DWR拦截器

最新推荐文章于 2018-09-08 16:39:37 发布

原创最新推荐文章于 2018-09-08 16:39:37 发布 · 1.6k 阅读

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#dwr #session #class #null

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本文介绍了一个基于DWR (Direct Web Remoting) 的Servlet配置示例，并展示了如何通过自定义Remoter类进行会话检查及权限验证。具体包括了web.xml中DWR Servlet的配置参数设置，如开启调试模式、指定Remoter实现类等。

web.xml

<servlet>
        <servlet-name>dwr</servlet-name>
        
        <servlet-class>
            org.directwebremoting.servlet.DwrServlet
        </servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>true</param-value>
            
        </init-param>
        <init-param>
            <param-name>
                org.directwebremoting.extend.Remoter
            </param-name>
            <param-value>filters.AuthorityDWRRemoter</param-value>
        </init-param>
        <init-param>
            <param-name>activeReverseAjaxEnabled</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>crossDomainSessionSecurity</param-name>

            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>exposeInternals</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>scriptCompressed</param-name>
            <param-value>true</param-value>
        </init-param>

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

处理类：

public class AuthorityDWRRemoter extends DefaultRemoter{

        public Replies execute( Calls calls )
        {
            HttpSession session = WebContextFactory.get().getSession();
            GlobalInput mGlobalInput=(GlobalInput) session.getAttribute("GI");

            //session检查
            if(mGlobalInput==null){
                    logOut();
                    return super.execute( new Calls() );
            }
            return super.execute( calls );
        }

        private void logOut()
        {
            WebContext wct = WebContextFactory.get();
            Util utilThis = new Util(wct.getScriptSession());
            utilThis.addScript( new ScriptBuffer("_DWRLogout()"));
        }
    }