将对象列表从动作传递到渲染阶段 [英] Passing object list from the action to the render phase

问题描述

我正在使用Spring MVC for portlet，但发现了一个问题.

I'm working with spring MVC for portlets, and I found a problem.

我需要将对象列表从操作阶段传递到渲染阶段.我尝试使用setRenderParameter，如下所示:

I need to pass an Object List from the action phase to the render phase. I've tried to use the setRenderParameter, something like this:

actionresponse.setRenderParameter(String string, String[] strings);
actionresponse.setRenderParameter("myList",myList.toString());

这里有两种方法:

@RequestMapping(params = ACTION_MYACTION)
public final void doAction(MyBean search, Errors errors, ActionRequest actionrequest, ActionResponse actionresponse) {
    String processName = UtilLog.getProcessName(CLASS_NAME, "doAction");
    successMessage.clear();
    justlist = null;

    validateBean(consulta, errors);

    if (!errors.hasErrors()) {
        try {

            mylist = myBpelImpl.getList(search);
    actionresponse.setRenderParameter("myList",myList.toString());

        } catch (Exception ex) {
            LOG.error(processName, ex);
            processError(actionrequest, null, ex);
        }
    }

    informSuccessMessage(actionrequest, errors, status);

}

@RequestMapping(params = ACTION_MYACTION)
public final String doRender(@ModelAttribute(value = "myBean") MyBean search, Errors errors, RenderRequest renderrequest) {

List<otherBean> mylist =   renderrequest.getParameter("myList");

    renderrequest.setAttribute(ServletContextKeys.SC_JUSTIFICANTE_LIST, myList);

    return ServletContextKeys.SC_CONSULTA_JUSTIFICANTES;

}

但是这不起作用，因为在渲染阶段，它无法将String转换为我的Object List.我该怎么办..?

But this is not working, because in the render phase, it can't convert the String to my Object List. How could I do this..?

起初，我在类级别使用私有List mylist，但据我所知，控制器是单例模式，因此我们不能使用这种方法.

At first, I was using a private List mylist at class level, but as far as I know, a controller is a singleton pattern, so we can't use this approach.

推荐答案

将ActionRequest请求对象添加到您的方法签名中，如下所示，并将对象添加为属性

Add ActionRequest request object into your method signature like as following and add objects as attribute

@ActionMapping(params = "doAction=searchDeviceResults")
public void searchResults(@ModelAttribute(value = "searchForm") SearchForm searchForm,
                          BindingResult bindingResult, 
                          ActionRequest request, 
                          ActionResponse response, 
                          SessionStatus sessionStatus) {

    searchFormValidator.validate(searchForm, bindingResult);

    if (!bindingResult.hasErrors()) {
        response.setRenderParameter("doAction", "showDeviceResults");
        sessionStatus.setComplete();    
        List<AccountDetail> accList = accountService.getAccountDetail(adp);
        request.setAttribute("accountList", accList); // here we go
    }

}

另一个重要的事情是在 portlet.xml 中添加以下配置标签，因此无需获取并再次放入render方法，您的请求属性就可以在 JSP 上使用. /p>

Another important thing is to add below config tags in portlet.xml so without getting and putting again into render method your request attribute will be available on the JSP.

<container-runtime-option>
    <name>javax.portlet.actionScopedRequestAttributes</name>
    <value>true</value>
</container-runtime-option>
<container-runtime-option>
    <name>javax.portlet.renderHeaders</name>
    <value>true</value>
</container-runtime-option>
<container-runtime-option>
    <name>javax.portlet.escapeXml</name>
    <value>false</value>
</container-runtime-option>

让我知道是否发生任何问题.

Let me know if any issue occurs.

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