Java 简单读取文件

/**
         * read rd.txt form path :/debian/var/www/pc2/database/rd.txt
         *
         * @return
         */
        public String readRd() {
                String res = null;
                try {
                        FileInputStream fin = new FileInputStream("/debian/var/www/pc2/database/rd.txt");
                        int length = fin.available();
                        byte[] buffer = new byte[length];
                        fin.read(buffer);
                        res = EncodingUtils.getString(buffer, "UTF-8");
                        fin.close();
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return res;
        }