SpringMVC4零配置--应用上下文配置【AppConfig】

从spring3.0开始，Spring将JavaConfig整合到核心模块，普通的POJO只需要标注@Configuration注解，就可以成为spring配置类，并通过在方法上标注@Bean注解的方式注入bean。

Xml配置和Java类配置对比如下：

applicationContext-AppConfig.xml

** ****AppConfig.java**

@Configuration  
@ComponentScan(basePackages = "web.function", excludeFilters = { @ComponentScan.Filter(type = FilterType.ANNOTATION, value = { Controller.class }) })  
@EnableAspectJAutoProxy(proxyTargetClass=true)  
@Import({CachingConfig.class,DaoConfig.class})  
public class AppConfig {  
}  

applicationContext-CachingConfig.xml

**CachingConfig.java**** **

@Configuration  
@EnableCaching//   
public class CachingConfig {  
    private static final Logger logger = Logger.getLogger(CachingConfig.class);  
  
  
    @Bean  
    public EhCacheManagerFactoryBean ehCacheManagerFactoryBean() {  
        EhCacheManagerFactoryBean ehCacheManagerFactoryBean = new EhCacheManagerFactoryBean();  
        ehCacheManagerFactoryBean.setConfigLocation(new ClassPathResource(  
                "config/ehcache.xml"));  
        return ehCacheManagerFactoryBean;  
    }  
  
    @Bean  
    public CacheManager cacheManager() {  
        logger.info("EhCacheCacheManager");  
        EhCacheCacheManager cacheManager = new EhCacheCacheManager();  
        cacheManager.setCacheManager(ehCacheManagerFactoryBean().getObject());  
        return cacheManager;  
    }  
}  

applicationContext-DaoConfig.xml

  
 
     
     
         
         
             
               web.function.**.model.oracle  
             
         
         
             
                 
                   ${hibernate.dialect}  
                 
               ${hibernate.show_sql}  
               org.springframework.orm.hibernate4.SpringSessionContext  
             
         
     
 
     
     
     
       
     
       
     
     
         
     
     
     
     

##**DaoConfig.java**

@Configuration
//启用注解事务管理，使用CGLib代理
@EnableTransactionManagement(proxyTargetClass = true)
@Import({DataSourceConfig.class})
public class DaoConfig {
private static final Logger logger = Logger.getLogger(DaoConfig.class);

@Value("${hibernate.dialect}")  
String hibernate_dialect;  
@Value("${hibernate.show_sql}")  
String hibernate_show_sql;  
  
/**                                                           
* 描述 : <负责解析资源文件>. 
  
*
  
    <这个类必须有，而且必须声明为static，否则不能正常解析>   
 
                                                                                                                                                                                                                                                 
* @return                                                                                                       
*/    
@Bean  
public static PropertySourcesPlaceholderConfigurer placehodlerConfigurer() {  
    logger.info("PropertySourcesPlaceholderConfigurer");  
    return new PropertySourcesPlaceholderConfigurer();  
}  
  
@Resource(name="dataSource")  
public DataSource dataSource;  

  

@Bean(name = "sessionFactory")  
public LocalSessionFactoryBean localSessionFactoryBean() {  
    logger.info("sessionFactory");  
    LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();  
    sessionFactory.setDataSource(dataSource);  
    String[] packagesToScan = new String[] { "web.function.**.model.oracle" };  
    sessionFactory.setPackagesToScan(packagesToScan);  

    Properties hibernateProperties = new Properties();  
    hibernateProperties.setProperty("hibernate.dialect", hibernate_dialect);  
    hibernateProperties.setProperty("hibernate.show_sql",  
            hibernate_show_sql);  
    hibernateProperties.setProperty(  
            "hibernate.current_session_context_class",  
            "org.springframework.orm.hibernate4.SpringSessionContext");  
    sessionFactory.setHibernateProperties(hibernateProperties);  

    return sessionFactory;  

}  

@Bean(name = "hibernateDAO")  
public CP_Hibernate4DAOImpl hibernate4Dao() {  
    logger.info("hibernateDAO");  
    CP_Hibernate4DAOImpl dao = new CP_Hibernate4DAOImpl();  
    dao.setSessionFactory(localSessionFactoryBean().getObject());  
    return dao;  
}  

@Bean(name = "transactionManager")  
public HibernateTransactionManager hibernateTransactionManager() {  
    logger.info("transactionManager");  
    HibernateTransactionManager hibernateTransactionManager = new HibernateTransactionManager();  
    hibernateTransactionManager.setSessionFactory(localSessionFactoryBean()  
            .getObject());  
    return hibernateTransactionManager;  
}  

}

 
##**applicationContext-DataSourceConfig.xml**

location="classpath:/config/properties/db.properties" />

 
##**DataSourceConfig.java**

@Configuration
//加载资源文件
@PropertySource({"classpath:/config/properties/db.properties"})
public class DataSourceConfig {
private static final Logger logger = Logger.getLogger(DataSourceConfig.class);
/*
* 绑定资源属性
*/
@Value("${jdbc.driver}")
String driverClass;
@Value("${jdbc.url}")
String url;
@Value("${jdbc.username}")
String userName;
@Value("${jdbc.password}")
String passWord;

@Bean(name = "dataSource")  
public DataSource dataSource() {  
    logger.info("DataSource");  
    DriverManagerDataSource dataSource = new DriverManagerDataSource();  
    dataSource.setDriverClassName(driverClass);  
    dataSource.setUrl(url);  
    dataSource.setUsername(userName);  
    dataSource.setPassword(passWord);  
    return dataSource;  
}  

}

 
##DataSource如果使用JNDI的方式如下：

##Java类配置：

@Bean
public JndiObjectFactoryBean jndiObjectFactoryBean(){
JndiObjectFactoryBean factory = new JndiObjectFactoryBean();
// factory.setJndiName("java:comp/env/jdbc/demoDB"); //两种方式均可，spring会自动补齐
factory.setJndiName("jdbc/demoDB");
return factory;
}

@Bean(name = "dataSource")  
public DataSource dataSource() throws Exception{  
    logger.info("DataSourceJNDI");  
    return (DataSource)jndiObjectFactoryBean().getObject();  
      
}