Java-无法读取输入文件

Question

我正在尝试将卡片的 png 图像加载到对象中，但我不断收到以下错误:

"C:\Program Files\Java\jdk-9\bin\java" "-javaagent:C:\Users\trevo\Documents\JetBrains\IntelliJ IDEA Community Edition 2017.2.5\lib\idea_rt.jar=60524:C:\Users\trevo\Documents\JetBrains\IntelliJ IDEA Community Edition 2017.2.5\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\trevo\Desktop\Deck\out\production\Deck com.company.Card_Class
Exception in thread "main" javax.imageio.IIOException: Can't read input file!
    at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1308)
    at com.company.Card_Class.main(Card_Class.java:21)

Process finished with exit code 1

这是我的代码:

package com.company;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class Card_Class {
    private String suit, face;
    private int value;
    private BufferedImage cardimage;

    public Card_Class(String suit, String face, int value, BufferedImage cardimage) {
        this.suit = suit;
        this.face = face;
        this.value = value;
        this.cardimage = cardimage;
    }

    public static void main(String[] args) throws IOException {
        Card_Class KingOfAxes = new Card_Class("Diamonds", "King", 13, ImageIO.read(new File("KingOfAxes.png")));
        System.out.println("King");
    }
}

我将所有 png 卡文件放在标有“deck”的文件夹中，这是项目名称。

Answer 1

尝试将完整的文件路径写入控制台，看看您的文件路径是否正确。

也许将文件的绝对路径打印到标准输出以查看路径是否正确。在使用之前，您还应该检查您的图像是否存在并且可读。以下是两者的示例:

public static void main(String[] args) throws IOException {
    System.out.println(new File("KingOfAxes.png").getAbsolutePath()); // Try this to pinpoint your issue
    File king = new File("KingOfAxes.png");

    if(king.canRead()){ // Check if your file exists and is readable before you use it
        JavaAssignmentPanel KingOfAxes = new JavaAssignmentPanel("Diamonds", "King", 13, ImageIO.read(new File("KingOfAxes.png")));
    } else{
        throw new IOException(king.getName() + " is not readable!"); // Not readable -> Throw exception
    }
    System.out.println("King");
}