struts2采用域模型方式接收参数

struts.xml:

<struts>
<constant name="struts.i18n.encoding" value="gbk" />
 <constant name="struts.devMode" value="true" />
  <package name="user" namespace="/user" extends="struts-default">
        <action name="user" class="com.sd.action.TestAction">
            <result>
             /rec.jsp
            </result>
        </action>
    </package>
</struts>
-----------------------------------------
index.jsp:
<form action="user/user!rec" method="post">

     姓名：<input type="text" name="user.username"><br/>
     密码：<input type="password" name="user.password"><br/>

     <input type="submit" value="提交"/> 
</form>
--------------------------
Action:
public class TestAction extends ActionSupport {
 private User user;
 public User getUser() {
  return user;
 }
 public void setUser(User user) {
  this.user = user;
 }
 public String rec() {
  if(user != null) {
   System.out.println("username=" + user.getUsername());
   System.out.println("password=" + user.getPassword());
  } else {
   System.out.println(user);
  }
  return SUCCESS;
 }
-----------------------------------