JSP 如何通过 native 定义的method调用 dll 文件呢?

Question

JSP 如何通过 native 定义的method调用 dll 文件呢? 在用 java 编写代码时, 可以很容易的通过调用 native 定义的 medthod, 对 dll 文件的调用, 但是写成 JSP 总是报没有此方法和没有此类的错误, 
Jsp 如何通过 native 定义的method调用 dll 文件呢?

Answer 1

先在JAVA里定义方法，再用javah编译成头文件，再用VC编写。。在此调用时就OK了

Answer 2

在命令行可以正常运行, 但是在 Tomcat 上运行就总是报错: 
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.gsm_jsp._jspService(gsm_jsp.java:104)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NoClassDefFoundError
org.apache.jsp.gsm_jsp._jspService(gsm_jsp.java:62)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
--------------------------------------------------------------------------------Apache Tomcat/5.0.28