需要帮助显示来自url或filechooser的图像
需要帮助显示来自url或filechooser的图像
提问于 2016-09-28 07:08:42
我在使用url或filechooser显示图像时遇到了问题。我已经实现了从url或pc中提取文件的方法，只是不确定如何显示这些图像。
这里我调用从url提取的方法：
@FXML
private void button0Action (ActionEvent event) throws IOException {
catdog c = new catdog();
String cat = c.cat();
System.out.println(cat);输出对话框返回url：500.gif
这是我的展示课：
package screensaver;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
public class Display extends Application {
@Override // Override the start method in the Application class
public void start(Stage primaryStage) {
GridPane pane = new GridPane();
pane.setAlignment(Pos.CENTER);
pane.setHgap(0);
pane.setVgap(0);
Scene scene = new Scene(pane);
primaryStage.setTitle("imageViewer");
primaryStage.setScene(scene);
primaryStage.show();
}
}创建了显示和ImageView的新实例：
@FXML
private void button0Action (ActionEvent event) throws IOException {
catdog c = new catdog();
String cat = c.cat();
System.out.println(cat);
Display catDisplay = new Display();
ImageView catImage = new ImageView(cat);
}然后如何将图像添加到窗格并调用start方法来显示场景？我知道我可以在Display类中创建一个ImageView实例，然后将一个图像添加到窗格中，尽管我无法从button0Action方法中提取包含url的变量cat。现在卡住了，不知道从这里往哪里走。在过去的几天里一直在努力尝试不同的方法却没有运气。有什么想法吗？
到目前为止，我的变化如下：
展示级：
package screensaver;
import java.io.IOException;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
public class Display {
public void showImage0 (String url) throws IOException {
Stage stage = new Stage();
GridPane pane = new GridPane();
pane.setAlignment(Pos.CENTER);
pane.setHgap(0);
pane.setVgap(0);
Catdog c = new Catdog();
pane.getChildren().add(new ImageView(c.cat()));
Scene scene = new Scene(pane);
stage.setTitle("imageViewer");
stage.setScene(scene);
stage.show();
}
public void showImage1 (String url) throws IOException {
Stage stage = new Stage();
GridPane pane = new GridPane();
pane.setAlignment(Pos.CENTER);
pane.setHgap(0);
pane.setVgap(0);
Catdog d = new Catdog();
pane.getChildren().add(new ImageView(d.dog()));
Scene scene = new Scene(pane);
stage.setTitle("imageViewer");
stage.setScene(scene);
stage.show();
}
public void showImage2 (String url) throws IOException {
Stage stage = new Stage();
GridPane pane = new GridPane();
pane.setAlignment(Pos.CENTER);
pane.setHgap(0);
pane.setVgap(0);
LandscapeImage lI = new LandscapeImage();
pane.getChildren().add(new ImageView(lI.imageSource));
Scene scene = new Scene(pane);
stage.setTitle("imageViewer");
stage.setScene(scene);
stage.show();
}
public void showImage3 (String file) throws IOException {
Stage stage = new Stage();
GridPane pane = new GridPane();
pane.setAlignment(Pos.CENTER);
pane.setHgap(0);
pane.setVgap(0);
FileChooser fc3 = new FileChooser();
pane.getChildren().add(new ImageView(fc3.fileChoice()));
Scene scene = new Scene(pane);
stage.setTitle("imageViewer");
stage.setScene(scene);
stage.show();
}
}错误发生在这里:此处不允许使用“void”类型。
pane.getChildren().add(new ImageView(fc3.fileChoice()));下面是FileChooser类：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package screensaver;
import java.io.File;
import java.io.IOException;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonType;
/**
*
* @author Jacob
*/
public class FileChooser {
void fileChoice () throws IOException{
javafx.stage.FileChooser fc3 = new javafx.stage.FileChooser();
File selectedFile = fc3.showOpenDialog(null);
fc3.getExtensionFilters().addAll(
new javafx.stage.FileChooser.ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"));
if (selectedFile != null) {
String location = (selectedFile.getAbsoluteFile().toURI().toString());
System.out.println(location);
Display ownDisplay = new Display();
ownDisplay.showImage3(location);
} else {
Alert alert = new Alert(Alert.AlertType.CONFIRMATION,"No file was selected");
alert.showAndWait()
.filter(response -> response == ButtonType.OK)
.ifPresent((ButtonType response) -> {
System.out.println("OK");
});
}
}
}最新代码：
显示方法：
public void showImage3 (String file) throws IOException, Exception {
Stage stage = new Stage();
GridPane pane = new GridPane();
pane.setAlignment(Pos.CENTER);
pane.setHgap(0);
pane.setVgap(0);
pane.getChildren().add(new ImageView(file));
Scene scene = new Scene(pane);
stage.setTitle("imageViewer");
stage.setScene(scene);
stage.show();
}button3Action方法：
@FXML
private void button3Action(ActionEvent event) throws IOException, Exception {
FileChooser fc3 = new FileChooser();
File selectedFile = fc3.showOpenDialog(null);
fc3.getExtensionFilters().addAll(
new ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"));
if (selectedFile != null) {
String location = (selectedFile.getAbsoluteFile().toURI().toString());
System.out.println(location);
Display fileChoice = new Display();
fileChoice.showImage3(location);
} else {
Alert alert = new Alert(AlertType.CONFIRMATION,"No file was selected");
alert.showAndWait()
.filter(response -> response == ButtonType.OK)
.ifPresent((ButtonType response) -> {
System.out.println("OK");
});
}
}回答 1
Stack Overflow用户
发布于 2016-09-28 10:45:30
编辑2:
因为我不能再跟随你了，试着理解这个例子(它是完全有效的)。
这将有助于解决问题：
public class TestClass extends javafx.application.Application
{
@Override
public void start(javafx.stage.Stage primaryStage)
{
javafx.scene.control.Button button = new javafx.scene.control.Button("click me");
button.setOnAction((javafx.event.ActionEvent event) -> { chooseImageAndDisplay(); });
javafx.scene.layout.BorderPane pane = new javafx.scene.layout.BorderPane();
pane.setCenter(button);
pane.setPrefSize(300, 200);
javafx.scene.Scene scene = new javafx.scene.Scene(pane);
primaryStage.setTitle("imageViewer");
primaryStage.setScene(scene);
primaryStage.show();
}
private void chooseImageAndDisplay()
{
javafx.stage.FileChooser fc = new javafx.stage.FileChooser();
fc.getExtensionFilters().addAll(new javafx.stage.FileChooser.ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"));
java.io.File selectedFile = fc.showOpenDialog(null);
if (selectedFile != null)
{
String location = (selectedFile.getAbsoluteFile().toURI().toString());
javafx.scene.layout.BorderPane pane = new javafx.scene.layout.BorderPane();
pane.setPrefSize(300, 200);
javafx.scene.image.ImageView iw = new javafx.scene.image.ImageView(location);
pane.setCenter(iw);
javafx.scene.Scene scene = new javafx.scene.Scene(pane);
javafx.stage.Stage stage = new javafx.stage.Stage();
stage.setTitle("imageViewer");
stage.setScene(scene);
stage.show();
}
}
public static void main(String[] args)
{
launch(args);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/39740355
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