Question

请帮我看看我哪里错了。我试图使用EJB依赖注入在我的数据库中创建一个新的成员实例。我有以下代码由Netbeans（AbstractFacade）生成

package session;

import java.util.List;
import javax.persistence.EntityManager;

/**
 *
 * @author JO
 */
public abstract class AbstractFacade<T> {

    private Class<T> entityClass;

    public AbstractFacade(Class<T> entityClass) {
        this.entityClass = entityClass;
    }

    protected abstract EntityManager getEntityManager();

    public void create(T entity) {
        getEntityManager().persist(entity);
    }

    //removed some code for clarity here, I'm only trying to understand create
}

然后我有我的EJB Member1的代码，我在其中添加了一个方法，它将两个STrings作为参数，名字和姓氏。

package entity;

import java.io.Serializable;
import java.util.Collection;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;

/**
 *
 * @author JO
 */
@Entity
@Table(name = "member")
@XmlRootElement

public class Member1 implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id_member")
    private Integer idMember;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 45)
    @Column(name = "first_name")
    private String firstName;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 45)
    @Column(name = "surname")
    private String surname;
    @Basic(optional = false)
    @NotNull
    @Column(name = "number_of_credits")
    private short numberOfCredits;
    // @Pattern(regexp="^\\(?(\\d{3})\\)?[- ]?(\\d{3})[- ]?(\\d{4})$", message="Invalid phone/fax format, should be as xxx-xxx-xxxx")//if the field contains phone or fax number consider using this annotation to enforce field validation
    @Size(max = 45)
    @Column(name = "phone")
    private String phone;
    // @Pattern(regexp="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?", message="Invalid email")//if the field contains email address consider using this annotation to enforce field validation
    @Size(max = 45)
    @Column(name = "email")
    private String email;
    @Lob
    @Column(name = "image")
    private byte[] image;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 45)
    @Column(name = "password")
    private String password;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "member1")
    private Collection<AttendedSession> attendedSessionCollection;
    @OneToOne(cascade = CascadeType.ALL, mappedBy = "member1")
    private NextSession nextSession;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "memberIdMember")
    private Collection<Block> blockCollection;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "member1")
    private Collection<MemberWithSession> memberWithSessionCollection;

    public Member1() {
    }


    // added this to allow creation of Member in way that suits me
    public Member1(String firstName, String surname){
       this.firstName = firstName;
       this.surname = surname; 

    }

 ///removed other generated code for clarity here
}

然后我再次生成了这个Member1Facade代码，我添加了代码来创建并将成员保存到数据库中。

  @Stateless
public class Member1Facade extends AbstractFacade<Member1> {

    @PersistenceContext(unitName = "fitnessPU")
    private EntityManager em;

    @Override
    protected EntityManager getEntityManager() {
        return em;
    }

    public Member1Facade() {
        super(Member1.class);
    }
     // added this to allow creation of Member in way that suits me
    public Member1 newMember(String firstName, String surname){
        Member1 member = new Member1();
      member.setFirstName(firstName);
       member.setSurname(surname); 
       em.persist(member);
       return member;
    }

}

最后，这是我的addMember.java代码，它应该从JSP表单获取数据，并且想法是它将通过依赖注入添加到数据库。

package servlets;

import entity.Member1;
import java.io.IOException;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import session.Member1Facade;


public class addMember extends HttpServlet {
@EJB
Member1Facade memberFacade;
  Member1 member;



    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */


    /**
     * declare password as member
     * @param request
     * @param response
     * @throws javax.servlet.ServletException
     * @throws java.io.IOException
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {


          try{
            String firstname = request.getParameter("first");
            String surname = request.getParameter("surname");
            String email = request.getParameter("email");
            String phone = request.getParameter("phone");

         memberFacade.newMember(firstname, surname);

      }
      catch (Exception e){
          System.out.println("error");
      }
//some further code removed for brevity

}

这一切都编译但没有什么事情发生。我无法弄清楚我做错了什么，而且我花了几天时间在网上看。我真的很感激我的错误。

EJB依赖注入

0 个答案: