I need to download PDF file from web, for example http://www.math.uni-goettingen.de/zirkel/loesungen/blatt15/loes15.pdf this link. I have to do it using Streams. With images it works fine by me :
public static void main(String[] args) {
try {
//get the url page from the arguments array
String arg = args[0];
URL url = new URL("https://cs7065.vk.me/c637923/v637923205/25608/AD8WhOSx1ic.jpg");
try{
//jpg
InputStream in = new BufferedInputStream(url.openStream());
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[131072];
int n = 0;
while (-1!=(n=in.read(buf)))
{
out.write(buf, 0, n);
}
out.close();
in.close();
byte[] response = out.toByteArray();
FileOutputStream fos = new FileOutputStream("borrowed_image.jpg");
fos.write(response);
fos.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
But with PDf it does not work. What could be the problem ?
I made minor edits to your code to fix syntax errors and, this seems to work (below). Consider placing your close() statements in a finally block.
package org.snb;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
public class PdfTester {
public static void main(String[] args) {
//get the url page from the arguments array
try{
//String arg = args[0];
URL url = new URL("http://www.pdf995.com/samples/pdf.pdf");
//jpg
InputStream in = new BufferedInputStream(url.openStream());
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[131072];
int n = 0;
while (-1!=(n=in.read(buf)))
{
out.write(buf, 0, n);
}
out.close();
in.close();
byte[] response = out.toByteArray();
FileOutputStream fos = new FileOutputStream("/tmp/bart.pdf");
fos.write(response);
fos.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
try this, this got the job done (and pdf is readable).
see if there are any exceptions thrown when requesting the url.
public static void main(String[] args) {
try {
//get the url page from the arguments array
URL url = new URL("http://www.math.uni-goettingen.de/zirkel/loesungen/blatt15/loes15.pdf");
try {
InputStream in = new BufferedInputStream(url.openStream());
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[131072];
int n = 0;
while (-1 != (n = in.read(buf))) {
out.write(buf, 0, n);
}
out.close();
in.close();
byte[] response = out.toByteArray();
FileOutputStream fos = new FileOutputStream("loes15.pdf");
fos.write(response);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
Related
With this code iI always get a empty file.
What I have to do with it?
login is always true. (ofc, here is not real password)
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import java.io.*;
public class Logs {
public static void main(String[] args) {
FTPClient client = new FTPClient();
try {
client.connect("myac.cs-server.pro", 121);
boolean login = client.login("a3ro", "passWordIsSecret");
System.out.println(login);
String remoteFile1 = "myac_20150304.log";
File downloadFile1 = new File("C:\\Users\\Aero\\Desktop\\test\\myac.log");
OutputStream outputStream1 =
new BufferedOutputStream(new FileOutputStream(downloadFile1));
boolean success = client.retrieveFile(remoteFile1, outputStream1);
System.out.println(success);
outputStream1.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
client.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
Use FileOutputStream:
String filename = "test.txt";
FileOutputStream fos = new FileOutputStream(filename);
client.retrieveFile("/" + filename, fos);
Use something like this:
InputStream inputStream = client.retrieveFileStream(remoteFileNameHere);
To retrieve the remote file input stream.
Then you can use to copy the stream to desired file:
FileOutputStream out = new FileOutputStream(targetFile);
org.apache.commons.io.IOUtils.copy(in, out);
I have two audio files in MP3 format inside the user's phone
How can I mix these two sounds?
That is, I put these two sounds on top of each other and mix them, and then save the final sound in the user's phone
I looked everywhere but found nothing
this is my code:
private void mergeSongs(File mergedFile,File...mp3Files){
FileInputStream fisToFinal = null;
FileOutputStream fos = null;
try {
fos = new FileOutputStream(mergedFile);
fisToFinal = new FileInputStream(mergedFile);
for(File mp3File:mp3Files){
if(!mp3File.exists())
continue;
FileInputStream fisSong = new FileInputStream(mp3File);
SequenceInputStream sis = new SequenceInputStream(fisToFinal, fisSong);
byte[] buf = new byte[1024];
try {
for (int readNum; (readNum = fisSong.read(buf)) != -1;)
fos.write(buf, 0, readNum);
} finally {
if(fisSong!=null){
fisSong.close();
}
if(sis!=null){
sis.close();
}
}
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(fos!=null){
fos.flush();
fos.close();
}
if(fisToFinal!=null){
fisToFinal.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
I have to finish the project today......help me!
You could use SequenceInputStream.
https://docs.oracle.com/javase/8/docs/api/java/io/SequenceInputStream.html
FileInputStream fileInputStream1 = new FileInputStream("/sdcard/mp3/sound1.mp3");
FileInputStream fileInputStream2 = new FileInputStream("/sdcard/mp3/sound2.mp3");
SequenceInputStream sequenceInputStream = new SequenceInputStream(fileInputStream1, fileInputStream2);
My use case is this: when the client clicks download on a pdf, I want to edit/write some text on to the pdf using Itext pdf editor, then zip the pdf then let it download, All during the stream. I am aware of memory issue if the pdf is large etc. which won't be an issue since its like 20-50kb. I have the zipping during the stream before downloading working using byte array, now have to make the pdfeditor method also run before zipping, add some text then let the download happen.
Here is my code so far:
public class zipfolder {
public static void main(String[] args) {
try {
System.out.println("opening connection");
URL url = new URL("http://gitlab.itextsupport.com/itext/sandbox/raw/master/resources/pdfs/form.pdf");
InputStream in = url.openStream();
// FileOutputStream fos = new FileOutputStream(new
// File("enwiki.png"));
PdfEditor writepdf = new PdfEditor();
writepdf.manipulatePdf(url, dest, "field"); /// where i belive i
/// should execute the
/// editor function ?
File f = new File("test.zip");
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(f));
ZipEntry entry = new ZipEntry("newform.pdf");
zos.putNextEntry(entry);
System.out.println("reading from resource and writing to file...");
int length = -1;
byte[] buffer = new byte[1024];// buffer for portion of data from
// connection
while ((length = in.read(buffer)) > -1) {
zos.write(buffer, 0, length);
}
zos.close();
in.close();
System.out.println("File downloaded");
} catch (Exception e) {
System.out.println("Error");
e.printStackTrace();
}
}
}
public class PdfEditor {
public String insertFields (String field, String value) {
return field + " " + value;
// System.out.println("does this work :" + field);
}
// public static final String SRC = "src/resources/source.pdf";
// public static final String DEST = "src/resources/Destination.pdf";
//
// public static void main(String[] args) throws DocumentException,
// IOException {
// File file = new File(DEST);
// file.getParentFile().mkdirs();
// }
public String manipulatePdf(URL src, String dest, String field) throws Exception {
System.out.println("test");
try {
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
AcroFields form = stamper.getAcroFields();
Item item = form.getFieldItem("Name");
PdfDictionary widget = item.getWidget(0);
PdfArray rect = widget.getAsArray(PdfName.RECT);
rect.set(2, new PdfNumber(rect.getAsNumber(2).floatValue() + 20f));
String value = field;
form.setField("Name", value);
form.setField("Company", value);
stamper.close();
} catch (Exception e) {
System.out.println("Error in manipulate");
System.out.println(e.getMessage());
throw e;
}
return field;
}
}
So playing with ByteArrayOutputStream, finally got it work. passing the input stream to 'manipulatepdf' and returning 'bytedata'.
public ByteArrayOutputStream manipulatePdf(InputStream in, String field) throws Exception {
System.out.println("pdfediter got hit");
ByteArrayOutputStream bytedata = new ByteArrayOutputStream();
try {
PdfReader reader = new PdfReader(in);
PdfStamper stamper = new PdfStamper(reader, bytedata);
AcroFields form = stamper.getAcroFields();
Item item = form.getFieldItem("Name");
PdfDictionary widget = item.getWidget(0);
PdfArray rect = widget.getAsArray(PdfName.RECT);
rect.set(2, new PdfNumber(rect.getAsNumber(2).floatValue() + 20f));
String value = field;
form.setField("Name", value);
form.setField("Company", value);
stamper.close();
} catch (Exception e) {
System.out.println("Error in manipulate");
System.out.println(e.getMessage());
throw e;
}
return bytedata;
}
public String editandzip (String data, String Link) {
try {
System.out.println("opening connection");
URL url = new URL(Link);
InputStream in = url.openStream();
System.out.println("in : "+ url);
//String data = "working ok with main";
PdfEditor writetopdf = new PdfEditor();
ByteArrayOutputStream bao = writetopdf.manipulatePdf(in, data);
byte[] ba = bao.toByteArray();
File f = new File("C:/Users/JayAcer/workspace/test/test.zip");
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(f));
ZipEntry entry = new ZipEntry("newform.pdf");
entry.setSize(ba.length);
zos.putNextEntry(entry);
zos.write(ba);
zos.close();
in.close();
System.out.println("File downloaded");
} catch (Exception e) {
System.out.println("Error");
e.printStackTrace();
}
return data;
}
}
Currently am facing a problem with FileOutputStream in my code used FileOutputStream for creating file in my disk .Once file created there is no way for opening , deleting or moving file from its location ,getting error message already locked by other user When stopped web server it working properly .how can i solve this issue.
private void writeToFile(InputStream uploadedInputStream,
String uploadedFileLocation) {
try {
OutputStream out = new FileOutputStream(new File(
uploadedFileLocation));
int read = 0;
byte[] bytes = new byte[1024];
out = new FileOutputStream(new File(uploadedFileLocation));
while ((read = uploadedInputStream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
You are creating two instances of FileOutputStream and assigning both to out, but only closing one.
Remove the second out = new FileOutputStream(new File(uploadedFileLocation));.
Also, you should consider using a try-with-resources block
private void writeToFile(InputStream uploadedInputStream,
String uploadedFileLocation) {
try (OutputStream out = new FileOutputStream(new File(uploadedFileLocation))) {
int read = 0;
byte[] bytes = new byte[1024];
while ((read = uploadedInputStream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
} catch (IOException e) {
e.printStackTrace();
}
}
or finally block to ensure that the streams are closed
private void writeToFile(InputStream uploadedInputStream,
String uploadedFileLocation) {
OutputStream out = null;
try {
out = new FileOutputStream(new File(uploadedFileLocation))
int read = 0;
byte[] bytes = new byte[1024];
while ((read = uploadedInputStream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException exp) {
}
}
}
}
See The try-with-resources Statement for more details
I've got this code that downloads a .jar file from a specific URL and places it into a specific folder. The jar file downloaded is a mod for a game, meaning that it has to be downloaded and run correctly without being corrupted.
The problem is, each time I try downloading the file, it ends up being corrupted in some way and causing errors when it is loaded.
This is my download code:
final static int size=1024;
public static void downloadFile(String fAddress, String localFileName, String destinationDir, String modID) {
OutputStream outStream = null;
URLConnection uCon = null;
InputStream is = null;
try {
URL Url;
byte[] buf;
int ByteRead,ByteWritten=0;
Url= new URL(fAddress);
outStream = new BufferedOutputStream(new
FileOutputStream(destinationDir+"/"+localFileName));
uCon = Url.openConnection();
is = uCon.getInputStream();
buf = new byte[size];
while ((ByteRead = is.read(buf)) != -1) {
outStream.write(buf, 0, ByteRead);
ByteWritten += ByteRead;
}
System.out.println("Downloaded Successfully.");
System.out.println("File name:\""+localFileName+ "\"\nNo ofbytes :" + ByteWritten);
System.out.println("Writing info file");
WriteInfo.createInfoFile(localFileName, modID);
}catch (Exception e) {
e.printStackTrace();
}
finally {
try {
is.close();
outStream.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
Any ideas what is wrong with this code?
Not sure if this will solve your problem but you should flush your buffer at the end.
outStream.flush();
your code look like quite right; try this
public static void downloadFromUrl(String srcAddress, String userAgent, String destDir, String destFileName, boolean overwrite) throws Exception
{
InputStream is = null;
FileOutputStream fos = null;
try
{
File destFile = new File(destDir, destFileName);
if(overwrite && destFile.exists())
{
boolean deleted = destFile.delete();
if (!deleted)
{
throw new Exception(String.format("d'ho, an immortal file %s", destFile.getAbsolutePath()));
}
}
URL url = new URL(srcAddress);
URLConnection urlConnection = url.openConnection();
if(userAgent != null)
{
urlConnection.setRequestProperty("User-Agent", userAgent);
}
is = urlConnection.getInputStream();
fos = new FileOutputStream(destFile);
byte[] buffer = new byte[4096];
int len, totBytes = 0;
while((len = is.read(buffer)) > 0)
{
totBytes += len;
fos.write(buffer, 0, len);
}
System.out.println("Downloaded successfully");
System.out.println(String.format("File name: %s - No of bytes: %,d", destFile.getAbsolutePath(), totBytes));
}
finally
{
try
{
if(is != null) is.close();
}
finally
{
if(fos != null) fos.close();
}
}
}