一个测试画面，代码如下：
- HTML code
<%@ page contentType = " text/html;charset=gb2312" %> <html><head><title>Test Action</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><%String name = null;if (session.getAttribute("name")! = null ) name = ( String )session.getAttribute("name");String host = java.net.InetAddress.getLocalHost().toString();%><body><br><br><center> The host is :<%=host %><br> Your session id is :<%=session.getId() %><br> Your session detail is :<%=session.toString() %><br> Your session context is :<%=session.getSessionContext() %><br><br><%if (name! = null ){ out.print( " Your name is " + name + "<br>" ); out.print( " The session is valid. " );}else{ out.print( " The session is invalid!!! " );}%><a href ="index.jsp">Return!</a></center></body><%if (session.getAttribute("name")! = null ) session.invalidate();%></html>这个画面是从另外一个画面跳转过来的，第一个画面显示正常，这个画面报错，由于对jsp不是很了解，请大家指点一下！谢谢！
报错信息如下：
11:37:15,392 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 8 in the jsp file: /test/session.jsp
Generated servlet error:
Syntax error on tokens, they can be merge to form !=
An error occurred at line: 22 in the jsp file: /test/session.jsp
Generated servlet error:
Syntax error on tokens, they can be merge to form !=
An error occurred at line: 33 in the jsp file: /test/session.jsp
Generated servlet error:
Syntax error on tokens, they can be merge to form !=
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErro
rHandler.java:84)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher
------解决方案--------------------------------------------------------
session.getAttribute("name")! = null
!和= 不能分开的吧
------解决方案--------------------------------------------------------
编译出错，！=有问题