servletfinder.java

一个学习Java反射的例子

package com.struts.servlet;

import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
 * 用于从XML文件找出Servlet的类
 * 
 * @author ljm
 * 
 */
public class ServletFinder {
	private String servletClass;

	private HashMap forwards;

	public ServletFinder(String xmlFile, String servletName) {
		forwards = new HashMap(); // 这句是不能少的
		try {
			File file = new File(xmlFile);
			SAXReader reader = new SAXReader();
			Document document = reader.read(file);
			Element root = document.getRootElement();
			List nodes = root.elements("action");
			for (Iterator it = nodes.iterator(); it.hasNext();) {
				Element servletElm = (Element) it.next();
				if (servletElm.attributeValue("path").equals(servletName)) {
					servletClass = servletElm.attributeValue("class");
					// forward = servletElm.elementText("forward");
					List infos = servletElm.elements("forward");
					System.out.println(infos.size());
					for (Iterator k = infos.iterator(); k.hasNext();) {
						Element forward = (Element) k.next();
						forwards.put(forward.attributeValue("name"), forward
								.attributeValue("path"));
					}
				}
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	public String getServletClass() {
		return servletClass;
	}

	public HashMap getForwards() {
		return forwards;
	}

}