dispatchservlet.java

贯穿案例JSP+JavaBean+Servlet网上订餐系统.希望大家下载下来研究

package com.restrant.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.restrant.util.ServletFinder;
import com.restrant.util.StringUtil;

public class DispatchServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DispatchServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		ServletContext sct=getServletContext();
		String realpath=sct.getRealPath("/");
		ServletConfig config=this.getServletConfig();
		String myStrutsCfgFile=config.getInitParameter("configFile");
		String cfgFile=realpath+myStrutsCfgFile;
		String reqUri=request.getRequestURI();
		String patternStr;
		if(reqUri.contains("?")){
			patternStr=StringUtil.getMatchedString("([.])(.*)?", reqUri);
		}else{
			patternStr = StringUtil.getMatchedString("([.])(.*)$", reqUri);
		}
		String servletName = StringUtil.getMatchedString("/(.*)/(.*)[.]"+patternStr,reqUri);
		ServletFinder finder = new ServletFinder(cfgFile,servletName);
		String servletClass = finder.getServletclas();
		try {
			Class cls = Class.forName(servletClass);
			HttpServlet servlet = (HttpServlet)cls.newInstance();
			servlet.service(request, response);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}