userservlet.java

简单的流言板系统,用myeclipse进行编写的,采用简单的jstl+javabean+servlet+jsp,属于三层架构.

package me.work.servlets;

import java.io.IOException;

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

import me.work.services.DBOperation;

public class UserServlet extends HttpServlet {

	/**
	 * serialVersionUID
	 */
	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {

		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// get the method to see what the user is to do
		String method = req.getParameter("method");
		// user logout
		if ("logout".equals(method)) {
			req.getSession().removeAttribute("userName");
			req.getRequestDispatcher("./pages/index.jsp").forward(req, resp);
			return;
		}
		// check user's session
		HttpSession session = req.getSession();
		if (session.getAttribute("userName") == null) {
			req.getRequestDispatcher("./pages/index.jsp").forward(req, resp);
			return;
		}
		if ("newm".equals(method)) {
			// do add new message
			req.getRequestDispatcher("./pages/addNew.jsp").forward(req, resp);
			return;

		}
		if ("mmm".equals(method)) {
			// manage my message
			DBOperation dbo = new DBOperation();
			try {
				//set msglist to the request attribute
				req.setAttribute("msgList", dbo.getMsgList(req.getSession()
						.getAttribute("userName").toString()));
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
            req.setAttribute("see", "yes");
			req.getRequestDispatcher("./pages/manageMsg.jsp")
					.forward(req, resp);
			return;

		}
		
	}

}