applicationContext中只有一個bean
<bean id="testUnit" class="test.TestUnit" lazy-init="true">
</bean>

通過以下程式碼，進行測試。

		ApplicationContext context = new ClassPathXmlApplicationContext(
				new String[]{"test/applicationContext.xml"},true);

		// bean layz-init=true
		long startTime = System.currentTimeMillis();
		TestUnit testUnit = (TestUnit) context.getBean("testUnit", context
				.getType("testUnit"));
		System.out.println(System.currentTimeMillis()-startTime);

		// 使用new建立
		startTime = System.currentTimeMillis();
		testUnit = new TestUnit();
		System.out.println(System.currentTimeMillis()-startTime);

		// spring已經例項化bean，獲取。
		startTime = System.currentTimeMillis();
		testUnit = context.getBean("testUnit",TestUnit.class);
		System.out.println(System.currentTimeMillis()-startTime);
 

執行結果:

2010-8-4 14:09:13 org.springframework.context.support.AbstractApplicationContext prepareRefresh
資訊: Refreshing org[email protected]5ffb18: startup date [Wed Aug 04 14:09:13 CST 2010]; root of context hierarchy
2010-8-4 14:09:13 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
資訊: Loading XML bean definitions from class path resource [test/applicationContext.xml]
2010-8-4 14:09:13 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
資訊: Pre-instantiating singletons in org.s

[email protected]1d15445: defining beans [testUnit]; root of factory hierarchy
[b]16
0
0[/b]

以上可見，spring的beanFactory創造bean的用時，也是不少的。