spring的普通类中如何取session和request对像

在使用spring时,经常需要在普通类中获取session,request等对像. 
比如一些AOP拦截器类,在有使用struts2时,因为struts2有一个接口使用org.apache.struts2.ServletActionContext即可很方便的取到session对像. 

用法:ServletActionContext.getRequest().getSession(); 

但在单独使用spring时如何在普通类中获取session,reuqest呢? 

第一种：
在web.xml增加如下代码: 

  <listener> 
     <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> 
  </listener> 

注解方式

@Autowired  
private HttpSession session;    
@Autowired  
private HttpServletRequest request;  

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); 

第二种：

public class RequestUtils {
	private static final Logger log = LoggerFactory
			.getLogger(RequestUtils.class);
	private static ThreadLocal<HttpServletRequest> requestLocal= new ThreadLocal<HttpServletRequest>();
	

	public static HttpServletRequest getRequest() {
		 return (HttpServletRequest)requestLocal.get();  
	}

	public static void setRequest(HttpServletRequest request) {
		  requestLocal.set(request);  
	}
}

public class GetRequest implements Filter {

    /**
     * Default constructor. 
     */
    public GetRequest() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		RequestUtils.setRequest((HttpServletRequest)request);
		// pass the request along the filter chain
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}

在web.xml增加如下代码: 

<filter>
                <filter-name>GetRequest</filter-name>
		<filter-class>com.filter.GetRequest</filter-class>
</filter>
	<filter-mapping>
		<filter-name>GetRequest</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>