SessionFactory的getCurrencSesion不能與自動裝配Autowired

Question

我想用Hibernate SessionFactory的的使用Spring的工作（之前我是手工完成的） 但我不能在簡單的例子 連接到Oracle使用的SessionFactory是OK：

Jan 01, 2015 5:29:21 PM org.hibernate.tool.hbm2ddl.SchemaUpdate execute 
INFO: HHH000232: Schema update complete 

也行事務管理：

Jan 01, 2015 5:29:21 PM org.springframework.orm.hibernate4.HibernateTransactionManager afterPropertiesSet 
INFO: Using DataSource [org.apache.tomcat.dbcp.dbcp.BasicDataSource@c5fac0] of Hibernate SessionFactory for HibernateTransactionManager 

但是，當我試圖讓的getCurrentSession（），使用

SessionTest sessionTest = new SessionTest(); 
System.out.println("getSessionFactory() " + sessionTest.getSession()); 

有錯誤：

SEVERE: Servlet.service() for servlet [dispatcher] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause 
java.lang.NullPointerException 
    at test.SessionTest.getSession(SessionTest.java:17) 
    at controller.Test.index(Test.java:25) 

我認爲，自動裝配Autowired不工作test.SessionTest.java

的web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"> 
    <servlet> 
     <servlet-name>dispatcher</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <load-on-startup>1</load-on-startup> 
    </servlet> 
    <servlet-mapping> 
     <servlet-name>dispatcher</servlet-name> 
     <url-pattern>/test/</url-pattern> 
    </servlet-mapping> 

<listener> 
    <listener-class> 
     org.springframework.web.context.ContextLoaderListener 
    </listener-class> 
</listener> 
</web-app> 

調度-servlet.xml中

<?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:task="http://www.springframework.org/schema/task" 
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
    xsi:schemaLocation="http://www.springframework.org/schema/task 
    http://www.springframework.org/schema/task/spring-task-3.0.xsd 
      http://www.springframework.org/schema/beans 
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
      http://www.springframework.org/schema/tx 
     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
      http://www.springframework.org/schema/context 
      http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 

    <context:component-scan base-package="controller" /> 

    <bean 
     class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <property name="prefix" value="/WEB-INF/jsp/"></property> 
     <property name="suffix" value=".jsp"></property> 
    </bean> 

</beans> 

的applicationContext.xml

<?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:task="http://www.springframework.org/schema/task" 
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
    xsi:schemaLocation="http://www.springframework.org/schema/task 
    http://www.springframework.org/schema/task/spring-task-3.0.xsd 
      http://www.springframework.org/schema/beans 
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
      http://www.springframework.org/schema/tx 
     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
      http://www.springframework.org/schema/context 
      http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 

    <bean id="sessionFactory" 
     class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> 

     <property name="dataSource" ref="dataSource" /> 
     <property name="annotatedClasses"> 
      <list> 
       <value>test.SessionTest</value> 

      </list> 
     </property> 
     <property name="hibernateProperties"> 
      <props> 
       <prop key="hibernate.hbm2ddl.auto">update</prop> 
       <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop> 
       <prop key="hibernate.globally_quoted_identifiers">true</prop> 


      </props> 
     </property> 

    </bean> 

    <bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource"> 
     <property name="driverClassName" value="oracle.jdbc.OracleDriver" /> 
     <property name="url" 
      value="jdbc:oracle:thin:@my.adgawegaw.us-east-1.rds.amazonaws.com:1521:ORCL" /> 
     <property name="username" value="*****" /> 
     <property name="password" value="*****" /> 

    </bean> 


    <bean id="transactionManager" 
     class="org.springframework.orm.hibernate4.HibernateTransactionManager"> 
     <property name="sessionFactory" ref="sessionFactory" /> 
    </bean> 
</beans> 

test.SessionTest.java

package test; 

import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Repository; 

@Repository 
public class SessionTest { 

    @Autowired 
    private SessionFactory sessionFactory; 

    public void setSessionFactory(SessionFactory sessionFactory) { 
     this.sessionFactory = sessionFactory; 
    } 

    public Session getSession() { 
     return sessionFactory.getCurrentSession(); 
    } 

    public SessionTest() { 
     System.out.println("Test created!"); 
    } 

} 

controller.Test.java

package controller; 

import org.springframework.stereotype.Controller; 
import org.springframework.ui.Model; 
import org.springframework.ui.ModelMap; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.servlet.ModelAndView; 

import test.SessionTest; 

@Controller 
public class Test { 

    @RequestMapping("/test/") 
    public ModelAndView index(// 
      ModelMap map, Model m // 
    ) { 


     ModelAndView mav = new ModelAndView(); 
     mav.setViewName("test"); 


     SessionTest sessionTest = new SessionTest(); 
     System.out.println("getSessionFactory() " + sessionTest.getSession()); 


     return mav; 
    } 

} 

Answer 1

春季汽車連接它控制和實例化的bean實例。它不會自動裝載您自己創建的對象。當你做

new SessionTest(); 

你不問春天的豆。你自己創建一個普通的舊Java對象，而Spring不知道它，因此沒有辦法自動調用這個對象的依賴關係。

而不是創建SessionTest對象，你應該從Spring中獲取它。而且，由於春天是實例在您使用SessionTest控制器中的一個，就可以自動裝配SessionTest控制器內部：

@Controller 
public class Test { 

    @Autowired 
    private SessionTest sessionTest; 

    @RequestMapping("/test/") 
    public ModelAndView index(ModelMap map, Model m) { 
     System.out.println("getSession() " + sessionTest.getSession()); 
     ... 
    } 
}