nodeservlet.java

精通Jboss——Ejb和Web Services开发精解的随书源代码

/*
 * Created on 2003-7-22
 */
package com.liuyang.ejb.cmp.node.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.liuyang.ejb.cmp.node.NodeLocal;
import com.liuyang.ejb.cmp.node.NodeLocalHome;

/**
 * @author
 * <a href="mailto:[e-mail]">刘洋</a>
 */
public class NodeServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
			processRequest(request,response);		
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
			processRequest(request,response);
	}
	protected void processRequest(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
		System.out.println("node");
		PrintWriter out = response.getWriter();
		Map params = request.getParameterMap();
		try {
			if(!params.containsKey("title")){
				out.println("title and text parameter needed!");
				return;
			}else{
				NodeLocalHome home = (NodeLocalHome) (new InitialContext()).lookup("cmp/nodelocal");						
				String title = request.getParameter("title");
				if(!params.containsKey("text")){
					if(!home.findByTitle(title).isEmpty()){
					NodeLocal node = home.findByPrimaryKey(title);
					out.println("<table><tr ><td>"+title+"</td></tr>"+
								"<tr><td>"+node.getText()+"</td></tr></table>");											
					}else{
						out.println("no this title");
					}
				}else{
					String text = request.getParameter("text");
					if(!home.findByTitle(title).isEmpty()){
						NodeLocal node = home.findByPrimaryKey(title);
						node.remove();
					}	
					home.create(title,text);
					out.println("<table><tr ><td>"+title+"</td></tr>"+
							"<tr><td>"+text+"</td></tr></table>");									
				}
			}					
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}