Java文件编码转换

我需要将文件的编码从ANSI（windows-1252）更改为UTF8。 我写下面的程序是通过java来完成的。 此程序将字符转换为UTF8，但是当我在notepade ++中打开文件时，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，这会给我带来错误。 仅需要具有UTF8编码的文件。 此外，还要求在不在任何编辑器中打开文件的情况下转换文件。

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 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(); 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(); } } 

}

任何指针都会有所帮助。

谢谢，Ashish

Answer 1

发布的代码正确地从windows-1252转码为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 ++中的一个开放缺陷 。 我相信Notepad ++意味着没有BOM的UTF-8 （参见编码菜单。）

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

您可以通过在文件开头写入代码点U + FEFF将BOM注入文档：

 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); } } } } 

Answer 2

在运行Java 8的Windows 7（64位）上，我不得不关闭每个文件。 否则，文件将被截断为4 kB的倍数。 关闭最后一组文件是不够的，我必须关闭每个文件才能获得所需的结果。 发布我的改编版本，添加错误消息：

 import java.io.*; import java.nio.charset.*; import java.util.ArrayList; 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); private static final String PATH_SEP = "\\"; private static final boolean WRITE_BOM = false; public static void main(String[] args) { if (args.length != 2) { System.out.println("Please name a source and a target directory"); return; } File inputFolder = new File(args[0]); if (!inputFolder.isDirectory()) { System.out.println("Input folder " + inputFolder + " does not exist"); return; } File outputFolder = new File(args[1]); if (outputFolder.exists()) { System.out.println("Folder " + outputFolder + " exists - aborting"); return; } if (outputFolder.mkdir()) { System.out.println("Placing converted files in " + outputFolder); } else { System.out.println("Output folder " + outputFolder + " exists - aborting"); return; } ArrayList fileList = new ArrayList(); for (final File fileEntry : inputFolder.listFiles()) { fileList.add(fileEntry); } InputStream in; Reader reader = null; Writer writer = null; int converted = 0; try { for (File file : fileList) { try { in = new FileInputStream(file.getAbsoluteFile()); reader = new InputStreamReader(in, ANSI_CHARSET); OutputStream out = new FileOutputStream(outputFolder.getAbsoluteFile() + PATH_SEP + file.getName()); writer = new OutputStreamWriter(out, UTF_CODE); if (WRITE_BOM) writer.write(BYTE_ORDER_MARK); char[] buffer = new char[1024]; int read; while ((read = reader.read(buffer)) != -1) { writer.write(buffer, 0, read); } ++converted; } finally { reader.close(); writer.close(); } } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } System.out.println(converted + " files converted"); } }