struts2前台页面传值到action的三种方式

1 <form method="post" action="Student_reg!reg">
2     <input type="text" name="username"><br>
3     <input type="text" name="password"><br>
4     <input type="submit"><input type="reset">
5 </form>

 1 <struts>
 2     <constant name="struts.devMode" value="true"></constant>
 3     <package name="default" namespace="/" extends="struts-default">
 4         <action name="Student_*" class="cn.potato.action.StudentAction">
 5             <result name="{1}">
 6                 /Student_{1}_success.jsp
 7             </result>
 8         </action>
 9     </package>
10 </struts>  

 1 public class StudentAction{
 2     private String username;
 3     private String password;
 4     public String reg(){
 5         System.out.println(username);
 6         System.out.println(password);
 7         return "reg";
 8     }
 9     public String getUsername() {
10         return username;
11     }
12     public void setUsername(String username) {
13         this.username = username;
14     }
15     public String getPassword() {
16         return password;
17     }
18     public void setPassword(String password) {
19         this.password = password;
20     }
21 }

 1 /**通过getUser方法将A对象传给Struts2，Struts2调用setter方法进行赋值。
 2  *域模型
 3  */
 4 public class A {
 5     private String username;
 6     private String password;
 7     public String getUsername() {
 8         return username;
 9     }
10     public void setUsername(String username) {
11         this.username = username;
12     }
13     public String getPassword() {
14         return password;
15     }
16     public void setPassword(String password) {
17         this.password = password;
18     }
19 }
20 
21 //Action类
22 public class StudentAction{
23     private A user;
24     public String reg(){
25         System.out.println(user.getUsername());
26         System.out.println(user.getPassword());
27         return "reg";
28     }
29     public A getUser() {
30         return user;
31     }
32     public void setUser(A user) {
33         this.user = user;
34     }
35 }

 1 /**Action类中自己new出A对象，然后利用getModel()把它传给Struts2，Struts2调用它的setter方法。
 2  * Action类
 3  */
 4 
 5 public class StudentAction extends ActionSupport implements ModelDriven<A>{
 6     private A user=new A();
 7     public String reg(){
 8         System.out.println(user.getUsername());
 9         System.out.println(user.getPassword());
10         return "reg";
11     }
12     public A getModel() {
13         return user;
14     }
15 }