所谓ModelDriven
，意思是直接把实体类当成页面数据的收集对象。比如，有实体类User
如下：
|
package
cn.com.leadfar.struts2.actions;
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;
}
}
|
假如要写一个Action
，用来添加User
。
第一种做法是直接在Action
中定义所有需要的属性，然后在JSP
中直接用属性名称来提交数据：
UserAction:
|
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;
}
}
|
add_input.jsp:
|
<
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
=
"
添加用户
"
>
</
form
>
<
br
/>
|
上述做法不好之处是：如果实体类的属性非常多，那么Action
中也要定义相同的属性。
第二种做法是将User
对象定义到UserAction
中，然后在JSP
中通过user
属性来给user
赋值：
UserAction:
|
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;
}
}
|
add_input.jsp:
|
<
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"
>
<
|