文件开头有奇怪的字符？

Question

从文件中读取时，我读取的第一行有一个奇怪的字符（使用BufferedReader）。如何删除此字符？我知道我可以手动完成，但我想以正确的方式做到这一点。

图片（NetBeans输出）

Answer 1

使用OP提供的链接中的相关代码，这里是对按预期工作的问题的答案。

import java.io.*;

public class UTF8ToAnsiUtils {

    // FEFF because this is the Unicode char represented by the UTF-8 byte order mark (EF BB BF).
    public static final String UTF8_BOM = "\uFEFF";

    public static void main(String args[]) {
        try {
            if (args.length != 2) {
                System.out
                        .println("Usage : java UTF8ToAnsiUtils utf8file ansifile");
                System.exit(1);
            }

            boolean firstLine = true;
            FileInputStream fis = new FileInputStream(args[0]);
            BufferedReader r = new BufferedReader(new InputStreamReader(fis,
                    "UTF8"));
            FileOutputStream fos = new FileOutputStream(args[1]);
            Writer w = new BufferedWriter(new OutputStreamWriter(fos, "Cp1252"));
            for (String s = ""; (s = r.readLine()) != null;) {
                if (firstLine) {
                    s = UTF8ToAnsiUtils.removeUTF8BOM(s);
                    firstLine = false;
                }
                w.write(s + System.getProperty("line.separator"));
                w.flush();
            }

            w.close();
            r.close();
            System.exit(0);
        }

        catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }

    private static String removeUTF8BOM(String s) {
        if (s.startsWith(UTF8_BOM)) {
            s = s.substring(1);
        }
        return s;
    }
}