使用RAD7.5开发Portlet的例子
发布时间：2011-02-16 17:27:46
所有的portlet类理论上讲都应该implements Portlet这个interface，但是实际开发中一般是继承GenericPortlet这个类，这个类是Portlet这个接口的一般实现，而且这个类在jsr286规范中实现了Portlet, PortletConfig, EventPortlet, ResourceServingPortlet这几个接口。
Portlet 开发一定要明白portlet运行机制， portlet中jsp的请求分为两种：renderRequest和actionRequest ，其中 actionRequest 触发的是portlet 类中的processAction() method,在经过这个方法处理之后 portlet容器 会触发这个页面上所有portlet的Render（）method，而 render（）这个method 会去调用doDispatch（）method来分发请求到 doview（），从而把要显示的页面显示出来；如果一个request是 renderRequest的时候 这时候portlet容器会掉用 这个页面上的所有的portlet的Render（）method来刷新显示所有portlet。
，其中doDispatch这个method是用来转发请求的。
好了下面来看具体的开发细节：
1.打开 rad7.5，建立一个portlet项目名字叫 newEventxx，选择api类型为 jsr286，portlet类型为基本portlet，其他默认，点击下一步，。。完成。
2.在newEventxx项目上点右键==〉新建==〉portlet ，添加第二个portlet到项目中，
这时候系统给我们建立了四个文件:
分别叫NewEventxxPortlet.Java.。。。。等等
这四个文件中 NewEventxxPortlet.Java和 NewEventxx2Portlet.Javaf分别是第一个portlet和第二个portlet的请求处理类，另外两个java文件为该portlet对应的传递数据的bean。
3.把 NewEventxxPortletSessionBean作为信息传递类，其中信息传递类需要 实现Serializable这个接口，故在第三步把这个bean 改写成为实现Serializable这个接口
以上为 这个bean的源代码
4.配置 portlet。Xml文件
Portlet。Xml的格式现在应该为：
<portlet-app>
NewEventxxPortlet定义信息
NewEventxx2Portlet定义信息
portlet-app>
添加Event定义 ,event发布,event接受处理后的xml文件应该为：
<portlet-app>
（NewEventxxPortlet定义信息）
（NewEventxx2Portlet定义信息）
portlet-app>
5.改写newEventxxPortlet。Java添加信息发布操作和改写newEventxx2Portlet.java 添加事件处理方法。
package com.ibm.neweventxx;
import java.io.*;
import java.util.*;
import javax.portlet.*;
/**
* A sample portlet based on GenericPortlet
*/
public class NewEventxxPortlet extends GenericPortlet {
public static final String JSP_FOLDER = "/_newEventxx/jsp/"; // JSP folder name
public static final String VIEW_JSP = "NewEventxxPortletView"; // JSP file name to be rendered on the view mode
public static final String SESSION_BEAN = "NewEventxxPortletSessionBean"; // Bean name for the portlet session
public static final String FORM_SUBMIT = "NewEventxxPortletFormSubmit"; // Action name for submit form
public static final String FORM_TEXT = "NewEventxxPortletFormText"; // Parameter name for the text input
/**
* @see javax.portlet.Portlet#init()
*/
public void init() throws PortletException{
super.init();
}
/**
* Serve up the view mode.
*
* @see javax.portlet.GenericPortlet#doView(javax.portlet.RenderRequest, javax.portlet.RenderResponse)
*/
public void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException {
// Set the MIME type for the render response
response.setContentType(request.getResponseContentType());
// Check if portlet session exists
NewEventxxPortletSessionBean sessionBean = getSessionBean(request);
if( sessionBean==null ) {
response.getWriter().println("NO PORTLET SESSION YET");
return;
}
// Invoke the JSP to render
PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher(getJspFilePath(request, VIEW_JSP));
rd.include(request,response);
}
/**
* Process an action request.
*
* @see javax.portlet.Portlet#processAction(javax.portlet.ActionRequest, javax.portlet.ActionResponse)
*/
public void processAction(ActionRequest request, ActionResponse response) throws PortletException, java.io.IOException {
if( request.getParameter(FORM_SUBMIT) != null ) {
// Set form text in the session bean
NewEventxxPortletSessionBean sessionBean = getSessionBean(request);
if( sessionBean != null )
sessionBean.setFormText(request.getParameter(FORM_TEXT));
response.setEvent("name",sessionBean );
}
}
/**
* Get SessionBean.
*
* @param request PortletRequest
* @return NewEventxxPortletSessionBean
*/
private static NewEventxxPortletSessionBean getSessionBean(PortletRequest request) {
PortletSession session = request.getPortletSession();
if( session == null )
return null;
NewEventxxPortletSessionBean sessionBean = (NewEventxxPortletSessionBean)session.getAttribute(SESSION_BEAN);
if( sessionBean == null ) {
sessionBean = new NewEventxxPortletSessionBean();
session.setAttribute(SESSION_BEAN,sessionBean);
}
return sessionBean;
}
/**
* Returns JSP file path.
*
* @param request Render request
* @param jspFile JSP file name
* @return JSP file path
*/
private static String getJspFilePath(RenderRequest request, String jspFile) {
String markup = request.getProperty("wps.markup");
if( markup == null )
markup = getMarkup(request.getResponseContentType());
return JSP_FOLDER + markup + "/" + jspFile + "." + getJspExtension(markup);
}
/**
* Convert MIME type to markup name.
*
* @param contentType MIME type
* @return Markup name
*/
private static String getMarkup(String contentType) {
if( "text/vnd.wap.wml".equals(contentType) )
return "wml";
else
return "html";
}
/**
* Returns the file extension for the JSP file
*
* @param markupName Markup name
* @return JSP extension
*/
private static String getJspExtension(String markupName) {
return "jsp";
}
}
======================================================================package com.ibm.neweventxx;
import java.io.*;
import java.util.*;
import javax.portlet.*;
/**
* A sample portlet based on GenericPortlet
*/
public class NewEventxx2Portlet extends GenericPortlet {
public static final String JSP_FOLDER = "/_newEventxx2/jsp/"; // JSP folder name
public static final String VIEW_JSP = "NewEventxx2PortletView"; // JSP file name to be rendered on the view mode
public static final String SESSION_BEAN = "NewEventxx2PortletSessionBean"; // Bean name for the portlet session
public static final String FORM_SUBMIT = "NewEventxx2PortletFormSubmit"; // Action name for submit form
public static final String FORM_TEXT = "NewEventxx2PortletFormText"; // Parameter name for the text input
/**
* @see javax.portlet.Portlet#init()
*/
public void init() throws PortletException{
super.init();
}
/**
* Serve up the view mode.
*
* @see javax.portlet.GenericPortlet#doView(javax.portlet.RenderRequest, javax.portlet.RenderResponse)
*/
public void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException {
// Set the MIME type for the render response
response.setContentType(request.getResponseContentType());
// Check if portlet session exists
NewEventxx2PortletSessionBean sessionBean = getSessionBean(request);
if( sessionBean==null ) {
response.getWriter().println("NO PORTLET SESSION YET");
return;
}
// Invoke the JSP to render
PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher(getJspFilePath(request, VIEW_JSP));
rd.include(request,response);
}
/**
* Process an action request.
*
* @see javax.portlet.Portlet#processAction(javax.portlet.ActionRequest, javax.portlet.ActionResponse)
*/
public void processAction(ActionRequest request, ActionResponse response) throws PortletException, java.io.IOException {
if( request.getParameter(FORM_SUBMIT) != null ) {
// Set form text in the session bean
NewEventxx2PortletSessionBean sessionBean = getSessionBean(request);
if( sessionBean != null )
sessionBean.setFormText(request.getParameter(FORM_TEXT));
}
}
/**
* Get SessionBean.
*
* @param request PortletRequest
* @return NewEventxx2PortletSessionBean
*/
private static NewEventxx2PortletSessionBean getSessionBean(PortletRequest request) {
PortletSession session = request.getPortletSession();
if( session == null )
return null;
NewEventxx2PortletSessionBean sessionBean = (NewEventxx2PortletSessionBean)session.getAttribute(SESSION_BEAN);
if( sessionBean == null ) {
sessionBean = new NewEventxx2PortletSessionBean();
session.setAttribute(SESSION_BEAN,sessionBean);
}
return sessionBean;
}
/**
* Returns JSP file path.
*
* @param request Render request
* @param jspFile JSP file name
* @return JSP file path
*/
private static String getJspFilePath(RenderRequest request, String jspFile) {
String markup = request.getProperty("wps.markup");
if( markup == null )
markup = getMarkup(request.getResponseContentType());
return JSP_FOLDER + markup + "/" + jspFile + "." + getJspExtension(markup);
}
private static String getMarkup(String contentType) {
if( "text/vnd.wap.wml".equals(contentType) )
return "wml";
else
return "html";
}
/**
* Returns the file extension for the JSP file
*
* @param markupName Markup name
* @return JSP extension
*/
private static String getJspExtension(String markupName) {
return "jsp";
}
@ProcessEvent(name="name")
public void processEvent(EventRequest request,EventResponse response){
Event event = request.getEvent();
NewEventxx2PortletSessionBean sessionBean = getSessionBean(request);
if( sessionBean != null )
sessionBean.setFormText(((NewEventxxPortletSessionBean)event.getValue()).getFormText());
}
}
=========================================================
6.发布后添加信息连接
这一步如果不做的话 信息将不能传播。
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