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Liferay7 BPM门户开发之40: Form表单的Action到Render的数据传递

在Form提交后的变量,很多情况是要展现在jsp页面中,这时Action到Render的变量传递就非常有用。

例如,您在数据库中添加了学生的详细信息。

为了实现这一需求,先创建Form表单(学生的细节,如姓名、出生日期等,通过action url来实现)。

当用户提交表单时,这些数据(学生信息)会在你执行CRUD操作的action方法添加。

添加完成后,需要把一些信息展现到jsp页面。

 

和v6.2不同的是,action方法里不需要写类似这样的语句:

actionResponse.setRenderParameter("XXX", 变量名);
actionRequest.setAttribute("XXX", 变量名);

举例说明

在Action阶段,我们提交了name变量,然后需要在Render阶段展现在JSP

Java代码

package com.lifiti.portlet;import com.liferay.portal.kernel.log.Log;import com.liferay.portal.kernel.log.LogFactoryUtil;import com.liferay.portal.kernel.portlet.bridges.mvc.MVCPortlet;import com.liferay.portal.kernel.util.ParamUtil;import java.io.IOException;import javax.portlet.ActionRequest;import javax.portlet.ActionResponse;import javax.portlet.Portlet;import javax.portlet.PortletException;import javax.portlet.ProcessAction;import javax.portlet.RenderRequest;import javax.portlet.RenderResponse;import org.osgi.service.component.annotations.Component;@Component(immediate = true, property = { "com.liferay.portlet.display-category=category.sample",        "com.liferay.portlet.instanceable=true", "javax.portlet.requires-namespaced-parameters=false",        "javax.portlet.display-name=com.lifiti.parts Portlet", "javax.portlet.init-param.template-path=/",        "javax.portlet.init-param.view-template=/view.jsp", "javax.portlet.resource-bundle=content.Language",        "javax.portlet.security-role-ref=power-user,user" }, service = Portlet.class)public class FirstPortlet extends MVCPortlet {    private static final Log _log = LogFactoryUtil.getLog(FirstPortlet.class.getName());    @Override    public void render(RenderRequest request, RenderResponse response) throws PortletException, IOException {        String peopleName = ParamUtil.get(request, "name", "");        String age = ParamUtil.get(request, "age", "");        _log.info("peopleName by ParamUtil in render ==>" + peopleName);        _log.info("age by ParamUtil in render ==>" + age);        _log.info("age By RenderParameter in render ==>" + request.getAttribute("ageBySetParameter"));                request.setAttribute("peopleName", peopleName);        super.render(request, response);    }    @ProcessAction(name = "send")    public void ReceiveData(ActionRequest actionRequest, ActionResponse actionResponse) throws Exception {        String name = ParamUtil.getString(actionRequest, "name");        String age = ParamUtil.getString(actionRequest, "age");        String phone = ParamUtil.getString(actionRequest, "phone");                actionRequest.setAttribute("phone", phone);        actionResponse.setRenderParameter("ageBySetParameter", age);                _log.info(" 开始接收数据");        System.out.println("FirstPortlet.java  name = " + name);        System.out.println("FirstPortlet.java  age = " + age);        System.out.println("FirstPortlet.java  phone = " + phone);    }}

 

jsp

<%@page import="com.liferay.portal.kernel.portlet.LiferayPortletMode"%><%@page import="com.liferay.portal.kernel.portlet.LiferayWindowState"%><%@ include file="/init.jsp" %><p>    <b><liferay-ui:message key="com_lifiti_parts_ComLifitiPartsmvcportlet.caption"/></b></p><c:set var="submit"><liferay-ui:message key="com_lifiti_parts_ComLifitiPartsmvcportlet.submit"/></c:set><c:if test="${not empty phone }">    Phone: ${phone} added successfully.</c:if>    <c:if test="${not empty peopleName }">    PeopleName: ${peopleName} added successfully.</c:if>    <portlet:actionURL var="sendURL" name="send">  </portlet:actionURL>    <form action="${sendURL}" method="post" name="fm">      <aui:input name="name" label="Name" id="name"/>     <aui:input name="age" label="Age" id="age"/>     <input type="text" name="<portlet:namespace/>phone" />       <input type="submit" value="${submit}"></input>  </form>  

 

log:

FirstPortlet.java name = 王昕
FirstPortlet.java age = 1
FirstPortlet.java phone = 123
16:16:59,946 INFO [http-nio-8080-exec-7][FirstPortlet:32] peopleName by ParamUtil in render ==>王昕
16:16:59,947 INFO [http-nio-8080-exec-7][FirstPortlet:33] age by ParamUtil in render ==>1
16:16:59,947 INFO [http-nio-8080-exec-7][FirstPortlet:34] age By RenderParameter in render ==>null

可以看到RenderParameter没有效果,所以v7.0中这种语句可以不用写:

actionRequest.setAttribute("phone", phone);
actionResponse.setRenderParameter("ageBySetParameter", age);

实际上,只需要2句就能完成数值传递:

String peopleName = ParamUtil.get(request, "name", "");
request.setAttribute("peopleName", peopleName);

感觉很方便

Liferay7 BPM门户开发之40: Form表单的Action到Render的数据传递