优化UReportServlet中Spring上下文对象获取方式，以方便其它项目扩展

ureport2-console/src/main/java/com/bstek/ureport/console/UReportServlet.java

@@ -43,7 +43,7 @@ public class UReportServlet extends HttpServlet {
 	@Override
 	public void init(ServletConfig config) throws ServletException {
 		super.init(config);
-		WebApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
+		WebApplicationContext applicationContext = getWebApplicationContext(config);
 		Collection<ServletAction> handlers = applicationContext.getBeansOfType(ServletAction.class).values();
 		for (ServletAction handler : handlers) {
 			String url = handler.url();
@@ -53,6 +53,10 @@ public class UReportServlet extends HttpServlet {
 			actionMap.put(url, handler);
 		}
 	}
+	
+	protected WebApplicationContext getWebApplicationContext(ServletConfig config){
+		return WebApplicationContextUtils.getWebApplicationContext(config.getServletContext());
+	}
 
 	@Override
 	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {