struts2中 Action获取表单参数的几种方式

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;

}

}