http://jakarta.apache.org/commons/digester/ [功能] 读取 xml 资料 [下载与安装] 使用版本 Digester 1.8 相依 component Logging 1.1.x BeanUtils 1.x Collections (2.x/3.x) 安装方式: 同一般的 classpath 设定方式 Smile [一些基本概念] 1. xpath 相似的 pattern 观 即以 xml root element 与其 child element 简单的以 root/child_A/child_B 去 match 到所需的 element 2. 以 java bean 去做 java object-xml mapping 以 yahoo 即时新闻的 rss feed 为例， http://tw.news.yahoo.com/rss/realtime 我们可以将他视为是一个 News 类别， News 类别中含有很多个 Item 类别实体，每个 Item 就是新闻短讯。 ======================================================================= [刻 data object] import java.util.Vector; /** * News store all the news item * * @author qrtt1 * */ public class News { // use vector hold items private Vector<Item> items; public News() { items = new Vector<Item>(); } /** * @param i * add a new item */ public void addItem(Item i) { items.add(i); } /** * @return all the items */ public Vector<Item> getItems() { return items; } } /** * Item class hold a news entry * * @author qrtt1 * */ public class Item { private String title; private String link; /** * @return item's link */ public String getLink() { return this.link; } /** * @param link * item's link */ public void setLink(String link) { this.link = link; } /** * @return item's title */ public String getTitle() { return this.title; } /** * @param title * item's title */ public void setTitle(String title) { this.title = title; } /* * @see java.lang.Object#toString() */ public String toString() { return "Item [title=" + title + ",link=" + link + "]"; } } 写完了基本的 data object 後，接下来我们要来处理 digester 了 你会发现和 dom 或相类的 parser 用法完全不同的感觉 =============================================================== import java.io.IOException; import java.util.Iterator; import java.util.Vector; import org.apache.commons.digester.Digester; import org.xml.sax.SAXException; /** * Digester Test Application, this sample code demo how to use Digester * * @author qrtt1 * */ public class DigesterTest { public static void main(String[] args) throws IOException, SAXException { // get an instance for digester Digester digester = new Digester(); // create News bean while the "rss/channel" xpath pattern match digester.addObjectCreate("rss/channel", News.class); // create Item bean while the "rss/channel/item" xpath pattern match digester.addObjectCreate("rss/channel/item", Item.class); // use the bean setter method digester.addBeanPropertySetter("rss/channel/item/title", "title"); digester.addBeanPropertySetter("rss/channel/item/link", "link"); // if the pattern "rss/channel/item" match aply the next rule digester.addSetNext("rss/channel/item", "addItem"); // parse the xml News n = (News) digester.parse("http://tw.news.yahoo.com/rss/realtime"); // show the result Vector<Item> v = n.getItems(); Iterator it = v.iterator(); while (it.hasNext()) { System.out.println(it.next()); } } } ===================================================================== 好呗，其实你会发现其中的奥妙。只写了 2 个 java bean 和一个主程式 你要的资料都读进来了。 <% Item [title=卡崔娜飓风幸存胚胎诞生 (民视 ),link=http://tw.rd.yahoo.com/referurl/news/rss/realtime/*http://tw.news.yahoo.com/article/url/d/a/070117/11/9grl.html] Item [title=2011世大运 中国深圳主办 (民视 ),link=http://tw.rd.yahoo.com/referurl/news/rss/realtime/*http://tw.news.yahoo.com/article/url/d/a/070117/11/9grk.html] I .................................. %> [参考资料] Learning and Using Jakarta Digester http://www.onjava.com/pub/a/onjava/2002/10/23/digester.html Simplify XML file processing with the Jakarta Commons Digester http://www.javaworld.com/javaworld/jw-10-2002/ jw-1025-opensourceprofile_p.html -- web 版: http://www.javaworld.com.tw/jute/post/view?bid=11&id=180873&sty=1&tpg=1&age=0 -- ※ Origin: SayYA 资讯站 <bbs.sayya.org> ◆ From: 163.26.34.247