编写Portlet组件A

1. 建立mvc类型的Portlet模块
2. 编写后台处理逻辑

   public class PortalSessionAPortlet extends MVCPortlet {
   	@ProcessAction(name ="update")
   	public void update(ActionRequest actionRequest, ActionResponse actionResponse)
   			throws IOException, PortletException {
   		String username = ParamUtil.getString(actionRequest, "username") ;
   		// 注意这里需要设置为APPLICATION_SCOPE，否则取不到
   		actionRequest.getPortletSession().setAttribute("sessionUsername",
   				username, PortletSession.APPLICATION_SCOPE);
   	}
   }
   

3. 编写jsp页面代码片段

   <portlet:actionURL var = "updateUrl" name ="update"/>
   <form method ="post" action ="${updateUrl}">
      用户名：<input type ="text" name ="<portlet:namespace/>username" />
      <input type ="submit" value ="提交" />
   </form>
   

编写Portlet组件B

1. 建立mvc类型的Portlet模块
2. 编写后台处理逻辑

   public class PortalSessionBPortlet extends MVCPortlet {
   	private Logger log = LoggerFactory.getLogger(PortalSessionBPortlet.class) ;
   	@Override
   	public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
   			throws IOException, PortletException {
   		// 取值时也需要使用APPLICATION_SCOPE
   		String sessionUsername = (String)renderRequest.getPortletSession()
   				.getAttribute("sessionUsername", PortletSession.APPLICATION_SCOPE) ;
   		log.info("======> sessionUsername :{}", sessionUsername);
   		super.doView(renderRequest, renderResponse);
   	}
   }
   

3. 编写jsp页面代码片段

   <b>显示A中提交的用户名：${sessionUsername}</b>