獲取bean對象的一個很實用的工具

當在某些類中無法通過@Autowired、@Resource這種注解的方式來創(chuàng)建bean時，我們首先可能想到可以通過加載配置文件的方式來獲取bean，但這種方式不僅繁瑣還容易因為路徑問題個中找不到配置文件，所以我找到了一個很實用的工具，可以在項目中添加如下工具類：

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringUtil implements ApplicationContextAware {

private static ApplicationContext applicationContext;

@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    if (SpringUtil.applicationContext == null) {
        SpringUtil.applicationContext = applicationContext;
    }
}

//獲取applicationContext
public static ApplicationContext getApplicationContext() {
    return applicationContext;
}

//通過name獲取 Bean.
public static Object getBean(String name) {
    ApplicationContext applicationContext = getApplicationContext();
    if(null != applicationContext) {
        return getApplicationContext().getBean(name);
    }
    return null;
}

//通過class獲取Bean.
public static <T> T getBean(Class<T> clazz) {
    return getApplicationContext().getBean(clazz);
}

//通過name,以及Clazz返回指定的Bean
public static <T> T getBean(String name, Class<T> clazz) {
    return getApplicationContext().getBean(name, clazz);
}

}

如想獲取配置文件中的sessionFactory對象
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="packagesToScan" value="com.kocla.market.gateway.entities"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
<!--<prop key="hibernate.hbm2ddl.auto">update</prop>-->
<prop key="hibernate.query.substitutions">true 'T', false 'F'</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.connection.url">${bei.hibernate.connection.url}</prop>
<prop key="hibernate.connection.driver_class">com.mysql.jdbc.Driver</prop>
<prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop>
</props>
</property>
</bean>

可以通過以上工具類來輕松獲取
SpringUtil.getBean("sessionFactory");