SimpleFileVisitor example

java.nio.file.SimpleFileVisitor is a simple visitor of files with default behavior to visit all files and to re-throw I/O errors.

Simple example using SimpleFileVisitor.

package java_simplefilevisitor;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class Java_SimpleFileVisitor {
    
    public static class MySimpleFileVisitor extends SimpleFileVisitor<Path> {

        @Override
        public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) 
                throws IOException {
            System.out.format("preVisitDirectory: %s\n", dir);
            return super.preVisitDirectory(dir, attrs);
        }

        @Override
        public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) 
                throws IOException {
            System.out.format("visitFile: %s\n", file);
            return super.visitFile(file, attrs);
        }

        @Override
        public FileVisitResult visitFileFailed(Path file, IOException exc) 
                throws IOException {
            System.out.format("visitFileFailed: %s\n", file);
            return super.visitFileFailed(file, exc);
        }

        @Override
        public FileVisitResult postVisitDirectory(Path dir, IOException exc) 
                throws IOException {
            System.out.format("postVisitDirectory: %s\n", dir);
            return super.postVisitDirectory(dir, exc);
        }
        
    }

    public static void main(String[] args) {
        Path path = Paths.get("/home/eric/NetBeansProjects/Java_SimpleFileVisitor");
        MySimpleFileVisitor mySimpleFileVisitor = new MySimpleFileVisitor();
        
        try {
            Files.walkFileTree(path, mySimpleFileVisitor);
        } catch (IOException ex) {
            Logger.getLogger(Java_SimpleFileVisitor.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

SimpleFileVisitor example

Reference:
- Class SimpleFileVisitor
- Walking the File Tree

AbsolutePath, RealPath and Uri

AbsolutePath, RealPath and Uri

package javafx_niofile;

import java.io.File;
import java.io.IOException;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_NIOFile extends Application {
    
    Label label;
    
    @Override
    public void start(Stage primaryStage) {
        Button btnLoad = new Button();
        btnLoad.setText("Load File");
        btnLoad.setOnAction(btnLoadEventListener);
        
        label = new Label();
        
        VBox rootBox = new VBox();
        rootBox.getChildren().addAll(btnLoad, label);
        
        Scene scene = new Scene(rootBox, 400, 350);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    EventHandler<ActionEvent> btnLoadEventListener
    = new EventHandler<ActionEvent>(){
  
        @Override
        public void handle(ActionEvent t) {
            FileChooser fileChooser = new FileChooser();
              
            //Set extension filter
            FileChooser.ExtensionFilter extFilter 
                    = new FileChooser.ExtensionFilter("ALL files (*.*)", "*.*");
            fileChooser.getExtensionFilters().add(extFilter);
               
            //Show open file dialog, return a java.io.File object
            File file = fileChooser.showOpenDialog(null);
            
            //obtain a java.nio.file.Path object 
            Path path = file.toPath();
            
            String fileInfo;
            fileInfo = "path = " + path + "\n";
            try {
                fileInfo +=
                 "AbsolutePath = " + path.toAbsolutePath() + "\n" +
                 "RealPath = " + path.toRealPath(LinkOption.NOFOLLOW_LINKS) + "\n" +
                 "Uri = " + path.toUri() + "\n";
            } catch (IOException ex) {
                Logger.getLogger(JavaFX_NIOFile.class.getName()).log(Level.SEVERE, null, ex);
            }

            label.setText(fileInfo);
        }
    };
}

Resolve path

This example demonstrate how to use the method Path java.nio.file.Path.resolve(Path other) to resolve the given path against this path.

package javafx_niofile;

import java.io.File;
import java.nio.file.Path;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_NIOFile extends Application {
    
    Label label;
    
    @Override
    public void start(Stage primaryStage) {
        Button btnLoad = new Button();
        btnLoad.setText("Load File");
        btnLoad.setOnAction(btnLoadEventListener);
        
        label = new Label();
        
        VBox rootBox = new VBox();
        rootBox.getChildren().addAll(btnLoad, label);
        
        Scene scene = new Scene(rootBox, 400, 350);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    EventHandler<ActionEvent> btnLoadEventListener
    = new EventHandler<ActionEvent>(){
  
        @Override
        public void handle(ActionEvent t) {
            FileChooser fileChooser = new FileChooser();
              
            //Set extension filter
            FileChooser.ExtensionFilter extFilter 
                    = new FileChooser.ExtensionFilter("ALL files (*.*)", "*.*");
            fileChooser.getExtensionFilters().add(extFilter);
               
            //Show open file dialog, return a java.io.File object
            File file = fileChooser.showOpenDialog(null);
            
            //obtain a java.nio.file.Path object 
            Path path = file.toPath();
            
            Path parentPath = path.getParent();
            Path partialPath = path.getFileName();
            Path resolvedPath = parentPath.resolve(partialPath);
            
            String fileInfo = "parent = " + parentPath + "\n" +
                    "partial path = " + partialPath + "\n" +
                    "resolve Path = " + resolvedPath;

            label.setText(fileInfo);
        }
    };
}

Resolve path

Access subpath of java.nio.file.Path

Access subpath of java.nio.file.Path

package javafx_niofile;

import java.io.File;
import java.nio.file.Path;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_NIOFile extends Application {
    
    Label label;
    
    @Override
    public void start(Stage primaryStage) {
        Button btnLoad = new Button();
        btnLoad.setText("Load File");
        btnLoad.setOnAction(btnLoadEventListener);
        
        label = new Label();
        
        VBox rootBox = new VBox();
        rootBox.getChildren().addAll(btnLoad, label);
        
        Scene scene = new Scene(rootBox, 400, 350);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    EventHandler<ActionEvent> btnLoadEventListener
    = new EventHandler<ActionEvent>(){
  
        @Override
        public void handle(ActionEvent t) {
            FileChooser fileChooser = new FileChooser();
              
            //Set extension filter
            FileChooser.ExtensionFilter extFilter 
                    = new FileChooser.ExtensionFilter("ALL files (*.*)", "*.*");
            fileChooser.getExtensionFilters().add(extFilter);
               
            //Show open file dialog, return a java.io.File object
            File file = fileChooser.showOpenDialog(null);
            
            //obtain a java.nio.file.Path object 
            Path path = file.toPath();

            String fileInfo = "path = " + path + "\n";
            fileInfo += "path.toString() = " + path.toString() + "\n";
            fileInfo += "URI: " + path.toUri() + "\n\n";

            fileInfo += "subPath: \n";
            for (Path subPath : path) {
                fileInfo += subPath + "\n";
            }

            label.setText(fileInfo);
        }
    };
}

Related:
- Get file info using java.nio.file.Path and java.nio.file.Files

Get file info using java.nio.file.Path and java.nio.file.Files

The previous post describe how to "Get file info using java.io.File", this one have similar function using java.nio.file.Path and java.nio.file.Files.

Please note that JavaFX FileChooser return a java.io.File object. To obtain coresponding java.nio.file.Path object, call its toPath() method.

package javafx_niofile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_NIOFile extends Application {
    
    Label label;
    
    @Override
    public void start(Stage primaryStage) {
        Button btnLoad = new Button();
        btnLoad.setText("Load File");
        btnLoad.setOnAction(btnLoadEventListener);
        
        label = new Label();
        
        VBox rootBox = new VBox();
        rootBox.getChildren().addAll(btnLoad, label);
        
        Scene scene = new Scene(rootBox, 400, 350);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    EventHandler<ActionEvent> btnLoadEventListener
    = new EventHandler<ActionEvent>(){
  
        @Override
        public void handle(ActionEvent t) {
            FileChooser fileChooser = new FileChooser();
              
            //Set extension filter
            FileChooser.ExtensionFilter extFilter 
                    = new FileChooser.ExtensionFilter("ALL files (*.*)", "*.*");
            fileChooser.getExtensionFilters().add(extFilter);
               
            //Show open file dialog, return a java.io.File object
            File file = fileChooser.showOpenDialog(null);
            
            //obtain a java.nio.file.Path object 
            Path path = file.toPath();
            
            String fileInfo = "Path = " + path.toString() + "\n\n";
            
            fileInfo += "FileSystem: " + path.getFileSystem() + "\n\n";
            
            fileInfo += "FileName = " + path.getFileName() + "\n"
                    + "Parent = " + path.getParent() + "\n\n"
                    + "isExecutable(): " + Files.isExecutable(path) + "\n"
                    + "isReadable(): " + Files.isReadable(path) + "\n"
                    + "isWritable(): " + Files.isWritable(path) + "\n";
            try {
                fileInfo += "getLastModifiedTime(): " + Files.getLastModifiedTime(path, LinkOption.NOFOLLOW_LINKS) + "\n"
                        + "size(): " + Files.size(path) + "\n";
            } catch (IOException ex) {
                Logger.getLogger(JavaFX_NIOFile.class.getName()).log(Level.SEVERE, null, ex);
            }

            label.setText(fileInfo);

        }
    };
    
}

Get file info using java.nio.file.Path and java.nio.file.Files

Related:
- Access subpath of java.nio.file.Path