如何用Java写一个UTF-8的文件？

Question

I have some current code and the problem is its creating a 1252 codepage file, i want to force it to create a UTF-8 file

Can anyone help me with this code, as i say it currently works... but i need to force the save on utf.. can i pass a parameter or something??

this is what i have, any help really appreciated

var out = new java.io.FileWriter( new java.io.File( path )),
        text = new java.lang.String( src || "" );
    out.write( text, 0, text.length() );
    out.flush();
    out.close();

Answer 1

Instead of using FileWriter , create a FileOutputStream . You can then wrap this in an OutputStreamWriter , which allows you to pass an encoding in the constructor. Then you can write your data to that inside a try-with-resources Statement :

try (OutputStreamWriter writer =
             new OutputStreamWriter(new FileOutputStream(PROPERTIES_FILE), StandardCharsets.UTF_8))
    // do stuff
}

Answer 2

Try this

Writer out = new BufferedWriter(new OutputStreamWriter(
    new FileOutputStream("outfilename"), "UTF-8"));
try {
    out.write(aString);
} finally {
    out.close();
}

Answer 3

Try using FileUtils.write from Apache Commons.

You should be able to do something like:

File f = new File("output.txt"); 
FileUtils.writeStringToFile(f, document.outerHtml(), "UTF-8");

This will create the file if it does not exist.

Answer 4

Since Java 7 you can do the same with Files.newBufferedWriter a little more succinctly:

Path logFile = Paths.get("/tmp/example.txt");
try (BufferedWriter writer = Files.newBufferedWriter(logFile, StandardCharsets.UTF_8)) {
    writer.write("Hello World!");
    // ...
}

Answer 5

All of the answers given here wont work since java's UTF-8 writing is bugged.

http://tripoverit.blogspot.com/2007/04/javas-utf-8-and-unicode-writing-is.html

Answer 6

var out = new java.io.PrintWriter(new java.io.File(path), "UTF-8");
text = new java.lang.String( src || "" );
out.print(text);
out.flush();
out.close();

Answer 7

The Java 7 Files utility type is useful for working with files:

import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.io.IOException;
import java.util.*;

public class WriteReadUtf8 {
  public static void main(String[] args) throws IOException {
    List<String> lines = Arrays.asList("These", "are", "lines");

    Path textFile = Paths.get("foo.txt");
    Files.write(textFile, lines, StandardCharsets.UTF_8);

    List<String> read = Files.readAllLines(textFile, StandardCharsets.UTF_8);

    System.out.println(lines.equals(read));
  }
}

The Java 8 version allows you to omit the Charset argument - the methods default to UTF-8.

Answer 8

we can write the UTF-8 encoded file with java using use PrintWriter to write UTF-8 encoded xml

Or Click here

PrintWriter out1 = new PrintWriter(new File("C:\\abc.xml"), "UTF-8");

Answer 9

Below sample code can read file line by line and write new file in UTF-8 format. Also, i am explicitly specifying Cp1252 encoding.

    public static void main(String args[]) throws IOException {

    BufferedReader br = new BufferedReader(new InputStreamReader(
            new FileInputStream("c:\\filenonUTF.txt"),
            "Cp1252"));
    String line;

    Writer out = new BufferedWriter(
            new OutputStreamWriter(new FileOutputStream(
                    "c:\\fileUTF.txt"), "UTF-8"));

    try {

        while ((line = br.readLine()) != null) {

            out.write(line);
            out.write("\n");

        }

    } finally {

        br.close();
        out.close();

    }
}

Answer 10

Here is an example of writing UTF-8 characters in the Eclipse IDE and to a File.

For Eclipse.simply set the Encoding to UTF-8 from Run -> Run Configurations -> Common Common Dialog

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;

public class UTF_8_Example {

    /**
     * Example of printing UTF-8 characters inside Eclipse IDE and a File.
     * <p>
     * For eclipse, you must go to Run ->  Run Configurations -> Common 
     * and set Encoding to UTF-8.
     * <p>
     * @param args
     */
    public static void main(String[] args) {
        BufferedWriter writer = null;

        try {
            ///////////////////////////////////////////////////////////////////
            // WRITE UTF-8 WITHIN ECLIPSE EDITOR
            ///////////////////////////////////////////////////////////////////         
            char character = '►';
            int code = character;
            char hex = '\u25ba';
            String value = "[" + Integer.toHexString(code) + "][\u25ba][" + character + "][" + (char)code + "][" + hex + "]";
            System.out.println(value);

            ///////////////////////////////////////////////////////////////////
            // WRITE UTF-8 TO A FILE
            ///////////////////////////////////////////////////////////////////
            File file = new File("UTF_8_EXAMPLE.TXT");
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, "UTF-8");
            writer = new BufferedWriter(outputStreamWriter);
            writer.write(value);
        }
        catch(Throwable e) {
            throw new RuntimeException(e);
        }
        finally {
            try {
                if(writer != null) { writer.close(); }
            }
            catch(Throwable e) {
                throw new RuntimeException(e);              
            }
        }
    }   
}