编写Portlet组件A（mvc）

1. 编写后端java业务处理

   public class PortletUrlAPortlet extends MVCPortlet {
   	private Logger log = LoggerFactory.getLogger(PortletUrlAPortlet.class) ;
   	@Override
   	public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
   			throws IOException, PortletException {
   		long uid = PortalUtil.getUserId(renderRequest) ;
   		log.info("PortletUrlAPortlet doView exec --- {}", uid);
   		super.doView(renderRequest, renderResponse);
   	}
   }
   

2. 编写前端jsp页面

   <%@ page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8" %>
   <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
   <%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
   <%@ taglib uri="http://liferay.com/tld/aui" prefix="aui" %><%@
   taglib uri="http://liferay.com/tld/portlet" prefix="liferay-portlet" %><%@
   taglib uri="http://liferay.com/tld/theme" prefix="liferay-theme" %><%@
   taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
   <liferay-theme:defineObjects />
   <portlet:defineObjects />
   <p>
   	<%-- 1.  引入liferay-theme的标签后页面自动存在变量plid --%>
   	<%-- 2. portletName目标Portlet的名称，可以F12打开浏览器查看页面，
   	         元素<span id="p_mvc_ipc_PortalUrlBPortlet"></span>看到，
   	         去掉p_前缀即可 
   	--%>
   	<%-- 3. input的名称不能直接使用 <portlet:namespace/>作为username的前缀，
   	        因为每个portallet的namespace不一样，
   			需要使用组件B的namespace值，可打印到页面上显示出来，然后粘贴到这里
   	--%>
   	<liferay-portlet:renderURL var="updateUrl" plid="<%=plid %>" portletName="mvc_ipc_PortalUrlBPortlet">
   	 	<liferay-portlet:param name="password" value="123"/>
   	</liferay-portlet:renderURL>
   	<form method ="post" action ="${updateUrl}">
   		用户名：<input type ="text" name ="_mvc_ipc_PortalUrlBPortlet_username" value ="yicj"/>
   		<input type ="submit" value ="提交" />
   	</form>
   </p>
   

编写Portlet组件B （mvc）

1. 编写后端java业务处理

   public class PortletUrlBPortlet extends MVCPortlet {
   	private Logger log = LoggerFactory.getLogger(PortletUrlAPortlet.class) ;
   	@Override
   	public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
   			throws IOException, PortletException {
   		long uid = PortalUtil.getUserId(renderRequest) ;
   		// 1. 组件A提交过来的用户名
   		String username = ParamUtil.getString(renderRequest, "username") ;
   		String password = ParamUtil.getString(renderRequest, "password") ;
   		log.info("PortletUrlBPortlet doView exec ---uid: {} , username: {}, password: {}", uid, username, password);
   		// 2. 将数据放入request以备前端显示
   		renderRequest.setAttribute("username", username);
   		renderRequest.setAttribute("password", password);
   		super.doView(renderRequest, renderResponse);
   	}
   }
   

2. 编写前端jsp代码片段

   <p>
   	<b><liferay-ui:message key="portalUrlB.caption"/></b><br/>
   	username : ${username } <br/>
   	password : ${password }<br/>
   </p>