一、DomainModel（域模型）
1、
应用场景：一般我们在struts2的action中接收参数通常是如下方式
package cn.orlion.user;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
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;
}
public String login(){
System.out.println("username=" + username);
System.out.println("password=" + password);
return SUCCESS;
}
}这样会产生一个问题，当我们要获取的属性增多的话比如我们要加上age、sex、birthday…等等这样我们就要写巨多的get\set方法。显然不可取，所以这时就可以用DomainModel来接收参数。
首先创建一个包：cn.orlion.model,然后创建一个User类，如下：
package cn.orlion.model;
public class User {
private String username;
private String password;
private String age;
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 String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}将上边的UserAction改成：
package cn.orlion.user;
import com.opensymphony.xwork2.ActionSupport;
import cn.orlion.model.User;
public class UserAction extends ActionSupport{
private User user;
public String login(){
System.out.println("username=" + user.getUsername());
System.out.println("password=" + user.getPassword());
System.out.println("age=" + user.getAge());
return SUCCESS;
}
public User getUser(){
return user;
}
public void setUser(User user){
this.user = user;
}
}当访问
http://localhost:8080/Struts2Demo1/user/login.action?user.username=1&user.password=2&user.age=3时就会在控制台打印出username=1
password=2
age=3
2、DTO（Data transfer
Object）数据传输对象
上边的代码已经很好的解决了属性过多的问题，但仍然存在一个问题：当我们有一个属性不能添加到user中时，（比如注册页面通常会有一个确认密码的输入框用来接收passwordConfim）怎么办？这时就可以用DTO解决。由DTO生成域对象。
首先创建一个包cn.orlion.dto,然后创建一个类UserDTO如下：
package cn.orlion.dto;
public class UserDTO {
private String username;
private String password;
private String passwordConfirm;
private String age;
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
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 String getPasswordConfirm() {
return passwordConfirm;
}
public void setPasswordConfirm(String passwordConfirm) {
this.passwordConfirm = passwordConfirm;
}
}然后UserAction改为：
package cn.orlion.user; import com.opensymphony.xwork2.ActionSupport; import cn.orlion.dto.UserDTO;
import cn.orlion.model.User; public class UserAction extends ActionSupport{ private UserDTO userdto; public String login(){ String password = userdto.getPassword();
String passwordConfirm = userdto.getPasswordConfirm(); System.out.println(password + "-" + passwordConfirm); if (!password.equals(passwordConfirm)) {
System.out.println("两次输入密码不一致");
return ERROR;
} User user = new User(); user.setUsername(userdto.getUsername());
user.setPassword(userdto.getPassword());
user.setAge(userdto.getAge());
// 添加用户操作... return SUCCESS;
} public UserDTO getUserdto() {
return userdto;
} public void setUserdto(UserDTO userdto) {
this.userdto = userdto;
}
}
访问http://localhost:8080/Struts2Demo1/user/login.action?userdto.username=1&userdto.password=2&userdto.passwordConfirm=2&userdto.age=3
这样就可以了。
二、ModelDriven
这种方式是让Action类实现ModelDriven接口：
package cn.orlion.user;
import com.opensymphony.xwork2.ModelDriven;
import cn.orlion.model.User;
public class UserAction implements ModelDriven<User>{
private User user;
public String login(){
System.out.println(user.getUsername());
System.out.println(user.getPassword());
return "success";
}
public User getUser(){
return user;
}
public void setUser(User user){
this.user = user;
}
@Override
// 由于实现接口泛型指定为User所以返回值类型就不是Object而是User了。
public User getModel() {
return user;
}
}这样当访问http://localhost:8080/Struts2Demo/user/login.action?user.username=1&user.password=2控制台就会打印1、2。