Java, UTF-8, and Windows console

Question

We try to use Java and UTF-8 on Windows. The application writes logs on the console, and we would like to use UTF-8 for the logs as our application has internationalized log

Answer 1

Java on windows does NOT support unicode ouput by default. I have written a workaround method by calling Native API with JNA library.The method will call WriteConsoleW for unicode output on the console.

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.StdCallLibrary;

/** For unicode output on windows platform
 * @author Sandy_Yin
 * 
 */
public class Console {
    private static Kernel32 INSTANCE = null;

    public interface Kernel32 extends StdCallLibrary {
        public Pointer GetStdHandle(int nStdHandle);

        public boolean WriteConsoleW(Pointer hConsoleOutput, char[] lpBuffer,
                int nNumberOfCharsToWrite,
                IntByReference lpNumberOfCharsWritten, Pointer lpReserved);
    }

    static {
        String os = System.getProperty("os.name").toLowerCase();
        if (os.startsWith("win")) {
            INSTANCE = (Kernel32) Native
                    .loadLibrary("kernel32", Kernel32.class);
        }
    }

    public static void println(String message) {
        boolean successful = false;
        if (INSTANCE != null) {
            Pointer handle = INSTANCE.GetStdHandle(-11);
            char[] buffer = message.toCharArray();
            IntByReference lpNumberOfCharsWritten = new IntByReference();
            successful = INSTANCE.WriteConsoleW(handle, buffer, buffer.length,
                    lpNumberOfCharsWritten, null);
            if(successful){
                System.out.println();
            }
        }
        if (!successful) {
            System.out.println(message);
        }
    }
}