Develop Reference

Java status 400 for URL

Hello - I'm trying to download a file using Apache commons fileUtils but it always ends up getting a 400 error. The file's URL is valid because I successfully downloaded it many times using the browser. Any ideas?
java.io.IOException: Server returned HTTP response code: 400 for URL:
http://www.nikaia-hosp.gr/img/ΤΕΛΙΚΕΣ ΠΡΟΔΙΑΓΡΑΦΕΣ ΓΙΑ ΥΠΕΡΗΧΟ
ΓΥΝΑΙΚΟΛΟΓΙΚΟ ΜΑΙΕΥΤΙΚΟ ΠΡΟΓΕΝΝΗΤΙΚΟΥ ΕΛΕΓΧΟΥ.pdf at
sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at java.net.URL.openStream(URL.java:1045) at
org.apache.commons.io.FileUtils.copyURLToFile(FileUtils.java:1478) at
com.nikaia.main.NikaiaReader.Downloader.download(Downloader.java:17)
at com.nikaia.main.NikaiaReader.Downloader.main(Downloader.java:32)
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.commons.io.FileUtils;
public class Downloader {
public static void download(String url,String filename){
//System.out.println("filename is : "+filename);
try {
// FileUtils.copyURLToFile(new URL(url), new File("C:/downloads/"+filename));
FileUtils.copyURLToFile(new URL(url), new File(PropertyReader.readProperty("ExtractedFilesPath")+"/"+filename));
try {
Thread.sleep(Integer.parseInt(PropertyReader.readProperty("downloadTimeout"))*1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String ar[]){
download("http://www.nikaia-hosp.gr/img/ΤΕΛΙΚΕΣ ΠΡΟΔΙΑΓΡΑΦΕΣ ΓΙΑ ΥΠΕΡΗΧΟ ΓΥΝΑΙΚΟΛΟΓΙΚΟ ΜΑΙΕΥΤΙΚΟ ΠΡΟΓΕΝΝΗΤΙΚΟΥ ΕΛΕΓΧΟΥ.pdf","stupid.pdf");
}
}

OK answer found , I checked the encoded browser url and the url that UTF-8 java returns and the difference was that browser had %20 in the url but java had + .
I replaced all + with %20 in java and its working.
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import org.apache.commons.io.FileUtils;
public class Downloader {
public static void download(String url, String filename) {
try {
String base = "http://www.nikaia-hosp.gr/img/";
if (url.contains("http://www.nikaia-hosp.gr/img/")) {
FileUtils.copyURLToFile(
new URL(base + URLEncoder.encode(url.replace(base, ""), "UTF-8").replaceAll("\\+", "%20")),
new File(PropertyReader.readProperty("ExtractedFilesPath") + "/" + filename));
} else {
FileUtils.copyURLToFile(new URL(url),
new File(PropertyReader.readProperty("ExtractedFilesPath") + "/" + filename));
}
try {
Thread.sleep(Integer.parseInt(PropertyReader.readProperty("downloadTimeout")) * 1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String ar[]) {
download(
"http://www.nikaia-hosp.gr/img/ΤΕΛΙΚΕΣ ΠΡΟΔΙΑΓΡΑΦΕΣ ΓΙΑ ΥΠΕΡΗΧΟ ΓΥΝΑΙΚΟΛΟΓΙΚΟ ΜΑΙΕΥΤΙΚΟ ΠΡΟΓΕΝΝΗΤΙΚΟΥ ΕΛΕΓΧΟΥ.pdf",
"stupid.pdf");
}
}

this work for me, the problem was the encoding, you need encode only the path of the url
InputStream in = new URL(url).openStream();
FileUtils.copyToFile(in,new File(filename));
first open a Stream with the url and then copy this stream data in a file. using copyToFile method
your code will be
public static void download(String url,String filename){
try {
//changed this 2 lines
URL encodeUrl = new URL(UriUtils.encodePath(url, "UTF-8"));
InputStream in = encodeUrl.openStream();
FileUtils.copyToFile(in, new File(PropertyReader.readProperty("ExtractedFilesPath")+"/"+filename));
try {
Thread.sleep(Integer.parseInt(PropertyReader.readProperty("downloadTimeout"))*1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String ar[]){
download("http://www.nikaia-hosp.gr/img/ΤΕΛΙΚΕΣ ΠΡΟΔΙΑΓΡΑΦΕΣ ΓΙΑ ΥΠΕΡΗΧΟ ΓΥΝΑΙΚΟΛΟΓΙΚΟ ΜΑΙΕΥΤΙΚΟ ΠΡΟΓΕΝΝΗΤΙΚΟΥ ΕΛΕΓΧΟΥ.pdf","stupid.pdf");
}
and add this dependency to your pom.xml
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.0.4.RELEASE</version>
</dependency>
this does the magic.
UriUtils.encodePath(host+path, "UTF-8");

How to write into the USB (External storage)

I am trying to copy a file from my computer to USB in java. The problem is, the code creates a file on the Usb but the content of the file is not copied from source to destination(computer to usb). How can i do that?
I want the filename R.java to be copied into the usb as system.txt.
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
public class R {
private static File to;
public static void main(String[] args) {
// current working dir where there is file u want to replicate
File f = new File("." + "/R.java");
// destination location
File so = new File("/media");
for (File s : so.listFiles()) {
String r = s.getName();
to = new File("/media/" + r + "/system.txt");
if (!to.exists()) {
try {
to.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
System.out
.print(to.getName() + " " + e.getMessage() + "\n");
}
}
if (f.exists()) {
FileChannel is = null;
FileChannel os = null;
try {
is = new FileInputStream(f).getChannel();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
os = new FileOutputStream(to).getChannel();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
os.transferFrom(is, 0, is.size());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
I am on LINUX machine

Java read file with scanner

I have this code that have some methods for creating a file, adding data to the file and then read the file with scanner.
My problem is that I want it to run my three methods at once but it stops
at the method number two and does not read the file with readFile() method
createFile();
addResponses(file);
readFile(file);
I can not run these three together. It does not read the file. But if I take
the other methods away like this
//createFile();
//addResponses(file);
readFile(file);
Then the read file method works.
I hope you did understand my problem. Is there something wrong with my code?
import java.io.*;
import java.util.Formatter;
import java.util.Scanner;
import javax.swing.JOptionPane;
public class Main {
static Formatter f;
static String sträng = " ";
static BufferedWriter output;
static File file;
static int nummer = 1;
static int counter = 0;
static private StringBuffer strBuff;
static InputStream is;
static FileWriter fw;
/**
* #param args the command line arguments
*/
public static void main(String[] args) throws Exception {
createFile();
addResponses(file);
readFile(file);
}
public static int addResponse() {
if (nummer == 6) {
try {
output.close();
} catch (IOException ex) {
JOptionPane.showMessageDialog(null, ex.getMessage());
}
System.exit(0);
}
sträng = JOptionPane.showInputDialog("Numbers 1-5 to number " + nummer");
try {
return Integer.parseInt(sträng);
} catch (NumberFormatException f) {
return 6;
}
}
public static File createFile() {
try {
file = new File("numbers.txt");
f = new Formatter(file);
f.close();
} catch (SecurityException se) {
System.err.println("You dont have write access to this file");
System.exit(1);
} catch (Exception ex) {
System.err.println("Error opening or creating file");
System.exit(1);
}
return file;
}
public static void readFile(File x) {
try {
x = new File("numbers.txt");
Scanner in = new Scanner(x);
while (in.hasNextLine()) {
System.out.println(in.nextLine());
}
in.close();
} catch (Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
public static void addResponses(File f) throws IOException {
try {
fw = new FileWriter(f, true);
output = new BufferedWriter(fw);
int x = addResponse();
if (nummer == 1) {
output.write(String.format("%s%10s\n", "Rating", " Frequency"));
}
while (x != -1) {
if (x > 0 && x < 6) {
output.write(String.format("%s%10s\n", nummer, sträng));
nummer++;
} else {
JOptionPane.showMessageDialog(null, "Input only numbers between 1-5");
}
x = addResponse();
}
output.close();
} catch (IOException io) {
JOptionPane.showMessageDialog(null, "Wrong");
}
}
}

after playing around with the code, I found out that in your addResponse() method , you have added System.exit(0); so baiscally program was terminating. I've change it to return -1 and it seems to be working.
by the way, this is a very bad coding practice, each method should do stuff seperately regarless of other method. in your case everything is so integerated that is very hard to root the problem. I recommend you looking at some coding convention.
this is how addResponse() method should be working:
public static File createFile() {
try {
file = new File("numbers.txt");
f = new Formatter(file);
f.close();
} catch (SecurityException se) {
System.err.println("You dont have write access to this file");
System.exit(1);
} catch (Exception ex) {
System.err.println("Error opening or creating file");
System.exit(1);
}
return file;
}

Decompress files with .7z extension in java

Can someone advice (give example) any appropriate and understandable way how to extract file or files with .7z extension basing upon InputStream. I have been examined the XZ for java api, but couldn't succeed. Waiting for any suggestion.

This code might help you.
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Arrays;
import net.sf.sevenzipjbinding.ExtractOperationResult;
import net.sf.sevenzipjbinding.ISequentialOutStream;
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 unzip {
public static void main(String[] args) {
RandomAccessFile randomAccessFile = null;
ISevenZipInArchive inArchive = null;
try {
randomAccessFile = new RandomAccessFile("oclHashcat-plus-0.14.7z", "r");
inArchive = SevenZip.openInArchive(null, // autodetect archive type
new RandomAccessFileInStream(randomAccessFile));
// Getting simple interface of the archive inArchive
ISimpleInArchive simpleInArchive = inArchive.getSimpleInterface();
System.out.println(" Hash | Size | Filename");
System.out.println("----------+------------+---------");
for (final ISimpleInArchiveItem item : simpleInArchive.getArchiveItems()) {
final int[] hash = new int[] { 0 };
if (!item.isFolder()) {
ExtractOperationResult result;
final long[] sizeArray = new long[1];
result = item.extractSlow(new ISequentialOutStream() {
public int write(byte[] data) throws SevenZipException {
//Write to file
FileOutputStream fos;
try {
File file = new File(item.getPath());
file.getParentFile().mkdirs();
fos = new FileOutputStream(file);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
hash[0] ^= Arrays.hashCode(data); // Consume data
sizeArray[0] += data.length;
return data.length; // Return amount of consumed data
}
});
if (result == ExtractOperationResult.OK) {
System.out.println(String.format("%9X | %10s | %s", //
hash[0], sizeArray[0], item.getPath()));
} else {
System.err.println("Error extracting item: " + result);
}
}
}
} 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);
}
}
}
}
}

Program in java that reads data from a text file

date time kg
12/10/2013 00.00.01 1
13/11/2013 00.00.05 2
17/12/2013 00.00.90 5
21/12/2013 00.00.23 6
27/12/2013 00.00.43 9
I have these data in an txt file. I would like to make o program in java that would read these data. I ' ve written the code above but I have mistakes. Could someone help me? The data have space between each other.
import java.io*;
public class ReadTextfile{
public static void main (String[] args) {
File file = new File ("test.txt");
StringBuilder line = new StringBuilder();
BufferedReader reader = null;
try {
reader = new BufferedReader (new FileReader(file));
String text = null;
while ((text = reader.readLine()) !=null) {
line.append(text)
.append(System.getProperty ("line.separator"));
}
}
catch (IOException e) {
e.printStackTrace();
catch (FileNotFoundException e) {
e.printStackTrace();
}finally {
try {
if (reader !=null){
reader.close();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
System.out.println(line.toString());
}
}

boy you are only having some syntax problem
1 : replace
import java.io* with import java.io.*
2 : take care of your catch body being started and closed properly
try
{
// your code
}
catch(Exception e)
{
}
here is the working code , compare your program
import java.io.*;
public class ReadTextfile{
public static void main (String[] args)
{
File file = new File ("C:/Users/hussain.a/Desktop/test.txt");
StringBuilder line = new StringBuilder();
BufferedReader reader = null;
try {
reader = new BufferedReader (new FileReader(file));
String text = null;
while ((text = reader.readLine()) !=null) {
line.append(text)
.append(System.getProperty ("line.separator"));
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
try {
if (reader !=null){
reader.close();
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
System.out.println(line.toString());
}
}

catch (FileNotFoundException e)
This is unreachable code, since above it you caught IOException.
Note that:
public class FileNotFoundException extends IOException
Your code won't compile. Remove this catch (You didn't even close it..)
Another thing, if this is not a type, you should replace java.io* with import java.io.*.

I would take the following approach:
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class ReadTextFile
{
public static void main(String[] args) throws FileNotFoundException
{
File file = new File("test.txt");
Scanner scanner = new Scanner(file);
List<Result> results = new ArrayList<Result>();
while(scanner.hasNextLine())
{
String currentLine = scanner.nextLine();
String [] resultArray = currentLine.split(" ");
results.add(new Result(resultArray[0], resultArray[1], resultArray[2]));
}
scanner.close();
}
private static class Result
{
private String date;
private String time;
private String kg;
public Result(String date, String time, String kg)
{
super();
this.date = date;
this.time = time;
this.kg = kg;
}
public String getDate()
{
return date;
}
public String getTime()
{
return time;
}
public String getKg()
{
return kg;
}
}
}
Now you can pull out any information that you want to from the list of results that you have.
So if you wanted to print everything, you could do the following:
for(Result singleResult : results)
{
System.out.println(singleResult.getDate() + " " + singleResult.getTime() + " " + singleResult.getKg());
}
You basically can do whatever you want to with the data. This approach would also allow you to transform the data into different types before you even create the Result object.