Java 使用Spring MVC注入自动连线依赖项失败

我正试图用SPing做一个简单的应用程序，但我不断地遇到这个错误，我不明白为什么

我什么都试过了，甚至整个应用程序都是我们写的。我甚至不知道问题出在哪里

这是我得到的错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'blogPostController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.vst.blog.service.BlogService com.vst.blog.controller.BlogPostController.blogServiceImpl; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4689)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5155)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.vst.blog.service.BlogService com.vst.blog.controller.BlogPostController.blogServiceImpl; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 22 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 24 more

Jul 14, 2020 9:46:20 PM org.springframework.web.context.ContextLoader initWebApplicationContext
SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'blogPostController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.vst.blog.service.BlogService com.vst.blog.controller.BlogPostController.blogServiceImpl; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4689)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5155)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.vst.blog.service.BlogService com.vst.blog.controller.BlogPostController.blogServiceImpl; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 22 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 24 more

Jul 14, 2020 9:46:20 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener]
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'blogPostController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.vst.blog.service.BlogService com.vst.blog.controller.BlogPostController.blogServiceImpl; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4689)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5155)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1412)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1402)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.vst.blog.service.BlogService com.vst.blog.controller.BlogPostController.blogServiceImpl; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 22 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vst.blog.service.BlogService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 24 more

下面是给出问题的类（BlogPostController）

package com.vst.blog.controller；
导入org.jboss.logging.Logger；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.stereotype.Component；
导入org.springframework.stereotype.Controller；
导入org.springframework.web.bind.annotation.ModelAttribute；
导入org.springframework.web.bind.annotation.RequestMapping；
导入org.springframework.web.bind.annotation.RequestMethod；
导入org.springframework.web.servlet.ModelAndView；
导入com.vst.blog.model.BlogPost；
导入com.vst.blog.service.BlogService；
导入java.io.IOException；
导入java.sql.SQLException；
导入java.util.List；
导入javax.servlet.http.HttpServletRequest；
@控制器
公共类BlogPostControllerImpl{
专用静态最终记录器=记录器
.getLogger（BlogPostControllerImpl.class）；
@自动连线
BlogService blogServiceImpl；
BlogPostControllerImpl（）{}
@RequestMapping（value=“/”，method=RequestMethod.GET）
公共模型和视图索引（）{
返回新的ModelAndView（“重定向：/web inf/pages/index.jsp”）；
}
@请求映射（value=“/loadPosts”）
公共模型和视图列表帖子（模型和视图模型）引发IOException{
List listPosts=blogServiceImpl.selectBlogPostS（）；
model.addObject（“listPosts”，listPosts）；
model.setViewName（“post”）；
收益模型；
}
@RequestMapping（value=“/newPost”，method=RequestMethod.GET）
公共模型和视图newPost（模型和视图模型）{
BlogPost=新建BlogPost（）；
model.addObject（“post”，post）；
model.setViewName（“post_表单”）；
收益模型；
}
@RequestMapping（value=“/savePost”，method=RequestMethod.POST）
publicmodelandview savePost（@modeldattributeblogpost）引发SQLException{
如果（post.getBlog_id（）==0）{
blogServiceImpl.insertBlogPost（post）；
}否则{
blogServiceImpl.updateBlogPost（post）；
}
返回新的ModelAndView（“重定向：/loadAlbums”）；
}
@RequestMapping（value=“/editPost”，method=RequestMethod.GET）
公共模型和视图编辑帖子（HttpServletRequest）{
intpostid=Integer.parseInt（request.getParameter（“blog_id”）；
BlogPost=blogServiceImpl.选择BlogPostById（postId）；
ModelAndView模型=新的ModelAndView（“后期表单”）；
model.addObject（“post”，post）；
收益模型；
}
@RequestMapping（value=“/deletePost”，method=RequestMethod.GET）
公共模型和视图deletePost（HttpServletRequest请求）引发SQLException{
intpostid=Integer.parseInt（request.getParameter（“blog_id”）；
blogServiceImpl.deleteBlogPost（postId）；
返回新的ModelAndView（“重定向：/loadPosts”）；
}
}

这是类接口

package com.vst.blog.service;

import java.sql.SQLException;
import java.util.List;

import org.springframework.stereotype.Repository;

import com.vst.blog.model.BlogPost;

public interface BlogService {

    public void insertBlogPost(BlogPost post) throws SQLException;

    public BlogPost selectBlogPostById(int id);

    public List<BlogPost> selectBlogPostS();

    public void deleteBlogPost(int id) throws SQLException;
    
    public void updateBlogPost(BlogPost post) throws SQLException;
}

package com.vst.blog.service；
导入java.sql.SQLException；
导入java.util.List；
导入org.springframework.stereotype.Repository；
导入com.vst.blog.model.BlogPost；
公共接口博客服务{
公共void insertBlogPost（BlogPost）抛出SQLException；
公共BlogPost selectBlogPostById（int-id）；
公共列表selectBlogPostS（）；
public void deleteBlogPost（int-id）抛出SQLException；
公共void updateBlogPost（BlogPost）抛出SQLException；
}

以下是它的实施情况：

package com.vst.blog.service;

import java.sql.SQLException;
import java.util.List;

import javax.transaction.Transactional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.vst.blog.dao.BlogPostDao;
import com.vst.blog.dao.BlogPostDaoImpl;
import com.vst.blog.dao.BlogPostDaoImpl;
import com.vst.blog.model.BlogPost;

@Service
@Transactional
public class BlogServiceImpl implements BlogService {
    
    @Autowired
    private BlogPostDao postDao;
    
    public BlogServiceImpl () {
        //postDao = new BlogPostDaoImpl();
    }


    public void insertBlogPost(BlogPost post) throws SQLException {
        postDao.insertBlogPost(post);
    }

    public BlogPost selectBlogPostById(int id) {
        return postDao.selectBlogPostById(id);
    }

    public List<BlogPost> selectBlogPostS() {
        return postDao.selectBlogPostS();
    }


    public void deleteBlogPost(int id) throws SQLException {
        postDao.deleteBlogPost(id);
    }

    public void updateBlogPost(BlogPost post) throws SQLException{
        postDao.updateBlogPost(post);
    }

}

包com.vst.blog.service；
导入java.sql.SQLException；
导入java.util.List；
导入javax.transaction.Transactional；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.stereotype.Service；
导入com.vst.blog.dao.BlogPostDao；
导入com.vst.blog.dao.BlogPostDaoImpl；
导入com.vst.blog.dao.BlogPostDaoImpl；
导入com.vst.blog.model.BlogPost；
@服务
@交易的
公共类BlogServiceImpl实现BlogService{
@自动连线
私人博客postDao postDao；
公共BlogServiceImpl（）{
//postDao=新BlogPostDaoImpl（）；
}
public void insertBlogPost（BlogPost post）引发SQLException{
postDao.insertBlogPost（post）；
}
public BlogPost selectBlogPostById（int-id）{
返回postDao，选择blogpostbyid（id）；
}
公共列表selectBlogPostS（）{
返回postDao.selectBlogPostS（）；
}
public void deleteBlogPost（int-id）引发SQLException{
deleteBlogPost（id）；
}
public void updateBlogPost（BlogPost）引发SQLException{
postDao.updateBlogPost（post）；
}
}

这是DaoImpl

package com.vst.blog.dao;

import java.util.List;

import javax.transaction.Transactional;

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

import com.vst.blog.model.BlogPost;

@Service
@Transactional
public class BlogPostDaoImpl implements BlogPostDao {
    
    public BlogPostDaoImpl () {}

    @Autowired
    private SessionFactory sessionFactory;
    
    public void insertBlogPost(BlogPost post) {
        sessionFactory.getCurrentSession().saveOrUpdate(post);

    }

    public BlogPost selectBlogPostById(int id) {
        
        return (BlogPost) sessionFactory.getCurrentSession().get(
                BlogPost.class, id);
        

    }

    @SuppressWarnings("unchecked")
    public List<BlogPost> selectBlogPostS() {
        
        return sessionFactory.getCurrentSession().createQuery("from blog")
                .list();

    }


    public void deleteBlogPost(int id)  {
        BlogPost post = (BlogPost) sessionFactory.getCurrentSession().load(
                BlogPost.class, id);
        if (null != post) {
            this.sessionFactory.getCurrentSession().delete(post);
        }
        

    }


    public BlogPost updateBlogPost(BlogPost post)  {
        sessionFactory.getCurrentSession().update(post);
        return post;

    }

}

包com.vst.blog.dao；
导入java.util.List；
导入javax.transaction.Transactional；
导入org.hibernate.SessionFactory；
导入org.springframework.beans.factory.annotation.Autowired；
导入org.springframework.stereotype.Repository；
导入org.springframework.stereotype.Service；
导入com.vst.blog.model.BlogPost；
@服务
@交易的
公共类BlogPostDaoImpl实现BlogPostDao{
公共BlogPostDaoImpl（）{}
@自动连线
私人会话工厂会话工厂；
公共void insertBlogPost（BlogPost）{
sessionFactory.getCurrentSession（）.saveOrUpdate（post）；
}
public BlogPost selectBlogPostById（int-id）{
return（BlogPost）sessionFactory.getCurrentSession（）.get(
BlogPost.class，id）；
}
@抑制警告（“未选中”）
公共列表selectBlogPostS（）{
返回sessionFactory.getCurrentSession（）.createQuery（“从博客”）
.list（）；
}
公共void deleteBlogPost（内部id）{
BlogPost=（BlogPost



package com.vst.blog.dao;

import java.util.List;

import javax.transaction.Transactional;

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

import com.vst.blog.model.BlogPost;

@Service
@Transactional
public class BlogPostDaoImpl implements BlogPostDao {
    
    public BlogPostDaoImpl () {}

    @Autowired
    private SessionFactory sessionFactory;
    
    public void insertBlogPost(BlogPost post) {
        sessionFactory.getCurrentSession().saveOrUpdate(post);

    }

    public BlogPost selectBlogPostById(int id) {
        
        return (BlogPost) sessionFactory.getCurrentSession().get(
                BlogPost.class, id);
        

    }

    @SuppressWarnings("unchecked")
    public List<BlogPost> selectBlogPostS() {
        
        return sessionFactory.getCurrentSession().createQuery("from blog")
                .list();

    }


    public void deleteBlogPost(int id)  {
        BlogPost post = (BlogPost) sessionFactory.getCurrentSession().load(
                BlogPost.class, id);
        if (null != post) {
            this.sessionFactory.getCurrentSession().delete(post);
        }
        

    }


    public BlogPost updateBlogPost(BlogPost post)  {
        sessionFactory.getCurrentSession().update(post);
        return post;

    }

}



package com.vst.blog.dao;

import java.sql.SQLException;
import java.util.List;

import org.springframework.stereotype.Repository;

import com.vst.blog.model.*;

@Repository
public interface BlogPostDao {

    public void insertBlogPost(BlogPost post) throws SQLException;

    public BlogPost selectBlogPostById(int id);

    public List<BlogPost> selectBlogPostS();

    public void deleteBlogPost(int id) throws SQLException;
    
    public BlogPost updateBlogPost(BlogPost post) throws SQLException;
    
}






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

    <!-- Specifying base package of the Components like Controller, Service, 
        DAO -->
    <context:component-scan base-package="com.vst" />



    <!-- Getting Database properties -->
    <context:property-placeholder location="classpath:application.properties" />

    <mvc:annotation-driven />

    <!-- Specifying the Resource location to load JS, CSS, Images etc -->
    <mvc:resources mapping="/resources/**" location="/resources/" />

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

    <!-- DataSource -->
    <bean class="org.springframework.jdbc.datasource.DriverManagerDataSource"
        id="dataSource">
        <property name="driverClassName" value="${database.driver}"></property>
        <property name="url" value="${database.url}"></property>
        <property name="username" value="${database.user}"></property>
        <property name="password" value="${database.password}"></property>
    </bean>

    <!-- Hibernate SessionFactory -->
    <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>
        <property name="packagesToScan" value="com.vst.blog.model"></property>
    </bean>

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

    <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

    <context:component-scan base-package="com.VST" />

    <context:component-scan base-package="com.VST.blog.service" />
    <context:component-scan base-package="com.VST.blog.controller" />
    <context:component-scan base-package="com.VST.blog.dao" />

BlogService blogServiceImpl; 

BlogService blogService;