Develop Reference

is it possible to access mobile phone files(pdf) using java coding

This is the qr-code generator, I put on String qrCodeData to try access the storage of my phone and open up a file, but it doesnt work. Turns out the generated qr code only gives the link.
public class QRCode {
public static void main(String[] args) {
try {
String qrCodeData = "Device storage/Download/japanese/Mastering_Kanji_1500.pdf";
String filePath = "D:\\QR code project\\Generated QR codes\\qr.png";
String charset = "UTF-8"; // or "ISO-8859-1"
Map < EncodeHintType, ErrorCorrectionLevel > hintMap = new HashMap < EncodeHintType, ErrorCorrectionLevel > ();
hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
BitMatrix matrix = new MultiFormatWriter().encode(
new String(qrCodeData.getBytes(charset), charset),
BarcodeFormat.QR_CODE, 200, 200, hintMap);
MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
.lastIndexOf('.') + 1), new File(filePath));
System.out.println("QR Code image created successfully! and stored at location"+filePath);
} catch (Exception e) {
System.err.println(e);
}
}
}

We are able to view and manipulate PDF files via the PDFBox library.
Android version.
We may also use MuPDF. It has an Android version.
Interpret the received link as a file or download it to storage, then proceed to interface with PDFBox library.
Note that file downloading and access on Android should now be done via Room interface or SQLite as recommended by Google.
Hope this helps.

How to download file in telegram bot (JAVA)

I want to download a file in my telegram bot code many tutorials say that I must use the getFile method that I can't find that in 4.2 version of the telegram API
so how I can download a file to a specific destination in host pc?
thanks

Assuming you are using TelegramBot SDK from rubenlagus (https://github.com/rubenlagus/TelegramBots), as I faced same issue. Below is my solution.
GetFile getFile = new GetFile().setFileId(fileId);
String filePath = execute(getFile).getFilePath();
File file = downloadFile(filePath, outputFile);

I had the same problem.
This was my solution. Not very nice but it works.
if (update.getMessage().hasDocument()){
String doc_id = update.getMessage().getDocument().getFileId();
String doc_name = update.getMessage().getDocument().getFileName();
String doc_mine = update.getMessage().getDocument().getMimeType();
int doc_size = update.getMessage().getDocument().getFileSize();
String getID = String.valueOf(update.getMessage().getFrom().getId());
Document document = new Document();
document.setMimeType(doc_mine);
document.setFileName(doc_name);
document.setFileSize(doc_size);
document.setFileId(doc_id);
GetFile getFile = new GetFile();
getFile.setFileId(document.getFileId());
try {
org.telegram.telegrambots.meta.api.objects.File file = execute(getFile);
downloadFile(file, new File("./data/userDoc/"+getID+"_"+doc_name));
} catch (TelegramApiException e) {
e.printStackTrace();
}
}
Here I got this solution
enter link description here

How to use OpenNLP parser models in an Android app?

I go through this link for java nlp https://www.tutorialspoint.com/opennlp/index.htm
I tried below code in android:
try {
File file = copyAssets();
// InputStream inputStream = new FileInputStream(file);
ParserModel model = new ParserModel(file);
// Creating a parser
Parser parser = ParserFactory.create(model);
// Parsing the sentence
String sentence = "Tutorialspoint is the largest tutorial library.";
Parse topParses[] = ParserTool.parseLine(sentence, parser,1);
for (Parse p : topParses) {
p.show();
}
} catch (Exception e) {
}
i download file **en-parser-chunking.bin** from internet and placed in assets of android project but code stop on third line i.e ParserModel model = new ParserModel(file); without giving any exception. Need to know how can this work in android? if its not working is there any other support for nlp in android without consuming any services?

The reason the code stalls/breaks at runtime is that you need to use an InputStream instead of a File to load the binary file resource. Most likely, the File instance is null when you "load" it the way as indicated in line 2. In theory, this constructor of ParserModelshould detect this and an IOException should be thrown. Yet, sadly, the JavaDoc of OpenNLP is not precise about this kind of situation and you are not handling this exception properly in the catch block.
Moreover, the code snippet you presented should be improved, so that you know what actually went wrong.
Therefore, loading a POSModel from within an Activity should be done differently. Here is a variant that takes care for both aspects:
AssetManager assetManager = getAssets();
InputStream in = null;
try {
in = assetManager.open("en-parser-chunking.bin");
POSModel posModel;
if(in != null) {
posModel = new POSModel(in);
if(posModel!=null) {
// From here, <posModel> is initialized and you can start playing with it...
// Creating a parser
Parser parser = ParserFactory.create(model);
// Parsing the sentence
String sentence = "Tutorialspoint is the largest tutorial library.";
Parse topParses[] = ParserTool.parseLine(sentence, parser,1);
for (Parse p : topParses) {
p.show();
}
}
else {
// resource file not found - whatever you want to do in this case
Log.w("NLP", "ParserModel could not initialized.");
}
}
else {
// resource file not found - whatever you want to do in this case
Log.w("NLP", "OpenNLP binary model file could not found in assets.");
}
}
catch (Exception ex) {
Log.e("NLP", "message: " + ex.getMessage(), ex);
// proper exception handling here...
}
finally {
if(in!=null) {
in.close();
}
}
This way, you're using an InputStream approach and at the same time you take care for proper exception and resource handling. Moreover, you can now use a Debugger in case something remains unclear with the resource path references of your model files. For reference, see the official JavaDoc of AssetManager#open(String resourceName).
Note well:
Loading OpenNLP's binary resources can consume quite a lot of memory. For this reason, it might be the case that your Android App's request to allocate the needed memory for this operation can or will not be granted by the actual runtime (i.e., smartphone) environment.
Therefore, carefully monitor the amount of requested/required RAM while posModel = new POSModel(in); is invoked.
Hope it helps.

Save file from a website with java

I'm trying to build a jsoup based java app to automatically download English subtitles for films (I'm lazy, I know. It was inspired from a similar python based app). It's supposed to ask you the name of the film and then download an English subtitle for it from subscene.
I can make it reach the download link but I get an Unhandled content type error when I try to 'go' to that link. Here's my code
public static void main(String[] args) {
try {
String videoName = JOptionPane.showInputDialog("Title: ");
subscene(videoName);
}
catch (Exception e) {
System.out.println(e.getMessage());
}
}
public static void subscene(String videoName){
try {
String siteName = "http://www.subscene.com";
String[] splits = videoName.split("\\s+");
String codeName = "";
String text = "";
if(splits.length>1){
for(int i=0;i<splits.length;i++){
codeName = codeName+splits[i]+"-";
}
videoName = codeName.substring(0, videoName.length());
}
System.out.println("videoName is "+videoName);
// String url = "http://www.subscene.com/subtitles/"+videoName+"/english";
String url = "http://www.subscene.com/subtitles/title?q="+videoName+"&l=";
System.out.println("url is "+url);
Document doc = Jsoup.connect(url).get();
Element exact = doc.select("h2.exact").first();
Element yuel = exact.nextElementSibling();
Elements lis = yuel.children();
System.out.println(lis.first().children().text());
String hRef = lis.select("div.title > a").attr("href");
hRef = siteName+hRef+"/english";
System.out.println("hRef is "+hRef);
doc = Jsoup.connect(hRef).get();
Element nonHI = doc.select("td.a40").first();
Element papa = nonHI.parent();
Element link = papa.select("a").first();
text = link.text();
System.out.println("Subtitle is "+text);
hRef = link.attr("href");
hRef = siteName+hRef;
Document subDownloadPage = Jsoup.connect(hRef).get();
hRef = siteName+subDownloadPage.select("a#downloadButton").attr("href");
Jsoup.connect(hRef).get(); //<-- Here's where the problem lies
}
catch (java.io.IOException e) {
System.out.println(e.getMessage());
}
}
Can someone please help me so I don't have to manually download subs?
I just found out that using
java.awt.Desktop.getDesktop().browse(java.net.URI.create(hRef));
instead of
Jsoup.connect(hRef).get();
downloads the file after prompting me to save it. But I don't want to be prompted because this way I won't be able to read the name of the downloaded zip file (I want to unzip it after saving using java).

Assuming that your files are small, you can do it like this. Note that you can tell Jsoup to ignore the content type.
// get the file content
Connection connection = Jsoup.connect(path);
connection.timeout(5000);
Connection.Response resultImageResponse = connection.ignoreContentType(true).execute();
// save to file
FileOutputStream out = new FileOutputStream(localFile);
out.write(resultImageResponse.bodyAsBytes());
out.close();
I would recommend to verify the content before saving.
Because some servers will just return a HTML page when the file cannot be found, i.e. a broken hyperlink.
...
String body = resultImageResponse.body();
if (body == null || body.toLowerCase().contains("<body>"))
{
throw new IllegalStateException("invalid file content");
}
...

Here:
Document subDownloadPage = Jsoup.connect(hRef).get();
hRef = siteName+subDownloadPage.select("a#downloadButton").attr("href");
//specifically here
Jsoup.connect(hRef).get();
Looks like jsoup expects that the result of Jsoup.connect(hRef) should be an HTML or some text that it's able to parse, that's why the message states:
Unhandled content type. Must be text/*, application/xml, or application/xhtml+xml
I followed the execution of your code manually and the last URL you're trying to access returns a content type of application/x-zip-compressed, thus the cause of the exception.
In order to download this file, you should use a different approach. You could use the old but still useful URLConnection, URL or use a third party library like Apache HttpComponents to fire a GET request and retrieve the result as an InputStream, wrap it into a proper writer and write your file into your disk.
Here's an example about doing this using URL:
URL url = new URL(hRef);
InputStream in = url.openStream();
OutputStream out = new BufferedOutputStream(new FileOutputStream("D:\\foo.zip"));
final int BUFFER_SIZE = 1024 * 4;
byte[] buffer = new byte[BUFFER_SIZE];
BufferedInputStream bis = new BufferedInputStream(in);
int length;
while ( (length = bis.read(buffer)) > 0 ) {
out.write(buffer, 0, length);
}
out.close();
in.close();

Can't co-create object / Can't find moniker | Jacob

When creating an ActiveXComponent using JACOB I get the following error.
com.jacob.com.ComFailException: Can't co-create object
at com.jacob.com.Dispatch.createInstanceNative(Native Method)
at com.jacob.com.Dispatch.<init>(Dispatch.java:99)
at com.jacob.activeX.ActiveXComponent.<init>(ActiveXComponent.java:58)
at com.paston.jacobtest.RidderIQ.main(RidderIQ.java:30)
The COM object which I need to use from a program which doesn't register its DLLs by itself during installation.
To register the DLL I used the 64bit version of RegAsm according to this article that could help. Also, I tried to load every DLL in of the external program because I suspected that there could be "something" wrong with loading the dependencies.
Here is my current code:
public static void main(String[] args) {
String dllDir = "C:\\Program Files (x86)\\Ridder iQ Client\\Bin\\";
File folder = new File( dllDir );
for (final File fileEntry : folder.listFiles()) {
String str = fileEntry.getName();
if (str.substring(str.lastIndexOf('.') + 1).equals("dll")) {
System.out.println(fileEntry.getName());
System.load(dllDir + str);
}
}
try {
ActiveXComponent example = new ActiveXComponent("RidderIQSDK");
} catch (Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
When changing the name to the clsid I get a different exception.
com.jacob.com.ComFailException: Can't find moniker
at com.jacob.com.Dispatch.createInstanceNative(Native Method)
at com.jacob.com.Dispatch.<init>(Dispatch.java:99)
at com.jacob.activeX.ActiveXComponent.<init>(ActiveXComponent.java:58)
at com.paston.jacobtest.RidderIQ.main(RidderIQ.java:28)
I got JACOB to work with my code in another test using the system's Random object.
ActiveXComponent random = new ActiveXComponent("clsid:4E77EC8F-51D8-386C-85FE-7DC931B7A8E7");
Object obj = random.getObject();
Object result = Dispatch.call((Dispatch) obj, "Next");
System.out.println("Result: "+result);

I tried all solution and finally succeeded to crack the code related to JACOB. Create your code as per below sample code.
public static void main(String[] args) {
String libFile = System.getProperty("os.arch").equals("amd64") ? "jacob-1.17-x64.dll" :"jacob-1.17-x86.dll";
try{
/**
* Reading jacob.dll file
*/
InputStream inputStream = certificatemain.class.getResourceAsStream(libFile);
/**
* Step 1: Create temporary file under <%user.home%>\AppData\Local\Temp\jacob.dll
* Step 2: Write contents of `inputStream` to that temporary file.
*/
File temporaryDll = File.createTempFile("jacob", ".dll");
FileOutputStream outputStream = new FileOutputStream(temporaryDll);
byte[] array = new byte[8192];
for (int i = inputStream.read(array); i != -1; i = inputStream.read(array)){
outputStream.write(array, 0, i);
}
outputStream.close();
/* Temporary file will be removed after terminating-closing-ending the application-program */
System.setProperty(LibraryLoader.JACOB_DLL_PATH, temporaryDll.getAbsolutePath());
LibraryLoader.loadJacobLibrary();
ActiveXComponent comp=new ActiveXComponent("Com.Calculation");
System.out.println("The Library been loaded, and an activeX component been created");
int arg1=100;
int arg2=50;
//using the functions from the library:
int summation=Dispatch.call(comp, "sum",arg1,arg2).toInt();
System.out.println("Summation= "+ summation);
}catch(Exception e){
e.printStackTrace();
}
}
Now let me tell you how to register your DLL. I also followed same article you mentioned but not working when you are dealing with applet.
Go to x86 framework using command line.
C:\Windows\Microsoft.NET\Framework\v2.0.50727
to register do same as
regasm.exe path_to_your_dll.dll /codebase
Don't pass any other flag except /codebase. You are done with it... Still you find any problem let me know...