java - JSP 输入数据 (Welcome.Jsp) 无法通过 Java 代码获取 (OrderProcessingAction.saveOrUpdate() )

Question

JSP页面输入用户详细信息并发送到struts操作，struts.xml将操作映射到Action类OrderProcessingAction方法saveOrUpdate()并且此方法调用 DAO 类的 saveOrUpdateUser() ，其中实际数据访问数据库表字段。

以下是可交付成果:

1. JSP 页面:Welcome.jsp
   
2. ActionClass : OrderProcessingAction.java
   
3. 数据访问: UserDaoFactory.java 对象
   
4. struts.xml 文件
   

/**
 * Welcome.Jsp : Here my JSP page code.
 */
<s:form method="post" name="myform" action="saveOrUpdate.action">

    <s:textfield label="Customer Name" name="username" size="30"/>

    <s:password label="Customer Password" name="password" size="30"/>

    <s:textfield label="Contact No" name="contact" size="30"/>

    <s:textfield label="Email" name="email" size="30"/>

    <s:textfield label="City" name="city" size="30"/>


    <s:submit label="Submit" />
    <s:reset label="Clear"/>

</s:form>

这里是struts.xml 文件。

<action name="saveOrUpdate" 
        class="com.view.OrderProcessingAction" 
        method="saveOrUpdate">
 <result name="success">/Welcome.jsp</result>
</action> 

下面是我的 OrderProcessingAction (ActionClass)，我在其中调用 DAO 类方法。

private String username;
private String password;
private int contact;
private String email;
private String city;

//Pojo class OrderPorcessing reference initiated
OrderProcessing user = new OrderProcessing();   

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 getContact() {
    return contact;
}
public void setContact(int contact) {
    this.contact = contact;
}
public String getEmail() {
    return email;
}
public void setEmail(String email) {
    this.email = email;
}
public String getCity() {
    return city;
}
public void setCity(String city) {
    this.city = city;
}

  /**
  * To save or update user. 
   * @return String
  */
   public String saveOrUpdate(){

    userDaoFactory.saveOrUpdateUser(user);
    System.out.println("User Name: " +user.getUsername());
    return SUCCESS;
  }

下面是 DAO 类的 saveOrUpdate 方法。

     /**
     * Used to save or update a user by saveOrUpdate().
     * @return void
     */
      public void saveOrUpdateUser(User user) {
    try {
        session = HibernateUtil.getSessionFactory().openSession();
        tx = session.getTransaction();

        session.saveOrUpdate(user);

        tx.commit();
        session.close();

    } catch (Exception e) {

        e.printStackTrace();
    }
}

Answer 1

而不是这样做

System.out.println("User Name: " +user.getUsername());

这样做

System.out.println("User Name: " +getUsername());