使用ImageIcon（getClass（）。getResource（）将图像添加到Eclipse Java项目中

Question

Can anyone help why am I getting error for my Java swing application that makes use of

ImageIcon(getClass().getResource()

to load images as shown below. Thanks in advance.

Code where error is shown:

jButton9.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/folder63.png"))); 

Error description:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at frame.foundation.initComponents(foundation.java:282)
at frame.foundation.<init>(foundation.java:21)
at frame.foundation$127.run(foundation.java:3453)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(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$1.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)

PS: I have also added "images" folder as the source folder in my project

Folder Structure:

myprojectName  
         |  
         |___src  
         |     |  
         |     |___frame //(is my package)  
         |            |  
         |            |__foundation.java // main class  
         |  
         |__images  
         |    |  
         |    |__folder63.png  
         |    |__d.jpg  
         |    |__e.jpg  
         |    |__f.jpg    

Answer 1

Make sure image file is present at correct location. It should be under src/images folder.

You can try any one based on image location.

// Read from same package 
ImageIO.read(getClass().getResourceAsStream("folder63.png"));

// Read from images folder parallel to src in your project
ImageIO.read(new File("images/folder63.jpg"));

// Read from src/images folder
ImageIO.read(getClass().getResource("/images/folder63.png"))

// Read from src/images folder
ImageIO.read(getClass().getResourceAsStream("/images/folder63.png"))

Read more...

It's worth reading Java Tutorial on Loading Images Using getResource

Answer 2

尝试这个

InputStream input = classLoader.getResourceAsStream("image.jpg");