我遇到了运行jar文件的问题。如果我在eclipse中编译代码一切正常,但是当我导出到jar并尝试运行该程序时,它会引发错误。 错误是:jar文件中的图像资源出错
Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at game.ChessSquare.<init>(ChessSquare.java:17)
at game.ChessFrame.DrawField(ChessFrame.java:131)
at game.ChessFrame.<init>(ChessFrame.java:38)
at game.Chess.main(Chess.java:7)
所以这块抛出这个错误代码是
//text is something like "pawn" or "king".The whole image is an icon on the button
img = new ImageIcon(getClass().getResource("white/"+text+".png"));
据我了解,它不能找到图像,以便IMG变量为空。但我不明白为什么它在eclipse中运行。任何帮助?由于
PS @AndrewThompson
E:\Desktop>jar tvf chess.jar
49 Sat Feb 11 23:40:06 GMT 2012 META-INF/MANIFEST.MF
378 Sat Feb 11 22:51:04 GMT 2012 game/ChessFieldCoord.class
1932 Sat Feb 11 23:39:48 GMT 2012 game/ChessSquare.class
536 Sat Feb 11 22:51:04 GMT 2012 game/Chess.class
2122 Sat Feb 11 22:51:04 GMT 2012 game/Rook.class
2357 Sat Feb 11 22:51:04 GMT 2012 game/Bishop.class
1946 Sat Feb 11 22:51:04 GMT 2012 game/Queen.class
2127 Sat Feb 11 22:51:04 GMT 2012 game/Pawn.class
1630 Sat Feb 11 22:51:04 GMT 2012 game/Knight.class
878 Sat Feb 11 22:51:04 GMT 2012 game/Empty.class
1642 Sat Feb 11 22:51:04 GMT 2012 game/King.class
915 Sat Feb 11 22:52:32 GMT 2012 game/ChessFrame$1.class
841 Sat Feb 11 22:52:32 GMT 2012 game/ChessFrame$2.class
695 Sat Feb 11 22:52:32 GMT 2012 game/ChessFrame$3.class
3525 Sat Feb 11 22:52:32 GMT 2012 game/ChessFrame$Move.class
4675 Sat Feb 11 22:52:32 GMT 2012 game/ChessFrame.class
997 Sat Feb 11 22:51:04 GMT 2012 game/ChessFigure.class
928 Sat Feb 11 15:49:32 GMT 2012 game/black/bishop.png
1947 Sat Feb 11 15:49:10 GMT 2012 game/black/king.png
1247 Sat Feb 11 15:49:38 GMT 2012 game/black/knight.png
627 Sat Feb 11 15:49:44 GMT 2012 game/black/pawn.png
1668 Sat Feb 11 15:49:20 GMT 2012 game/black/queen.png
626 Sat Feb 11 15:49:26 GMT 2012 game/black/rook.png
1493 Sat Feb 11 15:48:30 GMT 2012 game/white/bishop.png
1889 Sat Feb 11 15:48:06 GMT 2012 game/white/king.png
1544 Sat Feb 11 15:48:40 GMT 2012 game/white/knight.png
1003 Sat Feb 11 15:48:48 GMT 2012 game/white/pawn.png
2440 Sat Feb 11 15:48:12 GMT 2012 game/white/queen.png
837 Sat Feb 11 15:48:20 GMT 2012 game/white/rook.png
发生错误是ChessSquare.class
你检查了最终的罐子里是什么? – 2012-02-12 02:32:53
检查.jar文件中的文件“white/XXX.png”。仅供参考,您可以使用标准的“winzip”命令(以及JDK“jar”命令行工具)查看/编辑jar文件。 – paulsm4 2012-02-12 02:34:21
http://i.stack.imgur.com/wPyuO.png - 这是chess.jar里面。我不明白的是为什么它从eclipse运行而不是从jar运行。文件夹结构总是相同的: – makey 2012-02-12 02:41:14