1.通过属性驱动式 





[html] view plaincopy
01.<form action="sys/login.action" method="post">   
02.    <input type="text" name="username">   
03.    <input type="submit" value="submit">   
04.</form> 


Action:直接通过get、set方法获取。



[java] view plaincopy
01.public class sysAction extends ActionSupport{   
02.    private String username;   
03.  
04.    public String login() throws Exception {   
05.        System.out.println(username);   
06.        return SUCCESS;   
07.    }   
08.  
09.    public String getUsername() {   
10.        return username;   
11.    }   
12.    public void setUsername(String username) {   
13.        this.username= username;   
14.    }   
15.}    


2.模型驱动方式，必须要实现ModelDriven<T>接口。对于要传入多个model第二种方式不方便 



[html] view plaincopy
01.<form action="sys/login.action" method="post">   
02.    <input type="text" name="username">   
03.    <input type="submit" value="submit">   
04.</form>         




Action:必须实现getModel() 方法





[java] view plaincopy
01.public class sysAction extends ActionSupport implements ModelDriven<User>{   
02.    private User user;   
03.  
04.    public String login() throws Exception {   
05.        System.out.println(getModel().getUsername());   
06.        return SUCCESS;   
07.    }   
08.  
09.    public User getModel() {   
10.        if (null == user) {   
11.            return user = new User();   
12.        }   
13.        return user;   
14.    }   
15.}    




3.第三种方式可以完全不实现ModelDriven<T>，也可使用多个model对象的属性。





[html] view plaincopy
01.<form action="sys/login.action" method="post">   
02.    <input type="text" name="user.username">   
03.    <input type="text" name="teacher.level">   
04.    <input type="submit" value="submit">   
05.</form>   




Action: 必须提供set方法



[java] view plaincopy
01.public class sysAction extends ActionSupport{   
02.    private User user;   
03.    private Teacher teacher;   
04.  
05.    public String login() throws Exception {   
06.        System.out.println(user.getUsername());   
07.        System.out.println(teacher.getLevel());   
08.        return SUCCESS;   
09.    }   
10.  
11.    public void setUser(User user) {   
12.        this.user = user;   
13.    }   
14.    public void setTeacher(Teacher teacher) {   
15.        this.teacher = teacher;   
16.    }   
17.}