问题:
文件路径没有错误,在IDE中能够运行,但是一旦打包后运行Jar文件会报错。
使用 jdk-16.0.2。
我的代码如下:
private Image icon_image = new ImageIcon(this.getClass().getResource("./assets/icon.png")).getImage();
private ImageIcon background_image = new ImageIcon(this.getClass().getResource("./assets/background.png"));
报错信息如下:
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null
at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:217)
at kmroiosn.picker.PickerFrame.<init>(PickerFrame.java:44)
at kmroiosn.picker.Main.main(Main.java:12)
改写成下面代码后打包文件也仍然报错:
private Image icon_image = new ImageIcon(requireNonNull(this.getClass().getResource("./assets/icon.png"))).getImage();
private ImageIcon background_image = new ImageIcon(requireNonNull(this.getClass().getResource("./assets/background.png")));
导出为Jar文件后:
this.getClass().getResource("./assets/icon.png"); //返回值均为null
this.getClass().getResource("./assets");
this.getClass().getResource("./");
若有办法解决本人不胜感激!