Java 读文件的5种方式-优快云博客

本文详细介绍了使用Java进行文件读取的多种方法，包括利用BufferedReader按行读取、FileReader逐字节读取、Scanner读取整行、Files.readAllLines一次性读取所有行以及直接使用File类的基本读取方式。每种方法都附有示例代码，便于理解和实践。

通过bufferedReader 读行

public static void readByBufferedReader() throws IOException {
    FileReader fileReader = new FileReader("/Users/jmeter.log");
    BufferedReader bufferedReader = new BufferedReader(fileReader);
    String st;
    while ((st = bufferedReader.readLine()) != null) {
        System.out.println(st);
    }
}
复制代码

FileReader 读字节

public static void readbyFileReader() throws IOException {
    FileReader fileReader = new FileReader("/Users//jmeter.log");

    int temp;
    while ((temp = fileReader.read()) != -1) {
        System.out.print((char) temp);
    }

}
复制代码

Scanner

public static void readByScanner() throws FileNotFoundException {
    Scanner scanner = new Scanner(new File("/Users//jmeter.log"));
    while (scanner.hasNext()) {
        System.out.println("test");
        System.out.println(scanner.nextLine());
    }
}
复制代码

readAllLines

public static void readByFiles() throws IOException {
    ArrayList list = (ArrayList) Files.readAllLines(Paths.get("/Users//jmeter.log"));
    list.forEach((a) -> System.out.println(a));


}
复制代码