[英]how to return to the invoke action in struts2
我正在使用struts 2,现在我有a,b,c,d四个动作。 在所有四个页面中都有一个"mobile view"
链接,如果单击该链接,它将转到mobileCheck action
来设置会话。 因此,在执行mobileCheck操作之后,我想返回到调用操作,例如
1. click link in action a ==>mobileCheck action ==> return to a.action
2. click link in action b ==>mobileCheck action ==> return to b.action
3. click link in action c ==>mobileCheck action ==> return to c.action
4. click link in action d ==>mobileCheck action ==> return to d.action
在我的项目中有数十种这样的操作,是否需要设置任何变量,我应该怎么做,非常感谢。
如果所有这些动作都具有相同的业务,那么更好的设计是使每个动作都扩展MobileCheck动作 。
修改MobileCheck Action以使用public String mobileView()
方法(而不是execute)进行业务;
修改动作A,B,C,D进行扩展( public class ActionA extends MobileCheck
),并将其业务包含在execute()
;
最后,使mobileView()
方法返回execute()
:它将返回您正在运行的Action的execute()
方法:
public class MobileCheck extends ActionSupport {
public String execute() throws Exception{
log.debug("MobileCheck execute() should never be invoked");
return SUCCESS;
}
public String mobileView() throws Exception{
// do something
log.debug("mobileView() business performed");
return execute(); /* THIS IS THE TRICK */
}
}
public class ActionA extends MobileCheck {
public String execute() throws Exception{
// do something
log.debug("ActionA execute() is invoked");
return SUCCESS;
}
}
public class ActionB extends MobileCheck {
public String execute() throws Exception{
// do something
log.debug("ActionB execute() is invoked");
return SUCCESS;
}
}
a.jsp
<s:form>
<s:submit method="mobileView" action="actionA"
value="call mobileView() and re-execute Action A" />
</s:form>
b.jsp
<s:form>
<s:submit method="mobileView" action="actionB"
value="call mobileView() and re-execute Action B" />
</s:form>
struts.xml
<action name="actionA" class="foo.bar.ActionA">
<result>a.jsp</result>
</action>
<action name="actionB" class="foo.bar.ActionB">
<result>b.jsp</result>
</action>
亲吻的胜利范例
我这样解决了这个问题,我将URL保存在会话中,并保存在action类中,将该会话值保存到nextURL变量中,然后操作结果将使用此变量$ {nextURL}进行重定向。
1)在每个a,b,c,d jsp中,都包含相同的代码:
<ul>
<li><a href="<s:url action="viewFullSite.action" namespace="" />" id="viewFullSite">View Full Site</a></li>
</ul>
并保存当前页面uri:
HttpServletRequest req = ServletActionContext.getRequest();
String uri = "";
String paramString = "";
if(ServletActionContext.getActionMapping()!=null){
String namespace = ServletActionContext.getActionMapping().getNamespace();
String action = ServletActionContext.getActionMapping().getName();
uri = namespace + "/" + action + ".action";
if (req.getQueryString() != null){
paramString = "?" + req.getQueryString();
uri += paramString;
}
req.getSession().setAttribute(RequestParam.invoke_uri.toString(), uri);
}
2)在xml中:
<action name="viewFullSite" class="tlc.ui.action.MobileOrFullViewSwitch" method="switchFullSiteView">
<result name="success_nextURL" type="redirect">${nextURL}</result>
</action>
3)在动作类中:
public class MobileOrFullViewSwitch extends TLCAction {
private static final Logger logger = LoggerManager.getLogger(Account.class);
private String nextURL = "";
public String switchFullSiteView(){
request.getSession().setAttribute(SessionConstants.IGNORE_MOBILEVIEW, "true");
// set the nextURL property if it was specified
this.nextURL = (String)request.getSession().getAttribute(RequestParam.invoke_uri.toString());
if (this.nextURL == null) this.nextURL = "";
// security check: only support relative URLs; anything else is ignored
if (!this.nextURL.startsWith("/")) this.nextURL = "";
if (isEmpty(this.nextURL)) {
this.nextURL = "/home.action";
}
return ResultCode.SUCCESS_NEXT_URL;
}
public String switchMobileView(){
return ResultCode.SUCCESS_NEXT_URL;
}
public String getNextURL() {
return nextURL;
}
}
它可以工作,但是如果有更容易实现的方法,请指出。 谢谢。
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