如何写文件UTF8？

Question

I think I need to use

BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName), "UTF8"));

But when I change my code to BufferedWriter, then something is wrong with the line out.write(e); .

My code:

public void writeToFile(String fileName, List<ThongtinKhachThue> resultttkt){
        System.out.println("Begin....");
        try {
            PrintWriter out = new PrintWriter(new File(fileName));
            out.println("//thue.txt");
            for(ThongtinKhachThue e : resultttkt){
                    out.println(e);                 
            }
            out.println("Tổng khách thuê phòng: "+TongKhachThue());
            out.println("Tổng tiền thu: "+TongTienThuDuoc()+"$");
            out.flush();
            out.close();
            System.out.println("End...");
        } catch (FileNotFoundException e) {
            System.err.println(e.getMessage());
            e.printStackTrace();
        }
    }

what it shows in file:

//thue.txt
K1, A1002, 47.05$ 
K2, A0003, 67.0$ 
K3, A1001, 31.0$ 
K4, null, 0.0$ 
T?ng khách thuê ph?ng: 3
T?ng ti?n thu: 145.05$

what I want it to show is:

//thue.txt
K1, A1002, 47.05$ 
K2, A0003, 67.0$ 
K3, A1001, 31.0$ 
K4, Không thuê
Tổng khách thuê: 03
Tổng tiền thu: 145.05$

How can i write utf-8 to file and change "3" to "03"?

Answer 1

To write 03 (leading zero) instead of 3 you can use

int myInteger = 3;
out.println("Some value: " + String.format("%02d", myInteger) );

See String.format(...) documentation for details on the syntax.

Answer 2

Use,

BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path),"UTF-8"));

that way you can set the encoding.

Answer 3

You need to use the charset names mentioned at this link

It says the standard charsets as "UTF-8" and not "UTF8".

So change it to "UTF-8" and it will work.

Below for your reference :

• US-ASCII
  Seven-bit ASCII, aka ISO646-US, aka the Basic Latin block of the Unicode character set
• ISO-8859-1
  ISO Latin Alphabet No. 1, aka ISO-LATIN-1
• UTF-8
  Eight-bit UCS Transformation Format
• UTF-16BE
  Sixteen-bit UCS Transformation Format, big-endian byte order
• UTF-16LE
  Sixteen-bit UCS Transformation Format, little-endian byte order
• UTF-16
  Sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order mark

Answer 4

Try this

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

Answer 5

Since you already know that you should use a BufferedWriter since it let's you chose the encoding I do not see what's the problem here.

I would only like to add that instead of writing "UTF8" as a string which is error prone you can use, as of Java 1.7, the class StandardCharsets to get, well, all the standard charsets :-)

If Java 1.7 isn't an option you can also use Guava's Charsets class.