java(IO)读写文件乱码转换UTF-8问题

     读取文件

public static String readHtml(String fileName){
        FileInputStream fis = null;
        StringBuffer sb = new StringBuffer();
        try {
            fis = new FileInputStream(fileName);
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            String line = null;
            while ((line = br.readLine()) != null) {
                sb.append(line);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (IOException e1) {
                e1.printStackTrace();
            }
        }
        return sb.toString();
    }



      写入文件

   public static void outFile(String sb) {
        try {
            File file = new File("G:\liuhecai.txt");
            if (file.exists()) {
                file.delete();
            }
            file.createNewFile();
            FileOutputStream fos = new FileOutputStream(file);
            OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");
            osw.write(sb);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }