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Java IO & NIO - Files.find() Examples

Java IO & NIO Java Java API 

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Class:

java.nio.file.Files

java.lang.Objectjava.lang.Objectjava.nio.file.Filesjava.nio.file.FilesLogicBig

Method:

public static Stream<Path> find(Path start,
                                int maxDepth,
                                BiPredicate<Path,BasicFileAttributes> matcher,
                                FileVisitOption... options)
                         throws IOException

This method searches for files in a file tree rooted at a given starting file path.

Parameters:
start - the starting file
maxDepth - the maximum number of directory levels to search
matcher - the function used to decide whether a file should be included in the returned stream
options - options to configure the traversal
Returns:
An instance of java.util.stream.Stream having matched paths (java.nio.file.Path).

Examples


c:\test

c:\test>tree c:\test /F /A
Folder PATH listing for volume OS_Install
Volume serial number is 7844-2D90
C:\TEST
\---f1
    +---f2
    |       f2.txt
    |       items.txt
    |       
    \---f3
        |   random-items.txt
        |   
        \---f5
                old-file.txt
                

package com.logicbig.example.files;

import java.io.File;
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 FindExample {

    public static void main(String... args) throws IOException {
        Path testPath = Paths.get("c:\\test");
        //finding files containing 'items' in name
        Stream<Path> stream =
                Files.find(testPath, 100,
                        (path, basicFileAttributes) -> {
                            File file = path.toFile();
                            return !file.isDirectory() &&
                                    file.getName().contains("items");
                        });
        stream.forEach(System.out::println);
    }
}

Output

c:\test\f1\f2\items.txt
c:\test\f1\f3\random-items.txt




c:\test

c:\test>tree c:\test /F /A
Folder PATH listing for volume OS_Install
Volume serial number is 000000E6 7844:2D90
C:\TEST
\---f1
    +---f2
    |       f2.txt
    |       items.txt
    |       
    \---f3
        |   random-items.txt
        |   
        \---f5
                old-file.txt
                

package com.logicbig.example.files;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.stream.Stream;

public class FindExample2 {

    public static void main(String... args) throws IOException {
        Path testPath = Paths.get("c:\\test");
        LocalDateTime target = LocalDate.of(2016, 1, 1).atStartOfDay();
        //finding files which were created before target date
        Stream<Path> stream = Files.find(testPath, 100,
                (path, basicFileAttributes) -> {
                    try {
                        LocalDateTime created = getCreationDateTime(basicFileAttributes);
                        return created.isBefore(target);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    return false;
                });

        stream.forEach((p) -> {
            System.out.println(p);
            try {
                BasicFileAttributes attr = Files.readAttributes(p,
                        BasicFileAttributes.class);
                System.out.println("date created :" + getCreationDateTime(attr));
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
    }

    public static LocalDateTime getCreationDateTime(BasicFileAttributes attr)
            throws IOException {

        return attr.creationTime()
                   .toInstant()
                   .atZone(ZoneId.systemDefault())
                   .toLocalDateTime();
    }
}

Output

c:\test\f1\f3\f5\old-file.txt
date created :2015-12-14T14:29

See Also