实现ApplicationContextAware接口,实现setApplicationContext方法,就可以在程序中获取bean的一些基本信息。
1.1 实现ApplicationContextAware接口的工具类定义
package com.test.utils; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; /** * Created by yangjianzhou on 7/2/15. */ @Component public class SpringContextUtil implements ApplicationContextAware { private static ApplicationContext applicationContext; /** * 实现ApplicationContextAware接口的回调方法,设置上下文环境 * * @param applicationContext * @throws BeansException */ public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { SpringContextUtil.applicationContext = applicationContext; } /** * @return ApplicationContext */ public static ApplicationContext getApplicationContext() { return applicationContext; } /** * 获取对象 * * @param name * @return Object 一个以所给名字注册的bean的实例 * @throws BeansException */ public static Object getBean(String name) throws BeansException { return applicationContext.getBean(name); } /** * 获取对象 * * @param beanClass * @return Object 一个以所给名字注册的bean的实例 * @throws BeansException */ public static Object getBean(Class<?> beanClass) throws BeansException { return applicationContext.getBean(beanClass); } /** * 获取类型为requiredType的对象 * 如果bean不能被类型转换,相应的异常将会被抛出(BeanNotOfRequiredTypeException) * * @param name * bean注册名 * @param requiredType * 返回对象类型 * @return Object 返回requiredType类型对象 * @throws BeansException */ public static Object getBean(String name, Class<?> requiredType) throws BeansException { return applicationContext.getBean(name, requiredType); } /** * 如果BeanFactory包含一个与所给名称匹配的bean定义,则返回true * * @param name * @return boolean */ public static boolean containsBean(String name) { return applicationContext.containsBean(name); } /** * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 * 如果与给定名字相应的bean定义没有被找到,将会抛出一个异常(NoSuchBeanDefinitionException) * * @param name * @return boolean * @throws NoSuchBeanDefinitionException */ public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException { return applicationContext.isSingleton(name); } /** * @param name * @return Class 注册对象的类型 * @throws NoSuchBeanDefinitionException */ public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { return applicationContext.getType(name); } /** * 如果给定的bean名字在bean定义中有别名,则返回这些别名 * * @param name * @return 别名数组 * @throws NoSuchBeanDefinitionException */ public static String[] getAliases(String name) throws NoSuchBeanDefinitionException { return applicationContext.getAliases(name); } }
1.2 定义bean
package com.test.domain; /** * Created by yangjianzhou on 9/22/15. */ public class UserInfo { private String name ; private String password ; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
1.3 在XML中声明Bean
<bean id="userInfo" class="com.test.domain.UserInfo"> <property name="name" value="yangjianzhou"/> <property name="password" value="123456"/> </bean>
1.4 获取bean的基本信息
UserInfo userInfo = (UserInfo)SpringContextUtil.getBean("userInfo"); System.out.println(userInfo.getName());
2.InitializingBean的使用
实现InitializingBean接口,实现afterPropertiesSet方法,可以对bean的属性进行改变
2.1实现类
package com.test.domain; import org.springframework.beans.factory.InitializingBean; /** * Created by yangjianzhou on 9/22/15. */ public class UserInfo implements InitializingBean{ private String name ; private String password ; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public void afterPropertiesSet() throws Exception { this.name = "dbuser"; } }
2.2 xml中定义Bean
<bean id="userInfo" class="com.test.domain.UserInfo"> <property name="name" value="yangjianzhou"/> <property name="password" value="123456"/> </bean>
2.3 测试
UserInfo userInfo = (UserInfo)SpringContextUtil.getBean("userInfo"); System.out.println(userInfo.getName());
3.TransactionSynchronizationManager的使用
在本事务结束之后开启一个事务,一般用一个异步线程开启一个事物,这样就不至于阻塞主线程
tradeRecordDao.queryById(0l); TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronizationAdapter() { @Override public void afterCommit() { asyncEventBus.post(new FundSettleEvent(settleId)); } });
4.在java代码和XML文件中声明Bean,则只使用XML中的Bean
4.1 java代码中声明Bean
package com.test.domain; import org.springframework.stereotype.Component; /** * Created by yangjianzhou on 9/22/15. */ @Component public class UserInfo { private String name ; private String password ; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
4.2 xml中声明Bean
<bean id="userInfo" class="com.test.domain.UserInfo"> <property name="name" value="yangjianzhou"/> <property name="password" value="123456"/> </bean>