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Accessing a file in a runnable JAR [duplicate]

This question already has answers here:
Java resource as File
(6 answers)
Closed 9 years ago.
What I am attempting to do is store a text file (that won't change) inside the JAR of the program so that it can be read. The purpose of the text file is that it will be read in by one of my classes and the contents of the text file will be added to an JEditorPane. The file will basically be a tutorial and when the user clicks on the option to read the tutorial, the file contents will be read and displayed in a new window that pops up.
I have the GUI portion of it down, but as far as storing the file in the JAR so it can be accessed, I am at a lost. I've read that using an InputStream will work, but after trying a few things I haven't gotten it to work yet.
I also store images in the JAR to be used as icons for the GUI windows. This is accomplished with:
private Image icon = new ImageIcon(getClass()
.getResource("resources/cricket.jpg")).getImage();
But, this doesn't work when trying to get a file:
private File file = new File(getClass.getResource("resources/howto.txt"));
Here is my Class as it is now:
public class HowToScreen extends JFrame{
/**
*
*/
private static final long serialVersionUID = -3760362453964229085L;
private JEditorPane howtoScreen = new JEditorPane("text/html", "");
private Image icon = new ImageIcon(getClass().getResource("resources/cricket.jpg")).getImage();
private BufferedReader txtReader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/resources/howto.txt")));
public HowToScreen(){
setSize(400,300);
setLocation(500,200);
setTitle("Daily Text Tutorial");
setIconImage(icon);
howtoScreen.setEditable(false);
howtoScreen.setText(importFileStream());
add(howtoScreen);
setVisible(true);
}
public String importFile(){
String text = "";
File file = new File("howto.txt");
Scanner in = null;
try {
in = new Scanner(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while(in.hasNext()){
text += in.nextLine();
}
in.close();
return text;
}
public String importFileStream(){
String text = "";
Scanner in = new Scanner(txtReader);
while(in.hasNext()){
text += in.nextLine();
}
in.close();
return text;
}
}
Ignore the importFile method as that is being removed in favor of storing the tutorial file inside the JAR, making the program wholly self contained as I am limited to how much space the program can use.
EDIT:
After trying all of the suggestions below, I checked to see if my JAR is packaging the text file in it and it is not. When opening the JAR with 7zip, in my resources folder the picture I use for icons is there, but not the text file.

You cannot use File inside a JAR file. You need to use InputStream to read the text data.
BufferedReader txtReader = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("/resources/mytextfile.txt")));
// ... Use the buffered reader to read the text file.

Try the next (with the full path package):
InputStream inputStream = ClassLoader.getSystemClassLoader().
getSystemResourceAsStream("com/company/resources/howto.txt");
InputStreamReader streamReader = new InputStreamReader(inputStream, "UTF-8");
BufferedReader in = new BufferedReader(streamReader);
for (String line; (line = in.readLine()) != null;) {
// do something with the line
}

You code will not compile. Class.getResource() returns a URL, and File has no constructor with a URL as an argument.
You can just use .getResourceAsStream() instead, it returns an InputStream directly, you just have to read the contents of the file from that stream.
Note: both of these methods return null if the resource is not found: don't forget to check for that...

the contents of the text file will be added to an JEditorPane.
See DocumentVewer & especially JEditorPane.setPage(URL).
Since the help is an embedded-resource it will be necessary to gain an URL using getResource(String) as detailed in the info. page.
.. tried this: URL url = this.getClass().getResource("resources/howto.txt");
Change:
URL url = this.getClass().getResource("resources/howto.txt");
To:
URL url = this.getClass().getResource("/resources/howto.txt"); // note leading '/'

Japanese character not showing properly converting CSV file

I am converting CSV file from Tatoeba project. It contains Japanese characters. I am inserting data into SQLite database. Insertion is going without a problem, but characters are showing not properly.
If I insert directly:
String str = content_parts[2];
sentence.setValue(str);
Getting values like this:
ãã¿ã«ã¡ãã£ã¨ãããã®ããã£ã¦ãããã
I have tried to decode to UTF8 from JIS:
String str = content_parts[2];
byte[] utf8EncodedBytes = str.getBytes("JIS");
String s = new String(utf8EncodedBytes, "UTF-8");
sentence.setValue(s);
JIS:
$B!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!r!)!)!/!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)!r!)!)!)!)!)!)!)!)!)!)!)!)!)!)!)(B
Shift-JIS:
????\??????�N?�}??????????????????��?????�N?�N???��??????
Shift_JIS:
????\????????????????????????��?�N??????????????????��??????
CSV file (when opened by Excel 2010)
n きみにちょっとしたものをもってきたよ。
What I am doing wrong? How to solve this problem?

If you are still searching for solution, refer below link
setting-a-utf-8-in-java-and-csv-file and handle Japanese characters
csv-reports-not-displaying-japanese-characters
In brief, add BOM(byte order mark) characters to your file outputstream before passing it to outputstream writer.
String content="some string to write in file(in any language)";
FileOutputStream fos = new FileOutputStream("D:\csvFile.csv");
fos.write(239);
fos.write(187);
fos.write(191);
Writer w = new BufferedWriter(new OutputStreamWriter(fos, StandardCharsets.UTF_8));
w.write(content);
w.close();
Hope this will help

Load Html file with UTF8 encoding from assets into a TextView

I have HTML file in assets folder which is encoded in UTF8(contain Persian characters), I want to read this file and load it into a TextView.I read lots of posts like load utf-8 text file , load HTML file into TextView , read UTF8 text file from res/raw and write this code:
try{
InputStream inputStream = getResources().getAssets().open("htmls/salamati.html");
// I also try "UTF-8" but none of them worked
BufferedReader r = new BufferedReader(new InputStreamReader(inputStream,"UTF8"));
StringBuilder total = new StringBuilder();
String html;
while ((html = r.readLine()) != null) {
total.append(html);
}
// total contains incorrect characters
textView.setText(Html.fromHtml(total.toString()));
}
catch (IOException exception)
{
textView.setText("Failed loading HTML.");
}
But It show incorrect characters!
I also try to convert total.toString() into a UTF8 String array and then add it to textView but it didn't work too
textView.setText(Html.fromHtml(new String(total.toString().getBytes("ISO-8859-1"), "UTF-8")));
There is no problem with textView or emulator because when I load HTML from Database, It shows utf8 characters correctly!
So what should I do?

After lots of searching and test some other codes,at the end I replace my HTML file with another one.Surprisingly my code works fine! I investigate former HTML file and notice that it has Unicode encoding!!!
So if you have a same problem, first of all check your file's encoding and make sure that it is correct.

byte[] InputStream converted to String

This is my case: I'm using a library for reading files from a respository (I can't modify that library), the library has a method getContent that returns a String (it uses BasicResponseHandler to convert the response to String), but the repository also contains binary files too, and I need bytes[] to save that as a file. I tried using
content.getBytes("UTF-8") and it works with text files, but with other files like images, I get a corrupted file.
BasicResponseHandler uses this to convert the input to String (charset is UTF-8):
Reader reader = new InputStreamReader(instream, charset);
CharArrayBuffer buffer = new CharArrayBuffer(i);
try {
char[] tmp = new char[1024];
int l;
while((l = reader.read(tmp)) != -1) {
buffer.append(tmp, 0, l);
}
} finally {
reader.close();
}
return buffer.toString();
Does anyone know what I can do?

When you read an image, that isn't a String, and shouldn't be converted. Simply write the byte[]'s back out to file, and you'll have an image stored in said file.

If you aren't able to edit the library code being used, I would suggest looking for a new library to use. Perhaps one that doesn't assume anything about the file content type.

Java csv file unable to write string like 012365479

Hi write a java code to write the output into a csv file. This is the sample code:
File downloadPlace = new File(realContextPathFile, "general");
File gtwayDestRateFile = new File(downloadPlace, (new StringBuilder("ConnectionReport")).append(System.currentTimeMillis()).append(".csv").toString());
PrintWriter pw = new PrintWriter(new FileWriter(gtwayDestRateFile));
pw.print("Operator name,");
pw.print("Telephone Number,");
pw.print("Op1");
pw.print("012365479");
pw.print("Op2");
pw.print("09746");
pw.close();
p_response.setContentType("application/octet-stream");
p_response.setHeader("Content-Disposition", (new StringBuilder("attachment; filename=\"")).append(gtwayDestRateFile.getName()).append("\"").toString());
FileInputStream fis = new FileInputStream(gtwayDestRateFile);
byte buf[] = new byte[4096];
ServletOutputStream out = p_response.getOutputStream();
do
{
int n = fis.read(buf);
if(n == -1)
break;
out.write(buf, 0, n);
} while(true);
fis.close();
out.flush();
In both case the output is like this: 12365479 instead of 012365479
And 9746 instead of 09746
Can anyone tell me how can i solve this problem?

Are you sure that the file is written wrongly, and you're not just opening it in Excel which is interpreting these as numbers and thus losing the leading zeroes? Try opening it in a text editor.

If you write to System.out instead you get
Operator name,Telephone Number,Op1012365479Op209746
As you can see the 0 is where you would expect. Perhaps the problem is you don't have , between fields.
If you open such a file using excel it will remove leading 0 as it assume its a number. To avoid this you need to use double quotes around the field so it is treated as text.

Read the file in a text editor, my guess is that it has the zero and what's reading it is thinking it's a number. Try putting quotes round it.
pw.print("\"012365479\"");