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>
时间： 2024-10-11 08:02:01