JAVA 从文本文件返回字符串内容

    private static String ReadTxtFile(String FileName) throws Exception {
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(FileName));
        ByteArrayOutputStream memStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = bufferedInputStream.read(buffer)) != -1){
            memStream.write(buffer, 0, len);
        }
        byte[] data = memStream.toByteArray();        
        bufferedInputStream.close();
        memStream.close();
        bufferedInputStream.close();
        return new String(data);
    }