我正在为 portlet 使用 spring MVC,我发现了一个问题。
我需要将对象列表从操作阶段传递到渲染阶段。我试过使用 setRenderParameter,像这样:
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;
}
但这不起作用,因为在渲染阶段,它无法将字符串转换为我的对象列表。我怎么能这样做……?
起初,我在类级别使用私有(private)列表 mylist,但据我所知, Controller 是单例模式,因此我们不能使用这种方法。
最佳答案
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
@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
}
}
另一件重要的事情是在 portlet.xml 中添加以下配置标签,这样无需获取并再次放入渲染方法,您的请求属性将在 JSP 上可用。
<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>
如果出现任何问题,请告诉我。
关于java - 将对象列表从 Action 传递到渲染阶段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13416157/