Files遍历目录树

遍历目录树，lambad表达式

package Java10.FilesWalk;

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

public class FilesWalk1 {
    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);
        //lambad表达式
        s.forEach(path -> System.out.println(path));
    }
}

根据条件遍历，lambad表达式

package Java10.FilesWalk;

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

public class FilesWalk2 {
    public static void main(String[] args) throws IOException {
        //Files.walk(p):遍历目录树,根据条件遍历目录树
        Path p1 = Paths.get("D:\\java\\test1\\src");
        Stream<Path> s1 = Files.walk(p1);
        //lambad表达式
        s1.forEach(path -> {
            if (path.toString().endsWith("java")) {
                System.out.println(path);
            }
        });
    }
}

根据条件查找对应的文件，lambad表达式

package Java10.FilesWalk;

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

public class FilesWalk3 {
    public static void main(String[] args) throws IOException {
        //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, 1, (x, y) -> x.toString().endsWith("java"));
        s2.forEach(path -> System.out.println(path));
    }
}

Files.walkFileTree

package Java10.FilesWalk;

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;

public class FilesWalk4 {
    public static void main(String[] args) throws IOException {
        //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;
            }
        });
    }
}