Java文件编码转换 [英] Java file encoding conversion

问题描述

我需要将文件的编码从ANSI（Windows-1252）更改为UTF8。我写下面的程序通过java来做到这一点。该程序将字符转换为UTF8，但是当我以notepade ++打开文件时，编码类型显示为ANSI为UTF8。当我在访问数据库中导入此文件时，这会给我错误。只需要具有UTF8编码的文件。此外，要求是在任何编辑器中转换文件而不打开它。

I have a requirement to change the encoding of a file from ANSI(windows-1252) to UTF8. I wrote below program to do it through java. This program converts the characters to UTF8, but when I opened the file in notepade++ the encoding type was displayed as ANSI as UTF8. This gives me error when I import this file in access db. A file with UTF8 encoding only is desired. Also the requirement is to convert the file without opening it in any editor.

public class ConvertFromAnsiToUtf8 {

public class ConvertFromAnsiToUtf8 {

private static final char BYTE_ORDER_MARK = '\uFEFF';
private static final String ANSI_CODE = "windows-1252";
private static final String UTF_CODE = "UTF8";
private static final Charset ANSI_CHARSET = Charset.forName(ANSI_CODE);

public static void main(String[] args) {

    List<File> fileList;
    File inputFolder = new File(args[0]);
    if (!inputFolder.isDirectory()) {
        return;
    }
    File parentDir = new File(inputFolder.getParent() + "\\"
                    + inputFolder.getName() + "_converted");

    if (parentDir.exists()) {
        return;
    }
    if (parentDir.mkdir()) {

    } else {
        return;
    }

    fileList = new ArrayList<File>();
    for (final File fileEntry : inputFolder.listFiles()) {
        fileList.add(fileEntry);
    }

    InputStream in;

    Reader reader = null;
    Writer writer = null;
    try {
        for (File file : fileList) {
            in = new FileInputStream(file.getAbsoluteFile());
            reader = new InputStreamReader(in, ANSI_CHARSET);

            OutputStream out = new FileOutputStream(
                            parentDir.getAbsoluteFile() + "\\"
                                            + file.getName());
            writer = new OutputStreamWriter(out, UTF_CODE);
            writer.write(BYTE_ORDER_MARK);
            char[] buffer = new char[10];
            int read;
            while ((read = reader.read(buffer)) != -1) {
                System.out.println(read);
                writer.write(buffer, 0, read);
            }
        }
        reader.close();
        writer.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

任何指针都将有所帮助。

Any pointers will be helpful.

谢谢，
Ashish

Thanks, Ashish

推荐答案

正确的从Windows-1252转码为UTF-8。

The posted code correctly transcodes from windows-1252 to UTF-8.

Notepad ++消息令人困惑，因为ANSI as UTF-8没有明显的含义;它似乎是Notepad ++中的打开缺陷。我相信Notepad ++意味着没有BOM的UTF-8 （参见编码菜单。）

The Notepad++ message is confusing because "ANSI as UTF-8" has no obvious meaning; it appears to be an open defect in Notepad++. I believe Notepad++ means UTF-8 without BOM (see the encoding menu.)

作为Windows程序的Microsoft Access可能希望使用UTF- 8个文件以字节顺序标记开始（ BOM ）。

Microsoft Access, being a Windows program, probably expects UTF-8 files to start with a byte-order-mark (BOM).

您可以通过在文件开头写入代码点U + FEFF将文档注入文档：

You can inject a BOM into the document by writing the code point U+FEFF at the start of the file:

import java.io.*;
import java.nio.charset.*;

public class Ansi1252ToUtf8 {
  private static final char BYTE_ORDER_MARK = '\uFEFF';

  public static void main(String[] args) throws IOException {
    Charset windows1252 = Charset.forName("windows-1252");
    try (InputStream in = new FileInputStream(args[0]);
        Reader reader = new InputStreamReader(in, windows1252);
        OutputStream out = new FileOutputStream(args[1]);
        Writer writer = new OutputStreamWriter(out, StandardCharsets.UTF_8)) {
      writer.write(BYTE_ORDER_MARK);
      char[] buffer = new char[1024];
      int read;
      while ((read = reader.read(buffer)) != -1) {
        writer.write(buffer, 0, read);
      }
    }
  }
}

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