Java读取文件内容

1.Scanner 

 try(Scanner scanner = new Scanner(new FileReader(fileName))) {
            while (scanner.hasNextLine()) {
                String line = scanner.nextLine();
                System.out.println(line);
            }
       } catch (Exception e) {
            System.out.println(e.getMessage());
 }

2.Files.lines

Stream<String> lines = Files.lines(Paths.get(fileName));
// 随机行顺序进行数据处理
lines.forEach(ele -> {
   System.out.println(ele);
});
// 顺序读取数据
lines.forEachOrdered(System.out::println);

3.经典管道流的方式

try (BufferedReader br = Files.newBufferedReader(Paths.get(fileName))){
      String line;
      while ((line = br.readLine()) != null) {
         System.out.println(line);
      }
}