Portlet开发入门实例

1原生Portlet开发
这是最简单、最本质的开发方式，直接基于Portlet规范定义的接口开发Portlet。优点是贴近底层比较灵活，缺点当然就是所有事情都要自己去做。就好比不用SpringMVC、Struts，直接基于Servlet开发一样。这种方式比较适合自己开发Portlet框架。
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960public class NativePortlet implements Portlet { private Logger logger = LoggerFactory.getLogger(NativePortlet.class); private PortletConfig config; @Override public void init(PortletConfig portletConfig) throws PortletException { logger.info("初始化Portlet"); this.config = portletConfig; } @Override public void processAction(ActionRequest actionRequest, ActionResponse actionResponse) throws PortletException, IOException { logger.info("处理Action动作"); logger.info("接收到POST请求，用户名为[{}]", actionRequest.getParameter("userName")); } @Override public void render(RenderRequest renderRequest, RenderResponse renderResponse) throws PortletException, IOException { logger.info("处理Render动作"); WindowState state = renderRequest.getWindowState(); if (state.equals(WindowState.MINIMIZED)) { return; } // doDispatch(); PortletMode mode = renderRequest.getPortletMode(); if (PortletMode.VIEW.equals(mode)) { // doView(); String normalPage = config.getInitParameter("ViewPage"); if (WindowState.NORMAL.equals(state)) { this.include(renderRequest, renderResponse, normalPage); } else { this.include(renderRequest, renderResponse, ""); } } else if (PortletMode.EDIT.equals(mode)) { // doEdit(); } else if (PortletMode.HELP.equals(mode)) { // doHelp(); } else { throw new PortletException("unknown portlet mode: " + mode); } } @Override public void destroy() { logger.info("销毁Portlet"); } private void include(RenderRequest request, RenderResponse response, String viewPage) throws PortletException, IOException { response.setContentType("text/html"); PortletContext context = config.getPortletContext(); PortletRequestDispatcher requestDispatcher = context.getRequestDispatcher(viewPage); requestDispatcher.include(request, response); } }
可以看到，在render()方法中，我们要自己处理不同Portlet模式(View,Edit,Help等)的渲染，根据需要做分发。诸如此类的各种细节都需要我们自己去制定规则，自己处理。
2注解Portlet开发
Portlet规范也提供了注解的方式来开发Portlet。这样不用依赖SpringMVC Portlet等第三方框架，也能比较方便的开发Portlet，又不用处理特别底层的实现细节。来看一个例子。
123456789101112131415161718192021222324252627282930313233343536373839404142public class AnnotatedPortlet extends GenericPortlet { private Logger logger = LoggerFactory.getLogger(AnnotatedPortlet.class); /** * 进入主页面(View模式) * @param request * @param response * @throws Exception */ @RenderMode(name = "view") public void toIndexPage(RenderRequest request, RenderResponse response) throws Exception { getPortletContext(). getRequestDispatcher(getInitParameter("ViewPage")). include(request, response); } /** * 保存用户名 * @param request * @param response */ @ProcessAction(name = "saveUsername") public void saveUsername(ActionRequest request, ActionResponse response) { String userName = request.getParameter("userName"); logger.info("保存用户名[{}]", userName); } /** * 保存电子邮件地址 * @param request * @param response */ @ProcessAction(name = "saveEmail") public void saveEmail(ActionRequest request, ActionResponse response) { String email = request.getParameter("email"); logger.info("保存Email[{}]", email); } }
使用@RenderMode注解定义不同模式下，Portlet渲染的实现方法。@ProcessAction注解可以根据动作名称，直接将请求交给标有注解的方法去处理，不用我们自己去实现根据注解分发请求的代码了。
附：其他代码
页面代码如下。使用Portlet规范中定义的标签产生ActionUrl。
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%><%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt"%><%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%><%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet"%><portlet:defineObjects /> <h3>这是一个演示FORM表单和AJAX提交的示例程序</h3> <!-- FORM表单提交实例 --><form action='<portlet:actionURL name="saveUsername"/>' method="POST"> <tr> <td>用户名：</td> <td><input name="userName" type="text" /></td> </tr> <tr> <td><input type="submit" value="表单提交" /></td> </tr></form> <!-- AJAX提交实例 --><tr> <td>Email：</td> <td><input id="email" type="text"/></td></tr><tr> <input id="ajaxBtn" type="button" value="AJAX提交" /></tr><script> $(".ajaxBtn").bind("click", function () { var email = $(".email").valueOf(); jQuery.ajax({ type: "GET", async: true, url: '<portlet:actionURL name="saveEmail" />', dataType: 'json', data: { "email": email }, success: function (data) { alert(data); }, error: function (data, status, e) { alert(e); }, beforeSend: function () { }, complete: function () { } }); });</script>