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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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原文地址：https://www.cnblogs.com/nimeiz/p/3427416.html