Java:如何检测(和更改?) System.console 的编码?

问题描述

我有一个在控制台上运行的程序，它的元音变音和其他特殊字符在 Mac 上输出为?这是一个简单的测试程序:

I have a program which runs on a console and its Umlauts and other special characters are being output as ?'s on Macs. Here's a simple test program:

public static void main( String[] args ) {
    System.out.println("höhößüä");
    System.console().printf( "höhößüä" );
}

在默认的 Mac 控制台(使用默认的 UTF-8 编码)上，会打印:

On a default Mac console (with default UTF-8 encoding), this prints:

 h?h????
 h?h????

但是手动设置Mac终端的编码为Mac OS Roman"后，打印正确

But after manually setting the Mac terminal's encoding to "Mac OS Roman", it correctly printed

 höhößüä
 höhößüä

请注意，在 Windows 系统上使用 System.console() 有效:

Note that on Windows systems using System.console() works:

 h÷h÷▀³õ
 höhößüä

那么我该如何让我的程序...rolleyes...到处运行"?

So how do I make my program...rolleyes..."run everywhere"?

推荐答案

Epaga: 看看吧这里.您可以在打印流中设置输出编码 - 只需确定或绝对确定要设置的编码.

Epaga: have a look right here. You can set the output encoding in a printstream - just have to determine or be absolutely sure about which is being set.

import java.io.PrintStream;
import java.io.UnsupportedEncodingException;

public class Test {
    public static void main (String[] argv) throws UnsupportedEncodingException {
    String unicodeMessage =
    "u7686u3055u3093u3001u3053u3093u306bu3061u306f";

    PrintStream out = new PrintStream(System.out, true, "UTF-8");
    out.println(unicodeMessage);
  }
}

要确定控制台编码，您可以使用系统命令locale"并解析输出 - 在德国 UTF-8 系统上，如下所示:

To determine the console encoding you could use the system command "locale" and parse the output which - on a german UTF-8 system looks like:

LANG="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_CTYPE="de_DE.UTF-8"
LC_MESSAGES="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_ALL=

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