如何在JSP和Servlet中实现forward功能? 50分相送!
小弟用的是Tomcat,Apache, JDK1.2,Win2K环境,编写了一个名为Servlet2.java的小Servlet程序,在这个程序里想实现: 当用户调用Servlet2进行一些处理后,将当前浏览器显示的内容改换为Servlet1,我在Servlet2中使用了如下的语句,编译通过,却不知为何无法实现显示Servlet1的内容?
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("Servlet1");
dispatcher.forward(request,response);
有时会显示如下信息:
Error: 500
Location: /examples/servlet/ServletInclude
Internal Servlet Error:
java.lang.NullPointerException
at ServletInclude.service(ServletInclude.java, Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java, Compiled Code)
另外不知道为何我总是无法在JSP中实现<jsp:forward..../>的功能,但是使用<jsp:include..../>却可以
不知哪位高人能指点一二? 50分相送!