Eclipse 打包的时候XML文件内容读取不到

Question

打包成功，加载XML文件，读取不到XML的内容，下面是读取XML的方法
   URL urlfile=prover_viewsetting.method_achieve.Vs_MethodAchieve_TheoremList.class.getResource("/prover_files/DetailRules.xml");
   //System.out.println(urlfile.toURI());
   File filename = new File(urlfile.toURI());
代码如上报错的信息如下
java.lang.NullPointerException
        at prover_viewsetting.method_achieve.Vs_MethodAchieve_TheoremList.getTre
eNodedata(Vs_MethodAchieve_TheoremList.java:191)
        at prover_viewsetting.method_achieve.Vs_MethodAchieve_TheoremList.create
TreeNode_topTree(Vs_MethodAchieve_TheoremList.java:82)
        at prover_viewsetting.object_use.Vs_ObjectUse_TheoremList.object_Use_Cre
ateTopTree(Vs_ObjectUse_TheoremList.java:29)
        at prover_view.V_CenterWindow.getTopTree(V_CenterWindow.java:842)
        at prover_view.V_CenterWindow.getTopscrollPane(V_CenterWindow.java:815)
        at prover_view.V_CenterWindow.gettheorem_Axiom_SplitPane(V_CenterWindow.
java:754)
        at prover_view.V_CenterWindow.getleft_Panel(V_CenterWindow.java:398)
        at prover_view.V_CenterWindow.<init>(V_CenterWindow.java:265)
        at prover_view.V_CenterWindow.main(V_CenterWindow.java:242)
java.lang.NullPointerException
        at prover_viewsetting.method_achieve.Vs_MethodAchieve_TheoremList.getTre
eNodedata(Vs_MethodAchieve_TheoremList.java:191)
        at prover_viewsetting.method_achieve.Vs_MethodAchieve_TheoremList.create
TreeNode_baseTree(Vs_MethodAchieve_TheoremList.java:158)
        at prover_viewsetting.object_use.Vs_ObjectUse_TheoremList.object_Use_Cre
ateBaseTree(Vs_ObjectUse_TheoremList.java:35)
        at prover_view.V_CenterWindow.getBaseTree(V_CenterWindow.java:879)
        at prover_view.V_CenterWindow.getBasescrollPane(V_CenterWindow.java:826)
 
        at prover_view.V_CenterWindow.gettheorem_Axiom_SplitPane(V_CenterWindow.
java:755)
        at prover_view.V_CenterWindow.getleft_Panel(V_CenterWindow.java:398)
        at prover_view.V_CenterWindow.<init>(V_CenterWindow.java:265)