JSR286portlet中使用Ajax的方法

JSR286portlet支持Ajax

1. 一个平常的portlet先，jsr286类型。

   /Train01/WebContent/WEB-INF/portlet.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd"
       version="2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd"
       id="com.ibm.train01.Train01Portlet.17cae2de04">
       <portlet>
           <portlet-name>Train01</portlet-name>
           <display-name xml:lang="zh">Train01</display-name>
           <display-name>Train01</display-name>
           <portlet-class>com.ibm.train01.Train01Portlet</portlet-class>
           <init-param>
               <name>wps.markup</name>
               <value>html</value>
           </init-param>
           <expiration-cache>0</expiration-cache>
           <supports>
               <mime-type>text/html</mime-type>
               <portlet-mode>view</portlet-mode>
           </supports>
           <supported-locale>zh</supported-locale>
           <resource-bundle>com.ibm.train01.nl.Train01PortletResource</resource-bundle>
           <portlet-info>
               <title>Train01</title>
               <short-title>Train01</short-title>
               <keywords>Train01</keywords>
           </portlet-info>
           <portlet-preferences>
               <preference>
                   <name>hehe</name>
                   <value>1</value>
               </preference>
           </portlet-preferences>
       </portlet>
       <default-namespace>http://Train01/</default-namespace>
   </portlet-app>
   

2. 在Portlet java类中加入serveResource(ResourceRequest request, ResourceResponse response)方法

   /Train01/src/com/ibm/train01/Train01Portlet.java

   package com.ibm.train01;
   
   import java.io.*;
   
   import javax.portlet.*;
   
   /**
    * A sample portlet
    */
   public class Train01Portlet extends javax.portlet.GenericPortlet {
       /**
        * @see javax.portlet.Portlet#init()
        */
       public void init() throws PortletException{
           super.init();
       }
   
       /**
        * Serve up the <code>view</code> 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());
           PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher("/WEB-INF/pages/view.jsp");
           rd.include(request,response);
   
           // or write to the response directly
           //response.getWriter().println("Train01#doView()");
       }
   
       /**
        * Serve up the <code>edit</code> mode.
        *
        * @see javax.portlet.GenericPortlet#doEdit(javax.portlet.RenderRequest, javax.portlet.RenderResponse)
        */
       public void doEdit(RenderRequest request, RenderResponse response) throws PortletException, IOException {
           // TODO: auto-generated method stub
       }
   
       /**
        * Serve up the <code>help</code> mode.
        *
        * @see javax.portlet.GenericPortlet#doHelp(javax.portlet.RenderRequest, javax.portlet.RenderResponse)
        */
       protected void doHelp(RenderRequest request, RenderResponse response) throws PortletException, IOException {
           // TODO: auto-generated method stub
       }
   
       /**
        * 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 {
           // TODO: auto-generated method stub
       }
   
       @Override
       public void serveResource(ResourceRequest request, ResourceResponse response)
               throws PortletException, IOException {
           //用printWriter直接输出
           //response.setCharacterEncoding("UTF-8");
           //PrintWriter writer = response.getWriter();
           //writer.print("今天是:"+new Date());
           String s = request.getPreferences().getValue("hehe", null);
           System.out.println(s+"----------------------------------");
           //用dispatcher().include()转发到jsp页面
           getPortletConfig().getPortletContext().getRequestDispatcher("/WEB-INF/pages/resource.jsp").include(request, response);
           System.out.println("=========================");
       }
   
   }
   

3. view模式下的页面

   /Train01/WebContent/WEB-INF/pages/view.jsp

   <%@page language="java"
       contentType="text/html; charset=UTF-8" pageEncoding="utf-8" session="false"%>
   <%--portlet标签的uri是要改成http://java.sun.com/portlet_2_0的，
       这样子的是http://java.sun.com/portle不行的，不能使用下面的<portlet:resourceURL />这个标签的
   --%>
   <%@taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet"%>
   <%@taglib
       uri="http://www.ibm.com/xmlns/prod/websphere/portal/v6.1/portlet-client-model"
       prefix="portlet-client-model"%><portlet-client-model:init>
       <portlet-client-model:require module="ibm.portal.xml.*" />
       <portlet-client-model:require module="ibm.portal.portlet.*" />
   </portlet-client-model:init>
   <portlet:defineObjects />
   <%
       String s = renderRequest.getPreferences().getValue("hehe",null);
   %>
   <%=s %><br />
   <a href="<portlet:resourceURL />">呵呵</a>
   

4. 被resource的页面，可用来处理ajax请求，或者xxx。

   /Train01/WebContent/WEB-INF/pages/resource.jsp

   <%@page language="java"
       contentType="text/html; charset=UTF-8" pageEncoding="utf-8" session="false"%>
   <%@taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet"%>
   <%--听说这个
   <portlet-client-model:init>是不被支持的。所以下面的taglib没什么用。
   对比下view.jsp能看出来。--%>
   <%@taglib
       uri="http://www.ibm.com/xmlns/prod/websphere/portal/v6.1/portlet-client-model"
       prefix="portlet-client-model"%>
   <portlet:defineObjects />
   <%    //可以通过resourceRequest取到Preferences里面的值的。
       String s = resourceRequest.getPreferences().getValue("hehe",null);
       //通过request取到请求过来的参数什么的。
       String queryMail = request.getParameter("queryMail");
       String queryName = request.getParameter("queryName");
   %>
   <%=s %><br />
   dlksfjsdlkfjsdlkfjlkj
   

5. 被resource的也可以是servlet，其实和jsp是一个道理，个人觉得用jsp在修改返回数据的时候会更加方便些。

   • 先定义个servlet

     /Train01/WebContent/WEB-INF/web.xml

     <?xml version="1.0" encoding="UTF-8"?>
     <web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
         <display-name>Train01</display-name>
         <welcome-file-list>
             <welcome-file>index.html</welcome-file>
             <welcome-file>index.htm</welcome-file>
             <welcome-file>index.jsp</welcome-file>
             <welcome-file>default.html</welcome-file>
             <welcome-file>default.htm</welcome-file>
             <welcome-file>default.jsp</welcome-file>
         </welcome-file-list>
         <servlet>
             <servlet-name>MyServlet.do</servlet-name>
             <servlet-class>com.ibm.train01.MyServlet</servlet-class>
         </servlet>
         <servlet-mapping>
             <servlet-name>MyServlet.do</servlet-name>
             <url-pattern>/MyServlet.do</url-pattern>
         </servlet-mapping>
     </web-app>
     

     /Train01/src/com/ibm/train01/MyServlet.java(片段)

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         doPost(request, response);
     }
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         response.setCharacterEncoding("utf-8");
         response.getWriter().write(new Date()+"");
     }
     

   • 然后把portlet类中的serveResource(ResourceRequest request, ResourceResponse response)

     public void serveResource(ResourceRequest request, ResourceResponse response)
             throws PortletException, IOException {
         String s = request.getPreferences().getValue("hehe", null);
         System.out.println(s+"----------------------------------");
         getPortletConfig().getPortletContext().getRequestDispatcher("/MyServlet.do").include(request, response);
         System.out.println("=========================");
     }
     

     方法里Dispatcher的路径改了就okkkk了。然后有个问题是呢。在自己的servlet里面怎么取到Preferences呢？？？
     在serveResource里面request.setAttribute("h","nihao");之后在 servlet里面 用HttpServletRequest类型的request.getAttribute("h")是能拿到值的。为什么呢？