模型驱动,与之前的属性驱动区别在于把所有的属性封装在一个JavaBean(模型)中,当用户提交数据时,自动调用模型属性的setter方法设置属性值,缺点在于没有属性驱动灵活。 User.java(模型):
package com.bean;
public class User {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return this.username+" "+this.password;
}
}
Action除了继承ActionSupport还要实现ModelDriven接口,该接口定义了一个getModel()方法,返回经过赋值的模型实例:
package com.struts2;
import com.bean.User;
import com.impl.LoginServiceImpl;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.service.LoginService;
public class LoginAction extends ActionSupport implements ModelDriven {
public User user=new User();
private LoginService loginService=new LoginServiceImpl();
//LoginService是登录的
/**
* getModel方法自动将提交的数据给user属性赋值
*/
@Override
public User getModel() {
// TODO Auto-generated method stub
return user;
}
public String execute() throws Exception
{
if(loginService.isLogin(user))
{
return SUCCESS;
}
this.addActionError("用户名或密码错误");
return INPUT;
}
}
struts.xml配置与原属性驱动无异。