java - 逐行读取文件并打印该行(如果该行包含枚举中的任何值)

Question

So far I did is 

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
public class project2 {
  public static void main( String[] args ) throws IOException {
      File file =new File("D:/log/logging.log");
      Scanner in = null;
      try {
          in = new Scanner(file);
          while(in.hasNext())
          {
              String line=in.nextLine();
                  if(line.contains(""))
                      System.out.println(line);
          }
      } catch (FileNotFoundException e) {
          e.printStackTrace();
      }
    }

 } 
 public class Example(
    public enum Searchword {
        info,debug
    }}

我需要搜索该行是否包含任何一个枚举值，然后需要打印该行。是否可以搜索以及如何搜索。

Answer 1

使用 java.nio 和 Java 8 Streams - 有一种声明式方法

import java.nio.file.*;
import java.util.stream.Stream;

public class Main {

    enum Search { info, debug }

    public static void main(String[] args) throws Exception {
        Path path = Paths.get("pathToFile");

        Files.lines(path)
             .filter(Main::containsSearchTerm)
             .forEach(System.out::println);
    }

    public static boolean containsSearchTerm(String input) {
        return Stream.of(Search.values())
                     .map(Search::name)
                     .anyMatch(input::contains);
    }
}