POJO(Plain Old Java Objects)简单的Java对象，实际就是普通JavaBeans，是为避免和EJB混淆所创造的简称
Property-Driven示例
标签name名与Action和POJO中名称保持一致即可
①.JSP
<s:form action="login.action" method="post" theme="simple">
<input type="text" name="userName" />
<br />
<input type="text" name="password" />
<br />
<s:submit name="login" value="登陆" method="login"></s:submit>
<s:submit name="add" value="新增" method="add"></s:submit>
</s:form>
②Action
public class LoginAction extends ActionSupport implements SessionAware,
ServletRequestAware {
private String userName;
private String password;
private String message;
//省略get set方法
③POJO
public class User {
private String userName;
private String password;
Model-Driven示例
在Action中定义整个POJO的对象并生成get set方法，在JSP调用时候，需要在属性名前加对象名
①JSP
用户名:<s:textfield name="user.userName" ></s:textfield><br />
密码:<s:password name="user.password" >br />>
②Action
public class RegisterAction {
private User user;
③POJO
public class User {
private String userName;
private String password;