无法从 JAR 文件中导入资源

Question

我对 java 还是很陌生，因此一直致力于将即时通讯程序从 autoit 转换为 java。现在一切正常，除了完全重新编码和重组后，JAR 中包含的图像不再正确加载。我尝试了几个在 stackoverflow 上找到的解决方案，但我似乎无法弄清楚我做错了什么。

我尝试删除图像资源并重新添加它们，然后更改代码中的相对路径，并确保使用正确的 CaSe。

public static Image icon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/earth-icon.png"));
    public static Image iconTray = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/earth-icon16.png"));
    public static Image settingsIcon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/gnome_preferences_system.png"));
    public static Image fontIcon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/font-x-generic-icon.png"));
    public static Image mailIcon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/e_mail32.png"));
    public static Image profileIconMain = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/user_silhouette.png"));
    public static Image accountIcon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/vcard.png"));
    public static Image fileTransferIcon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/resources/icons/transfer_document32.png"));

    public static ImageIcon profileIcon = new ImageIcon(Constants.class.getResource("/resources/icons/user_silhouette.png"));
    public static ImageIcon onlineIcon = new ImageIcon(Constants.class.getResource("/resources/icons/buddy_online.png"));
    public static ImageIcon awayIcon = new ImageIcon(Constants.class.getResource("/resources/icons/buddy_away.png"));
    public static ImageIcon dndIcon = new ImageIcon(Constants.class.getResource("/resources/icons/buddy_dnd.png"));
    public static ImageIcon offlineIcon = new ImageIcon(Constants.class.getResource("/resources/icons/buddy_offline.png"));
    public static ImageIcon fontIcon2 = new ImageIcon(PersonalMessage.class.getResource("/resources/icons/font.png"));
    public static ImageIcon emoticonIcon = new ImageIcon(PersonalMessage.class.getResource("/resources/icons/regular_smile.png"));
    public static ImageIcon nudgeIcon = new ImageIcon(PersonalMessage.class.getResource("/resources/icons/nudge.png"));
    public static ImageIcon addIcon = new ImageIcon(PersonalMessage.class.getResource("/resources/icons/buddy_add.png"));
    public static ImageIcon transferIcon = new ImageIcon(PersonalMessage.class.getResource("/resources/icons/Transfer.png"));

图标应该加载到 gui 中，但我收到以下错误

0xa5c9ba21dd6c5fb60de9ddc165f5917434387250Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
    at SIM.net.client.gui.loginFrame$2.actionPerformed(loginFrame.java:155)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$500(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at sun.awt.SunToolkit.getImageFromHash(Unknown Source)
    at sun.awt.SunToolkit.getImage(Unknown Source)
    at SIM.net.client.Constants.<clinit>(Constants.java:65)
    ... 37 more

Answer 1

好的，我通过添加一个包含我所有资源的“资源”文件夹解决了这个问题，然后直接从根路径 (/) 加载它们

例子：

public static Image icon = Toolkit.getDefaultToolkit().getImage(Constants.class.getResource("/icons/earth-icon.png"));