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| 懒惰初始化演示 |
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/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/
///////////////////////////////////////////////////////////////////////////////////////
//File: lazy.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="destructiveBean" class="DestructiveBeanWithInterface">
<property name="filePath">
<value>c:/test.txt</value>
</property>
</bean>
<bean id="shutdownHook" class="ShutdownHookBean" lazy-init="false"/>
</beans>
///////////////////////////////////////////////////////////////////////////////////////
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class DestructiveBeanWithInterface implements InitializingBean,
DisposableBean {
private InputStream is = null;
public String filePath = null;
public void afterPropertiesSet() throws Exception {
System.out.println("Initializing Bean");
if (filePath == null) {
throw new IllegalArgumentException(
"You must specify the filePath property of " + DestructiveBean.class);
}
is = new FileInputStream(filePath);
}
public void destroy() {
System.out.println("Destroying Bean");
if (is != null) {
try {
is.close();
is = null;
} catch (IOException ex) {
System.err.println("WARN: An IOException occured"
+ " trying to close the InputStream");
}
}
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
public class ShutdownHookBean implements BeanFactoryAware,
Runnable {
private ConfigurableListableBeanFactory factory;
public void setBeanFactory(BeanFactory factory) throws BeansException {
if (factory instanceof ConfigurableListableBeanFactory) {
this.factory = (ConfigurableListableBeanFactory) factory;
Runtime.getRuntime().addShutdownHook(new Thread(this));
}
}
public void run() {
if (factory != null) {
System.out.println("Destroying Singletons");
factory.destroySingletons();
System.out.println("Singletons Destroyed");
}
}
}
///////////////////////////////////////////////////////////////////////////////////////
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class DestructiveBean implements InitializingBean {
private InputStream is = null;
public String filePath = null;
public void afterPropertiesSet() throws Exception {
System.out.println("Initializing Bean");
if (filePath == null) {
throw new IllegalArgumentException(
"You must specify the filePath property of " + DestructiveBean.class);
}
is = new FileInputStream(filePath);
}
public void destroy() {
System.out.println("Destroying Bean");
if (is != null) {
try {
is.close();
is = null;
} catch (IOException ex) {
System.err.println("WARN: An IOException occured"
+ " trying to close the InputStream");
}
}
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class LazyInitDemo {
public static void main(String[] args) {
ApplicationContext ctx = new FileSystemXmlApplicationContext(
"build/lazy.xml");
DestructiveBeanWithInterface bean = (DestructiveBeanWithInterface) ctx
.getBean("destructiveBean");
}
}
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 LazyInitDemo.zip( 1,200 k) |
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