flex实现session-优快云博客

本文介绍了一种在Flex应用中实现会话管理的方法。通过自定义过滤器AMFContextFilter及拦截器FlexSessionInterceptor，结合ThreadLocal实现了跨请求的会话状态保持。文中详细展示了如何在web.xml中配置过滤器，并在Java类中获取会话。

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tomcat中的session实现类是StandardSession，
其中Manager 这个接口在StandardSession中有被用到。

1.5jdk中用到了ConcurrentHashMap。
但是flex中本身是没有提供session接口的，那么该如何实现呢？参考别人的文章后总结如下：

1、在web.xml增加

Xml代码

<filter>
<filter-name>AMFContextFilter</filter-name>
<filter-class>soft.flex.context.AMFContextFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>AMFContextFilter</filter-name>
<servlet-name>MessageBrokerServlet</servlet-name>
</filter-mapping>

2、增加AMFContextFilter文件

Java代码

packagesoft.flex.context;
importjava.io.IOException;
importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassAMFContextFilterimplementsFilter{
publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,
FilterChainchain)throwsServletException,IOException{
AMFContext.setCurrentContext((HttpServletRequest)request,
(HttpServletResponse)response);
chain.doFilter(request,response);
}
publicvoidinit(FilterConfigarg0)throwsServletException{
//TODOAuto-generatedmethodstub
}
publicvoiddestroy(){
//TODOAuto-generatedmethodstub
}
}

3、增加AMFContext文件

Java代码

packagesoft.flex.context;
importjavax.servlet.ServletContext;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;
publicclassAMFContext{
/**
*ThreadLocalobjectforstoringobjectincurrentthread.
*/
@SuppressWarnings("unchecked")
privatestaticThreadLocaltl=newThreadLocal();
/**
*Setcurrentcontext
*
*@paramrequest
*TheHttpRequestobject
*@paramresponse
*TheHttpResponsesobject
*/
@SuppressWarnings("unchecked")
staticpublicvoidsetCurrentContext(HttpServletRequestrequest,
HttpServletResponseresponse){
AMFContextc=getCurrentContext();
if(c==null){
c=newAMFContext(request,response);
tl.set(c);
}else{
c.setRequest(request);
c.setResponse(response);
}
}
/**
*Getcurrentcontextvalue
*
*@returnThecurrentcontext
*/
staticpublicAMFContextgetCurrentContext(){
return(AMFContext)tl.get();
}
//----------------------------------------------------------
//
//Classmembers
//
//----------------------------------------------------------
/**
*Thehttprequestobject.Thelifecycleoftherequestobjectisdefined
*astherequestscope.Itmaybereusedinanotherincomingconnection,so
*dontuseitinanotherthread.
*/
privateHttpServletRequestrequest;
/**
*Thehttpresponseobject.Thelifecycleoftheresponseobjectisdefined
*astherequestscope.Dontuseitinanotherthread.Alsodontwrite
*outputtotheresponsewhenitisusedinthecontext,butyoumaygetor
*setsomeresponseheaderwhenitissafe.
*/
privateHttpServletResponseresponse;
/**
*Theconstructorisprivate,togetaninstanceoftheAMFContext,please
*usegetCurrentContext()method.
*
*@paramrequest
*@paramresponse
*/
privateAMFContext(HttpServletRequestrequest,HttpServletResponseresponse){
this.request=request;
this.response=response;
}
/**
*Getrequestobject
*
*@returnHttprequestobject
*/
publicHttpServletRequestgetRequest(){
returnrequest;
}
/**
*Setrequestobject
*
*@paramHttp
*requestobject
*/
publicvoidsetRequest(HttpServletRequestrequest){
this.request=request;
}
/**
*Getresponseobject
*
*@returnHttpresponseobject
*/
publicHttpServletResponsegetResponse(){
returnresponse;
}
/**
*Setresponseobject
*
*@paramresponse
*Httpresponseobject
*/
publicvoidsetResponse(HttpServletResponseresponse){
this.response=response;
}
/**
*Gettheservletcontext
*
*@return
*/
publicServletContextgetServletContext(){
HttpSessionsession=this.getSession();
returnsession.getServletContext();
}
/**
*Getthecurrentrunningsession
*
*@return
*/
publicHttpSessiongetSession(){
returnrequest.getSession();
}
/**
*Getanobjectstoredinthesession.
*
*@paramattr
*AttributeName
*@returnThevaluestoredundertheattributename.
*/
publicObjectgetSessionAttribute(Stringattr){
HttpSessionsession=this.getSession();
returnsession.getAttribute(attr);
}
/**
*Storeanobjectinthesession.
*
*@paramattr
*AttributeName
*@paramvalue
*Thevalue.
*/
publicvoidsetSessionAttribute(Stringattr,Objectvalue){
HttpSessionsession=this.getSession();
session.setAttribute(attr,value);
}
/**
*Getanobjectstoredintheservletcontext.
*
*@paramattr
*AttributeName
*@returnThevaluestoredundertheattributename.
*/
publicObjectgetContextAttribute(Stringattr){
ServletContextsc=this.getServletContext();
returnsc.getAttribute(attr);
}
/**
*Storeanobjectintheservletcontext.
*
*@paramattr
*AttributeName
*@paramvalue
*Thevalue.
*/
publicvoidsetContextAttribute(Stringattr,Objectvalue){
ServletContextsc=this.getServletContext();
sc.setAttribute(attr,value);
}
/**
*Getanobjectstoredinthecurrentrequest.
*
*@paramattr
*AttributeName
*@returnThevaluestoredundertheattributename.
*/
publicObjectgetRequestAttribute(Stringattr){
returnrequest.getAttribute(attr);
}
/**
*Storeanobjectinthecurrentrequest.
*
*@paramattr
*AttributeName
*@paramvalue
*Thevalue.
*/
publicvoidsetRequestAttribute(Stringattr,Objectvalue){
request.setAttribute(attr,value);
}
}

4、增加FlexSessionInterceptor文件

Java代码

packagesoft.flex.context;
importjavax.servlet.http.HttpServletRequest;
importorg.aopalliance.intercept.MethodInterceptor;
importorg.aopalliance.intercept.MethodInvocation;
importsoft.common.util.Constants;
publicclassFlexSessionInterceptorimplementsMethodInterceptor{
publicObjectinvoke(MethodInvocationinvocation)throwsThrowable{
AMFContextcontext=AMFContext.getCurrentContext();
HttpServletRequestrequest=context.getRequest();
if(request.getSession().getAttribute(Constants.LOGIN_USER_INFO)==null){
thrownewException("Session超时，请您重新登陆！");
}
returninvocation.proceed();
}
}

5、在applicationContext.xml增加以下内容

Xml代码

<beanid="sessionAdvice"class="soft.flex.context.FlexSessionInterceptor"/>
<beanid="beanNameAutoProxyCreator"
class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<propertyname="beanNames">
<list>
<value>formDesignerService</value>
</list>
</property>
<propertyname="interceptorNames">
<value>sessionAdvice</value>
</property>
</bean>

这样子的话，在所有的flex请求中都会先执行FlexSessionInterceptor类中的invoke方法如果要在任何java类中获取sessionr的话，使用AMFContext.getCurrentContext().getSession()即可。
其实就是用ThreadLocal这个jdk1.5中的本地线程类完成的。