loginservlet.java

学习 java 做 的一些 小 试验。。。。。。。可以

package com.wczy.servlet;

import com.wczy.dao.UsersDao;
import com.wczy.daoimpl.UsersDaoImpl;
import com.wczy.pojo.*;

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

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

public class LoginServlet extends HttpServlet {

	public LoginServlet() {
		super();
	}

	public void destroy() {
		super.destroy();
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		doPost(request, response);

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setCharacterEncoding("GBK");
		request.setCharacterEncoding("GBK");
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		Users users = (Users) request.getAttribute("user1");
		UsersDao usersdaoimpl = new UsersDaoImpl();
		Users username = usersdaoimpl.getUsername(users.getUsername());
		String error = null;
		String url;
		if (username == null) {
			error = "username" + users.getUsername() + "不存在";
			url = "/index.jsp";
		} else {
			if (username.getPassword().equals(users.getPassword())) {
				url = "/success3.jsp";
				HttpSession session = request.getSession();
				username.setLogin(true);
				session.setAttribute("users", username);
			} else {
				error = "失败";
				url = "/index.jsp";
			}
		}
		if (error != null) {
			request.setAttribute("error", error);
		}
		RequestDispatcher rd = getServletContext().getRequestDispatcher(url);
		rd.forward(request, response);

	}

	public void init() throws ServletException {
	}

}