【转】BeanFactoryAware的使用

 

文章来源：http://cczakai.iteye.com/blog/1674776

 

使用ClassPathXmlApplicationContext 加载bean.xml文件才能将实现BeanFactoryAware接口的bean的BeanFactory注入进去。

 

 

 

spring的IoC容器核心为BeanFactory接口，该接口的最常用实现是XmlBeanFactory类，该类使用xml配置文件来初始化一个BeanFactory实例。

 

ApplicationContext是对BeanFactory接口的扩展，在大多数的应用中，使用ApplicationContext的优先级要高于BeanFactory，两者对比如下：

 

 

 

 

 

特性	BeanFactory	ApplicationContext
Bean 实例化/装配	Yes	Yes
自动 BeanPostProcessor 注册	No	Yes
自动 BeanFactoryPostProcessor 注册	No	Yes
便捷的 MessageSource 访问( i18n)	No	Yes
ApplicationEvent 发送	No	Yes

 

 

 

package com.cc.bsp.persistence.dao.hibernate.expand.namedql.content;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;

import com.cc.bsp.persistence.dao.hibernate.expand.namedql.builder.DynamicHibernateStatementBuilder;
import com.cc.bsp.persistence.exception.NamedQLException;
import com.cc.bsp.persistence.exception.PersistenceException;

public class NamedQLContent implements BeanFactoryAware{

private static final Logger LOGGER = LoggerFactory.getLogger(NamedQLContent.class );

private static Map<String, String> namedHQLQueries = new HashMap<String, String>();

private static Map<String, String> namedSQLQueries = new HashMap<String, String>();

private static BeanFactory beanFactory = null;

private DynamicHibernateStatementBuilder hibernateStatementBuilder = null;

private static NamedQLContent instance = null;

private NamedQLContent(){

}

public static NamedQLContent getInstance(){
if(instance ==null){
instance = (NamedQLContent) beanFactory.getBean("namedQLContent");
instance.initialize();
}
return instance;
}

private DynamicHibernateStatementBuilder getHibernateStatementBuilder() {
return hibernateStatementBuilder;
}

public void setHibernateStatementBuilder(
DynamicHibernateStatementBuilder hibernateStatementBuilder) {
this.hibernateStatementBuilder = hibernateStatementBuilder;
}


public void reload(){
try {
getHibernateStatementBuilder().init();
namedHQLQueries.clear();
namedSQLQueries.clear();
Map<String, String> tempHQL = getHibernateStatementBuilder().getNamedHQLQueries();
Map<String, String> tempSQL = getHibernateStatementBuilder().getNamedSQLQueries();
namedHQLQueries.putAll(tempHQL);
namedSQLQueries.putAll(tempSQL);
} catch (IOException e) {
e.printStackTrace();
LOGGER.error(e.getMessage());
} catch (NamedQLException e) {
e.printStackTrace();
LOGGER.error(e.getMessage());
}
}

public void initialize() {
Map<String, String> tempHQL = getHibernateStatementBuilder().getNamedHQLQueries();
Map<String, String> tempSQL = getHibernateStatementBuilder().getNamedSQLQueries();
namedHQLQueries.putAll(tempHQL);
namedSQLQueries.putAll(tempSQL);
}

public void addHQL(String sqlName, String sqlstr)
throws PersistenceException {

if (namedHQLQueries.containsKey(sqlName)) {
throw new PersistenceException("sqlName is exits");
}

namedHQLQueries.put(sqlName, sqlstr);
}

public void addSQL(String sqlName, String sqlstr)
throws PersistenceException {
if (namedSQLQueries.containsKey(sqlName)) {
throw new PersistenceException("sqlName is exits");
}
namedSQLQueries.put(sqlName, sqlstr);
}

public String getHQL(String sqlName){
return namedHQLQueries.get(sqlName);
}

public String getSQL(String sqlName){
return namedSQLQueries.get(sqlName);
}

@SuppressWarnings("static-access")
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}

}

 

 

 

<bean id="namedQLContent" class="com.cc.bsp.persistence.dao.hibernate.expand.namedql.content.NamedQLContent" scope="singleton">
		<property name="hibernateStatementBuilder" ref="hibernateStatementBuilder"></property>
</bean>