1、在执行action后，如果要在所跳转的目标页面中显示信息，则要用到Action和Session。
2、在Struts2中，Action已经与Servlet API分离，这使得Action具有更加灵活和低耦合的特性。
3、Struts2提供了ActionContext类；ActionContext是一个Action的上下文对象，Action运行期间所用到的数据都保存在ActionContext中。
4、通过ActionContext.getContext()方法获取ActionContext的实例对象。
5、ActionContext的其中一个方法： Map getSession() 返回一个Map类型的HttpSession对象。
6、代码事例
（1）Aciton中产生Session对象的代码
1 package com.action; 2 3 import com.factory.StudentDAOFactory; 4 import com.opensymphony.xwork2.ActionContext; 5 import com.vo.Student; 6 7 public class Login { 8 private String Type; 9 private String Username; 10 private String Password; 11 private String Msg; 12 public String getType() { 13 return Type; 14 } 15 public void setType(String type) { 16 Type = type; 17 } 18 public String getUsername() { 19 return Username; 20 } 21 public void setUsername(String username) { 22 Username = username; 23 } 24 public String getPassword() { 25 return Password; 26 } 27 public void setPassword(String password) { 28 Password = password; 29 } 30 public String getMsg() { 31 return Msg; 32 } 33 public void setMsg(String msg) { 34 Msg = msg; 35 } 36 public String execute()throws Exception{ 37 if(Type.equals("学生")){ 38 Student student = new Student(); 39 student.setStudent_Number(getUsername()); 40 student.setStudent_Password(getPassword()); 41 if(StudentDAOFactory.getIStudentDAOInstance().studentLogin(student)){ 42 ActionContext.getContext().getSession().put("student_number", student.getStudent_Number()); 43 ActionContext.getContext().getSession().put("student_name", student.getStudent_Name()); 44 ActionContext.getContext().getSession().put("student_sex", student.getStudent_Sex()); 45 ActionContext.getContext().getSession().put("student_domitory", student.getStudent_Domitory()); 46 ActionContext.getContext().getSession().put("student_password", student.getStudent_Password()); 47 ActionContext.getContext().getSession().put("student_absenceDate", student.getStudent_AbsenceDate()); 48 return "success"; 49 }else{ 50 Msg = "用户名或者密码错误"; 51 return "error"; 52 } 53 }else{ 54 Msg = "身份选择错误！"; 55 return "error"; 56 } 57 } 58 }
（2）跳转的目标页面中显示Action处理后的信息
1 <html> 2 <head> 3 4 <title>My JSP 'welcome.jsp' starting page</title> 5 6 </head> 7 8 <body> 9 successfully!!! 10 ${student_number } 11 ${student_name } 12 ${student_sex } 13 ${student_domitory } 14 ${student_password } 15 ${student_absenceDate } 16 </body> 17 </html>