struts2中action接收引數的3種方法
Struts2中Action接收引數的方法主要有以下三種:
Struts2中Action接收引數的方法主要有以下三種:
1.使用Action的屬性接收引數:
a.定義:在Action類中定義屬性,建立get和set方法;
b.接收:通過屬性接收引數,如:userName;
c.傳送:使用屬性名傳遞引數,如:user1!add?userName=Magci;
2.使用DomainModel接收引數:
a.定義:定義Model類,在Action中定義Model類的物件(不需要new),建立該物件的get和set方法;
b.接收:通過物件的屬性接收引數,如:user.getUserName();
c.傳送:使用物件的屬性傳遞引數,如:user2!add?user.userName=MGC;
3.使用ModelDriven接收引數:
a.定義:Action實現ModelDriven泛型介面,定義Model類的物件(必須new),通過getModel方法返回該物件;
b.接收:通過物件的屬性接收引數,如:user.getUserName();
c.傳送:直接使用屬性名傳遞引數,如:user2!add?userName=MGC
struts2 Action獲取表單傳值
1.通過屬性驅動式
JSP:
<form
action= "sys/login.action" method= "post" >
<input
type= "text" name= "username" >
<input
type= "submit" value= "submit" >
</form>
|
Action:直接通過get、set方法獲取。
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.模型驅動方式,必須要實現ModelDriven<T>介面。對於要傳入多個model第二種方式不方便
JSP:
<form action="sys/login.action" method="post">
<input type="text" name="username">
<input type="submit" value="submit">
</form>
Action:必須實現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.第三種方式可以完全不實現ModelDriven<T>,也可使用多個model物件的屬性。
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: 必須提供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;
}
}