JSR286portlet中使用Ajax的方法

JSR286portlet支持Ajax

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>

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("=========================");

    }

}

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>

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

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？

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JSR286portlet中使用Ajax的方法

JSR286portlet支持Ajax

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