adddvdservlet.java

使用Servlet和JSP进行Web组件开发

/*
 * AddDVDServlet.java
 *
 * 
 */

package com.dvd.controller;

import com.dvd.model.DVDItem;
import java.io.*;
//import java.net.*;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 *
 * @author 
 * @version
 */
public class AddDVDServlet extends HttpServlet {
    public void doPost(HttpServletRequest request,
            HttpServletResponse response)
            throws IOException, ServletException {
        
        try {
            
            // Retrieve form parameters
            String title = request.getParameter("title");
            String year = request.getParameter("year");
            // Did the user type in a genre?
            String genre = request.getParameter("newGenre");
            // If not, use the drop-down list value
            if ( (genre == null) || (genre.trim().length() == 0) ) {
                genre = request.getParameter("genre");
            }
            
            // Business logic
            DVDItem item = new DVDItem(title, year, genre);
            
            // Store the item on the request-scope
            request.setAttribute("dvdItem", item);
            
            // Dispatch to Success view
            RequestDispatcher view = request.getRequestDispatcher("/success.view");
            view.forward(request, response);
            
            // Handle any unexpected expections
        } catch (RuntimeException e) {
            PrintWriter out = response.getWriter();
            out.println("ERROR: " + e.getMessage());
            out.close();
        }
    }
}