loginservlet.java

MVC最容易学习的例子

package com.tingsun.mvc.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.tingsun.mvc.dao.LoginDAO;

public class LoginServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//登录处理。。。。
	//	System.out.println("登录");
		request.setCharacterEncoding("GBK");
		response.setCharacterEncoding("GBK");
		
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		LoginDAO dao = new LoginDAO();
		boolean isLogin = dao.login(username, password);
		if(isLogin){//"admin".equals(username)&&"123".equals(password)
			//重定向
			response.sendRedirect(request.getContextPath()+"/index.jsp");
		}else{
			//重定向
			PrintWriter out =response.getWriter();
			out.println("<script lanuage='javascript'> " +
					"alert('密码错误');" +
					"window.open('./login.jsp','_self')" +
					"</script>");
		//	response.sendRedirect(request.getContextPath()+"/login.jsp");
		}
		
		
		
		
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}