矢量不能投到IUser

===============================矢量不能投到IUser

現在我有問題登錄頁面;矢量無法投射到IUSER

我無國籍豆

/* 
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* and open the template in the editor. 
*/ 

package com.DAO; 

import com.entity.IUser; 
import java.util.List; 
import javax.ejb.Stateless; 
import javax.ejb.LocalBean; 
import javax.persistence.EntityManager; 
import javax.persistence.PersistenceContext; 
import javax.persistence.Query; 

/** 
* 
* @author Kency 
*/ 
@Stateless 
@LocalBean 
public class UserBean { 
    @PersistenceContext(unitName = "mcGrawLibPro-ejbPU") 
    private EntityManager em; 


    public List<IUser> retrieveAllUser(){ 
     return em.createNamedQuery("IUser.findAll").getResultList(); 
    } 

    public IUser userLogin(String username, String password){ 
    Query query = em.createNamedQuery("IUser.findByUsernameAndPassword"); 
    query.setParameter("username", username); 
    query.setParameter("password", password); 
    return (IUser) query.getResultList(); 
    } 

    public void persist(Object object) { 
     em.persist(object); 
    } 

    public IUser findByID(Integer id){ 
     return em.find(IUser.class, id); 
    } 

    // Add business logic below. (Right-click in editor and choose 
    // "Insert Code > Add Business Method") 

}

和我的JSF Managed Bean的

/* 
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* and open the template in the editor. 
*/ 

package com.mcgraw.controller; 

import com.DAO.UserBean; 
import com.entity.IUser; 
import java.io.Serializable; 
import javax.ejb.EJB; 
import javax.faces.bean.ManagedBean; 
import javax.faces.bean.SessionScoped; 

/** 
* 
* @author Kency 
*/ 
@ManagedBean 
@SessionScoped 
public class LoginController implements Serializable{ 
    @EJB 
    private UserBean userBean; 
    private IUser user; 
    private boolean admin; 
    private boolean mod; 



    /** Creates a new instance of LoginController */ 
    public LoginController() { 
     user = new IUser(); 

    } 

    //getter/setter 
    public boolean isMod() { 
     return mod; 
    } 

    public void setMod(boolean mod) { 
     this.mod = mod; 
    } 


    public IUser getUser() { 
     return user; 
    } 

    public void setUser(IUser user) { 
     this.user = user; 
    } 
    public boolean isAdmin() { 
     return admin; 
    } 

    public void setAdmin(boolean admin) { 
     this.admin = admin; 
    } 




    public String login() { 

     user = userBean.userLogin(user.getUsername(), user.getPassword()); 
     if (user != null) { 
      setAdmin(user.getGroups().getAdmin()); 
      setMod(user.getGroups().getMod()); 
      return "home"; 
     } else { 

      return "login"; 
     } 
    } 


    public String logout() { 
     user = null; 
     return "login"; 
    } 

    public boolean isLoggedIn() { 
     return user != null; 
    } 


}

我的實體Bean

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 

package com.entity; 

import java.io.Serializable; 
import java.util.Date; 
import java.util.List; 
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.JoinColumn; 
import javax.persistence.ManyToOne; 
import javax.persistence.NamedQueries; 
import javax.persistence.NamedQuery; 
import javax.persistence.OneToMany; 
import javax.persistence.Table; 
import javax.persistence.Temporal; 
import javax.persistence.TemporalType; 

/** 
* 
* @author Kency 
*/ 
@Entity 
@Table(name = "user") 
@NamedQueries({ 
    @NamedQuery(name = "IUser.findAll", query = "SELECT i FROM IUser i"), 
    @NamedQuery(name = "IUser.findByUserid", query = "SELECT i FROM IUser i WHERE i.userid = :userid"), 
    @NamedQuery(name = "IUser.findByUsername", query = "SELECT i FROM IUser i WHERE i.username = :username"), 
    @NamedQuery(name = "IUser.findByPassword", query = "SELECT i FROM IUser i WHERE i.password = :password"), 
    @NamedQuery(name = "IUser.findByEmail", query = "SELECT i FROM IUser i WHERE i.email = :email"), 
    @NamedQuery(name = "IUser.findByGender", query = "SELECT i FROM IUser i WHERE i.gender = :gender"), 
    @NamedQuery(name = "IUser.findByDob", query = "SELECT i FROM IUser i WHERE i.dob = :dob"), 
    @NamedQuery(name = "IUser.findByZipcode", query = "SELECT i FROM IUser i WHERE i.zipcode = :zipcode"), 
    @NamedQuery(name = "IUser.findByIstate", query = "SELECT i FROM IUser i WHERE i.istate = :istate"), 
    @NamedQuery(name = "IUser.findByAddress", query = "SELECT i FROM IUser i WHERE i.address = :address"), 
    @NamedQuery(name = "IUser.findByCity", query = "SELECT i FROM IUser i WHERE i.city = :city"), 
    @NamedQuery(name = "IUser.findByUsernameAndPassword", query = "SELECT i FROM IUser i WHERE i.username = :username AND i.password = :password "), 
    @NamedQuery(name = "IUser.findByActive", query = "SELECT i FROM IUser i WHERE i.active = :active")}) 
public class IUser implements Serializable { 
    private static final long serialVersionUID = 1L; 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Basic(optional = false) 
    @Column(name = "userid") 
    private Integer userid; 
    @Basic(optional = false) 
    @Column(name = "username") 
    private String username; 
    @Basic(optional = false) 
    @Column(name = "password") 
    private String password; 
    @Basic(optional = false) 
    @Column(name = "email") 
    private String email; 
    @Basic(optional = false) 
    @Column(name = "gender") 
    private String gender; 
    @Basic(optional = false) 
    @Column(name = "dob") 
    @Temporal(TemporalType.TIMESTAMP) 
    private Date dob; 
    @Basic(optional = false) 
    @Column(name = "zipcode") 
    private int zipcode; 
    @Basic(optional = false) 
    @Column(name = "istate") 
    private String istate; 
    @Basic(optional = false) 
    @Column(name = "address") 
    private String address; 
    @Basic(optional = false) 
    @Column(name = "city") 
    private String city; 
    @Basic(optional = false) 
    @Column(name = "active") 
    private boolean active; 
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "iUser") 
    private List<Rent> rentList; 
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "iUser") 
    private List<Cart> cartList; 
    @JoinColumn(name = "igroup", referencedColumnName = "groupsid") 
    @ManyToOne(optional = false) 
    private Groups groups; 

    public IUser() { 
    } 

    public IUser(Integer userid) { 
     this.userid = userid; 
    } 

    public IUser(String username, String password) { 
     this.username = username; 
     this.password = password; 
    } 

    public IUser(Integer userid, String username, String password, String email, String gender, Date dob, int zipcode, String istate, String address, String city, boolean active) { 
     this.userid = userid; 
     this.username = username; 
     this.password = password; 
     this.email = email; 
     this.gender = gender; 
     this.dob = dob; 
     this.zipcode = zipcode; 
     this.istate = istate; 
     this.address = address; 
     this.city = city; 
     this.active = active; 
    } 

    public Integer getUserid() { 
     return userid; 
    } 

    public void setUserid(Integer userid) { 
     this.userid = userid; 
    } 

    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 getEmail() { 
     return email; 
    } 

    public void setEmail(String email) { 
     this.email = email; 
    } 

    public String getGender() { 
     return gender; 
    } 

    public void setGender(String gender) { 
     this.gender = gender; 
    } 

    public Date getDob() { 
     return dob; 
    } 

    public void setDob(Date dob) { 
     this.dob = dob; 
    } 

    public int getZipcode() { 
     return zipcode; 
    } 

    public void setZipcode(int zipcode) { 
     this.zipcode = zipcode; 
    } 

    public String getIstate() { 
     return istate; 
    } 

    public void setIstate(String istate) { 
     this.istate = istate; 
    } 

    public String getAddress() { 
     return address; 
    } 

    public void setAddress(String address) { 
     this.address = address; 
    } 

    public String getCity() { 
     return city; 
    } 

    public void setCity(String city) { 
     this.city = city; 
    } 

    public boolean getActive() { 
     return active; 
    } 

    public void setActive(boolean active) { 
     this.active = active; 
    } 

    public List<Rent> getRentList() { 
     return rentList; 
    } 

    public void setRentList(List<Rent> rentList) { 
     this.rentList = rentList; 
    } 

    public List<Cart> getCartList() { 
     return cartList; 
    } 

    public void setCartList(List<Cart> cartList) { 
     this.cartList = cartList; 
    } 

    public Groups getGroups() { 
     return groups; 
    } 

    public void setGroups(Groups groups) { 
     this.groups = groups; 
    } 

    @Override 
    public int hashCode() { 
     int hash = 0; 
     hash += (userid != null ? userid.hashCode() : 0); 
     return hash; 
    } 

    @Override 
    public boolean equals(Object object) { 
     // TODO: Warning - this method won't work in the case the id fields are not set 
     if (!(object instanceof IUser)) { 
      return false; 
     } 
     IUser other = (IUser) object; 
     if ((this.userid == null && other.userid != null) || (this.userid != null && !this.userid.equals(other.userid))) { 
      return false; 
     } 
     return true; 
    } 

    @Override 
    public String toString() { 
     return "com.entity.IUser[userid=" + userid + "]"; 
    } 

}

我的轉換器類

package com.mcgraw.controller; 


import com.entity.IUser; 
import javax.faces.application.FacesMessage; 
import javax.faces.component.UIComponent; 
import javax.faces.context.FacesContext; 
import javax.faces.convert.Converter; 
import javax.faces.convert.ConverterException; 
import javax.faces.convert.FacesConverter; 

/** 
* 
* @author Kency 
*/ 
@FacesConverter(forClass=IUser.class) 
public class UserConverter implements Converter{ 
    private IUser user; 


    @Override 
    public Object getAsObject(FacesContext context, UIComponent component, String value) { 


     if(user == null){ 
     user = new IUser(Integer.valueOf(value)); 
     return user; 
     }else{ 
     throw new ConverterException(new FacesMessage(String.format("Cannot convert %s to User", value))); 

     } 
    } 

    @Override 
    public String getAsString(FacesContext context, UIComponent component, Object value) { 
     return String.valueOf(((IUser) value).getUserid()); 
    } 

}

我有矢量錯誤無法投射到IUser 我不知道它爲什麼錯誤？我創建了1個類來轉換IUser，但爲什麼錯誤？但當我改變query.getResultlist（）爲==> query.getSingleResult（）;它工作得很好爲什麼？（現在我還沒有檢查用戶登錄或不只是嘗試創建登錄頁面）

來源

2010-10-02 Kency

return (IUser) query.getResultList();

我認爲query.getResultList()返回向量。您需要將的第一個值拉出並進行適當的轉換。目前您正在投射完整的結果列表。

另請注意，檢查結果列表實際上是否包含1值（最常見的情況是隻有一個值）是一種很好的做法。

來源

2010-10-02 13:31:52

謝謝你的建議：D – Kency 2010-10-02 15:27:01

矢量不能投到IUser

回答

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