struts2中action接收參數的方式主要有以下三種:
1.使用action的屬性接收參數:在action類中定義屬性,創建getter和setter方法;
2.使用DomainModel接收參數:定義Model類,在action中定義Model類的對象(不需要new),創建該對象的getter和setter方法;
3.使用ModelDriven接收參數:action實現ModelDriven泛型接口,定義Model類的對象(必須new),通過getModel方法返回該對象;
struts2中action獲取表單傳值
1.通過屬性驅動式
①jsp頁面:
<form action="action/login.action" method="post">
<input type="text" name="username">
<input type="submit" value="submit">
</form>
②action:直接通過getter、setter方法獲取
public class loginAction 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,必須實現ModelDriven接口。對於要傳入多個model第二種方式不方便 ①jsp頁面
<form action="action/login.action" method="post">
<input type="text" name="username">
<input type="submit" value="submit">
</form>
②action:必須實現getModel() 方法
public class loginAction 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,也可使用多個model對象的屬性。 ①jsp頁面
<form action="login/login.action" method="post">
<input type="text" name="user.username">
<input type="text" name="teacher.level">
<input type="submit" value="submit">
</form>
②action: 必須提供setter方法
public class loginAction 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;
}
}