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用户登录代码jsp

2017-09-19 9页 doc 48KB 18阅读

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用户登录代码jsp用户登录代码jsp 登录页面 用户名:    LoginServlet: package cn.edu.qfnu.ch08.servlet; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletContext; import javax.servlet.ServletException; i...
用户登录代码jsp
用户登录代码jsp <3(编写一个用户登录Java Web应用程序,要求使用Servelet监听器技术,当用户成功登 录后跳转到欢迎页面,在欢迎页面上显示当前在线人员的登录名称。 Login.jsp: <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 登录页面
用户名:
  
LoginServlet: package cn.edu.qfnu.ch08.servlet; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class LoginServlet */ public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public LoginServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取用户名信息 String username=request.getParameter("username"); //将用户名信息写入Session HttpSession session=request.getSession(); session.setAttribute("username", username); //将用户名信息写入ServletContext ServletContext ctx=this.getServletContext(); List onlineUserList=(List)ctx.getAttribute("onlineUserList"); //第一个用户访问时,需要初始化onlineUserList if(onlineUserList==null){ onlineUserList=new ArrayList(); } onlineUserList.add(username); //更新onlineUserList ctx.setAttribute("onlineUserList", onlineUserList); //转到显示当前用户的Servlet response.sendRedirect("ShowOnlineServlet"); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse respon se) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } } ShowOnlionServlet: ackage cn.edu.qfnu.ch08.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class ShowOnlineServlet */ public class ShowOnlineServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public ShowOnlineServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取当前用户的username HttpSession session=request.getSession(); String username=(String)session.getAttribute("username"); response.setContentType("text/html;charset=utf-8"); PrintWriter out=response.getWriter(); out.print(""); out.print(""); out.print(""); out.print("显示当前在线的所有用户名"); out.print(""); out.print(""); out.print(""); if(username!=null){ //给出注销链接 out.print(username+"欢迎访问, 注销
"); } ServletContext ctx=this.getServletContext(); List onlineUserList=(List)ctx.getAttribute("onlineUserList"); if(onlineUserList!=null&&onlineUserList.size()>0){ out.print("当前的在线用户为:"); //显示所有当前用户 for(int i=0;i"); out.print(""); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse respon se) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } } LogoutServlet: package cn.edu.qfnu.ch08.servlet; import java.io.IOException; import java.util.List; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * Servlet implementation class LogoutServlet */ public class LogoutServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public LogoutServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //获取session对象 HttpSession session=request.getSession(); //获取当前用户名 String username=(String)session.getAttribute("username"); //销毁session session.invalidate(); ServletContext ctx=this.getServletContext(); //在ServletContext中删除当前用户名 List onlineUserList=(List)ctx.getAttribute("onlineUserList"); onlineUserList.remove(username); ctx.setAttribute("onlineUserList", onlineUserList); //重定向到ShowOnlineServlet response.sendRedirect("ShowOnlineServlet"); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse respon se) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } } 经调试实验结果如图:
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