Scanner vs System.console（）。write（） [英] Scanner vs System.console( ).write( )

问题描述

我试图在屏幕上打印出包含西班牙语重音的字符串。
我用相同的输入得到不同的答案，但采用不同的方法。

I tried to print out a string that includes Spanish accents on the screen. I get different answer with the same input, but with different approaches.

我的第一种方法是通过扫描仪课程读取包含西班牙语口音的字符串

My first approach is to read a string that includes Spanish accents via Scanner class

 //input is a á e é i í o ó u ú A Á E É I Í O Ó U Ú Ñ ñ

    Scanner sc = new Scanner(System.in);
    System.out.println("Enter some spanish chars next: ");
    String spanishLine = sc.nextLine();

    try {
        System.out.println("Output from Scanner: " + spanishLine);
        System.console().writer().println(spanishLine);
    } catch (Exception e) {

    }

我的第二个apporche是我从这个网站找到的： http://www.rgagnon.com/javadetails /java-0046.html

My second apporche is which I found from this webiste: http://www.rgagnon.com/javadetails/java-0046.html

        String s = "a á e é i í o ó u ú A Á E É I Í O Ó U Ú Ñ ñ";

        try {
            System.out.println("Output from System.console: " + s);
            System.console().writer().println(s);
        } catch (Exception e) {

        }

我的out come如下

My out come is as follows

Enter some spanish chars next: 
a á e é i í o ó u ú A Á E É I Í O Ó U Ú Ñ ñ
output from Scanner: a � e � i � o � u � A � E � I � O � U � � �
output from System.console: a á e é i í o ó u ú A Á E É I Í O Ó U Ú Ñ ñ

任何人都可以解释为什么我从同一输入中得到两个不同的答案。
如何修复我的第一种方法以获得与第二种方法相同的结果？

Can anyone explain why I get two different answers from the same input. How can I fix up my first approach to have same result as the second one?

推荐答案

不是答案

Not an answer

你还需要检查一些东西。

You still need to check some things.

1. java编译器使用的java源代码编码必须与文本/编辑器的编码相同。

1. The java source encoding used by the java compiler must be the same as the encoding of the text/editor.

• 您可以使用程序员的编辑器（如JEdit或NotePad ++）进行检查。

检查默认编码：

• System.out.println（System.getProperty（file.encoding））;


• 或者向扫描器构造函数添加额外的编码参数


• 原因是，通常有一个没有编码的方法/构造函数版本采用默认的平台编码。

将System.out / console重定向到文件。

Redirect the System.out/console to a file.

• 在这种情况下，将字符串写入UTF就足够了-8。

尝试真正的控制台，而不是IDE的。

• IDE控制台的编码可以配置。

我发现行为令人费解。它看起来好像Scanner采用编码UTF-8的字符集然后必须将其写入US-ASCII，因此umappable字符由 给出。那不可能。看起来Scanner会马车 - 我怀疑。

I find the behaviour puzzling. It would look as if the Scanner took a charset encoding UTF-8 and then had to write it to US-ASCII, so umappable characters are given by �. That cannot be. It looks like Scanner would be "buggy" - which I doubt.

尝试转储字符串：

for (int i = 0; i < s.length(); ) {
    int cp = s.codePointAt(i);
    System.out.printf(" %x", cp);
    i += Character.charCount(cp);
}
System.out.println();

---

（通常没有完成） ）

---

(Normally not done)

System.setProperty("file.encoding","Windows-1252");

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