file.getPath()的相对路径

时间:2018-09-16 12:55:32

标签: java eclipse javafx file-handling

在此程序中,我试图选择一个文件并读取此文件项目的相对路径

        FileChooser photo = new FileChooser();
        Stage stage = new Stage();stage.setTitle("File Chooser Sample");
        openButton.setOnAction((final ActionEvent t) -> {
            File file = photo.showOpenDialog(stage);
            if (file != null) {
                System.out.println(file.getPath());;
            }
        });

我的项目路径是 C:\ Users \ 151 \ eclipse-workspace \ FlexiRentGui \

我正在Eclipse IDE中运行程序

当我选择 C:\ Users \ 151 \ eclipse-workspace \ FlexiRentGui \ res \ 1.jpg

代替打印相对路径“ /res/1.jpg”

它仍然打印绝对路径 C:\ Users \ 151 \ eclipse-workspace \ FlexiRentGui \ res \ 1.jpg

2 个答案:

答案 0 :(得分:1)

您需要获取当前目录/项目的根目录的URI,然后使用java.net.URI.relativize()方法来查找所选文件的相对路径而不是项目的根目录。像这样的东西:new File(cwd).toURI().relativize(file.toURI()).getPath()

这是伪代码:

package org.test;

import java.io.File;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

public class FileChooserDemo extends Application {

    public FileChooserDemo() {};

    public static void main(String[] args) throws ClassNotFoundException {
        FileChooserDemo.launch(FileChooserDemo.class); 
    }

    public void chooseFileAndPrintRelativePath() {
        FileChooser photo = new FileChooser();
        Stage stage = new Stage();
        stage.setTitle("File Chooser Sample");
        Button openButton = new Button("Choose file");
        openButton.setOnAction((t) -> {
            File file = photo.showOpenDialog(stage);
            if (file != null) {
                String cwd = System. getProperty("user.dir");
                System.out.println(new File(cwd).toURI().relativize(file.toURI()).getPath());
            }
        });
        //Creating a Grid Pane 
        GridPane gridPane = new GridPane();    
        //Setting size for the pane 
        gridPane.setMinSize(400, 200);
        gridPane.add(openButton, 0, 0); 
        Scene scene = new Scene(gridPane);
        stage.setScene(scene);
        stage.show();
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        chooseFileAndPrintRelativePath();
    }

}

答案 1 :(得分:0)

您可以避免使用旧的java.io包,而应使用java.nio。您的代码看起来会更好一些,也会更短(也使用新的库)。

为此,只需获取当前的工作目录:

var pwd = Paths.get("").toAbsolutePath();
var relative = pwd.relativize(Paths.get("someOtherPath"));

我希望这会有所帮助。