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JAVA output of exe file(executed with ProcessBuilder) does not redirected to console

I'm making java console application for windows which reads user's clipboard and if the content is https://youtube.com link, downloads the audio to mp3 file using youtube-dl.
I tried to use ProcessBuilder to download&convert video to audio, but I keep failing to redirect output of youtube-dl.exe to console.
package com.awidesky.YoutubeClipboardAutoDownlader;
import java.io.File;
import java.io.FilenameFilter;
import java.lang.ProcessBuilder.Redirect;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
public class YoutubeAudioDownloader {
private static final String youtubedlpath = new File("").getAbsolutePath() + "\\resources\\ffmpeg\\bin"; //Thread.currentThread().getContextClassLoader().getResource("ffmpeg/bin").getPath();
private static File downloadPath;
static {
if (!new File(youtubedlpath + "\\youtube-dl.exe").exists()) { throw new Error("youtube-dl.exe does not exist!"); }
}
static void download(String url, String path) throws Exception {
downloadPath = new File(path);
try {
//Main.log(downloadPath.getAbsolutePath());
ProcessBuilder pb = new ProcessBuilder(youtubedlpath + "\\youtube-dl", "-x", "--audio-format", "mp3", "--audio-quality", "0", url);
pb.directory(new File(youtubedlpath));
Process p = pb.start();
pb.redirectError(Redirect.INHERIT);
pb.redirectOutput(Redirect.INHERIT);
/*
* Thread stdout = new Thread(() -> {
*
* BufferedReader br = new BufferedReader(new
* InputStreamReader(p.getInputStream())); String line = null;
*
* try {
*
* while((line = br.readLine ()) != null) {
*
* Main.log(line);
*
* }
*
* } catch (IOException e) {
*
* // TODO Auto-generated catch block Main.log(e.toString());
*
* }
*
* });
*
* Thread stderr = new Thread(() -> {
*
* BufferedReader br = new BufferedReader(new
* InputStreamReader(p.getErrorStream())); String line = null;
*
* try {
*
* while((line = br.readLine ()) != null) {
*
* Main.log(line);
*
* }
*
* } catch (IOException e) {
*
* // TODO Auto-generated catch block Main.log(e.toString());
*
* }
*
* });
*
* stdout.start(); stderr.start();
*/
p.waitFor();
//Thread.currentThread().sleep(100);
Main.log("founding downloaded file...");
File[] fileList = new File(youtubedlpath).listFiles(new FilenameFilter() {
#Override
public boolean accept(File dir, String name) {
// TODO Auto-generated method stub
return name.endsWith("mp3");
}
});
if(fileList.length ==0 ) { throw new RuntimeException("Didn't dowload any files!"); }
for(File f : fileList) {
Files.copy(f.toPath(), Paths.get(downloadPath.getAbsolutePath() + "\\" + f.getName()) ,StandardCopyOption.REPLACE_EXISTING);
Files.delete(f.toPath());
}
Main.log("Done!");
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
If I get InputStreamReader from Process p and use two Threads and while to print, I can get correct output from eclipse but I can't get any when I launch with java -jar YoutubeClipBoardAutoDownlaoder.jar.
And when I use pb.redirectError(Redirect.INHERIT); and pb.redirectOutput(Redirect.INHERIT);,
neither eclipse console and Windows console I get output.
Where did I do wrong?
Whole codes of the project is here and below is the main class of it.
package com.awidesky.YoutubeClipboardAutoDownlader;
import java.awt.Toolkit;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.FlavorEvent;
import java.awt.datatransfer.FlavorListener;
import java.io.File;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
/** Main class */
public class Main {
private static ExecutorService executorService = Executors.newFixedThreadPool(1);
private static boolean isOkToStart = false; /** I don't know why but when you copied something, <code>flavorsChanged</code> invoked twice and we should ignore the first one. */
public static void main(String[] args) throws Exception {
JFileChooser jfc = new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
jfc.setDialogTitle("Choose directory for saving music!");
jfc.showDialog(new JFrame(), null);
File dir = jfc.getSelectedFile();
Toolkit.getDefaultToolkit().getSystemClipboard().addFlavorListener(new FlavorListener() {
#Override
public void flavorsChanged(FlavorEvent e) {
if (!isOkToStart) { isOkToStart = true; return; }
System.err.println("CLIPBOARD CHANGED");
executorService.submit(() -> {
try {
Thread.sleep(100);
String data = (String)Toolkit.getDefaultToolkit().getSystemClipboard().getData(DataFlavor.stringFlavor);
if (data.startsWith("https://www.youtu")) {
log("Receved a link from your clipboard : " + data);
YoutubeAudioDownloader.download(data, dir.getAbsolutePath());
}
} catch(Exception err) {
log(err.toString());
}
});
isOkToStart = !isOkToStart;
}
});
log("Listning clipboard...");
}
public static void log(String data) {
System.out.println(data);
}
}
You might ask me...
Do you HAVE TO use youtuve-dl?
-Nope. The only reason I use this is that I didn't find any better one to download audio from youtube.com.
Why do you use only one Thread pool?
-Avoid taking long time in event thread & I think processes got crashed when I execute multiple youtuve-dl.exe(not sure though)

You should redirect output before process start.
pb.redirectError(Redirect.INHERIT);
pb.redirectOutput(Redirect.INHERIT);
Process p = pb.start();

I searched several week and finally got it. Problem was not the I/O, but the packaging.
Since I put .exefile (the youtube-dlfile) inside of my jar, Java couldn't find the file.
I put resources folder outside of the .jar and it worked well.
But still I can't found out why jvm gave me no ‘’’Error’’’ or ‘’’Exception’’’about that.(maybe problem of the I/O?)

File input and output in java

I am beginner of java.
i am trying a write and show file.
But my txt file show another symbol.
I can not understand what my Error.
I am using this code.
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class Main {
/**
* #param args
* #throws IOException
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
try {
FileOutputStream output=new FileOutputStream("C:\\Users\\BAPPY\\Desktop\\temp.txt");
for (int i = 0; i <=10; i++) {
output.write(i);
}
output.close();
FileInputStream input=new FileInputStream("C:\\Users\\BAPPY\\Desktop\\temp.txt");
int value;
while ((value=input.read())!=-1) {
System.out.println(value+" ");
}
input.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
my txt file did not show result why please tell me??

I think that your code is working the problem is that you are not seeing anything cause what you are writing are not understandable symbols.
Change
for (int i = 0; i <=10; i++) {
output.write(i);
}
for
for (int i = 66; i <=127; i++) {
output.write(i);
}
and tell how it goes.
I hope it helps

how to use At4J or 7-Zip-JBinding to get an InputStream of a file?

I looked into at4j and 7-Zip-JBinding (their javadoc and documentation) but they doesn't seem to be able to read without extracting (and get an InputStream from archived file)
Is there any method I'm missing or haven't found ?
a solution other than extracting to a temporary folder to read it
I'm expecting an answer in how to do it in at4j or 7-Zip-JBinding
in other words I want to know how to utilize below mentioned function in at4j or 7-Zip-JBinding
I know java's built in one has getInputStream I'm currently using it this way
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
/**
* get input stream of current file
* #param path path inside zip
* #return InputStream
*/
public InputStream getInputStream(String path){
try {
ZipEntry entry = zipFile.getEntry(path);
if(entry!=null){
return zipFile.getInputStream(entry);
}
return new ByteArrayInputStream("Not Found".getBytes());
} catch (Exception ex) {
//handle exception
}
return null;
}
(^^ zipFile is a ZipFile object)

found the solution using 7-Zip-JBinding
just need to use ByteArrayInputStream ,this so far worked for a small file
pass a archive as argument to get all files inside printed
file ExtractItemsSimple.java
import java.io.IOException;
import java.io.RandomAccessFile;
import net.sf.sevenzipjbinding.ISevenZipInArchive;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.SevenZipException;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import net.sf.sevenzipjbinding.simple.ISimpleInArchive;
import net.sf.sevenzipjbinding.simple.ISimpleInArchiveItem;
public class ExtractItemsSimple {
public static void main(String[] args) {
RandomAccessFile randomAccessFile = null;
ISevenZipInArchive inArchive = null;
try {
randomAccessFile = new RandomAccessFile(args[0], "r");
inArchive = SevenZip.openInArchive(null, // autodetect archive type
new RandomAccessFileInStream(randomAccessFile));
ISimpleInArchive simpleInArchive = inArchive.getSimpleInterface();
for (ISimpleInArchiveItem item : simpleInArchive.getArchiveItems()) {
final int[] hash = new int[] { 0 };
if (!item.isFolder()) {
System.out.println(ArchieveInputStreamHandler.slurp(new ArchieveInputStreamHandler(item).getInputStream(),1000));
}
}
} catch (Exception e) {
System.err.println("Error occurs: " + e);
System.exit(1);
} finally {
if (inArchive != null) {
try {
inArchive.close();
} catch (SevenZipException e) {
System.err.println("Error closing archive: " + e);
}
}
if (randomAccessFile != null) {
try {
randomAccessFile.close();
} catch (IOException e) {
System.err.println("Error closing file: " + e);
}
}
}
}
}
file ArchieveInputStreamHandler.java
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import net.sf.sevenzipjbinding.ISequentialOutStream;
import net.sf.sevenzipjbinding.SevenZipException;
import net.sf.sevenzipjbinding.simple.ISimpleInArchiveItem;
public class ArchieveInputStreamHandler {
private ISimpleInArchiveItem item;
private ByteArrayInputStream arrayInputStream;
public ArchieveInputStreamHandler(ISimpleInArchiveItem item) {
this.item = item;
}
public InputStream getInputStream() throws SevenZipException{
item.extractSlow(new ISequentialOutStream() {
#Override
public int write(byte[] data) throws SevenZipException {
arrayInputStream = new ByteArrayInputStream(data);
return data.length; // Return amount of consumed data
}
});
return arrayInputStream;
}
//got from http://stackoverflow.com/questions/309424/read-convert-an-inputstream-to-a-string
public static String slurp(final InputStream is, final int bufferSize){
final char[] buffer = new char[bufferSize];
final StringBuilder out = new StringBuilder();
try {
final Reader in = new InputStreamReader(is, "UTF-8");
try {
for (;;) {
int rsz = in.read(buffer, 0, buffer.length);
if (rsz < 0)
break;
out.append(buffer, 0, rsz);
}
}
finally {
in.close();
}
}
catch (UnsupportedEncodingException ex) {
/* ... */
}
catch (IOException ex) {
/* ... */
}
return out.toString();
}
}

Are you looking for http://docs.oracle.com/javase/6/docs/api/java/util/zip/ZipInputStream.html which can extract entries in zip file without extracting it completely.

Exception reading XLSB File Apache POI java.io.CharConversionException

Im developing a Java aplication that reads an excel xlsb file using Apache POI, but I got an exception while reading it, my code is as follows:
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.Package;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
import java.util.Iterator;
public class Prueba {
public static void main (String [] args){
String direccion = "C:/Documents and Settings/RSalasL/My Documents/New Folder/masstigeoct12.xlsb";
Package pkg;
try {
pkg = Package.open(direccion);
XSSFReader r = new XSSFReader(pkg);
SharedStringsTable sst = r.getSharedStringsTable();
XMLReader parser = fetchSheetParser(sst);
Iterator<InputStream> sheets = r.getSheetsData();
while(sheets.hasNext()) {
System.out.println("Processing new sheet:\n");
InputStream sheet = sheets.next();
InputSource sheetSource = new InputSource(sheet);
parser.parse(sheetSource);
sheet.close();
System.out.println("");
}
} catch (InvalidFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (OpenXML4JException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void processAllSheets(String filename) throws Exception {
Package pkg = Package.open(filename);
XSSFReader r = new XSSFReader( pkg );
SharedStringsTable sst = r.getSharedStringsTable();
XMLReader parser = fetchSheetParser(sst);
Iterator<InputStream> sheets = r.getSheetsData();
while(sheets.hasNext()) {
System.out.println("Processing new sheet:\n");
InputStream sheet = sheets.next();
InputSource sheetSource = new InputSource(sheet);
parser.parse(sheetSource);
sheet.close();
System.out.println("");
}
}
public static XMLReader fetchSheetParser(SharedStringsTable sst) throws SAXException {
XMLReader parser =
XMLReaderFactory.createXMLReader(
"org.apache.xerces.parsers.SAXParser"
);
ContentHandler handler = new SheetHandler(sst);
parser.setContentHandler(handler);
return parser;
}
private static class SheetHandler extends DefaultHandler {
private SharedStringsTable sst;
private String lastContents;
private boolean nextIsString;
private SheetHandler(SharedStringsTable sst) {
this.sst = sst;
}
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
// c => cell
if(name.equals("c")) {
// Print the cell reference
System.out.print(attributes.getValue("r") + " - ");
// Figure out if the value is an index in the SST
String cellType = attributes.getValue("t");
if(cellType != null && cellType.equals("s")) {
nextIsString = true;
} else {
nextIsString = false;
}
}
// Clear contents cache
lastContents = "";
}
public void endElement(String uri, String localName, String name)
throws SAXException {
// Process the last contents as required.
// Do now, as characters() may be called more than once
if(nextIsString) {
int idx = Integer.parseInt(lastContents);
lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
nextIsString = false;
}
// v => contents of a cell
// Output after we've seen the string contents
if(name.equals("v")) {
System.out.println(lastContents);
}
}
public void characters(char[] ch, int start, int length)
throws SAXException {
lastContents += new String(ch, start, length);
}
}
}
And the exception is this:
java.io.CharConversionException: Characters larger than 4 bytes are not supported: byte 0x83 implies a length of more than 4 bytes
at org.apache.xmlbeans.impl.piccolo.xml.UTF8XMLDecoder.decode(UTF8XMLDecoder.java:162)
at org.apache.xmlbeans.impl.piccolo.xml.XMLStreamReader$FastStreamDecoder.read(XMLStreamReader.java:762)
at org.apache.xmlbeans.impl.piccolo.xml.XMLStreamReader.read(XMLStreamReader.java:162)
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.yy_refill(PiccoloLexer.java:3474)
at org.apache.xmlbeans.impl.piccolo.xml.PiccoloLexer.yylex(PiccoloLexer.java:3958)
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.yylex(Piccolo.java:1290)
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.yyparse(Piccolo.java:1400)
at org.apache.xmlbeans.impl.piccolo.xml.Piccolo.parse(Piccolo.java:714)
at org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3439)
at org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1270)
at org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1257)
at org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderBase.java:345)
at org.openxmlformats.schemas.spreadsheetml.x2006.main.WorkbookDocument$Factory.parse(Unknown Source)
at org.apache.poi.xssf.eventusermodel.XSSFReader$SheetIterator.<init>(XSSFReader.java:207)
at org.apache.poi.xssf.eventusermodel.XSSFReader$SheetIterator.<init>(XSSFReader.java:166)
at org.apache.poi.xssf.eventusermodel.XSSFReader.getSheetsData(XSSFReader.java:160)
at EDManager.Prueba.main(Prueba.java:36)
The file has 2 sheets, one with 329 rows and 3 columns and the other with 566 rows and 3 columns, I just want to read the file to find if a value is in the second sheet.

Apache POI doesn't support the .xlsb file format for anything other than text extraction. Apache POI will happily provide full read or write support .xls files (via HSSF) and .xlsx files (via XSSF), or both (via the common SS UserModel interface).
However, the .xlsb format is not supported for generatl operations - it's a very odd hybrid between the two, and the large amount of work involved has meant no-one has been willing to volunteer/sponsor the work required.
What Apache POI does offer for .xlsb, as of Apache POI 3.15 beta3 / 3.16, is a text extractor for .xlsb files - XSSFBEventBasedExcelExtractor. You can use that to get the text out of your file, or with a few tweaks convert it to something like CSV
For full read/write support, you'll need to convert your file to either .xls (if it doesn't have very large numbers of rows/columns), or .xlsx (if it does). If you're really really keen to help though, you could review the source code for XSSFBEventBasedExcelExtractor, then have a go at contributing patches to add full support to POI for it!
(Additionally, I think from the exception that your particular .xlsb file is partly corrupt, but even if it wasn't it still wouldn't be supported by Apache POI for anything other than text extraction, sorry)

I have tried reading XLSB file using Apache POI and it is successful. Below is the code snippet I have used.
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.xssf.binary.XSSFBSharedStringsTable;
import org.apache.poi.xssf.binary.XSSFBSheetHandler;
import org.apache.poi.xssf.binary.XSSFBStylesTable;
import org.apache.poi.xssf.eventusermodel.XSSFBReader;
import org.xml.sax.SAXException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
public class ApachePoiXLSB {
public static void main (String [] args){
String xlsbFileName = "test.xlsb";
OPCPackage pkg;
try {
pkg = OPCPackage.open(xlsbFileName);
XSSFBReader r = new XSSFBReader(pkg);
XSSFBSharedStringsTable sst = new XSSFBSharedStringsTable(pkg);
XSSFBStylesTable xssfbStylesTable = r.getXSSFBStylesTable();
XSSFBReader.SheetIterator it = (XSSFBReader.SheetIterator) r.getSheetsData();
List<String> sheetTexts = new ArrayList<>();
while (it.hasNext()) {
InputStream is = it.next();
String name = it.getSheetName();
TestSheetHandler testSheetHandler = new TestSheetHandler();
testSheetHandler.startSheet(name);
XSSFBSheetHandler sheetHandler = new XSSFBSheetHandler(is,
xssfbStylesTable,
it.getXSSFBSheetComments(),
sst, testSheetHandler,
new DataFormatter(),
false);
sheetHandler.parse();
testSheetHandler.endSheet();
sheetTexts.add(testSheetHandler.toString());
}
System.out.println("output text:"+sheetTexts);
} catch (InvalidFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (OpenXML4JException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
import org.apache.poi.xssf.eventusermodel.XSSFSheetXMLHandler;
import org.apache.poi.xssf.usermodel.XSSFComment;
class TestSheetHandler implements XSSFSheetXMLHandler.SheetContentsHandler {
private final StringBuilder sb = new StringBuilder();
public void startSheet(String sheetName) {
sb.append("<sheet name=\"").append(sheetName).append(">");
}
public void endSheet() {
sb.append("</sheet>");
}
#Override
public void startRow(int rowNum) {
sb.append("\n<tr num=\"").append(rowNum).append(">");
}
#Override
public void endRow(int rowNum) {
sb.append("\n</tr num=\"").append(rowNum).append(">");
}
#Override
public void cell(String cellReference, String formattedValue, XSSFComment comment) {
formattedValue = (formattedValue == null) ? "" : formattedValue;
if (comment == null) {
sb.append("\n\t<td ref=\"").append(cellReference).append("\">").append(formattedValue).append("</td>");
} else {
sb.append("\n\t<td ref=\"").append(cellReference).append("\">")
.append(formattedValue)
.append("<span type=\"comment\" author=\"")
.append(comment.getAuthor()).append("\">")
.append(comment.getString().toString().trim()).append("</span>")
.append("</td>");
}
}
#Override
public void headerFooter(String text, boolean isHeader, String tagName) {
if (isHeader) {
sb.append("<header tagName=\"").append(tagName).append("\">").append(text).append("</header>");
} else {
sb.append("<footer tagName=\"").append(tagName).append("\">").append(text).append("</footer>");
}
}
#Override
public String toString() {
return sb.toString();
}
}

I have a implementation using the smartxls, and my code firts convert the xlsb to xlsx and after can use ApachePoi. The next method receive a java.io.File and verify if its extension is xlsb and convert this to xlsx and replace file whit the new. This works for me.
private void processXLSBFile(File file) {
WorkBook workBook = new WorkBook();
String filePath = file.getAbsolutePath();
if (FilenameUtils.getExtension(filePath).equalsIgnoreCase((Static.XLSB_EXT))) {
try {
workBook.readXLSB(new java.io.FileInputStream(filePath));
filePath = filePath.replaceAll("(?i)".concat(Static.XLSB),
Static.XLSX_EXT.toLowerCase());
workBook.writeXLSX(new java.io.FileOutputStream(filePath));
final File xlsb = new File(filePath);
file = xlsb;
} catch (Exception e) {
logger.error(e.getMessage(), e);
MensajesJSFUtil
.mostrarMensajeNegocio(new GTMException(e, ClaveMensaje.COMANDAS_ADJUNTAR_XLSBFILE_READERROR));
}
}
}

How to read MP3 file tags

I want to have a program that reads metadata from an MP3 file. My program should also able to edit these metadata. What can I do?
I got to search out for some open source code. But they have code; but not simplified idea for my job they are going to do.
When I read further I found the metadata is stored in the MP3 file itself. But I am yet not able to make a full idea of my baby program.
Any help will be appreciated; with a program or very idea (like an algorithm). :)

The last 128 bytes of a mp3 file contains meta data about the mp3 file., You can write a program to read the last 128 bytes...
UPDATE:
ID3v1 Implementation
The Information is stored in the last 128 bytes of an MP3. The Tag
has got the following fields, and the offsets given here, are from
0-127.
Field Length Offsets
Tag 3 0-2
Songname 30 3-32
Artist 30 33-62
Album 30 63-92
Year 4 93-96
Comment 30 97-126
Genre 1 127
WARINING- This is just an ugly way of getting metadata and it might not actually be there because the world has moved to id3v2. id3v1 is actually obsolete. Id3v2 is more complex than this, so ideally you should use existing libraries to read id3v2 data from mp3s . Just putting this out there.

You can use apache tika Java API for meta-data parsing from MP3 such as title, album, genre, duraion, composer, artist and etc.. required jars are tika-parsers-1.4, tika-core-1.4.
Sample Program:
package com.parse.mp3;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.parser.mp3.Mp3Parser;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class AudioParser {
/**
* #param args
*/
public static void main(String[] args) {
String fileLocation = "G:/asas/album/song.mp3";
try {
InputStream input = new FileInputStream(new File(fileLocation));
ContentHandler handler = new DefaultHandler();
Metadata metadata = new Metadata();
Parser parser = new Mp3Parser();
ParseContext parseCtx = new ParseContext();
parser.parse(input, handler, metadata, parseCtx);
input.close();
// List all metadata
String[] metadataNames = metadata.names();
for(String name : metadataNames){
System.out.println(name + ": " + metadata.get(name));
}
// Retrieve the necessary info from metadata
// Names - title, xmpDM:artist etc. - mentioned below may differ based
System.out.println("----------------------------------------------");
System.out.println("Title: " + metadata.get("title"));
System.out.println("Artists: " + metadata.get("xmpDM:artist"));
System.out.println("Composer : "+metadata.get("xmpDM:composer"));
System.out.println("Genre : "+metadata.get("xmpDM:genre"));
System.out.println("Album : "+metadata.get("xmpDM:album"));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (TikaException e) {
e.printStackTrace();
}
}
}

For J2ME(which is what I was struggling with), here's the code that worked for me..
import java.io.InputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.file.FileConnection;
import javax.microedition.lcdui.*;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.media.control.MetaDataControl;
import javax.microedition.midlet.MIDlet;
public class MetaDataControlMIDlet extends MIDlet implements CommandListener {
private Display display = null;
private List list = new List("Message", List.IMPLICIT);
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Alert alert = new Alert("Message");
private Player player = null;
public MetaDataControlMIDlet() {
display = Display.getDisplay(this);
alert.addCommand(exitCommand);
alert.setCommandListener(this);
list.addCommand(exitCommand);
list.setCommandListener(this);
//display.setCurrent(list);
}
public void startApp() {
try {
FileConnection connection = (FileConnection) Connector.open("file:///e:/breathe.mp3");
InputStream is = null;
is = connection.openInputStream();
player = Manager.createPlayer(is, "audio/mp3");
player.prefetch();
player.realize();
} catch (Exception e) {
alert.setString(e.getMessage());
display.setCurrent(alert);
e.printStackTrace();
}
if (player != null) {
MetaDataControl mControl = (MetaDataControl) player.getControl("javax.microedition.media.control.MetaDataControl");
if (mControl == null) {
alert.setString("No Meta Information");
display.setCurrent(alert);
} else {
String[] keys = mControl.getKeys();
for (int i = 0; i < keys.length; i++) {
list.append(keys[i] + " -- " + mControl.getKeyValue(keys[i]), null);
}
display.setCurrent(list);
}
}
}
public void commandAction(Command cmd, Displayable disp) {
if (cmd == exitCommand) {
notifyDestroyed();
}
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}