jsp+servlet+ajax实现登录

package com.wb.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.wb.entity.User; import com.wb.service.UserService; import com.wb.service.impl.UserServiceImpl; public class DoLoginServlet extends HttpServlet { private UserService userService=new UserServiceImpl(); /** * Constructor of the object. */ public DoLoginServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to * post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); //获取用户名 String userName=request.getParameter("userName"); //获取密码 String pwd=request.getParameter("pwd"); User user=new User(); user.setUserName(userName); user.setPwd(pwd); //service里面的登录方法判断登录是否成功 int count=userService.get(user); //把count的值传到前台的ajaxsuccess方法离 if(count>0){ request.getSession().setAttribute("userName",userName); } out.print(count); } /** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */ public void init() throws ServletException { // Put your code here } }