Spring整合Hibernate注入报空指针

[GIS的粉刷匠]

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
<context:component-scan base-package="com.jzh"/>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mappingResources">
<list>
<value>com/jzh/model/User.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>



</beans>
**********************************************
package com.jzh.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

import com.jzh.dao.UserDAO;
import com.jzh.model.User;


@Component("userManager")
public class UserManager {
private UserDAO userDAO;


public UserDAO getUserDAO() {//此处得不到userDAO

return userDAO;
}

@Resource(name="userDAO")
public void setUserDAO(UserDAO userDAO) {//但set可以得到
this.userDAO = userDAO;
}


public void saves(User user)
{
userDAO.save(user);//此处空指针

}

}
******************************************************************
package com.jzh.dao;

import javax.annotation.Resource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.springframework.stereotype.Component;

import com.jzh.model.User;



@Component("userDAO")
public class UserDAO {

private SessionFactory sessionFactory;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
@Resource
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
public void save(User user)
{
Session session=sessionFactory.getCurrentSession();
Transaction tr=session.beginTransaction();
session.save(user);
tr.commit();
}

}

[GIS的粉刷匠]

加到属性上和set方法上是一样的，都报同样的错

[GIS的粉刷匠]

难道就没人知道？？？？

[zlamnz]

有没错误信息啊，贴出来啊

[宏Lee]

他你的测试类贴出来

[GIS的粉刷匠]

import java.sql.SQLException;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.jzh.model.User;
import com.jzh.service.UserManager;

public class UserManagerTest {

@Test
public void save() throws SQLException
{
ClassPathXmlApplicationContext cxa=new ClassPathXmlApplicationContext("beans.xml");
UserManager um=new UserManager();
User user=new User();
user.setAge(20);
user.setName("10");
um.saves(user);
}

}

[GIS的粉刷匠]

就提示在调用userDAO.save(user);这个方法是出现空指针

[brightyq]

用spring了，你这里UserManager ，User 对象就不能采有new的方式了，要从spring容器中拿对应对象实例才对。

[GIS的粉刷匠]

楼上别学太死了，我只是单元测试一下

[forever_kimi]

成员变量userDao这里标注@Resource(name='userDao'),你标注错了。

[GIS的粉刷匠]

不好意思，是我错了，8楼正解。。。。。。。

[z443122251]

怎么从spring容器中拿对应对象实例? 楼主好人 遇到跟你一样的问题了 求方法

[niuchaobo2012]

引用 11 楼 z443122251 的回复:

怎么从spring容器中拿对应对象实例? 楼主好人 遇到跟你一样的问题了 求方法

ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); Object obj = ac.getBean("beanName");