Struts2 Action接收表单参数

struts2 Action获取表单传值   

1.通过属性驱动式   


JSP:   


    <form action="sys/login.action" method="post">   


        <input type="text" name="username">   


        <input type="submit" value="submit">   


    </form>   


       


Action:直接通过get、set方法获取。

public class sysAction extends ActionSupport{
    private String username;   

    public String login() throws Exception {
        System.out.println(username);
        return SUCCESS;
    }   

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username= username;
    }
}
       

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   


JSP:   


    <form action="sys/login.action" method="post">   


        <input type="text" name="username">   


        <input type="submit" value="submit">   


    </form>   


       


Action:必须实现getModel() 方法

public class sysAction extends ActionSupport implements ModelDriven<User>{
    private User user;   

    public String login() throws Exception {
        System.out.println(getModel().getUsername());
        return SUCCESS;
    }   

    public User getModel() {
        if (null == user) {
            return user = new User();
        }
        return user;
    }
}
       

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。   


JSP:   


    <form action="sys/login.action" method="post">   


        <input type="text" name="user.username">   


        <input type="text" name="teacher.level">   


        <input type="submit" value="submit">   


    </form>   


       


Action: 必须提供set方法

public class sysAction extends ActionSupport{
    private User user;
    private Teacher teacher;   

    public String login() throws Exception {
        System.out.println(user.getUsername());
        System.out.println(teacher.getLevel());
        return SUCCESS;
    }   

    public void setUser(User user) {
        this.user = user;
    }
    public void setTeacher(Teacher teacher) {
        this.teacher = teacher;
    }
}