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在很多程序请求是都有等待的页面!
在WebWork2.1.1开始,就新增了一个拦截器:execAndWait
<interceptor name="execAndWait" class="com.opensymphony.webwork.interceptor.ExecuteAndWaitInterceptor"/>
execAndWait将请求的Action放到后台执行,同时返回"wait"的输出结果;再次同样的Action请求,如果Action执行完毕,它将返回
真正的输出结果。
注意:"wait"输出等待页面时必须包含下面语句:
<meta http-equiv="refresh" content="5;url="<ww:url includeParams="'all'" />">
它每隔5秒钟,重新刷新前面的action请求。
 
Example:
// WaitAction.java
package example.wait;
import com.opensymphony.xwork.Action;
public class WaitAction implements Action{
 public String execute() throws Exception {
  try {
            System.out.println("-----start sleep!");
            Thread.sleep(2000 * 10);
            System.out.println("-----end sleep!");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
  return SUCCESS;
 }
}
 
xwork.xml:
 <action name="wait" class="example.wait.WaitAction">
            <result name="success" type="dispatcher">
                <param name="location">/success.jsp</param>
            </result>
            <result name="wait" type="dispatcher">
                <param name="location">/wait.jsp</param>
            </result>
            <interceptor-ref name="execAndWait"/>
        </action>

wait.jsp:
<%@ taglib uri="webwork" prefix="ww" %>
<HTML>
<HEAD>
<meta http-equiv="refresh" content="5;url="<ww:url includeParams="'all'" />">
</HEAD>
<BODY>
Wait..............
</BODY>
</HTML>
posted on 2006-11-08 17:13 larryjava 阅读(455) 评论(0)  编辑  收藏

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