屬性驅動： 
1、在action中定義很多頁面需要的屬性及其對應的getter，setter方法。 
2、前臺取值寫對應的屬性名稱

——————明顯不可取，不做解釋。

模型驅動： 
1、在action中定義實體，實現 ModelDriven介面，實現getModel()方法。 
2、前臺取值寫對應的屬性名稱

——————合理。

其實還有一種，介於兩者之間。 
1、在action中定義實體，寫getter，setter方法。 
2、前臺取值寫：實體.屬性名稱。

下面分別是三種方式的演示： 
實體類如下：

public class User {
    private int id;
    private String username;
    private
 
 String password;
    private int age;
    private String address;
    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;
    }
    public int getAge() {
       return age;
    }
    public void setAge(int age) {
       this.age = age;
    }
    public String getAddress() {
       return address;
    }
    public void setAddress(String address) {
       this.address = address;
    }
    public
 
 int getId() {
       return id;
    }
    public void setId(int id) {
       this.id = id;
    }
}

第一種：

 public class UserAction {
    private int id;
    private String username;
    private String password;
    private int age;
    private String address;

    public String add(){

       User user = new User();
       user.setId(id);
       user.setUsername(username);
       user.setPassword(password);
       user.setAge(age);
       user.setAddress(address);

       new UserManager().addUser(user);

       return "success";
    }

    public int getId() {
       return id;
    }
    public void setId(int id) {
       this.id = id;
    }
    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;
    }
    public int getAge() {
       return age;
    }
    public void setAge(int age) {
       this.age = age;
    }
    public String getAddress() {
       return address;
    }
    public void setAddress(String address) {
       this.address = address;
    }
}

JSP中寫法

<form action="test/user.action" method="post">
        <input type="hidden" name="method:add">
        username:<input type="text" name="username"> <br/>
        password:<input type="text" name="password"> <br/>
        age:<input type="text" name="age"> <br/>
        address:<input type="text" name="address"> <br/>
        <input type="submit" name="submit" value="新增使用者">
</form> <br/>

第二種:

public class UserAction implements ModelDriven{

    private User user;

    @Override
    public Object getModel() {
       if(user == null){
           user = new User();
       }
       return user;
    }

    public String add(){

       new UserManager().addUser(user);

       return "success";
    }
}

jsp 中寫法

<form action="test/user.action" method="post">
        <input type="hidden" name="method:add">
        username:<input type="text" name="username"> <br/>
        password:<input type="text" name="password"> <br/>
        age:<input type="text" name="age"> <br/>
        <input type="submit" name="submit" value="新增使用者">
</form> <br/>

第三種：

public class UserAction {

    private User user;

    public String add(){

       new UserManager().addUser(user);

       return "success";
    }

    public User getUser() {
       return user;
    }

    public void setUser(User user) {
       this.user = user;
    }
}

JSP中寫法：

<form action="test/user.action" method="post">
        <input type="hidden" name="method:add">
        username:<input type="text" name="user.username"> <br/>
        password:<input type="text" name="user.password"> <br/>
        age:<input type="text" name="user.age"> <br/>
        address:<input type="text" name="user.address"> <br/>
        <input type="submit" name="submit" value="新增使用者">
</form> <br/>