userloginservlet.java

固定资产管理系统包括一个基本的部分

package com.shenlong.assetmanage.control;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
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 com.shenlong.assetmanage.domain.User;
import com.shenlong.assetmanage.service.UserService;


public class UserLoginServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UserLoginServlet() {
		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 {

		 doPost(request,response);
		
	}

	/**
	 * 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 Username =request.getParameter("Username");
		String Password =request.getParameter("Password");
		UserService manage=new UserService();
		User user=null;
		try {
			user = manage.getUser(Username);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		HttpSession session = request.getSession(true);
		
 	   if((user!=null)&&(user.getPassword().equals(Password))){
			
			session.setAttribute("Username",Username);
			session.setAttribute("Password",Password);	
			response.sendRedirect("main.jsp");
	    }
 	  
	  else{
		
		  request.setAttribute("login","error");
		  RequestDispatcher pa=this.getServletContext().getRequestDispatcher("/login.jsp");
		  pa.forward(request, response);
	  }
	}

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

}