@Test
void testReadFile2() throws IOException {
   String fileName = "D:\\test\\netkiller\\neo.txt";

   // 读取文件内容到Stream流中，按行读取
   Stream<String> lines = Files.lines(Paths.get(fileName));

   // 随机行顺序进行数据处理
   lines.forEach(line -> {
      System.out.println(line);
   });
}		
			
			

			
// 按文件行顺序进行处理
lines.forEachOrdered(System.out::println);

// 利用CPU多和的能力，进行数据的并行处理parallel()，适合比较大的文件。
lines.parallel().forEachOrdered(System.out::println);			
			
			

			
@Test
void testReadFile3() throws IOException {
   String fileName = "D:\\test\\netkiller\\neo.txt";

   // 转换成List<String>, 要注意java.lang.OutOfMemoryError: Java heap space
   List<String> lines = Files.readAllLines(Paths.get(fileName),
               StandardCharsets.UTF_8);
   lines.forEach(System.out::println);

}			
			
			

			
@Test
void testReadFile5() throws IOException {
   String fileName = "D:\\test\\netkiller\\neo.txt";

   //如果是JDK11用上面的方法，如果不是用这个方法也很容易
   byte[] bytes = Files.readAllBytes(Paths.get(fileName));

   String content = new String(bytes, StandardCharsets.UTF_8);
   System.out.println(content);
}			
			
			

			
@Test
void testReadFile6() throws IOException {
   String fileName = "D:\\test\\netkiller\\neo.txt";

   // 带缓冲的流读取，默认缓冲区8k
   try (BufferedReader br = new BufferedReader(new FileReader(fileName))){
      String line;
      while ((line = br.readLine()) != null) {
         System.out.println(line);
      }
   }

   //java 8中这样写也可以
   try (BufferedReader br = Files.newBufferedReader(Paths.get(fileName))){
      String line;
      while ((line = br.readLine()) != null) {
         System.out.println(line);
      }
   }

}