
}
} finally
{
if (os != null)
try
{
os.close();
} catch (IOException e)
{
}
}
}
thanks in advance ....