springaop拦截业务方法，实现权限控制示例

public class SysContext { 
  private static ThreadLocal requestLocal=new ThreadLocal(); 
  private static ThreadLocal respOnseLocal=new ThreadLocal(); 
  
  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(); 
  } 
 } 

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 { 
   
  } 
 
 } 
 

 
  sessionFilter 
  comuneifilterGetContextFilter 
  
 
  
  sessionFilter 
  * 
  

@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(); 
    } 
   } 
  } 
 }