System.out.println(invocation.getStack().findValue("workbook"));
这个打印出来是null
前台页面报错:
java.lang.IllegalStateException: getOutputStream() has already been called for this response
org.apache.coyote.tomcat5.CoyoteResponse.getWriter(CoyoteResponse.java:599)
org.apache.coyote.tomcat5.CoyoteResponseFacade.getWriter(CoyoteResponseFacade.java:163)
com.opensymphony.webwork.views.freemarker.FreemarkerServlet.process(FreemarkerServlet.java:229)
后台tomcat报错:
04-18 14:51:38.828 ERROR [ExceptionInterceptor.java:38] Caught exception while invoking action: compare.ExportToExcelToolAction@1f1c748
java.lang.NullPointerException
at compare.ExcelResult.execute(ExcelResult.java:38)
at com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:258)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:182)
at gxlu.webapps.umv.core.webwork.interceptor.AuditInterceptor.intercept(AuditInterceptor.java:46)