应用程序启动方法中的JavaFx异常和应用程序启动方法中的异常
JavaFx Exception in Application start method and Exception in Application start method
我创建了这个 javaFx class 来以不同的角度洗牌和展示扑克牌。但是突然我得到了一个错误。我试图修复它，但我仍然无法让它工作。下面的代码给出了代码解释。
该程序假设选择随机的 png 卡片图像并显示在第一行。第二行以不同的角度展示了三张小丑牌。第三行以三个不同的角度展示了另外三张不同的卡片
代码：
import java.util.ArrayList;
import java.util.Random;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
//Creating class JavaFXCardGUI which is extending Application class
//Now JavaFXCardGUI class will act as an JavaFX Application
public class JavaFXCards extends Application{
//Overriding start method of Application class which is always a starting point of any JavaFX Application
@Override
public void start(Stage stage) throws Exception {
//Creating a VBox object
VBox vBox=new VBox();
//Setting its spacing and padding
vBox.setSpacing(50);
vBox.setPadding(new Insets(20, 40, 40, 60));
//Creating a HBox object which will store the first row cards and setting its spacing property
HBox firstRowHBox=new HBox();
firstRowHBox.setSpacing(50);
//Creating a HBox object which will store the second row cards and setting its spacing property
HBox secondRowHBox=new HBox();
secondRowHBox.setSpacing(50);
//Creating a HBox object which will store the third row cards and setting its spacing property
HBox thirdRowHBox=new HBox();
thirdRowHBox.setSpacing(50);
//Creating a arraylist of unique 52 cards which will store the each card number
//If that card number will be already present in the arraylist then that card will not be added
ArrayList<Integer> lstUnique52Cards=new ArrayList<Integer>();
//Creating a random class object
Random random=new Random();
//This loop will add the three cards in first row
while(lstUnique52Cards.size()<3) {
//Generate a randomNumber between 1 and 52 both inclusive
//Since random.NextInt(52) will return number from 0 to 51 Hence adding 1 to
//make it from 1 to 52
int randomNumber=random.nextInt(52)+1;
//If the current random generated is not present in the array list lstUnique52Cards
//it means that the random number is unique then add that random number in array list lstUnique52Cards
//then create the correpsonding ImageView with the card number represented by randomNumber
//Then add the image to the firstRowHBox
if(!lstUnique52Cards.contains(randomNumber)) {
lstUnique52Cards.add(randomNumber);
ImageView imgViewCard=new ImageView(new Image("c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
firstRowHBox.getChildren().add(imgViewCard);
}
}
//This loop will add the three joker cards in second row
//Here the uniqueness doesn't matter for the card
for(int i=1;i<=3;i++) {
//Below statement random.nextInt(2) will generate two random numbers 0 and 1 only as we are having
//only two joker cards. Since two joker cards images number are 53.png and 54.png.
//Hence adding 53 to get that correpsonding joker card number
int randomNumber=random.nextInt(2)+53;
//Creating ImageView object with the given card number image
ImageView imgViewCard=new ImageView(new Image("c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
//If the value of i is 1 i.e. it is first card then set the rotation angle as 45
if(i==1)
imgViewCard.setRotate(45);
//If the value of i is 2 i.e. it is second card then set the rotation angle as 90
if(i==2)
imgViewCard.setRotate(90);
//If the value of i is 3 i.e. it is third card then set the rotation angle as 135
if(i==3)
imgViewCard.setRotate(135);
//Add the imgViewCard in secondRowHBox
secondRowHBox.getChildren().add(imgViewCard);
}
//This loop will add the three more unique cards
//Initializing cardNumber with 1
int cardNumber=1;
while(lstUnique52Cards.size()<6) {
//Generate a randomNumber between 1 and 52 both inclusive
//Since random.NextInt(52) will return number from 0 to 51 Hence adding 1 to
//make it from 1 to 52
int randomNumber=random.nextInt(52)+1;
//If the current random generated is not present in the array list lstUnique52Cards
//it means that the random number is unique then add that random number in array list lstUnique52Cards
//then create the correpsonding ImageView with the card number represented by randomNumber
//Also set the correpsonding angle to the cardNumber of this thirdRowHBox
//Then add the image view card to the thirdRowHBox
if(!lstUnique52Cards.contains(randomNumber)) {
lstUnique52Cards.add(randomNumber);
ImageView imgViewCard=new ImageView(new Image("c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
if(cardNumber==1)
imgViewCard.setRotate(135);
if(cardNumber==2)
imgViewCard.setRotate(90);
if(cardNumber==3)
imgViewCard.setRotate(45);
thirdRowHBox.getChildren().add(imgViewCard);
cardNumber++; //Increment cardNumber by 1
}
}
//Add all the three HBox objects in the vBox
vBox.getChildren().add(firstRowHBox);
vBox.getChildren().add(secondRowHBox);
vBox.getChildren().add(thirdRowHBox);
//Create a scene object with the child as vBox
Scene scene = new Scene(vBox ,450, 450);
//Setting the stage title as Cards
stage.setTitle("Cards");
//Setting the scene to the stage
stage.setScene(scene);
//Showing the stage
stage.show();
}
//Main method it will invoke start method of Application class
public static void main(String[] args) {
launch(args);
}
}
错误：
ant -f c:\Users\Desktop\Tempory\card jfxsa-run
init:
Deleting: c:\Users\Desktop\Tempory\card\build\built-jar.properties
deps-jar:
Updating property file: c:\Users\Desktop\Tempory\card\build\built-jar.properties
compile:
Detected JavaFX Ant API version 1.3
jfx-deployment:
jar:
Copying 12 files to c:\Users\Desktop\Tempory\card\dist\run395293642
jfx-project-run:
Executing c:\Users\Desktop\Tempory\card\dist\run395293642\JavaFXCards.jar using platform C:\Program Files\Java\jdk1.8.0_221\jre/bin/java
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
at javafx.scene.image.Image.validateUrl(Image.java:1121)
at javafx.scene.image.Image.<init>(Image.java:620)
at JavaFXCardGUI.start(JavaFXCardGUI.java:58)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null(WinApplication.java:177)
... 1 more
Caused by: java.net.MalformedURLException: unknown protocol: c
at java.net.URL.<init>(URL.java:607)
at java.net.URL.<init>(URL.java:497)
at java.net.URL.<init>(URL.java:446)
at javafx.scene.image.Image.validateUrl(Image.java:1115)
... 11 more
Exception running application JavaFXCardGUI
Java Result: 1
Deleting directory c:\Users\Desktop\Tempory\card\dist\run395293642
jfxsa-run:
BUILD SUCCESSFUL (total time: 2 seconds)
格式错误URL异常 - 您提供了错误的 URL 字符串；您需要做的就是在图像路径之前添加 "file:"，就像这样 - new Image("file:c:\Users\Desktop\Tempory\card"+randomNumber+".png")。
请记住始终使用 file: 协议作为本地文件路径的前缀。
缺少图像文件路径前面的文件协议：
ImageView imgViewCard=new ImageView(new Image("file:\\c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
我创建了这个 javaFx class 来以不同的角度洗牌和展示扑克牌。但是突然我得到了一个错误。我试图修复它，但我仍然无法让它工作。下面的代码给出了代码解释。 该程序假设选择随机的 png 卡片图像并显示在第一行。第二行以不同的角度展示了三张小丑牌。第三行以三个不同的角度展示了另外三张不同的卡片
代码：
import java.util.ArrayList;
import java.util.Random;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
//Creating class JavaFXCardGUI which is extending Application class
//Now JavaFXCardGUI class will act as an JavaFX Application
public class JavaFXCards extends Application{
//Overriding start method of Application class which is always a starting point of any JavaFX Application
@Override
public void start(Stage stage) throws Exception {
//Creating a VBox object
VBox vBox=new VBox();
//Setting its spacing and padding
vBox.setSpacing(50);
vBox.setPadding(new Insets(20, 40, 40, 60));
//Creating a HBox object which will store the first row cards and setting its spacing property
HBox firstRowHBox=new HBox();
firstRowHBox.setSpacing(50);
//Creating a HBox object which will store the second row cards and setting its spacing property
HBox secondRowHBox=new HBox();
secondRowHBox.setSpacing(50);
//Creating a HBox object which will store the third row cards and setting its spacing property
HBox thirdRowHBox=new HBox();
thirdRowHBox.setSpacing(50);
//Creating a arraylist of unique 52 cards which will store the each card number
//If that card number will be already present in the arraylist then that card will not be added
ArrayList<Integer> lstUnique52Cards=new ArrayList<Integer>();
//Creating a random class object
Random random=new Random();
//This loop will add the three cards in first row
while(lstUnique52Cards.size()<3) {
//Generate a randomNumber between 1 and 52 both inclusive
//Since random.NextInt(52) will return number from 0 to 51 Hence adding 1 to
//make it from 1 to 52
int randomNumber=random.nextInt(52)+1;
//If the current random generated is not present in the array list lstUnique52Cards
//it means that the random number is unique then add that random number in array list lstUnique52Cards
//then create the correpsonding ImageView with the card number represented by randomNumber
//Then add the image to the firstRowHBox
if(!lstUnique52Cards.contains(randomNumber)) {
lstUnique52Cards.add(randomNumber);
ImageView imgViewCard=new ImageView(new Image("c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
firstRowHBox.getChildren().add(imgViewCard);
}
}
//This loop will add the three joker cards in second row
//Here the uniqueness doesn't matter for the card
for(int i=1;i<=3;i++) {
//Below statement random.nextInt(2) will generate two random numbers 0 and 1 only as we are having
//only two joker cards. Since two joker cards images number are 53.png and 54.png.
//Hence adding 53 to get that correpsonding joker card number
int randomNumber=random.nextInt(2)+53;
//Creating ImageView object with the given card number image
ImageView imgViewCard=new ImageView(new Image("c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
//If the value of i is 1 i.e. it is first card then set the rotation angle as 45
if(i==1)
imgViewCard.setRotate(45);
//If the value of i is 2 i.e. it is second card then set the rotation angle as 90
if(i==2)
imgViewCard.setRotate(90);
//If the value of i is 3 i.e. it is third card then set the rotation angle as 135
if(i==3)
imgViewCard.setRotate(135);
//Add the imgViewCard in secondRowHBox
secondRowHBox.getChildren().add(imgViewCard);
}
//This loop will add the three more unique cards
//Initializing cardNumber with 1
int cardNumber=1;
while(lstUnique52Cards.size()<6) {
//Generate a randomNumber between 1 and 52 both inclusive
//Since random.NextInt(52) will return number from 0 to 51 Hence adding 1 to
//make it from 1 to 52
int randomNumber=random.nextInt(52)+1;
//If the current random generated is not present in the array list lstUnique52Cards
//it means that the random number is unique then add that random number in array list lstUnique52Cards
//then create the correpsonding ImageView with the card number represented by randomNumber
//Also set the correpsonding angle to the cardNumber of this thirdRowHBox
//Then add the image view card to the thirdRowHBox
if(!lstUnique52Cards.contains(randomNumber)) {
lstUnique52Cards.add(randomNumber);
ImageView imgViewCard=new ImageView(new Image("c:\Users\Desktop\Tempory\card"+randomNumber+".png"));
if(cardNumber==1)
imgViewCard.setRotate(135);
if(cardNumber==2)
imgViewCard.setRotate(90);
if(cardNumber==3)
imgViewCard.setRotate(45);
thirdRowHBox.getChildren().add(imgViewCard);
cardNumber++; //Increment cardNumber by 1
}
}
//Add all the three HBox objects in the vBox
vBox.getChildren().add(firstRowHBox);
vBox.getChildren().add(secondRowHBox);
vBox.getChildren().add(thirdRowHBox);
//Create a scene object with the child as vBox
Scene scene = new Scene(vBox ,450, 450);
//Setting the stage title as Cards
stage.setTitle("Cards");
//Setting the scene to the stage
stage.setScene(scene);
//Showing the stage
stage.show();
}
//Main method it will invoke start method of Application class
public static void main(String[] args) {
launch(args);
}
}
错误：
ant -f c:\Users\Desktop\Tempory\card jfxsa-run
init:
Deleting: c:\Users\Desktop\Tempory\card\build\built-jar.properties
deps-jar:
Updating property file: c:\Users\Desktop\Tempory\card\build\built-jar.properties
compile:
Detected JavaFX Ant API version 1.3
jfx-deployment:
jar:
Copying 12 files to c:\Users\Desktop\Tempory\card\dist\run395293642
jfx-project-run:
Executing c:\Users\Desktop\Tempory\card\dist\run395293642\JavaFXCards.jar using platform C:\Program Files\Java\jdk1.8.0_221\jre/bin/java
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Invalid URL: unknown protocol: c
at javafx.scene.image.Image.validateUrl(Image.java:1121)
at javafx.scene.image.Image.<init>(Image.java:620)
at JavaFXCardGUI.start(JavaFXCardGUI.java:58)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null(WinApplication.java:177)
... 1 more
Caused by: java.net.MalformedURLException: unknown protocol: c
at java.net.URL.<init>(URL.java:607)
at java.net.URL.<init>(URL.java:497)
at java.net.URL.<init>(URL.java:446)
at javafx.scene.image.Image.validateUrl(Image.java:1115)
... 11 more
Exception running application JavaFXCardGUI
Java Result: 1
Deleting directory c:\Users\Desktop\Tempory\card\dist\run395293642
jfxsa-run:
BUILD SUCCESSFUL (total time: 2 seconds)
格式错误URL异常 - 您提供了错误的 URL 字符串；您需要做的就是在图像路径之前添加 "file:"，就像这样 - new Image("file:c:\Users\Desktop\Tempory\card"+randomNumber+".png")。
请记住始终使用 file: 协议作为本地文件路径的前缀。
缺少图像文件路径前面的文件协议：
ImageView imgViewCard=new ImageView(new Image("file:\\c:\Users\Desktop\Tempory\card"+randomNumber+".png"));