知识大全 IoC、AOP

Posted 2022-07-18 知

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　　从下载Spring 用eclipse新建Java项目建立我们的业务方法接口public interface BusinessObject public void doSomething(); public void doAnotherThing();import mons logging Log;import mons logging LogFactory;public interface BusinessObject public void doSomething(); public void doAnotherThing();import mons logging Log;import mons logging LogFactory; 实现业务方法注意这是的setWords使用了依赖注入所谓依赖注入就是把配置文件中的字符串什么的在程序运行时自动放到我们的程序中来如果不是这样我们就只能在代码中固化这些东西从而违背了面向对象的依赖倒置原则还有一种满足依赖倒置的方法即依赖查询这就是所谓的factory模式即在代码中请求某种抽象的东西然后根据配置得到它但这种办法向对于依赖注入多了对环境的依赖且代码冗余 EJB的JNDI查询就属于这种另外我们的Spring配置文件是以bean为核心的就是我们写的一个类在XML中描述它的名称位置和涵盖的内容关系 public class BusinessObjectImpl implements BusinessObject private String words; public void setWords(String words) this words = words; public void doSomething() Log log = LogFactory getLog(this getClass()); (words); public void doAnotherThing() Log log = LogFactory getLog(this getClass()); ( Another thing ); public class BusinessObjectImpl implements BusinessObject private String words; public void setWords(String words) this words = words; public void doSomething() Log log = LogFactory getLog(this getClass()); (words); public void doAnotherThing() Log log = LogFactory getLog(this getClass()); ( Another thing ); 建立一个运行方法类从配置文件spring beans xml中读入bo这个类的定义然后实例化一个对象import springframework beans factory xml XmlBeanFactory;import re io ClassPathResource;public class Main public static void main(String[] args) XmlBeanFactory xbf = new XmlBeanFactory(new ClassPathResource( spring beans xml )); BusinessObject bo = (BusinessObject)xbf getBean( bo ); bo doSomething(); bo doAnotherThing(); import springframework beans factory xml XmlBeanFactory;import re io ClassPathResource;public class Main public static void main(String[] args) XmlBeanFactory xbf = new XmlBeanFactory(new ClassPathResource( spring beans xml )); BusinessObject bo = (BusinessObject)xbf getBean( bo ); bo doSomething(); bo doAnotherThing(); 建立一个拦截器类invoke是MethodInterceptor必须实现的方法表示拦截时的动作大家仔细体会代码中的含义import aopalliance intercept MethodInterceptor;import aopalliance intercept MethodInvocation;import mons logging Log;import mons logging LogFactory;public class MyInterceptor implements MethodInterceptor private String before after; public void setAfter(String after) this after = after; public void setBefore(String before) this before = before; public Object invoke(MethodInvocation invocation) throws Throwable Log log = LogFactory getLog(this getClass()); (before); Object rval = invocation proceed(); (after); return rval; import aopalliance intercept MethodInterceptor;import aopalliance intercept MethodInvocation;import mons logging Log;import mons logging LogFactory;public class MyInterceptor implements MethodInterceptor private String before after; public void setAfter(String after) this after = after; public void setBefore(String before) this before = before; public Object invoke(MethodInvocation invocation) throws Throwable Log log = LogFactory getLog(this getClass()); (before); Object rval = invocation proceed(); (after); return rval;

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