Java：如何检测（和更改？）System.console 的编码？
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Java: How to detect (and change?) encoding of System.console?
提问by Epaga
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:
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 上以 ? 的形式输出。这是一个简单的测试程序：
public static void main( String[] args ) {
System.out.println("h?h??ü?");
System.console().printf( "h?h??ü?" );
}
On a default Mac console (with default UTF-8 encoding), this prints:
在默认的 Mac 控制台上（使用默认的 UTF-8 编码），它会打印：
h?h????
h?h????
But after manually setting the Mac terminal's encoding to "Mac OS Roman", it correctly printed
但是在手动将 Mac 终端的编码设置为“Mac OS Roman”后，它正确打印
h?h??ü?
h?h??ü?
Note that on Windows systems using System.console() works:
请注意，在 Windows 系统上使用 System.console() 工作：
h÷h÷?3?
h?h??ü?
So how do I make my program...rolleyes..."run everywhere"?
那么我如何让我的程序... rolleyes...“到处运行”？
采纳答案by gamma
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.
Epaga：看看这里。您可以在打印流中设置输出编码 - 只需确定或绝对确定正在设置的编码。
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
public class Test {
public static void main (String[] argv) throws UnsupportedEncodingException {
String unicodeMessage =
"\u7686\u3055\u3093\u3001\u3053\u3093\u306b\u3061\u306f";
PrintStream out = new PrintStream(System.out, true, "UTF-8");
out.println(unicodeMessage);
}
}
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:
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：
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=
回答by Bozho
Try the following command-line argument when starting your application:
在启动应用程序时尝试以下命令行参数：
-Dfile.encoding=utf-8
-Dfile.encoding=utf-8
This changes the default encoding of the JVM for I/O operations.
这会更改 JVM 用于 I/O 操作的默认编码。
You can also try:
您也可以尝试：
System.setOut(new PrintStream(System.out, true, "utf-8"));
