将struts项目转化为一个portlet-优快云博客

本文介绍如何将基于Struts的Web应用转换为portlet，以便整合到更大项目中。主要步骤包括创建portlet.xml和struts-portlet-config.xml配置文件、调整struts-config.xml设置、编写PortalServletContextProvider类以及修改JSP页面。

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以前用struts做了一个项目，现在需要将其转化为一个portlet，嵌入到另一个更大的项目中，使其成为其中的一部分，于是上网查了些资料，终于弄好了，在此记录一下。

1. 在struts项目的WebRoot\WEB-INF下面新建portlet.xml文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<portlet-app  
	xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"
  version="1.0">
  
    <portlet>    	
    	<description>Web Fits files Header Archiving System</description>
    	<portlet-name>webFithas</portlet-name>
        <display-name>webFithas Portlet</display-name>        
        <portlet-class>org.apache.portals.bridges.struts.StrutsPortlet</portlet-class>       
        <init-param>
            <name>ServletContextProvider</name>
            <value>org.cvo.fithas.struts.util.PortalServletContextProvider</value>
        </init-param>
        <init-param>
            <name>ViewPage</name>
            <value>/index.jsp</value>
        </init-param>      
        <expiration-cache>-1</expiration-cache>
        <supports>
            <mime-type>text/html</mime-type>
            <portlet-mode>VIEW</portlet-mode>
        </supports>
        <portlet-info>
            <title>webFithas</title>
            <short-title>webFithas</short-title>
            <keywords>webFithas</keywords>
        </portlet-info>
    </portlet>

</portlet-app>

2. 在struts项目的WebRoot\WEB-INF下面新建一个struts-portlet-config.xml文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
   
   <config>
     <render-context>
       <attribute name="errors"/>
       <attribute name="message" keep="true"/>
     </render-context>
     
     <portlet-url-type>
	     <action path="/index"/>
	     <action path="/filter"/>
	     <action path="/tableCreationStrategy"/>
	     <action path="/dbConfiguration"/>
	     <action path="/tableDescription"/>
	     <action path="/tableCreation"/>
	     <action path="/archiveStrategy"/>
	     <action path="/result"/>
    </portlet-url-type>
  </config>

3. 修改struts项目的WebRoot\WEB-INF下面的struts-config.xmll文件，在<message-resources />前面添加如下内容：

<controller pagePattern="$M$P"  
        processorClass="org.apache.portals.bridges.struts.PortletRequestProcessor"/>

4. 修改struts项目的WebRoot\WEB-INF下面的struts-config.xmll文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.portals.bridges.struts.PortletServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>2</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <servlet>
  	<servlet-name>webFithas</servlet-name>
  	<display-name>webFithas portlet</display-name>
  	<description>webFithas Portlet</description>
  	<servlet-class>org.apache.pluto.core.PortletServlet</servlet-class>
  	<init-param>
  		<param-name>portlet-class</param-name>
  		<param-value>org.apache.portals.bridges.struts.StrutsPortlet</param-value>
  	</init-param>
  	<init-param>
			<param-name>portlet-name</param-name>
			<param-value>webFithas</param-value>
	</init-param>
  	 <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>webFithas</servlet-name>
    <url-pattern>/PlutoInvoker/webFithas/*</url-pattern>
  </servlet-mapping>


  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

5. 新建PortalServletContextProvider.java文件，内容如下：

package org.cvo.fithas.struts.util;

import javax.portlet.GenericPortlet;
import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import org.apache.pluto.internal.impl.PortletContextImpl;
import org.apache.portals.bridges.common.ServletContextProvider;

public class PortalServletContextProvider implements ServletContextProvider 
{
    public ServletContext getServletContext(GenericPortlet portlet)
    {   	
        return ((PortletContextImpl) portlet.getPortletContext()).getServletContext();
    }

   public HttpServletRequest getHttpServletRequest(GenericPortlet portlet, PortletRequest request)
   {
       return (HttpServletRequest) ((HttpServletRequestWrapper) request).getRequest();         
   }

   public HttpServletResponse getHttpServletResponse(GenericPortlet portlet, PortletResponse response) 
   {
       return (HttpServletResponse) ((HttpServletResponseWrapper) response).getResponse();           
   }
}

6. 修改所有的jsp页面，将

<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>

对应的改为

<%@ taglib uri="http://portals.apache.org/bridges/struts/tags-portlet-html" prefix="html" %>

其他标签也是类似的改法。

经过以上步骤，就可以成功的把一个struts项目转化为一个portlet了。