How to send a string to ffmpeg's input in Java - java

I am quite new to java, and try as I might, I can't find any examples to help me. I am running ffmpeg as a process and parsing the stderr to get various bits of data - all of which is working fine, but I want to send a "q\n" command to ffmpeg's input from a gui menu item to gracefully quit it whilst it is running when necessary. So all I want to do is send a string programmatically to ffmpeg, the equivalent of sending q return from terminal. Thanks in advance
edit here is the relevant (simplified) section of the code
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { Thread thread = new Thread() {
public void run()
BufferedReader error_reader,input_reader;
InputStreamReader error_isr,input_isr;
String ffmpeg_command = "ffmpeg " + overwrite + " -i " + "\"" + currentfilestring + "\"" + " " + stream + " " + test + " " + findsilence + " " + videocodec + " -b:v " + videoqual + " " + audiocodec + " -ac 2 -ab " + audioqual + " " + res + " " + aspectratio + " " + framerate + " " + "\"" + destdir + destfile + "\"";
System.out.println(ffmpeg_command);
try {
OutputStream stdout;
InputStream stdin;
InputStream stderr;
String errorstr,inputstr;
//Run the ffmpeg
Process ffmpeg = Runtime.getRuntime().exec(ffmpeg_command, null, new File(userDir));
//Get stdin,stderr + stdout
stdin = ffmpeg.getInputStream();
stderr = ffmpeg.getErrorStream();
stdout = ffmpeg.getOutputStream();
stdout.write("\r\n".getBytes());
stdout.flush();
stdout.close();
error_isr = new InputStreamReader(stderr);
error_reader = new BufferedReader(error_isr);
input_reader = new BufferedReader(input_isr);
while (!error_reader.ready()) {
}
while ((errorstr = error_reader.readLine()) != null) {
if(stopconv =="yes"){
//-------------------------------------------------------------------------------------
// TRYING TO INPUT "q\n" TO FFMPEG HERE
//-------------------------------------------------------------------------------------
}
error_isr.close();
error_reader.close();
stdin.close();
stderr.close();
jProgressBar1.setValue(0);
ffmpeg.destroy();
} catch (Exception e) {
e.printStackTrace();
}
};
thread.start();
}

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This is where the data is coming from:
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String date = txtDeliveryDate.getText();
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String large = txtLarge.getText();
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How would I display the data that gets collected from this into a JTable that updates whenever new data is introduced to the text file?

how to generate QR code using velocity template

I am using velocity template with java to create email content . i need to add a QR code in my email template, How do i generate QR code using velocity template ?

Velocity generates text. A QR Code is an image. Basically, Velocity can generate an <img src=...> tag, but not the QR code itself.
You will have to use a QR code generator like QRGen to generate the QR code.

String Cus_Name = (String) cmbCus_NameAdd.getSelectedItem();
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Linux and java: File is being created but text is not written

I am writing a simple terminal program that logs some information, and puts it into a text file that someone can recall on later. Mainly just to have a log of what he person has done. I have been fine in windows, and have not really had this issue, but i fear i am looking over something simple.
Like I said before, if I navigate to the project directory, I see the file has been created, but when I open the file with the text editor, none of the data in the created string is printed.
private static void writeFile( String call,float freq,String mode,int rstSnt,int rstRx,String city, String state) throws IOException{
File fileName = new File("log.txt");
FileOutputStream fos;
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fos = new FileOutputStream(fileName);
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int i =0;
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You need to close the output, or more correctly, you need to code so it will be closed (not necessarily closing it explicitly). Java 7 introduced the try with resources syntax that neatly handles exactly this situation.
Any object that is AutoCloseable can be automatically, and safely, closed using this syntax, like this:
private static void writeFile( String call,float freq,String mode,int rstSnt,int rstRx,String city, String state) throws IOException{
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Just moving the initialization of your closable objects into the try resources block will ensure they are closed, which will flush() them as a consequence of being closed.

After calling the write() function from the BufferedWriter class, you need to call the close() function. You should also call the close() function on your FileOutputStream object.
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File fileName = new File("log.txt");
FileOutputStream fos;
try {
fos = new FileOutputStream(fileName);
BufferedWriter write = new BufferedWriter(new OutputStreamWriter(fos));
int i =0;
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Why my method don't read all of my File? ... Java?

I have to display all of records in my blocks (text files), and do a split to "cover" the Fields Separators, but only the first record of my blocks are diplayed. What am I doing wrong?
enter code here
public static void listAllStudents() throws IOException {
File path = new File(Descriptor.getBlockPath());
for (int i = 0; i < path.listFiles().length; i++) {
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String string = " ", field[] = piece.split(Descriptor.getFieldSeparator());
string = " ";
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System.out.println("Course: " + field[2]);
System.out.println("Age: " + field[3]);
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} while (buf.ready());
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System.out.println();
}
}
}

See the documentation for the BufferedReader.readLine() method:
or null if the end of the stream has been reached
Then change your code to read the file line by line:
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String field[] = piece.split(Descriptor.getFieldSeparator());
if (field.length >= 6) {
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System.out.println("Name: " + field[1]);
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System.out.println("Age: " + field[3]);
System.out.println("Phone: " + field[4]);
System.out.println("Active: " + field[5]);
}
}

Generate vCard from Contact Data by java

I would like to be able to generate a vCard given the data contained within person_contact.
Here is my code.But I am unable to generate the vcard properly.
private void m1() throws IOException {
Contact contact = buildContact();
File f = new File("contact.vcf");
FileOutputStream fop = new FileOutputStream(f);
String outputImageFilePath = "contact.vcf";
createDirectoryIfNotExists(outputImageFilePath);
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String str = "BEGIN:VCARD\n" + "VERSION:4.0\n" + "N:" + contact.getFull_name() + ";;;\n"
+ "FN:" + contact.getFull_name() + "\n" + "ORG:" + contact.getOrganization_name()
+ "\n" + "TITLE:" + contact.getTitle() + "\n" + "TEL;TYPE="
+ contact.getPhone_2_type() + ";VALUE=uri:" + contact.getPhone_2() + "\n"
+ "TEL;TYPE=" + contact.getPhone_3_type() + ",voice;VALUE=uri:tel:"
+ contact.getPhone_3() + "\n" + "EMAIL:" + contact.getEmail() + "\n" + "FAX:"
+ contact.getFax() + "\n" + "STREET1:" + contact.getStreet1() + "\n" + "STREET2:"
+ contact.getStreet2() + "\n" + "CITY:" + contact.getCity() + "\n" + "STATE:"
+ contact.getState() + "\n"
+ "END:VCARD";
fop.write(str.getBytes());
// Now read the content of the vCard after writing data into it
BufferedReader br = null;
String sCurrentLine;
br = new BufferedReader(new FileReader("contact.vcf"));
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
System.out.println(f.getAbsolutePath());
}
// close the output stream and buffer reader
fop.flush();
fop.close();
System.out.println("The data has been written");
}
else
System.out.println("This file does not exist");
}
private static Contact buildContact() {
Contact contact = new Contact();
contact.setCity("xxxxxx");
contact.setCountry("xxxxxx");
contact.setEmail("test#xxxxxx.com");
contact.setFax("123456789");
contact.setFull_name("Dummy Name");
contact.setOrganization_name("Dummy-technologies");
contact.setPhone("123456789");
contact.setPhone_type("work");
contact.setPhone_2("987456321");
contact.setPhone_2_type("home");
contact.setPhone_3("564789451236");
contact.setPhone_3_type("work2");
contact.setPostal_code("500000");
contact.setState("state");
contact.setStreet1("street1");
contact.setStreet2("stree2");
contact.setTitle("company");
contact.setWebsite_url("www.text.com");
return contact;
}
It is not generating the vcard properly.Can any one help me plz.

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