难点：aop类是普通的java类，session是无法注入的，那么在有状态的系统中如何获取用户相关信息呢，session是必经之路啊，获取session就变的很重要。思索很久没有办法，后来在网上看到了解决办法。
思路是：
i. SysContext 成员变量 request,session,response
ii. Filter 目的是给 SysContext 中的成员赋值
iii.然后在AOP中使用这个SysContext的值
要用好，需要理解 ThreadLocal和 和Filter 执行顺序
1.aop获取request，response，session等
public class SysContext { private static ThreadLocal<HttpServletRequest> requestLocal=new ThreadLocal<HttpServletRequest>(); private static ThreadLocal<HttpServletResponse> responseLocal=new ThreadLocal<HttpServletResponse>(); public static HttpServletRequest getRequest(){ return requestLocalget(); } public static void setRequest(HttpServletRequest request){ requestLocalset(request); } public static HttpServletResponse getResponse(){ return responseLocalget(); } public static void setResponse(HttpServletResponse response){ responseLocalset(response); } public static HttpSession getSession(){ return (HttpSession)(getRequest())getSession(); } } 2.添加过滤器
public class GetContextFilter implements Filter{ @Override public void destroy() { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { SysContextsetRequest((HttpServletRequest)request); SysContextsetResponse((HttpServletResponse)response); chaindoFilter(request, response); } @Override public void init(FilterConfig config) throws ServletException { } } 3.配置web.xml
将这部分放置在最前面，这样可以过滤到所有的请求
<filter> <filter-name>sessionFilter</filter-name> <filter-class>comuneifilterGetContextFilter</filter-class> </filter> <filter-mapping> <filter-name>sessionFilter</filter-name> <url-pattern>*</url-pattern> </filter-mapping>
4.spring aop before
从session中取出用户名，如果不存在，抛出异常跳转，将错误信息放到request中
@Aspect public class AdminAspect { ActionContext context = ActionContextgetContext(); HttpServletRequest request; HttpServletResponse response; @Before("execution(* comuneiActionAdminActiongetPrivileges())") public void adminPrivilegeCheck() throws Throwable { HttpSession session = SysContextgetSession(); request = SysContextgetRequest(); response = SysContextgetResponse(); String userName = ""; try { userName = sessiongetAttribute("userName")toString(); if(userName==null||userNameequals("")) throw new Exception("no privilege"); } catch (Exception ex) { requestsetAttribute("msg", "{/"res/":/"" + "无权限" + "/"}"); try { requestgetRequestDispatcher("/jsp/jsonjsp")forward( request, response); } catch (ServletException e) { eprintStackTrace(); } catch (IOException e) { eprintStackTrace(); } } } } 5.applicationContext.xml
<bean id="adminAspect" class="comuneiaopAdminAspect"></bean>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持VeVb武林网。
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