java sevlet中使用session，会话跟踪技术

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1.新建一个Dynamic Web Project项目，里面新建两个java文件和一个jsp文件，整体的框架如下所示：

2.UseSessionSevlet.java文件里面的代码如下所示:

package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;@WebServlet(name = "useSession", urlPatterns = { "/sendMyName" })public class UseSessionSevlet extends HttpServlet {private static final long serialVersionUID = 1L;@Overridepublic void init(ServletConfig config) throws ServletException {super.init(config);}protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();request.setCharacterEncoding("utf-8");String name = request.getParameter("user");if (name == null || name.trim().length() == 0) {response.sendRedirect("useSession.jsp");} else {HttpSession session = request.getSession(true);session.setAttribute("myName", name);out.println("<html><body>");out.println("您请求的sevlet对象是：" + getServletName());out.println("<br>您的会话ID是：" + session.getId());out.println("<br>单击请求另一个sevlet：");out.println("<br><a href='showMyName'>请求另一个sevlet</a>");out.println("</html></body>");}}}

3.ShowNameSevlet.java文件里面的代码如下所示：

package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;@WebServlet(name = "showName", urlPatterns = { "/showMyName" })public class ShowNameSevlet extends HttpServlet {private static final long serialVersionUID = 1L;@Overridepublic void init(ServletConfig config) throws ServletException {super.init(config);}@Overrideprotected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {doPost(request, response);}@Overrideprotected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();HttpSession session = request.getSession(true);String name = (String) session.getAttribute("myName");out.println("<html><body>");out.println("您请求的sevlet对象是：" + getServletName());out.println("<br>您的会话ID是：" + session.getId());out.println("<br>您会话中存储的用户名是：" + name);out.println("</html></body>");}}

4.useSession.jsp里面的代码如下所示：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title></title></head><body><form action="sendMyName" method="post"><table><tr><td>用户名：</td><td><input type="text" name="user" /></td></tr><tr><td><input type="submit" value="提交" /></td></tr></table></form></body></html>

5.在浏览器里面输入http://localhost:8080/Servlet/useSession.jsp运行得到的结果如下所示：

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