BOM标记UTF8文件的例子

Java 的 OutputStreamWriter 不会写入 utf8 bom 标记的.

下面给一个写入UTF8 BOM标记的例子：

  public static void saveFile(String file, String data, boolean append) throws IOException {
     BufferedWriter bw = null;
     OutputStreamWriter osw = null;
  
     File f = new File(file);
     FileOutputStream fos = new FileOutputStream(f, append);
     try {
        // write UTF8 BOM mark if file is empty
        if (f.length() < 1) {
           final byte[] bom = new byte[] { (byte)0xEF, (byte)0xBB, (byte)0xBF };
           fos.write(bom);
        }

        osw = new OutputStreamWriter(fos, "UTF-8");
        bw = new BufferedWriter(osw);
        if (data != null) bw.write(data);
     } catch (IOException ex) {
        throw ex;
     } finally {
        try { bw.close(); fos.close(); } catch (Exception ex) { }
     }
  }