Java IO文件编码转换实现代码

public class Transcoding {
 private BytesEncodingDetect encode = new BytesEncodingDetect();
 public Transcoding() {
 }

 /**
  * 编码转换
  * @param toCharset 要转换的编码
  * @param path 要转换的文件路径
  * @return
  * @throws Exception
  */
 public String encoding(String toCharset, String path) throws Exception{
  File srcFile = new File(path);
  int index = encode.detectEncoding(srcFile);
  String charset = BytesEncodingDetect.javaname[index];
  // 编码相同，无需转码
  if (charset.equalsIgnoreCase(toCharset)) {
   return "编码一样，无需转换";
  }

  InputStream in = new FileInputStream(path);

  BufferedReader br = new BufferedReader(
    new InputStreamReader(in, charset));

  StringBuffer sb = new StringBuffer();
  String s1;
  while ((s1=br.readLine())!=null) {
   String s = URLEncoder.encode(s1, toCharset);
   sb.append(s+"\r\n");//一行+回车
  }

  br.close();
  srcFile.delete();//删除原来文件
  //重新以新编码写入文件并返回值
  File newfile = new File(path);//重新建原来的文件
  newfile.createNewFile();
  OutputStream out = new FileOutputStream(newfile);
  OutputStreamWriter  writer = new OutputStreamWriter(out, toCharset);
  BufferedWriter bw = new BufferedWriter(writer);
  bw.write(URLDecoder.decode(sb.toString(), toCharset));
  String result = URLDecoder.decode(sb.toString(), toCharset);
  bw.flush();//刷到文件中
  bw.close();
  return result;
 }

}