Hibernate + Facelet JSF Managed Bean出错

Question

我看过this tutorial。我尝试，但我得到错误。我们有Mysql和netbean 7.0.1。一个名为“customer”的表，列：“id int，name varchar，email varchar，description varchar”。我用Hibernate来映射表。这是我的模型类：

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

import domain.Customer; 
import java.util.List; 
import org.hibernate.Query; 
import org.hibernate.Session; 
import org.hibernate.Transaction; 

/** 
* 
* @author xuanhung2401 
*/ 
public class CustomerModel { 

    Session session = null; 

    public CustomerModel(){ 
     session = HibernateUtil.getSessionFactory().getCurrentSession(); 
    } 

    public List<Customer> getAllCustomer(int startId, int endId){ 
     List<Customer> list = null; 
     try{ 
      session = HibernateUtil.getSessionFactory().getCurrentSession(); 
      Transaction ts = session.beginTransaction(); 
      Query query = session.createQuery("from Customer"); 
      list = (List<Customer>)query.list(); 
     } 
     catch(Exception ex){ 
      ex.printStackTrace(); 
     } 
     return list; 
    } 

    public Customer getById(int id){ 
     Customer c = new Customer(); 
     try{ 
      Transaction ts = session.beginTransaction(); 
      Query query = session.createQuery("from Customer as c where c.id = "+id); 
      c = (Customer)query.uniqueResult(); 
     }catch(Exception ex){ 
      ex.printStackTrace(); 

     } 

     return c; 
    } 

    public boolean updateCustomer(Customer c){ 
     try{ 
      Transaction ts = session.beginTransaction(); 
      session.update(c); 
      ts.commit(); 
      return true; 

     }catch(Exception ex){ 
      ex.printStackTrace(); 
      return false; 
     }  
    } 

    public boolean addCustomer(Customer c){ 
     try{ 
      Transaction ts = session.beginTransaction(); 
      session.save(c);    
      ts.commit();    
      return true; 
     }catch(Exception ex){ 
      ex.printStackTrace(); 
      return false; 
     }   
    } 

    public boolean deleteCustomer(Customer c){ 
     try{ 
      Transaction ts = session.beginTransaction(); 
      session.delete(c); 
      ts.commit(); 
      return true; 
     }catch(Exception ex){ 
      ex.printStackTrace(); 
      return false; 
     } 
    } 
} 

这是我的控制器：

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

import domain.Customer; 
import javax.faces.bean.ManagedBean; 
import javax.faces.bean.SessionScoped; 
import javax.faces.context.FacesContext; 
import javax.faces.model.DataModel; 
import javax.faces.model.ListDataModel; 
import javax.faces.view.facelets.FaceletContext; 
import model.CustomerModel; 

/** 
* 
* @author xuanhung2401 
*/ 
@ManagedBean 
@SessionScoped 
public class CustomerController { 

    CustomerModel model; 
    DataModel customers; 
    Customer currentCustomer; 
    /** Creates a new instance of CustomerController */ 
    public CustomerController() { 
     model = new CustomerModel(); 
    } 

    public DataModel getCustomers(){ 
     if (customers==null) { 
      customers = new ListDataModel(model.getAllCustomer(1, 3)); 
     } 
     return customers; 
    } 

    public void recreateModel(){ 
     customers = null; 

    } 


    public Customer getCurrentCustomer(){ 
     if (currentCustomer==null) { 
      currentCustomer = new Customer(); 
     } 
     return currentCustomer; 
    } 

    public String editCustomer(){ 
     int id = 0;   
     try { 
      id = Integer.parseInt(FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("id")) ;   
      currentCustomer = model.getById(id); 
      if (currentCustomer!=null) { 
       return "edit"; 
      } 
     }catch(Exception ex){ 

     }     
     return "myTemplateClient"; 
    } 
    public String editProcess(){ 
     try{ 
      model.updateCustomer(currentCustomer); 
      recreateModel(); 
     }catch(Exception ex){ 

     }   
     return "myTemplateClient"; 
    } 

    public String addCustomer(){ 
     currentCustomer = new Customer(); 
     return "add"; 
    } 

    public String addProcess(){ 
     if (currentCustomer!=null) { 
      model.addCustomer(currentCustomer);      
      currentCustomer = new Customer(); 
      recreateModel(); 
     }   
     return "myTemplateClient"; 
    } 

    public String deleteCustomer(){ 
     int id = 0;   
     id = Integer.parseInt(FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("id")) ;   
     currentCustomer = model.getById(id); 
     model.deleteCustomer(currentCustomer); 
     recreateModel(); 
     return "myTemplateClient"; 
    } 

    public String goIndex(){ 
     return "myTemplateClient"; 
    } 

    public String prepareView(){ 
     currentCustomer = (Customer) customers.getRowData(); 
     if (currentCustomer !=null) { 
      return "details"; 
     } 
     return "myTemplateClient"; 
    } 


} 

正如你看到的，我们有4个观点：myTemplateClient.xhtml，add.xhtml，edit.xhtml，details.xhtml。我通过“return”viewname“;”命令进行导航。问题是：

1. 地址栏与我正在查看的页面地址栏不一样。例如：我正在阅读myTemplateClient.xhtml，但地址栏是：localhost：8080/iDo_Hibernate/faces/details.xhtml（它必须是：localhost：8080/iDo_Hibernate/faces/myTemplateClient.xhtml）。之后，当我跳转到add.xhtml时，地址栏是：localhost：8080/iDo_Hibernate/faces/myTemplateClient.xhtml。

2. 当我添加新客户后，它重定向到“myTemplateClient”页面（这是索引页面，显示所有客户），地址栏为：localhost：8080/iDo_Hibernate/faces/add.xhtml。现在，当我刷新浏览器时，它会向更多客户添加相同的信息。我尝试清除添加的对象，但仍然错误。

   请帮我解决这个错误（原谅我，因为我的英文不好）。谢谢阅读。

Answer 1

似乎与网址的问题是，因为使用的是forward页面之间进行导航。改为使用sendRedirect。更多的信息在这里：http://www.javapractices.com/topic/TopicAction.do?Id=181