src/org/bs/servlet/backend/LoginServlet.java

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package org.bs.servlet.backend;

import java.io.IOException;

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

import org.bs.dao.impl.UserDaoImpl;
import org.bs.model.User;

public class LoginServlet extends HttpServlet {

	private boolean isSupportCheckCode = false;

	@Override
	public void init(ServletConfig config) throws ServletException {
		isSupportCheckCode = config.getServletContext()
				.getInitParameter("isSupportCheckCode").equals("1") ? true
				: false;
	}

	@Override
	protected void service(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String method = request.getParameter("method");
		if (method == null || method.equalsIgnoreCase("login")) {
			login(request, response);
		} else if (method.equalsIgnoreCase("loginOut")) {
			loginOut(request, response);
		}
	}

	protected void loginOut(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.getSession().invalidate();
		response.sendRedirect(request.getContextPath() + "/backend/login.jsp");
	}

	protected void login(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		String key = request.getParameter("key");
		String code = request.getParameter("code");
		String check_code = (String) request.getSession().getAttribute(
				"check_code");
		UserDaoImpl userDao = new UserDaoImpl();
		User user = null;
		if (isSupportCheckCode) {
			if (!code.equalsIgnoreCase(check_code)) {
				request.getSession().setAttribute("login_error", "验证码输入有误");
				response.sendRedirect(request.getContextPath()
						+ "/backend/login.jsp");
				return;
			}
		}
		try {