JAVAWEB 一一 userweb2（升级，servlet版,jstl和el）

package com.user.servlet.user;

import java.io.IOException;


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

import com.user.service.UserService;
import com.user.service.impl.UserServiceImpl;

public class UserServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UserServlet() {
		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 {
	   	//设置前台页面参数编码格式
    	request.setCharacterEncoding("UTF-8");
    	//获取前台页面参数
    	String username = request.getParameter("username");
    	String password = request.getParameter("password3");
    	//调用Sevice层方法  判断是否登陆成功
    	UserService service = new UserServiceImpl();
    	boolean isLogin = service.isLogin(username, password);
    	//如果登陆成功则跳转至success.jsp,否则跳转至login.jsp重新登陆
    	if(isLogin){
    	//转发
    		request.getRequestDispatcher("EmpServlet").forward(request, response);
    	}else{
    	 //重定向
    		response.sendRedirect("jsp/login.jsp");
    	}

	}

	/**
	 * 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 {
		doGet(request,response);

	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}

package com.user.servlet.user;

import java.io.IOException;


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

import com.user.service.UserService;
import com.user.service.impl.UserServiceImpl;

public class UserServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UserServlet() {
		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 {
	   	//设置前台页面参数编码格式
    	request.setCharacterEncoding("UTF-8");
    	//获取前台页面参数
    	String username = request.getParameter("username");
    	String password = request.getParameter("password3");
    	//调用Sevice层方法  判断是否登陆成功
    	UserService service = new UserServiceImpl();
    	boolean isLogin = service.isLogin(username, password);
    	//如果登陆成功则跳转至success.jsp,否则跳转至login.jsp重新登陆
    	if(isLogin){
    	//转发
    		request.getRequestDispatcher("EmpServlet").forward(request, response);
    	}else{
    	 //重定向
    		response.sendRedirect("jsp/login.jsp");
    	}

	}

	/**
	 * 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 {
		doGet(request,response);

	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}