在web.xml中添加如下代码：

<servlet>

<servlet-name>dwr-invoker</servlet-name>

<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>

<init-param>

<param-name>debug</param-name>

<param-value>false</param-value>

</init-param>

<!-- crossDomainSessionSecurity设置成false表示允许跨域访问 避免浏览器报session error -->

<init-param>

<param-name>crossDomainSessionSecurity</param-name>

<param-value>false</param-value>

</init-param>

<init-param>

<param-name>allowGetForSafariButMakeForgeryEasier</param-name>

<param-value>true</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>