在jsp中，内通过内置对象 HttpServletRequest的getSession()方法可以获取到HttpSession，比如：
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <%@taglib uri="http://www.wyl.suneyaee" prefix="Wyl"%> 4 <!-- 引入jquery等 --> 5 <%@ include file="/WEB-INF/head.jsp"%> 6 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 7 <html> 8 9 <head> 10 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 11 <script type="text/javascript"> 12 <!-- 13 $(function() { 14 $('input').keydown(function(e) { 15 var curKey = e.which; 16 //46 是 Delete键 17 if (curKey == 46) { 18 clear(this); 19 $(this).focus(); 20 } 21 }); 22 23 $('#idUserName').keydown(function(event) { 24 var curKey = event.which; 25 //13 是回车键 26 if (curKey == 13) { 27 console.log('你按的是：回车' + '键'); 28 } 29 30 }); 31 /** 32 清除value值，主要是针对于input 33 */ 34 function clear(obj) { 35 $(obj).attr('value', null); 36 } 37 }) 38 </script> 39 40 <title>Insert title here</title> 41 </head> 42 <body> 43 <Wyl:getIP /> 44 45 <form action="doAjax"><input value="aaa" type="text"> <br> 46 <input value="doAJax" type="submit"></form> 47 48 <br> 49 <form action="wdAjax"><input value="MyAjax.myAjax()..." 50 type="text"> <br> 51 <input value="wdAjax" type="submit"></form> 52 53 <br> 54 用户名 55 <form action="toLogin"><input type="text" name="user.userName"> 56 <br> 57 <% 58 request.getSession().setAttribute("hahaAnyKey", "我是hahaAnyKey.jsp页面传入session的值"); 59 %> 60 <input type="text" name="user.passWord"> <input type="submit"> 61 </form> 62 63 64 <br> 65 用户名2 ，模型驱动，而且这个表单对应的LoginAction2.java中封装了dto,而且可以使用Delete键清空输入框 66 <form action="toLogin2"><input type="text" name="userName" 67 id="idUserName"> <br> 68 <input type="text" name="passWord"> <input type="submit"> 69 </form> 70 71 ----------- 72 <span xmlns="http://www.w3.org/1999/xhtml" 73 class="button collapse-button"></span> 74 75 </body> 76 </html>
中的58行，就可以获取到session，然后直接在HttpSession里存放一个值。
而在Struts2中，比如在一个action中，可以直接通过ActionContext.getContext().getSession()获取Session对象(注意：这个ActionContext是
com.opensymphony.xwork2.ActionContext类型的)，实际上这里的Session是一个Mapper,只是Struts2做了封装，我们还是可以通过这个mapper类型的Mapper来获取到上面登录页面放在HttpSession中的属性。
比如在一个action中就可以通过如下代码获取到上面jsp中存放在HttpSession中的属性，
1 ActionContext atx = ActionContext.getContext(); 2 Map<String, Object> session = atx.getSession(); 3 Set<String> set = session.keySet(); 4 Iterator it = set.iterator(); 5 while(it.hasNext()){ 6 String key = (String) it.next(); 7 String val = (String) session.get(key); 8 System.out.println("key:"+key+",value:"+val); 9 }
打印结果：
key:hahaAnyKey,value:我是hahaAnyKey.jsp页面传入session的值
这个Action的完整代码如下：
1 package com.log; 2 3 import java.io.PrintWriter; 4 import java.util.Iterator; 5 import java.util.Map; 6 import java.util.Set; 7 8 import javax.servlet.http.HttpServletResponse; 9 10 import org.apache.struts2.ServletActionContext; 11 12 import com.log.entity.User; 13 import com.log.service.UserService; 14 import com.opensymphony.xwork2.ActionContext; 15 import com.opensymphony.xwork2.ActionSupport; 16 import com.util.UtilTime; 17 18 /** 19 * 普通的登陆 20 * 21 * @author Wei 22 * 23 */ 24 public class LoginAction extends ActionSupport { 25 /** 26 * 27 */ 28 private static final long serialVersionUID = 1L; 29 private User user; 30 private UserService uService = new UserService(); 31 private String error; 32 33 public String getEror() { 34 return error; 35 } 36 37 public void setEror(String error) { 38 this.error = error; 39 } 40 41 public UserService getuService() { 42 return uService; 43 } 44 45 public void setuService(UserService uService) { 46 this.uService = uService; 47 } 48 49 public User getUser() { 50 return user; 51 } 52 53 public void setUser(User user) { 54 this.user = user; 55 } 56 57 @Override 58 public String execute() throws Exception { 59 /** 60 * 账号密码：wyl,1234 61 */ 62 if (uService.login(user)) { 63 ActionContext atx = ActionContext.getContext(); 64 Map<String, Object> session = atx.getSession(); 65 //对应于 WylInterceptor.java拦截器，这个拦截器里需要用到 66 session.put("currentUser", user); 67 //用来设置登录超时的参数 68 session.put("lastTime", UtilTime.getCurTime()); 69 return SUCCESS; 70 } else { 71 // this.error = "error"; 72 // return this.error; 73 HttpServletResponse resp = ServletActionContext.getResponse(); 74 //不加 resp.setContentType("text/html;charset=UTF-8"); 会出现页面的中文为乱码的情况 75 resp.setContentType("text/html;charset=UTF-8"); 76 PrintWriter out = resp.getWriter(); 77 out.println("账号："+user.getUserName()+",<br/>密码："+user.getPassWord()+" 的不正确，请确认"); 78 // out.println("<br/><input type="button" value="点我" />"); 79 out.println("<a href="login.jsp" style="color:orange;">点我重新登陆</a>"); 80 /** 81 * 下面的Map<String, Object> session = atx.getSession();为了演示获取到的session(实际上是Mapper，Struts2框架做了封装) 82 */ 83 ActionContext atx = ActionContext.getContext(); 84 Map<String, Object> session = atx.getSession(); 85 Set<String> set = session.keySet(); 86 Iterator it = set.iterator(); 87 while(it.hasNext()){ 88 String key = (String) it.next(); 89 String val = (String) session.get(key); 90 System.out.println("key:"+key+",value:"+val); 91 } 92 //什么都不返回，直接用HttpServletResponse在网页上写提示 93 return null; 94 } 95 } 96 }
，调试截图：
