Struts2中Action取得表单数据的几种方法

Struts2中Action取得表单数据的几种方法

Struts2中Action获得表单数据的几种方法
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{
　　 //using spring ioc or new manually　
    private User user=new User();
    private Teacher teacher=new 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;
    }
}