关于java：file.getPath（）的相对路径

relative path for file.getPath()

本问题已经有最佳答案，请猛点这里访问。

在这个程序中，我试图选择一个文件并读取这个文件的项目的相对路径。

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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:users151eclipse工作区flexierntgui

我在Eclipse IDE中运行这个程序

当我选择C:users151eclipse workspaceflexierntgui
es1.jpg

而不是打印相对路径"/res/1.jpg"

它仍然打印出绝对路径C:users151eclipse workspaceflexierntgui
es1.jpg

您需要获取当前目录/项目根目录的URI，然后使用java.net.URI.relativize()方法查找所选文件的相对路径w.r.t您的项目根目录。像这样：new File(cwd).toURI().relativize(file.toURI()).getPath()。

以下是PSEDO代码：

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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();
}

}