Question

我想在我的项目中使用基于xml的配置进行spring-hibernate配置。当打印sessionFactory对象时，它应该返回一个像某个内存地址的值，但是它给出了null值。

我想使用@Autowire注释在bean中注入sessionFactory。我将使用hibernate托管交易。

我的代码是

spring-config.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:tx="http://www.springframework.org/schema/tx"
   xmlns:context="http://www.springframework.org/schema/context"
   xsi:schemaLocation=   
    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＆＃34; ＆GT;

<context:annotation-config />

<context:property-placeholder location="classpath:application.properties" />
<bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource"
    destroy-method="close">
    <property name="driverClassName" value="${database.driverClassName}" />
    <property name="url" value="${database.url}" />
    <property name="username" value="${database.username}" />
    <property name="password" value="${database.password}" />       
</bean>

 <bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}
   </prop>
            <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
        </props>
    </property>

   </bean>
    <bean id="abc" class="pkg.A"/>

</beans>

这是我的界面

Abc.java

package pkg;

public interface Abc {
  public void m1();

}

界面实施

A.java

            package pkg;    

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

            @Repository
            public class A implements Abc {

                @Autowired
                SessionFactory sessionFactory;



                public SessionFactory getSessionFactory() {
                    System.out.println("sys factory : "+sessionFactory);
                    return sessionFactory;
                }



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



                public void m1() {
                    System.out.println("session factory  obj : "+sessionFactory);

                }

            }

它给我null

tomcat输出：

            Jul 21, 2017 8:38:47 PM org.springframework.web.context.ContextLoader initWebApplicationContext
            INFO: Root WebApplicationContext: initialization completed in 9610 ms
            Jul 21, 2017 8:38:47 PM org.apache.coyote.AbstractProtocol start
            INFO: Starting ProtocolHandler ["http-nio-8082"]
            Jul 21, 2017 8:38:47 PM org.apache.coyote.AbstractProtocol start
            INFO: Starting ProtocolHandler ["ajp-nio-8011"]
            Jul 21, 2017 8:38:47 PM org.apache.catalina.startup.Catalina start
            INFO: Server startup in 24169 ms
            session factory obj : null

这是我正在调用sessionfactory对象的jsp文件，如

                <%@page import="pkg.A"%>
            <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
                pageEncoding="ISO-8859-1"%>
            <!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">
            <title>Insert title here</title>
            </head>
            <body>

            <h2>H2 heading</h2>

            <%

            A a = new A();
            a.m1();

            %>
            </body>
            </html>

Answer 1

您忘记将<context:component-scan base-package="pkg"/>添加到spring-config.xml

Answer 2

在对依赖注入进行一些研究之后，我得到了答案

首先我的配置是正确的..问题出在我所遵循的方法中......按照春天的说法，你的应用程序应该松散地耦合到bean的注入依赖。对于松耦合接口应该使用。在bean中自动连接这些接口之后，spring会自动将依赖项添加到bean

中

sessionfactory总是在Spring基于hibernate xml的配置

2 个答案: