Java：如何检测（和更改？）System.console的编码？ [英] Java: How to detect (and change?) encoding of System.console?

问题描述

我有一个在控制台上运行的程序，它的Umlauts和其他特殊字符正在Mac上输出。这是一个简单的测试程序：

  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） ：

  h？h ???? 
 h？h ????但是，在将Mac终端的编码手动设置为Mac OS Roman之后，它正确地打印出来。
  

>

 höhößüä
höhößüä
  

请注意，在使用System.console（）的Windows系统上工作：

  h÷h÷▀³õ
höhößüä
  

那么如何使我的程序... rolleyes ...无处不在？

解决方案

Epaga：看起来很正确这里。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输出。

  import java .io.PrintStream; 
 import java.io.UnsupportedEncodingException; 
 
 public class Test {
 public static void main（String [] argv）throws UnsupportedEncodingException {
 String unicodeMessage = 
\\\皆\\\さ\\\ん \\\、\\\こ\\\ん\\\に\\\ち\\\は; 
 
 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，并分析在德国的UTF-8系统中的输出：

  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 = 
  

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" );
}

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

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

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

 höhößüä
 höhößüä

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

 h÷h÷▀³õ
 höhößüä

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

解决方案

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 =
    "\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:

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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