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在动不动就是SSH的年代,IOC,AOP不是啥新东东。Spring之所以庞大,是因为集成了太多太多的功能。 验证性的开发了一下,仅实现IOC、AOP、子容器简单实践一下。
当然了,必须以HelloWorld示例:
接口:
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public interface Hello { void sayHello(String name); } |
实现:
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@Singleton @Named("abc") public class Hello1Impl implements Hello { public void sayHello(String name) { System.out.println("Hello:" + name); } } |
测试:
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public static void main(String[] args) { BeanContainer container = BeanContainerFactory.getBeanContainer(); container.registerClass(Hello1Impl.class); Hello hello = container.getBeanByType(Hello.class); hello.sayHello("abc"); hello = container.getBeanByName("abc"); hello.sayHello("def"); } |
运行结果:
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Hello:abc Hello:def |
可以看到根据接口和命名访问都是没有问题的。
再来一个AOP的例子:
先写个拦截器:
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@Request public class InterceptorImpl implements InterceptorBefore, InterceptorAfter, InterceptorException { public void after(Object object, Method method, Object... args) { System.out.println(String.format("%s->after\n", method.getName())); } public void before(Object object, Method method, Object... args) { System.out.println(String.format("%s->before\n", method.getName())); } public void exception(Object object, Method method, Throwable throwable, Object... args) { System.out.println(String.format("%s->exception:%s\n", method.getName(), throwable.getMessage())); } } |
拦截点有前置,后置及异常,可以实现在一个类上,也可以实现在不同的类上。如果有状态的,则应该配成Prototype或Request类型,否则要考虑线程安全问题。
还是用前面的HelloImpl做测试:
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public static void main(String[] args) { BeanContainer container = BeanContainerFactory.getBeanContainer(); container.registerClass(InterceptorImpl.class); container.registerClass(HelloImpl.class); container.addAop(new AopDefine(".*HelloImpl", "sayHello", ".*", InterceptorImpl.class.getName())); Hello hello = container.getBeanByType(Hello.class); hello.sayHello("abc"); } |
运行结果:
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sayHello->before Hello:abc sayHello->after |
当然了,上面的类注册都是手工添加的,实际使用,会增加一个类扫描器自动添加到容器中的。
再来看一个子容器的类子:
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public static void main(String[] args) { BeanContainer container = BeanContainerFactory.getBeanContainer(); container.registerClass(InterceptorImpl.class); container.registerClass(HelloImpl.class); container.registerClass(Hello1Impl.class); BeanContainer subContainer = BeanContainerFactory.getBeanContainer("subContainer"); subContainer.registerClass(HelloHelperImpl.class); subContainer.setParent(container); container.addAop(new AopDefine(".*Hello1Impl", "sayHello", ".*", InterceptorImpl.class.getName())); subContainer.addAop(new AopDefine(".*", "set.*", ".*", InterceptorImpl.class.getName())); HelloHelper helloHelper = subContainer.getBeanByType(HelloHelper.class); helloHelper.sayHello("abc"); } |
在上面的示例中,创建了一个容器,一个子容器,然后把子容器放在父容器下。
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public class Hello1Impl implements Hello { public void sayHello(String name) { System.out.println("Hello:" + name); } } |
HelloHelper
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public interface HelloHelper { Hello getHello(); List<Hello> getHelloList(); void sayHello(String name); } |
HelloHelperImpl
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@Singleton public class HelloHelperImpl implements HelloHelper { @Inject Hello hello; @Inject private List<Hello> helloList; public void setHelloList(List<Hello> helloList) { this.helloList = helloList; } public void setHello(Hello hello) { this.hello = hello; } public Hello getHello() { return <span style=‘line-height: 14.65px; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace; ‘>hello</span>; } public List<Hello> getHelloList() { return helloList; } public void sayHello(String name) { hello.sayHello(name); } } |
下面是运行结果:
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setHello->before setHello->after setHelloList->before setHelloList->after sayHello->before Hello:abc sayHello->after |
Jar包大小:
16,208 tinyioc-0.0.12-SNAPSHOT.jar
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原文地址:http://www.cnblogs.com/j2eetop/p/4612446.html