Spring InitializingBean和init-method
来源:互联网 发布:最后的朋友 知乎 编辑:程序博客网 时间:2024/05/16 18:09
<一>
<三>
initializingBean接口是spring提供的,子类要实现afterPropertiesSet()方法,init-method是用户可以通过属性文件配置的。从这里可以看出实现initializingBean接口是要和spring耦合的,而init-method则不会。但afterPropertiesSet()方法spring可以直接调用执行,init-method指定的方法却需要通过反射来执行,从效率来上讲没有afgerPropertiesSet()快。InitializingBean和init-method可以一起使用,Spring会先处理InitializingBean再处理init-method。
下面是一个小例子,initializingBean接口和init-method都实现了,可以自己随便改。
试验用的bean:
package researchspring.beanfactory;
import org.springframework.beans.factory.InitializingBean;
public class LifeCycleBean implements InitializingBean{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void afterPropertiesSet() throws Exception {
System.out.println("Implements initializing start.....");
if(name == null)
System.out.println("configuration failed!");
System.out.println("Implements initializing end!");
}
public void init() {
System.out.println("init() initializing start.....");
if(name == null)
System.out.println("configuration failed!");
System.out.println("init() initializing end!");
}
}
applicationContext.xml
< ?xml version="1.0" encoding="UTF-8"?>
< beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
<bean id="lifeBean" class="researchspring.beanfactory.LifeCycleBean"
init-method="init" >
<property name="name" value="apple"></property>
</bean>
< /beans>
测试类:
public class Test {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
LifeCycleBean lifeBean = (LifeCycleBean)ac.getBean("lifeBean");
}
}
×××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××
另外,从网上找了这么一段
下面是一个小例子,initializingBean接口和init-method都实现了,可以自己随便改。
试验用的bean:
package researchspring.beanfactory;
import org.springframework.beans.factory.InitializingBean;
public class LifeCycleBean implements InitializingBean{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void afterPropertiesSet() throws Exception {
System.out.println("Implements initializing start.....");
if(name == null)
System.out.println("configuration failed!");
System.out.println("Implements initializing end!");
}
public void init() {
System.out.println("init() initializing start.....");
if(name == null)
System.out.println("configuration failed!");
System.out.println("init() initializing end!");
}
}
applicationContext.xml
< ?xml version="1.0" encoding="UTF-8"?>
< beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
<bean id="lifeBean" class="researchspring.beanfactory.LifeCycleBean"
init-method="init" >
<property name="name" value="apple"></property>
</bean>
< /beans>
测试类:
public class Test {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
LifeCycleBean lifeBean = (LifeCycleBean)ac.getBean("lifeBean");
}
}
×××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××
另外,从网上找了这么一段
org.springframework.beans.factory.support. AbstractAutowireCapableBeanFactory完成一个Bean初始化方法的调用工作。 AbstractAutowireCapableBeanFactory是XmlBeanFactory的超类,再 AbstractAutowireCapableBeanFactory的invokeInitMethods方法中实现调用一个Bean初始化方法:
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java:
//……//在一个bean的合作者设备完成后,执行一个bean的初始化方法。protected void invokeInitMethods(String beanName, Object bean, RootBeanDefinition mergedBeanDefinition) throws Throwable {//判断bean是否实现了InitializingBean接口if (bean instanceof InitializingBean) {if (logger.isDebugEnabled()) {logger.debug("Invoking afterPropertiesSet() on bean with name '" + beanName + "'");}//调用afterPropertiesSet方法((InitializingBean) bean).afterPropertiesSet();}//判断bean是否定义了init-methodif(mergedBeanDefinition!=null&&mergedBeanDefinition.getInitMethodName() != null) {//调用invokeCustomInitMethod方法来执行init-method定义的方法invokeCustomInitMethod(beanName, bean, mergedBeanDefinition.getInitMethodName());}}//执行一个bean定义的init-method方法protected void invokeCustomInitMethod(String beanName, Object bean, String initMethodName)throws Throwable {if (logger.isDebugEnabled()) {logger.debug("Invoking custom init method '" + initMethodName +"' on bean with name '" + beanName + "'");}//使用方法名,反射Method对象Method initMethod = BeanUtils.findMethod(bean.getClass(), initMethodName, null);if (initMethod == null) {throw new NoSuchMethodException("Couldn't find an init method named '" + initMethodName + "' on bean with name '" + beanName + "'");}//判断方法是否是publicif (!Modifier.isPublic(initMethod.getModifiers())) {//设置accessible为true,可以访问private方法。 initMethod.setAccessible(true);}try {//反射执行这个方法initMethod.invoke(bean, (Object[]) null);}catch (InvocationTargetException ex) {throw ex.getTargetException();}}//………..转自:http://blog.csdn.net/shaozheng1006/article/details/6916940
0 0
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring InitializingBean和init-method
- Spring的InitializingBean和init-method
- Spring的InitializingBean和init-method
- Spring的InitializingBean和init-method
- Spring的InitializingBean和init-method
- 浅谈Spring的InitializingBean和init-method
- Spring的InitializingBean和init-method
- InitializingBean和init-method
- spring InitializingBean and init-method
- spring-InitializingBean init-method postConstruct
- spring initializingBean vs init-method && 自动装配
- 1 pydicom使用体验
- 八皇后算法
- 每天一个 Linux 命令(33):df 命令
- The "Double-Checked Locking is Broken" Declaration
- 深入理解maven及应用
- Spring InitializingBean和init-method
- 在弧上绘制圆点
- 使用Visual Studio(VS2015)编译自己的GVIM 8.0
- QML model-veiw 元素之间间隔控制
- 高效的VS调试技巧
- openssl rsa公钥验签名
- 安卓mvc模式
- 新手使用React时遇到的问题整理<一>
- 分清url 域名和服务器名