findbyidservlet.java

新闻发布系统用jsp+javabean+Servlet实现,功能简单,但值得学习.数据库用mysql5.0

package org.langsin.news.control;

import java.io.IOException;

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

import org.langsin.news.data.NewsDataBean;
import org.langsin.news.logic.NewsLogicBean;

public class FindByIdServlet extends HttpServlet {

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

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

	/**
	 * 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 {
		String newsid = request.getParameter("newsid");
		NewsDataBean bean = new NewsLogicBean().findById(newsid);
		if (bean != null) {
			request.setAttribute("bean", bean);
			request.getRequestDispatcher("main/update.jsp").forward(request,
					response);
		} else {
			request.getRequestDispatcher("main/error.jsp").forward(request,
					response);
		}

	}

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

}