记录学习--文件读写

1、读文件

	public static String file2String(final String fileName) throws IOException {
        File file = new File(fileName);
        return file2String(file);
    }

    public static String file2String(final File file) throws IOException {
        if (file.exists()) {
            byte[] data = new byte[(int) file.length()];
            boolean result;

            try (FileInputStream inputStream = new FileInputStream(file)) {
                int len = inputStream.read(data);
                result = len == data.length;
            }

            if (result) {
                return new String(data, DEFAULT_CHARSET);
            }
        }
        return null;
    }

2、写文件

    public static void string2FileNotSafe(final String str, final String fileName) throws IOException {
        File file = new File(fileName);
        File fileParent = file.getParentFile();
        if (fileParent != null) {
            fileParent.mkdirs();
        }
        IOTinyUtils.writeStringToFile(file, str, DEFAULT_CHARSET);
    }

    public static void writeStringToFile(File file, String data, String encoding) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream(file);
            os.write(data.getBytes(encoding));
        } finally {
            if (null != os) {
                os.close();
            }
        }
    }