java 在 Struts 2 中使用带有动态参数的 ActionForward
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Using ActionForward with dynamic params in Struts 2
提问by john
While migrating the application from Struts 1 to Struts 2
将应用程序从 Struts 1 迁移到 Struts 2 时
In some of the places, the same action class has been used for different type of views, based on the request params.
在某些地方，基于请求参数，相同的动作类已用于不同类型的视图。
For Example: if the createTypeis 1 means need to append one param or if the createTypeis 2 means need to append some more extra params, like that I need to pass dynamic params to some other action using ActionForward.
例如：如果createTypeis 1 意味着需要附加一个参数，或者如果createTypeis 2 意味着需要附加一些额外的参数，就像我需要使用ActionForward.
struts-config.xml
struts-config.xml
<action path="/CommonAction" type="com.example.CommonAction" scope="request">
<forward name="viewAction" path = "/ViewAction.do"/>
</action>
Action Class
动作类
public class CreateAction extends Action
{
public ActionForward execute(ActionMapping m, ActionForm f, HttpServletRequest req, HttpServletResponse res) throws ServletException, Exception
{
String actionPath = m.findForward("viewAction").getPath();
String createType = req.getParameter("createType");
String params = "&action=view";
if("1".equals(createType)){
params = params + "&from=list";
}else if("2".equals(createType)){
params = params + "&from=detail&someParam=someValue";
}//,etc..
String actionUrl = actionPath+"?"+params;
return new ActionForward(actionUrl);
}
}
But, I not able to do the same thing in Struts 2. Is there any possibilities to use ActionForwardwith dynamic params in Struts 2 ?
但是，我无法在 Struts 2 中做同样的事情。是否有可能ActionForward在 Struts 2 中使用动态参数？
回答by Roman C
You could use a dynamic parameters with a result, see the dynamic result configuration.
您可以使用带有 的动态参数result，请参阅动态结果配置。
In the action you should write a getter for the patrameter
在操作中，您应该为参数编写一个 getter
private String actionUrl;
public String getActionUrl() {
return actionUrl;
}
and configure result
并配置结果
<action name="create" class="CreateAction">
<result type="redirect">${actionUrl}</result>
</action>
So, the common sense would be rewrite the code like
所以，常识是重写代码，如
public class CreateAction extends ActionSupport
{
private String actionUrl;
public String getActionUrl() {
return actionUrl;
}
@Override
public String execute() throws Exception
{
String actionPath = "/view";
String createType = req.getParameter("createType");
String params = "&action=view";
if("1".equals(createType)){
params = params + "&from=list";
}else if("2".equals(createType)){
params = params + "&from=detail&someParam=someValue";
}//,etc..
actionUrl = actionPath+"?"+params;
return SUCCESS;
}
}
If you need a better way to create the urls from action mapping, you could look at thisanswer.
如果您需要更好的方法来从动作映射创建 url，您可以查看此答案。
