Java8常用文件处理方法

获取并解析文件

public void parse() {

        InputStream resource = Test.class.getResourceAsStream("/a.txt");

        try {
            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(resource));
            // 获取文件
            String line;

            while ((line = bufferedReader.readLine()) != null) {
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

获取其及子孙目录下的所有文件和目录

public static List<Path> getFileList() {
    try {
        return Files.walk(Paths.get(dir))
                .filter(Files::isRegularFile)
                .filter(e -> e.toString().contains("app"))
                .collect(Collectors.toList());
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

写入文件

public static void write(StringBuilder stringBuilder) {
    BufferedWriter bfw = null;
    try {
        bfw = Files.newBufferedWriter(Paths.get(dir + "/a.txt"));
        bfw.write(stringBuilder.toString());
        bfw.flush();
        bfw.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

}