为什么用Java和AIX执行该简单程序会导致回车/换行文件不同? [英] Why this simple program leads to different carriage return/line feed file when executed in Java and AIX?

问题描述

如果我在Windows 7上然后在AIX(Unix系统)上运行此简单程序，并使用诸如Winmerge或Compare It之类的工具比较两个生成的文件，它会告诉我回车和换行符不同，但是内容相同.

If I run this simple program on Windows 7 and then on AIX (Unix system) and compare the two generated files using a tool such as Winmerge or Compare It, it tells me that the Carriage Return and Line Feed are different but the content identical.

• 那是为什么?如果在这种情况下都使用相同的编码"UTF-8"，那应该不一样吗?

• Why is that? Isn't supposed to be the same if both use the same encoding "UTF-8" in this case?

如何使两个文件完全相等?

How can I make both files totally equal?

public class WriteFile {

    public static void main(String[] args) throws IOException {
        write();

    }

    public static void write() throws IOException {
        File file = new File("/tmp/test.txt");
        file.delete();
        file.createNewFile();
        String str = "hello";
        FileOutputStream fileOs = new FileOutputStream(file);
        PrintWriter writer = new PrintWriter(new OutputStreamWriter(fileOs, "UTF-8"), true);
        writer.println(str);
        writer.close();
    }

}

推荐答案

不同的操作系统使用不同的换行符:

Different operating systems use different newline conventions:

• 在Windows上，换行符为CR+LF;
• 在Unix上，换行符为LF.

• On Windows, newlines are CR+LF;
• On Unix, newlines are LF.

(如果您感到好奇，可以使用更多.)

(If you're curious, there's more.).

如果需要输出文件相同，请不要使用println()，而应使用\n或\r\n代替:

If you need the output files to be identical, don't use println(), but write \n or \r\n instead:

writer.printf("%s\n", str);   // LF
writer.printf("%s\r\n", str); // CR+LF

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