Question

我想使用Hibernate将数据从JSP插入MySQL但是无法获得会话工厂的对象。

我成功创建了Hibernate util类的对象，但在获取数据时显示错误。

当我在JSP页面中输入数据并在DAO层中获取数据时。但在DAO层，我正在扩展会话工厂类。但我无法完成任务。

（Struts动作类）

package org.sachin.action;

import java.util.List;

import org.sachin.hibernate.AdminCreate;
import org.sachin.hibernate.AdminManager;   

import com.opensymphony.xwork2.ActionSupport;


public class Addad extends ActionSupport {

private AdminCreate admincreate;
private List<AdminCreate> adminList;
private Long id;

   AdminManager adminmanager;
   public Addad() {
       AdminManager   adminmanager=new AdminManager();
   }

   public String execute() {
       return SUCCESS;
   }

public String add() {
      AdminManager adm=new AdminManager();
       System.out.println(getadmin());
       try {
           adm.add(getadmin());
       } catch (Exception e) {
           e.printStackTrace();
       }
       return SUCCESS;
   }

   public AdminCreate getadmin() {
       return admincreate;
   }

   public List<AdminCreate> getadminList() {
       return adminList;
   }

   public void setadmin(AdminCreate adminCreate) {
       this.admincreate = adminCreate;
   }

   public void setadminList(List<AdminCreate> adminList) {
       this.adminList = adminList;
   }

   public Long getId() {
       return id;
   }

   public void setId(Long id) {
       this.id = id;
   }
}

（Hibernate实用程序类）

package org.sachin.hibernate;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            return new AnnotationConfiguration().configure()
                    .buildSessionFactory();
        } catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}

（DAO班）

package org.sachin.hibernate;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.classic.Session;

public class AdminManager extends HibernateUtil {
    public  AdminCreate add(AdminCreate admincreate) {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        session.save(admincreate);
        session.getTransaction().commit();
        return admincreate;
    }

    public List<AdminCreate> list() {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        List<AdminCreate> admin = null;
        try {
            admin = (List<AdminCreate>)session.createQuery("from admin").list();
        } catch (HibernateException e) {
            e.printStackTrace();
            session.getTransaction().rollback();
        }
        session.getTransaction().commit();
        return admin;
    }
}

（获取数据）
JSP页面：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
     <%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link rel="stylesheet" type="text/css" href="NewFile.css">
<title>Edit Details</title>
<script type="text/javascript" src="/javascript/confirm.js">
</script>
</head>
<body>
<center><div style="color:#FF0000: #FF0000; border-radius: 5px 5px 0px 0px; padding: 15px;"><span style="font-family: verdana,arial; color: #FF0000; font-size: 2.00em; font-weight:bold;">Edit Details<br><br> </span></div></center>

<s:form action="/tut/admincreate" id="login" onsubmit="return confirm()">
<s:textfield label="UserName:" name="admincreate.username"></s:textfield>
<s:textfield label="Firstname:" name="admincreate.firstname"></s:textfield>
<s:textfield label="LastName:" name="admincreate.lastname"></s:textfield>
<s:password label="Password:" ID="password"  name="admincreate.password"></s:password>
<!--<s:password label="Confirm Password:" ID="cpassword" name="cpassword" key="admincreate.cpassword"></s:password>-->
<s:submit value="Change My Details"></s:submit>

</s:form>

</body>
</html>

Answer 1

当您尝试执行任务时，是否收到标题中提到的ClassNotFoundException？如果是这样，那么您可能正在使用旧版本的struts2。在struts-version 2.1.3之前我们使用的是

org.apache.struts2.dispatcher.FilterDispatcher

而不是

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

自struts-version 2.1.3。

以来，FilterDispatcher已被弃用

Answer 2

WEB-INF / lib下可能没有struts库。尝试手动复制最小的jar或configure eclipse to autodeploy jars将库添加为：

Project property->DeploymentAssembly->Add .

java.lang.ClassNotFoundException：org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter）

2 个答案: