java - 使用java搜索并打印文本文件

Question

如何从 .t​​xt 文件中搜索文本并打印特定的文本行？例如我有一个名为 Airlines.txt 的 txt 文件，我搜索 MMHHHAAAA。然后，我想从“MMHHHAAAA:Malaysian Airlines”行中提取“Malaysian Airlines”

//Scan file airlines.txt
Scanner scanner = new Scanner(new File("airlines.txt"));
while(scanner.hasNextLine()){
//Will this work?
  String s = scan.nextLine();
  Scanner line = new Scanner(s);
  String airline;
//How do i continue from here to scan for MMHHHAAAA and then print out the following line of text
}
System.out.println("Airline is" + airline);
return airline;
}

Answer 1

您可以在 Java 8 中使用它:

final Path path = Paths.get("airlines.txt");

final Optional<String> theLine;

try (
    final Stream<String> lines = Files.lines(path, StandardCharsets.UTF_8)
) {
    theLine = lines.filter(s -> s.startsWith("MMHHHAAAA:"))
        .findFirst();
}

if (theLine.isPresent())
    // do something with theLine.get()