JavaWeb项目-宠物诊所管理系统

package 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 javax.servlet.http.HttpSession; import dao.LoginDao; //@SuppressWarnings("serial") public class LoginServlet extends HttpServlet{ //此方法响应 get 方式的请求：如 表单中method的值为get，或使用超链接发出请求 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req,resp); } //此方法响应 post 方式的请求： 如 表单中method的值为post protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //取表单参数 String login_name = req.getParameter("username"); String password = req.getParameter("password"); LoginDao dao = new LoginDao(); //调LoginDao的checkLoginUser()检查账户名、密码是否存在 boolean flag = dao.checkLoginUser(login_name, password); if(flag){//若存在，则转向内容页main.jsp，同时在session范围打上登陆成功的标志 HttpSession session = req.getSession(); session.setAttribute("login","ok"); resp.sendRedirect("pages/vetsearch.jsp");//网页重定向（客户端跳转）p141 }else{ //若不存在，则给出提示，并转至登陆页 //先设客户端浏览器的编码方式，再用out对象向浏览器输出内容，否则会出现中文乱码 resp.setContentType("text/html;charset=utf-8"); PrintWriter out = resp.getWriter(); out.println("账户名或密码错误，请重新登陆！"); resp.setHeader("refresh","2;url=index.jsp");//(网页重定向) } } //此方法在servlet销毁时被调用 public void destroy() { // TODO Auto-generated method stub super.destroy(); } //此方法在servlet初始化时被调用 public void init() throws ServletException { // TODO Auto-generated method stub super.init(); } }