我有一个带有几个 jsp 页面的 portlet,每个页面都包含一个带有提交按钮的表单。当用户在第一个 jsp 上提交表单时,我将数据保存在 db 中并调用 actionResponse.sendRedirect()
将用户转发到下一个 jsp 页面。我必须使用重定向,以防止用户意外地按 F5 在下一页上重新提交相同的数据。一切工作正常,除了重定向到第二页后, doView() 方法未执行,并且我需要在渲染页面之前加载一些数据。这是正常行为还是我做错了什么?在渲染第二个 jsp 之前我可以在哪里加载该数据?
第一个jsp
<%-- ... --%>
<portlet:actionURL name="createNewMyCustomObj" var="createNewMyCustomObjURL" />
<aui:form action="<%= createNewMyCustomObjURL.toString() %> method="post">
<%-- form fields --%>
<aui:button type="submit" value="Create" />
</aui:form>
第二个jsp
<%
MyCustomObj obj = (MyCustomObj) renderRequest.getAttribute("myCustomObj");
%>
<portlet:actionURL name="updateMyCustomObj" var="updateMyCustomObjURL" />
<aui:form action="<%= updateMyCustomObjURL.toString() %> method="post">
<%-- fields with values from myCustomObj --%>
<aui:button type="submit" value="Update" />
</aui:form>
MyMVCPortlet.java
public class MyMVCPortlet extends MVCPortlet {
public createNewMyCustomObj(ActionRequest actionRequest,
ActionResponse actionResponse) throws IOException, PortlalException, SystemException {
PortletURL redirectURL = null;
try {
// get data from request
// save it to db
redirectURL = createRedirectURL(actionRequest, "second.jsp");
} catch(Exception e) {
SessionErrors.add(actionRequest, "error-key")
// errors saving data, stay on the same page
redirectURL = createRedirectURL(actionRequest, "first.jsp");
}
actionResponse.sendRedirect(redirectURL.toString());
}
private PortletURL createRedirectURL(ActionRequest actionRequest, String jspPage) {
ThemeDisplay themeDisplay = (ThemeDisplay) actionRequest.getAttribute(WebKeys.THEME_DISPLAY);
String portletName = (String) actionRequest.getAttribute(WebKeys.PORTLET_ID);
PortletURL redirectURL = PortletURLFactoryUtil.create(
actionRequest, portletName, themeDisplay.getLayout().getPlid(), PortletRequest.RENDER_PHASE);
redirectURL.setParameter("jspPage", jspPage);
return redirectURL;
}
@Override
public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
throws IOException, PortletException {
/*
* doView() is never called after redirecting to second.jsp
*/
if(/* second jsp page */) {
// get myCustomObj created previously
renderRequest.setAttribute("myCustomObj", myCustomObj);
}
super.doView(renderRequest, renderResponse);
}
}
最佳答案
看一下 MVCPortlet 中的 MVCPortlet.doDispatch(RenderRequest renderRequest, RenderResponse renderResponse)
方法 - 在我看来,如果 mvcPath
或 jspPage
参数随请求一起发送,然后 doDispatch
方法完全忽略 doView
方法并直接路由到 JSP 页面。
如果您想在每个 portlet 渲染上运行 doView
方法,那么我建议忽略这些参数并在您的 doView
中自行进行路由。只需在 doView
末尾调用 include(path, renderRequest, renderResponse);
方法,其中 path
参数是您所需的 JSP 页面路径.
根据您编辑的问题,您可能想尝试如下操作:
MyMVCPortlet.java
public class MyMVCPortlet extends MVCPortlet {
//...
private PortletURL createRedirectURL(ActionRequest actionRequest, String jspPage) {
ThemeDisplay themeDisplay = (ThemeDisplay) actionRequest.getAttribute(WebKeys.THEME_DISPLAY);
String portletName = (String) actionRequest.getAttribute(WebKeys.PORTLET_ID);
PortletURL redirectURL = PortletURLFactoryUtil.create(
actionRequest, portletName, themeDisplay.getLayout().getPlid(), PortletRequest.RENDER_PHASE);
redirectURL.setParameter("viewName", jspPage); // note the changed parameter name
return redirectURL;
}
@Override
public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
throws IOException, PortletException {
if(/* ... */) {
// ...
}
String requestedView = renderRequest.getParameter("viewName");
if (StringUtils.isBlank(requestedView)) { // StringUtils comes from commons-lang
include(viewTemplate, renderRequest, renderResponse); // viewTemplate is a protected variable, which may also be called viewJSP depending on Liferay version I think
} else {
include(requestedView, renderRequest, renderResponse);
}
}
}
关于jsp - 重定向后的 Liferay portlet doView(),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25116210/