loginservlet.java

jsp + servlete + jdbc开的管理系统

package hbu.david.cmc.servlet;

import java.io.IOException;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.RequestDispatcher;
import java.io.*;

import hbu.david.cmc.http.*;
import hbu.david.cmc.bean.*;
import hbu.david.cmc.work.*;
/**
 * Servlet implementation class for Servlet: LoginServlet
 *
 */
 public class LoginServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
   static final long serialVersionUID = 1L;
   
    /* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#HttpServlet()
	 */
	public LoginServlet() {
		super();
	}   	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request,response);
	}  	
	
	/* (non-Java-doc)
	 * @see javax.servlet.http.HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		ServletEncoding.setEncoding(request, response);
		UserInfo userInfo=new UserInfo();
		userInfo.setUsername(request.getParameter("username"));
		userInfo.setPassword(request.getParameter("password"));
		userInfo=new UserBean().Login(userInfo);
		HttpSession session=request.getSession();
		RequestDispatcher requestDispatcher=null;
		//response.getWriter().print(request.getQueryString());
		
		if(userInfo==null){
			//设置返回路径和错误信息
			request.setAttribute("returnUrl", "login.jsp");
			request.setAttribute("errorMessage", "帐号或者密码不正确！");
			requestDispatcher=request.getRequestDispatcher("error.jsp");
			//ServletContext sc=this.getServletContext().setAttribute(", arg1)
			response.getWriter().print(request.getRequestURI());
		}else{
			session.setAttribute("userInfo", userInfo);
			requestDispatcher=request.getRequestDispatcher("GetDefaultInfo?userId="+userInfo.getId());
			
		}
		requestDispatcher.forward(request, response);
	}   	  	    
}