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“UTF-8” encoding is not working in java build [closed]

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I saved my Java source file specifying it's encoding type as UTF-8 in my eclipse. It is working fine in eclipse.
When I create a build with maven & execute it in my system Unicode characters are not working.
This is my code :
byte[] bytes = new byte[dataLength];
buffer.readBytes(bytes);
String s = new String(bytes, Charset.forName("UTF-8"));
System.out.println(s);
Eclipse console & windows console screenshot attached.
Expecting eclipse output in other systems(windows command prompt, powershell window, Linux machine, etc.,).

You could use the Console class for that.The following code could give you some inspiration:
public class Foo {
public static void main(String[] args) throws IOException {
String s = "öäü";
write(s);
}
private static void write(String s) throws IOException {
String encoding = new OutputStreamWriter(System.out).getEncoding();
Console console = System.console();
if (console != null) {
// if there is a console attached to the jvm, use it.
System.out.println("Using encoding " + encoding + " (Console)");
try (PrintWriter writer = console.writer()) {
writer.write(s);
writer.flush();
}
} else {
// fall back to "normal" system out
System.out.println("Using encoding " + encoding + " (System out)");
System.out.print(s);
}
}
}
Tested on Windows 10(poowershell), Ubuntu 16.04(bash) with default settings. Also works from within IntelliJ (Windows and Linux).

From what I can tell, you either have the wrong character, which I don't think is the case, or you are trying to display it on a terminal that doesn't handle the character. I have written a short test to separate the issues.
public static void main(String[] args){
String testA = "ֆޘᜅᾮ";
String testB = "\u0586\u0798\u1705\u1FAE";
System.out.println(testA.equals(testB));
System.out.println(testA);
System.out.println(testB);
try(BufferedWriter check = Files.newBufferedWriter(
Paths.get("uni-test.txt"),
StandardCharsets.UTF_8,
StandardOpenOption.CREATE,
StandardOpenOption.TRUNCATE_EXISTING) ){
check.write(testA);
check.write("\n");
check.write(testB);
check.close();
} catch(IOException ioc){
}
}
You could replace the values with the characters you want.
The first line should print out true if the string is the actual string you want. After that it is a matter of displaying the characters. For example if I open the text file with less then half of them are broken. If I open it with firefox, then I see all four characters, but some are wonky. You'll need a font that has characters for the corresponding unicode value.
One thing you can do is open the file in a word processor and select a font that displays the characters you want correctly.
As suggested by the OP, including the -Dfile.encoding=UTF8causes the characters to display correctly when using System.out.println. Similar to this question which changes the encoding of System.out.

Why can't I read all lines of a file in java? [closed]

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I'm trying to make a text editor in Java, but I can't seem to get the "open file" feature to work. When I run the code, it only displays the first line of a file. I've tried all of the code snippets from: How to read a large text file line by line using Java?, but it still reads the first line only.
This is what I have tried:
JMenuItem mntmOpen = new JMenuItem("Open");
mntmOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5, 0));
mntmOpen.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == mntmOpen) {
int returnVal = fc.showOpenDialog(null);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//This is where a real application would open the file.
Path HI = file.toPath();
try( Stream<String> lines = Files.lines(HI)
){
for( String line : (Iterable<String>) lines::iterator )
{
editorPane.setText(line);
}
}catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
});

Check out this answer here, you should be able to use the section in the while loop. Pretty straight forward run until null which basically states that the buffer will continue to read until the reader sends back a null pointer in which case there is nothing left in the file. If this doesn't work then we can take a look at it again. Also you got downvoted for asking a question without searching for an answer first. https://www.caveofprogramming.com/java/java-file-reading-and-writing-files-in-java.html

Get something like Resultset from data file [closed]

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I want to read a delimiter-separated or fixed-width file (of defined layout), and want to get something like a Resultset through which I can iterate throgh the record.
Is there any reliable library for doing this? If not then can anyone please suggest me how I should proceed? An example code snippet will be very helpful to me.

You can use java ios to iterate each line in the text file and then implement your own logic to split the line and do as desired.
public static void main(String args[]) throws Exception {
//input file
File inputFile = new File("c:/hadoop/sample.txt");
BufferedReader br = new BufferedReader(new FileReader(inputFile));
String s = null;
while ((s = (br.readLine())) != null) {
//check each line and do the logic may be split or based on the requirement
String cols[] =s.split("|");
}
}

public static Stream<String> lines(Path path)
throws IOException
Read all lines from a file as a Stream. Bytes from the file are decoded into characters using the UTF-8 charset.
This method works as if invoking it were equivalent to evaluating the expression:
Files.lines(path, StandardCharsets.UTF_8)
Parameters:
path - the path to the file
Returns: the lines from the file as a Stream
Throws:
IOException - if an I/O error occurs opening the file
SecurityException - In the case of the default provider, and a security manager is installed, the checkRead method is invoked to check read access to the file.
Since: 1.8
Files.lines(Path) expects a Path argument and returns a Stream<String>.
This is Java 8, so you can use lambda expressions or method references to provide a Consumer argument.
public class FixedWidthFile {
public static void main(String JavaLatte[]) {
Path path = Paths.get("/home/sample.txt");
try {
Stream<String> lines = Files.lines(path);
lines.forEach(s -> System.out.println(s));
} catch (IOException ex) {
}
}
}
Reference: Class Files

Java File file = new file not working ; cannot find symbol [closed]

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Closed 8 years ago.
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At the moment I'm making a HangMan GUI game in Java. It works when I put the words right into the program.
But now I want to load a textfile and create a string of it, in the code below the string content.
Here on StackOverflow I have read about the use of scanners.
Now I have this code, but it won't accept the File file = new File("woordenlijst.txt"); statement, it says at 'File' that it cannot find symbol. Can you help me? this is my code:
import java.util.Scanner;
public class galgjeGUI extends javax.swing.JFrame {
/**
* Creates new form galgjeGUI
*/
private String wGalg; // het te raden woord
private int fouten; // globale variabele toegevoegd jonp
private int pogingen;
private int levens = 7;
public galgjeGUI() {
initComponents();
buttonDisableFunction();
File file = new File("woordenlijst.txt");
Scanner scan = new Scanner(file);
scan.useDelimiter("\\Z");
String content = scan.next();
}

how does java know what you mean by File, there is no class called File, you are looking for java.io.File so tell compiler to use that by adding
import java.io.File;

1) Import proper packages.
2) Handle exceptions.
3) close() Scanner object after usage.
import java.io.*; //import
Scanner scan = null;
try { //handle exceptions
File file = new File("woordenlijst.txt");
scan = new Scanner(file);
}
catch(FileNotFoundException e) {
System.out.println(e);
}
finally {
scan.close(); // give up the resource.
}

How to write data to a text file in Java [closed]

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I'm creating a sport prediction game for my Grade 11 year and I'm having issues writing data to a text file. I'm using NetBeans 7.3.1. I'm using a button where every time it is pressed data entered by the user must be written to the text file. The text file is empty in the beginning and I need to add data to it. After the first click on the button the data keep rewriting itself and the new data is not added. It needs to be in a new line each time. Thank you very much. Some coding would be awesome!

I just did a quick search for appending to a file (usually a good thing to do): this question seems to be what your looking for.

I haven't tested this, but this should work:
private boolean appendToFile(String fileName, String data, String lineSeparator)
throws IOException {
FileWriter writer = null;
File file = new File(fileName)
if (!file.exists()) {
file.createNewFile();
}
try {
writer = new FileWriter(fileName, true);
writer.append(data);
writer.append(lineSeparator);
} catch (IOException ioe) {
return false;
} finally {
if (writer != null) {
writer.close();
}
}
return true;
}