import org.apache.commons.lang.ArrayUtils;

public class EncodeRepairTool {
 public static final byte[] bPre = "EFBBBF".getBytes();
 private int i = 0;

 /**
  * @param args
  */
 public static void main(String[] args) {  
  String path = "D:\\eclipse-dev-3.3\\workspace";
  File file = new File(path);
  EncodeRepairTool scanner = new EncodeRepairTool();
  scanner.scanFolder(file);

 }

 public void scanFolder(File file) {
  if (file.isDirectory()) {
   File[] files = file.listFiles();
   for (int i = 0; i < files.length; i++) {
    scanFolder(files[i]);
   }
  } else if (file.getName().endsWith(".java")) {
   removePreCode(file);
  }
 }

 private void removePreCode(File file) {
  try {
   FileInputStream fis = new FileInputStream(file);
   int size = fis.available();
   if (size < 24) {
    return;
   }
   i ++ ;
   byte[] bs = new byte[size];
   fis.read(bs);
   byte[] tbs = ArrayUtils.subarray(bs, 0, 3);
   byte[] tbs1 = new byte[] { new Integer(0xEF).byteValue(),
     new Integer(0xBB).byteValue(),
     new Integer(0xBF).byteValue() };
   boolean bol = false;
   if (tbs[0] == tbs1[0] && tbs[1] == tbs1[1] && tbs[2] == tbs1[2]) {
    bol = true;
   }
   fis.close();
   if (!bol) {
    System.out.println("  " + i + " : " + file.getName());
    tbs = bs;
   }
   else {
    System.out.println("**" + i + " : " + file.getName());
    tbs = ArrayUtils.subarray(bs, 3, size);
    
   }   
   InputStreamReader reader = new InputStreamReader(new ByteArrayInputStream(tbs), "UTF-8");
   BufferedReader br = new BufferedReader(reader);
   StringBuffer buffer = new StringBuffer();
   String s = br.readLine();
   while (s != null) {
    buffer.append(s);
    buffer.append("\n");
    s =  br.readLine();
   }
   reader.close();
   byte[] nbs = buffer.toString().getBytes("GBK");   
   FileOutputStream fos = new FileOutputStream(file);
   fos.write(nbs);
   fos.flush();
   fos.close();
   
  } catch (FileNotFoundException e) {
   // TODO 自动生成 catch 块
   e.printStackTrace();
  } catch (IOException e) {
   // TODO 自动生成 catch 块
   e.printStackTrace();
  }

 }

}