java8 Stream流逐行处理文本文件

Path filePath = Paths.get("c:/temp", "data.txt");
 
//try-with-resources语法,不用手动的编码关闭流
try (Stream<String> lines = Files.lines( filePath )) 
{
  lines.forEach(System.out::println);
} 
catch (IOException e) 
{
  e.printStackTrace();//只是测试用例，生产环境下不要这样做异常处理
}

Path filePath = Paths.get("c:/temp", "data.txt");
 
try (Stream<String> lines = Files.lines(filePath)){
 
   List<String> filteredLines = lines
          .filter(s -> s.contains("password"))
          .collect(Collectors.toList());
   
   filteredLines.forEach(System.out::println);
 
} catch (IOException e) {
  e.printStackTrace();//只是测试用例，生产环境下不要这样做异常处理
}

private static void readLinesUsingFileReader() throws IOException 
{
  File file = new File("c:/temp/data.txt");
 
  FileReader fr = new FileReader(file);
  BufferedReader br = new BufferedReader(fr);
 
  String line;
  while((line = br.readLine()) != null)
  {
    if(line.contains("password")){
      System.out.println(line);
    }
  }
  br.close();
  fr.close();
}