Files遍历子文件、遍历目录树方法

1.遍历子文件

package Java10;

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.function.Consumer;
import java.util.stream.Stream;

//遍历子文件
public class Test02 {
    
    public static void main(String[] args) throws IOException {
    
        //Files.list(p8):遍历子文件(path是目录)
        Path p = Paths.get("D:\\java\\test1\\src");
        Stream<Path> s = Files.list(p);
        //匿名内部类
        s.forEach(new Consumer<Path>() {
    
            @Override
            public void accept(Path path) {
    
                System.out.println(path);
            }
        });

        //Files.list(p):遍历子文件(path是目录)
        Path p1 = Paths.get("D:\\java\\test1\\src");
        Stream<Path> s1 = Files.list(p1);
        //lambad表达式
        s1.forEach(path -> System.out.println(path));

        //Files.list(p):遍历子文件(path是目录),根据条件进行遍历
        Path p2 = Paths.get("D:\\java\\test1\\src");
        Stream<Path> s2 = Files.list(p2);
        s2.forEach(path -> {
    
            if (path.toString().endsWith(".java")) {
    
                System.out.println(path);
            }
        });

        //Files.newDirectoryStream(p10):遍历子文件
        Path p4 = Paths.get("D:\\java\\test1\\src");
        DirectoryStream<Path> d1 = Files.newDirectoryStream(p4);
        //lambad表达式
        d1.forEach(path -> System.out.println(path));

        //Files.newDirectoryStream(p10):遍历子文件,根据条件进行遍历子文件
        Path p3 = Paths.get("D:\\java\\test1\\src");
        //匿名内部类
        DirectoryStream<Path> d = Files.newDirectoryStream(p3, new DirectoryStream.Filter<Path>() {
    
            @Override
            public boolean accept(Path path) throws IOException {
    
                return path.toString().endsWith(".java");
            }
        });
        d.forEach(path -> System.out.println(path));

        //Files.newDirectoryStream:遍历子文件,根据条件遍历子文件
        Path p5 = Paths.get("D:\\java\\test1\\src");
        //lambad表达式
        DirectoryStream<Path> d2 = Files.newDirectoryStream(p5, path -> path.toString().endsWith("java"));
        d2.forEach(path -> System.out.println(path));

        //Files.newDirectoryStream:遍历子文件,根据条件遍历子文件
        Path p6 = Paths.get("D:\\java\\test1\\src");
        Files.newDirectoryStream(p6, path -> path.toString().endsWith("java")).forEach(path -> System.out.println(path));
    }
}

2.遍历目录树

package Java10;

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.stream.Stream;

//遍历目录树
public class Test03 {
    
    public static void main(String[] args) throws IOException {
    
        //Files.walk(p):遍历目录树
        Path p = Paths.get("D:\\java\\test1\\src");
        Stream<Path> s = Files.walk(p);
        s.forEach(path -> System.out.println(path));

        //根据条件遍历目录树
        Path p1 = Paths.get("D:\\java\\test1\\src");
        Stream<Path> s1 = Files.walk(p1);
        s1.forEach(path -> {
    
            if (path.toString().endsWith("java")) {
    
                System.out.println(path);
            }
        });

        //Files.find():根据条件查找对应的文件
        Path p2 = Paths.get("D:\\java\\test1\\src");
        //lambad表达式
        Stream<Path> s2 = Files.find(p2, 3, (x, y) -> x.toString().endsWith("java"));
        s2.forEach(path -> System.out.println(path));

        //Files.walkFileTree
        Path p3 = Paths.get("D:\\java\\test1\\src");
        Files.walkFileTree(p3, new FileVisitor<Path>() {
    
            @Override
            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
    
                System.out.println("访问目录前" + dir);
                //CONTINUE:继续,SKIP_SUBTREE:不访问此目录
                if (dir.toString().endsWith("Java1234")) {
    
                    return FileVisitResult.SKIP_SUBTREE;
                }
                return FileVisitResult.CONTINUE;
            }

            @Override
            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
    
                System.out.println("访问文件" + file);
                if (file.toString().endsWith("Test03.java")) {
    
                    //TERMINATE:终止
                    //return FileVisitResult.TERMINATE;
                    //跳过兄弟
                    return FileVisitResult.SKIP_SIBLINGS;
                }
                return FileVisitResult.CONTINUE;
            }

            @Override
            public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
    
                System.out.println("访问文件失败" + file);
                return FileVisitResult.CONTINUE;
            }

            @Override
            public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
    
                System.out.println("访问目录后" + dir);
                return FileVisitResult.CONTINUE;
            }
        });
    }
}