struts2 Action获取表单数据

1.通过属性驱动式  

 

1.首先设置 表单中的数据的name值 如：<input type="text" name="username" value="">
2.你用的是struts2，那么就在java类中写一个变量：变量名和页面上的name值一致 并有这个变量的get 和set方法 ，这样就能取到值了。

<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  

<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。

 

<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;
    }
}