Servlet——Session会话技术小实验

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<span style="font-size:18px;">package myservlet;/* * Session 会话技术目的是服务器只能服务一个浏览器，防止非法登陆，运行在服务器端； */import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class Servlet1 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();    String erro= (String)request.getAttribute("error");            out.println("<form action='/Myservlet/Servlet2' method='post'>");out.println("<h1>欢迎登陆</h1>");out.println("用户名:<input type='text' name='userid'/><br/>");out.println("密  码:<input type='password' name='passwor<pre name="code" class="java"></span>

<span style="font-size:18px;"><span style="font-size:18px;">d'/><br/>");out.println("<input type='submit' value='登陆'>");out.println("验证码<img src=''/>");out.println("</from>"); if(erro!=null){ out.println("<h5 style='color:red'>"+erro+"</h5>"); } }public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { this.doGet(request, response);}}</span></span>

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