Tin's Blog

/**
?*?
? */
package ?com.goldnet.framework.webwork.result;

import ?java.io.Writer;

import ?org.apache.log4j.Logger;

import ?com.opensymphony.webwork.ServletActionContext;
import ?com.opensymphony.xwork.ActionInvocation;
import ?com.opensymphony.xwork.Result;
import ?com.sun.syndication.feed.synd.SyndFeed;
import ?com.sun.syndication.io.SyndFeedOutput;

/**
?*?A?simple?Result?to?output?a?Rome?SyndFeed?object?into?a?newsfeed.
?*? @author ?Philip?Luppens
?*?
? */
public ? class ?RomeResult? implements ?Result?{
? private ? static ? final ? long ?serialVersionUID? = ? - 6089389751322858939L ;

? private ?String?feedName;

? private ?String?feedType;

? private ? final ? static ?Logger?logger? = ?Logger.getLogger(RomeResult. class );

? /*
??*?(non-Javadoc)
??*?
??*?@see?com.opensymphony.xwork.Result#execute(com.opensymphony.xwork.ActionInvocation)
?? */
? public ? void ?execute(ActionInvocation?ai)? throws ?Exception?{
?? if ?(feedName? == ? null )?{
??? // ?ack,?we?need?this?to?find?the?feed?on?the?stack
???logger
?????.error( " Required?parameter?'feedName'?not?found.? "
??????? + ? " Make?sure?you?have?the?param?tag?set?and? "
??????? + ? " the?static-parameters?interceptor?enabled?in?your?interceptor?stack. " );
??? // ?no?point?in?continuing?..
??? return ;
??}

?? // ?don't?forget?to?set?the?content?to?the?correct?mimetype
??ServletActionContext.getResponse().setContentType( " text/xml " );
?? // ?get?the?feed?from?the?stack?that?can?be?found?by?the?feedName
??SyndFeed?feed? = ?(SyndFeed)?ai.getStack().findValue(feedName);

?? if ?(logger.isDebugEnabled())?{
???logger.debug( " Found?object?on?stack?with?name?' " ? + ?feedName? + ? " ':? "
????? + ?feed);
??}
?? if ?(feed? != ? null )?{

??? if ?(feedType? != ? null )?{
???? // ?Accepted?types?are:?rss_0.90?-?rss_2.0?and?atom_0.3
???? // ?There?is?a?bug?though?in?the?rss?2.0?generator?when?it?checks
???? // ?for?the?type?attribute?in?the?description?element.?It's?has?a
???? // ?big?'FIXME'?next?to?it?(v.?0.7beta).
????feed.setFeedType(feedType);
???}
???SyndFeedOutput?output? = ? new ?SyndFeedOutput();
??? // we'll?need?the?writer?since?Rome?doesn't?support?writing?to?an?outputStream?yet
???Writer?out? = ? null ;
??? try ?{
????out? = ?ServletActionContext.getResponse().getWriter();
????output.output(feed,?out);
???}? catch ?(Exception?e)?{
???? // ?Woops,?couldn't?write?the?feed??
????logger.error( " Could?not?write?the?feed " ,?e);
???}? finally ?{
???? // close?the?output?writer?(will?flush?automatically)
???? if ?(out? != ? null )?{
?????out.close();
????}
???}

??}? else ?{
??? // ?woops?..?no?object?found?on?the?stack?with?that?name??
???logger.error( " Did?not?find?object?on?stack?with?name?' " ? + ?feedName
????? + ? " ' " );
??}
?}

? public ? void ?setFeedName(String?feedName)?{
?? this .feedName? = ?feedName;
?}

? public ? void ?setFeedType(String?feedType)?{
?? this .feedType? = ?feedType;
?}

}

< package? name ="default" ?extends ="webwork-default" >
?? < result-types >
??? < result-type? name ="feed" ?class ="com.goldnet.framework.webwork.result.RomeResult" />
?? </ result-types >
?? < interceptors >
?? <!-- ?然后是你的那些inteceptor配置等? -->

/**
?*
? */
package ?com.goldnet.webwork.action.news;

import ?com.opensymphony.xwork.ActionSupport;

import ?com.sun.syndication.feed.synd.SyndCategory;
import ?com.sun.syndication.feed.synd.SyndCategoryImpl;
import ?com.sun.syndication.feed.synd.SyndContent;
import ?com.sun.syndication.feed.synd.SyndContentImpl;
import ?com.sun.syndication.feed.synd.SyndEntry;
import ?com.sun.syndication.feed.synd.SyndEntryImpl;
import ?com.sun.syndication.feed.synd.SyndFeed;
import ?com.sun.syndication.feed.synd.SyndFeedImpl;

import ?org.apache.commons.logging.Log;
import ?org.apache.commons.logging.LogFactory;

import ?java.util.ArrayList;
import ?java.util.Date;
import ?java.util.List;


/**
?*? @author ?Tin
?*
? */
public ? class ?TestFeedCreateAction? extends ?ActionSupport?{
???? private ? static ? final ? long ?serialVersionUID? = ? - 2207516408313865979L ;
???? private ? transient ? final ?Log?log? = ?LogFactory.getLog(TestFeedCreateAction. class );
???? private ? int ?maxEntryNumber? = ? 25 ;
???? private ?String?siteUrl? = ? " http://127.0.0.1 " ;
???? private ?SyndFeed?feed? = ? null ;

???? public ?TestFeedCreateAction()?{
???????? super ();
????}

????@Override
???? public ?String?execute()?{
????????List < News > ?newsList? = ?getNewsList();

???????? if ?(log.isDebugEnabled())?{
????????????log.debug( " Geting?feed!?and?got?news? " ? + ?newsList.size()? +
???????????????? " ?pieces. " );
????????}

????????feed? = ? new ?SyndFeedImpl();

????????feed.setTitle(converttoISO( " 測試中的新聞系統 " ));
????????feed.setDescription(converttoISO( " 測試中的新聞系統：測試Rome?Result " ));
????????feed.setAuthor(converttoISO( " 測試Tin " ));
????????feed.setLink( " http://www.justatest.cn " );

????????List < SyndEntry > ?entries? = ? new ?ArrayList < SyndEntry > ();
????????feed.setEntries(entries);

???????? for ?(News?news?:?newsList)?{
????????????SyndEntry?entry? = ? new ?SyndEntryImpl();
????????????entry.setAuthor(converttoISO(news.getAuthor()));

????????????SyndCategory?cat? = ? new ?SyndCategoryImpl();
????????????cat.setName(converttoISO(news.getCategory()));

????????????List < SyndCategory > ?cats? = ? new ?ArrayList < SyndCategory > ();
????????????cats.add(cat);
????????????entry.setCategories(cats);

????????????SyndContent?content? = ? new ?SyndContentImpl();
????????????content.setValue(converttoISO(news.getContent()));

????????????List < SyndContent > ?contents? = ? new ?ArrayList < SyndContent > ();
????????????contents.add(content);
????????????entry.setContents(contents);
????????????entry.setDescription(content);
????????????entry.setLink(siteUrl? + ? " /common/news/displayNews.action?id= " ? +
????????????????news.getId());
????????????entry.setTitle(converttoISO(news.getTitle()));
????????????entry.setPublishedDate(news.getPublishDate());
????????????entries.add(entry);
????????}

???????? return ?SUCCESS;
????}

???? private ? static ?String?converttoISO(String?s)?{
???????? try ?{
???????????? byte []?abyte0? = ?s.getBytes( " UTF-8 " );

???????????? return ? new ?String(abyte0,? " ISO-8859-1 " );
????????}? catch ?(Exception?exception)?{
???????????? return ?s;
????????}
????}

???? private ?List < News > ?getNewsList()?{
????????List < News > ?newsList? = ? new ?ArrayList < News > ();

???????? for ?( int ?i? = ? 0 ;?i? < ?maxEntryNumber;?i ++ )?{
????????????News?news? = ? new ?News();
????????????news.setTitle( " 測試標題 " ? + ?i);
????????????news.setContent(
???????????????? " <p>測試內容測試內容<span?style=\ " color:red\ " >測試內容</span></p> " );
????????????news.setPublishDate( new ?Date());
????????????news.setId( new ?Long(i));
????????????news.setAuthor( " Tin " );
????????????newsList.add(news);
????????}

???????? return ?newsList;
????}

???? /**
?????*? @return ?Returns?the?maxEntryNumber.
????? */
???? public ? long ?getMaxEntryNumber()?{
???????? return ?maxEntryNumber;
????}

???? /**
?????*? @param ?maxEntryNumber?The?maxEntryNumber?to?set.
????? */
???? public ? void ?setMaxEntryNumber( int ?maxEntryNumber)?{
???????? this .maxEntryNumber? = ?maxEntryNumber;
????}

???? /**
?????*? @param ?siteUrl?The?siteUrl?to?set.
????? */
???? public ? void ?setSiteUrl(String?siteUrl)?{
???????? this .siteUrl? = ?siteUrl;
????}

???? /**
?????*? @return ?Returns?the?feed.
????? */
???? public ?SyndFeed?getFeed()?{
???????? return ?feed;
????}

???? private ? class ?News?{
???????? private ?Long?id;
???????? private ?String?title;
???????? private ?String?content;
???????? private ?Date?publishDate;
???????? private ?String?author;
???????? private ?String?category;

???????? /**
??*?Getter/Setter都省略了，使用了內部類，就是圖個方便
??*?本意是模仿我們常常使用的Pojo，大家的實現都不一樣，我突簡單，里面其實可以有復雜類型的
?? */
????}
}

< package? name ="news" ?extends ="default" ?namespace ="/news" >
?? < action? name ="feed" ?class ="com.goldnet.webwork.action.news.TestFeedCreateAction" >
??? <!-- ?每次生成15條rss?feed? -->
??? < param? name ="maxEntryNumber" > 15 </ param >
??? <!-- ?鏈接的前綴，我們使用Weblogic是7001，也許你的是8080? -->
??? < param? name ="siteUrl" > http://127.0.0.1:7001 </ param >
??? <!-- ?result是feed? -->
??? < result? name ="success" ?type ="feed" >
???? <!-- ?feed名字是feed，對應我們這個Action中的那個SyndFeed的實例的名字feed，別忘記寫getter? -->
???? < param? name ="feedName" > feed </ param >
???? <!-- ?制定生成的feed的類型，我這里選擇rss_2.0? -->
???? <!-- ?rome?0.8支持atom_0.3、atom_1.0、rss_1.0、rss_2.0、rss_0.90、rss_0.91、rss_0.91、rss_0.91U、rss_0.92、rss_0.93、rss_0.94? -->
???? < param? name ="feedType" > rss_2.0 </ param >
??? </ result >
?? </ action >
</ package >