spring入门——慕课网

xiaoxiao2021-03-26 26

慕课网,spring入门篇 IOC:控制反转(Inversion of Control)

DI:依赖注入(Dependency Injection)

边看边编写的代码:

http://download.csdn.net/detail/fulq1234/9754355

**2-1:IOC及Bean容器** 1.IOC是接口编程 2.接口:OneInterface 实现类:OneInterfaceImpl spring-ioc.xml: <bean id="oneInterface" class="com.imooc.ioc.interfaces.OneInterfaceImpl"></bean> 测试类： OneInterface temp=(OneInterface)ac.getBean("oneInterface"); 3.Bean容器初始化文件

FileSystemXmlApplicationContext context=new FileSystemXmlApplicationContext("F:/workspace/appcontext.xml"); //classpath ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("classpath:spring-context.xml");

Web应用

<web-app> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>context</servlet-name> <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class> <load-on-start>1</load-on-start> </servlet> </web-app>

**2-2:Spring注入方式** 1.设值注入:自动调用类的set方法 <beans> <bean id="injectionService" class="com.imooc.ioc.injection.service.InjectionServiceImpl"> <property name="injectionDAO" ref="injectionDAO"/> </bean> <bean id="injectionDAO" class="com.imooc.ioc.injection.dao.InjectionDAOImpl"/> </beans>

构造注入:必须有个构造器，构造器的参数是InjectionDAO

**3-1:Spring Bean装配之Bean的配置项及作用域** 1.Bean配置项 Id Class Scope Constructor arguments Properties Autowiring mode lazy-initialization mode Initialization/destruction method Bean的作用域(scope) singleton:单例，指一个Bean容器中只存在一份,默认使用 prototype:每次请求（每次使用）创建新的，destroy方式不生效 request:每次http请求创建一个实例且仅在当前request内有效 session:同上，每次http请求创建,当前session内有效 global session:基于portlet的web中有效(portlet定义了global session)，如果是在web中，同session **3-2:spring Bean装配之Bean的生命周期** 1.生命周期定义初始化使用

销毁

在网上一个比较好的图片，引用一下

2.初始化实现org.springframework.beans.factory.InitializingBean接口,覆盖afterPropertiesSet方法配置init-method

<bean id="exampleInitBean" class="examples.ExampleBean" init-method="init"/> public class Examplebean{ public void init(){} }

3.销毁实现org.springframework.beans.factory.DisposableBean接口，覆盖destroy方法配置destroy-method

4.配置全局默认初始化.销毁方法

<?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.xsd" default-init-method="init" default-destory-method="destroy"> </beans>

**3-3.Spring Bean装配之Aware接口** 1.ApplicationContextAware BeanNameAware Java文件 import org.springframework.beans.factory.BeanNameAware; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; public class MoocbeanName implements BeanNameAware,ApplicationContextAware{ private String name; public void setBeanName(String arg0) { name=arg0; System.out.println("MoocbeanName:"+arg0); } public void setApplicationContext(ApplicationContext arg0) throws BeansException { System.out.println("MoocbeanName:"+arg0.getBean(name).hashCode()); } } spring-aware.xml <bean id="moocbeanName" class="com.imooc.aware.MoocbeanName"/>

测试

@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:spring-aware.xml"}) public class MoocApplicationContextTest { @Autowired ApplicationContext ac; @Test public void testBeanname(){ System.out.println("testBeanname:"+ac.getBean("moocbeanName").hashCode()); } }

打印: MoocbeanName:moocbeanName MoocbeanName:1607305514 testBeanname:1607305514 **3-4.Spring Bean装配之自动装配(Autowiring)** No:不做任何操作 byname:根据属性名自动装配 byType:类型，如果没有找到相匹配的bean，则什么事都不发生 Constructor:与byType方式类似,不同之处在于它应用与构造器参数。如果没有找到，那么就抛出异常正常的是以“设值注入”和“构造注入”，现在不用写这个，用自动装配 <beans ..... default-autowire="byName"> </beans> **3-5.Spring Bean装配之Resource** 1.针对于资源文件的统一接口 - UrlResource : URL对应的资源，根据一个URL地址即可构建 - ClassPathResource : 获取类路径下的资源文件 - FileSystemResource : 获取文件系统里面的资源 - ServletContextResource : ServletContext封装的资源，用于访问ServletContext环境下的资源 - InputStreamResource : 针对于输入流封装的资源 - ByteArrayResource : 针对于字节数组封装的资源 2.ResourceLoader 所有Application contexts都包含接口ResourceLoader public interface ResourceLoader{ Resource getResource(String location); } Resource template = ctx.getResource("some/resource/path/myTemplate.txt");//依赖于Application context Resource template = ctx.getResource("classpath:some/resource/path/myTemplate.txt"); Resource template = ctx.getResource("file:/some/resource/path/myTemplate.txt"); public class MoocResource implements ApplicationContextAware{ private ApplicationContext applicationContext; public void setApplicationContext(ApplicationContext arg0) throws BeansException { this.applicationContext=arg0; } public void resource() throws IOException{ //Resource resource = applicationContext.getResource("classpath:config.txt"); //Resource resource = applicationContext.getResource("file:F:\\eclipse-jee-mars-2-win32-x86_64\\eclipse\\workspace\\Spring\\src\\main\\resources\\config.txt"); //Resource resource = applicationContext.getResource("url:http://www.w3school.com.cn/xml/xml_syntax.asp"); Resource resource = applicationContext.getResource("config.txt");//依赖于Application context，也就是classpath System.out.println("file:"+resource.getFilename()); System.out.println("length:"+resource.contentLength()); } } **4-1.Spring Bean装配之Bean的定义及作用域的注解实现** 1.<context:annotation-config/>：仅会查找在同一个AppliationContext中的Bean注解 @Component,@Repository,@Service,@Controller @Required @Autowired @Qualifier @Resource <context:component-scan>包含<context:annotation-config>,通常在使用前者后，不再使用后者 2.默认情况下，类被自动发现并注册bean的条件是：使用@Component,@Repository,@Service,@Controller注解或者使用@Component的自定义注解如：下面例子的XML配置忽略所有的@Repository注解并用“Stub”代替 <beans> <context:component-scan base-package="org.example"> <context:include-filter type="regex" expression=".*Stub.*Repository"/> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Repository"/> </context:component-scan> </beans> type包含:annotation,assignable,aspectj,regex,custom 3.还可以使用use-default-filters="false"禁用自动发现与注册 4,定义Bean . @Service("myMovieListener")

. 可以自定义bean的命令策略

5,作用域(Scope) @Scope("prototype")

也可以自定义scope策略，实现ScopeMetadataResolver接口并提供一个无参构造器

6,代理方式

可以使用scoped-proxy属性指定代理，有三个值可选:no,interfaces,targetClass

**4-2.Spring Bean装配之Autowired注解说明-1** 1.@Required注解试用于bean属性的setter方法。

受影响的bean(MovieFinder)属性必须在配置时被填充，

public class SimpleListerner{ private MovieFinder m; @Required public void setMovieFinder(MovieFinder m){ thism=m; } }

2.@Autowired 可以setter方法 private MovieFinder m; @Autowired public void setMovieFinder(MovieFinder m){ this.m=m; } 可用于构造器或者成员变量 @Autowired private MovieCatelog movieCatelog; private CustomerPDao cDao; @Autowired public MovieRecommender(CustomerPDao cDao){ this.cDao=cDao; } @Autowired(required=false) 每个类只能有一个构造器被标记为required=true **4-3.Spring Bean装配之Autowired注解说明-2** 1.可以使用@Autowired注解那些众所周知的解析依赖性接口，比如：BeanFactory,ApplicationContext context,Enviroment,ResourceLoader,ApplicationEventPublisher, @Autowired是由Spring BeanPostProcessor处理的，所以不能在自己的BeanPostProcessor或BeanFacotryPostProcessor类型应用这些注解,这些类型必须通过xml或者spring的@Bean注解 .可以通过添加注解给需要该类型的数组的字段或方法，以提供ApplicationContext中的所有特定类型的bean private Set<MovieCatelog> m; @Autowired public void setMovieCatelogs(Set<MovieCatelog> m){ this.m=m; } .可以用于装配key为String的Map

.如果希望数组有序，可以让bean实现org.springframework.core.Ordered接口或使用的@Order注解

@Order(2) @Component public class BeanImplOne implements BeanInterface { } @Order(1) @Component public class BeanImplTwo implements BeanInterface { } @Component public class BeanInvoker { @Autowired private List<BeanInterface> list; @Autowired private Map<String,BeanInterface> map; public void say(){ if(null != list){ System.out.println("list..."); for(BeanInterface bean : list){ System.out.println(bean.getClass().getName()); } }else{ System.out.println("List is null!!!"); } if(null!=map && 0!=map.size()){ System.out.println("map...."); for(Map.Entry<String, BeanInterface> entry:map.entrySet()){ System.out.println(entry.getKey()+" "+entry.getValue().getClass().getName()); } }else{ System.out.println("map is null!!!!"); } } } @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:spring-beanannotation.xml"}) public class BeanInvokerTest { @Autowired ApplicationContext ac; @Test public void testMultiBean() { BeanInvoker invoker=(BeanInvoker) ac.getBean("beanInvoker"); invoker.say(); } }

打印结果:

list... com.imooc.beanannotation.multibean.BeanImplTwo com.imooc.beanannotation.multibean.BeanImplOne map.... beanImplOne com.imooc.beanannotation.multibean.BeanImplOne beanImplTwo com.imooc.beanannotation.multibean.BeanImplTwo

**4-4.Spring Bean装配之Autowired注解说明-3**

@Qualifier 按类型自动装配可能多个bean实例的情况，可以使用Spring的@Qualifier注解缩小范围（或指定唯一），也可以用于指定单独的构造器参数或方法参数 1.

public class MovieRe{ @Autowired @Qualifier("main") private MovieCatalog movieCatelog; //... } public class MovieRe{ private MovieCatalog movicCatelog; @Autowired public void prepare(@Qualifier("main") MovieCatelog movieCatelog){ this.movieCatelog=movieCatelog; } //... }

2. <beans> <bean class="example.SimpleMovieCatelog"> <qualifier value="main"/> </bean> <bean class="example.SimpleMovieCatelog"> <qualifier name="action"/> </bean> </beans> 如果通过名字进行注解注入，主要使用的不是@Autowired(即使在技术上能够通过@Qualifier指定bean的名字)@Resource 3.@Autowired适用于fields,constructors,multi-argument methods这些允许在参数级别使用@Qualifier注解缩小范围的情况 @Resource适用于成员变量，只有一个参数的setter方法，所以在目标是构造器或一个多参数方法时，最好的方式是使用qualifiers **4-5 spring Bean装配之基于Java的容器注解说明——@Bean** .@Bean标识一个用于配置和初始化一个由SpringIoC容器管理的新对象的方法，类似于XML配置文件的<bean/> .可以在Spring的@Component注解的类中使用@Bean注解(仅仅是可以)。 .上一点中，通常使用的是@Configuration @Configuration public class AppConfig{ @Bean public MyService myService(){ return new MyServiceImpl(); } }

等价于

**4-6 spring Bean装配之基于Java的容器注解说明——@ImportResource和@Value** @Configuration @ImportResource("classpath:/com/acme/jdbc.properties"); public class AppConfig{ @Value("${jdbc.url}" private String url; @Value("${jdbc.username}") private String username; @Value("${jdbc.password}") private String password; @Bean public DataSource dataSource(){ return new DriverManagerDataSource(url,username,password); } }

等价于

**4-7 spring Bean装配之基于Java的容器注解说明——@Bean和@Scope** 默认@Bean是单例的

@Bean @Scope(value="session",proxyMode=ScopedProxyMode.TARGET_class) **4-8 spring Bean装配之基于Java的容器注解说明——基于泛型的自动装配**

@Configuration public class MyConfiguration{ @Bean public StringStore stringStore(){ return new StringStore(); } @Bean public IntegerStore integerStore(){ return new IntegerStore(); } }

使用1

@Autowired private Store<String> s1; @Autowired private Store<Integer> s2; 使用2 @Autowired private List<Store<Integer>> s; **4-9. Spring Bean装配之Spring对JSR支持的说明** @Resource @Named 使用特定名称进行依赖注入,于@Component是等效的 @Injected

**5-1. Spring AOP基本概念及特点** AOP:Aspect Oriented Programming的缩写通过预编译和运行期动态代理实现程序功能的统一维护的一种技术。预编译 AspectJ 运行期动态代理(JDK动态代理,CGLib动态代理) SpringAOP JbossAOP AOP的几个相关概念切面(Aspect): 连接点(Joinpoint) 通知(Advice)：在特定连接点执行的动作切入点(Pointcut) 引入(Introduction) 目标对象(Target Object) AOP代理(AOP Proxy) 织入(Weaving) Advice的类型前置通知(Before advice) 返回后通知(After returning advice) 抛出异常后通知(After throwing advice) 后通知(After(finally) advice) 环绕通知(Around Advice) **5-2. 配置切面aspect**

<aop:config> <aop:aspect id="myAspect" ref="aBean"> ... </aop> </aop:config>

**5-3. 配置切入点Pointcut** pointcut . execution(public **(..)) 切入点为执行所有public方法时 . execution(* set*(..)) 切入点为执行所有set开始的方法时 . execution(* com.xyz.service.AccountService.*(..) 切入点为执行AccountService类中的所有方法时 . execution(* com.xyz.service..(..)) 切入点为执行com.xyz.service包下的所有方法时 . execution(* com.xyz.service...(..)) 切入点为执行com.xyz.service包及其子包下的所有方法时 . within(com.xyz.service.*)(only in Spring AOP) . within(com.xyz.service..*(only in Spring AOP) within 用于匹配指定类型内的方法执行 . this(com.xyz.service.AccountService)(only in Spring AOP) this 用于匹配当前AOP代理对象类型的执行方法。 . target(com.xyz.service.AccountService)(only in Spring AOP) target用于匹配当前目标对象类型的执行方法 . args(java.io.Serializable)(only in Spring AOP) . @Target(org.springframework.tansaction.annotation.Transactional)(only in Spring AOP) . @within(org.springframework.tansaction.annotation.Transactional)(only in Spring AOP) . @annotation(org.springframework.tansaction.annotation.Transactional)(only in Spring AOP) args用于匹配当前执行的方法传入的参数为指定类型的执行方法。 pointcut . @args(com.xyz.security.Classified)(only in Spring AOP) . bean(tradeService)(only in Spring AOP) . bean(*Service)(only in Spring AOP) **5-4. Advice应用(上)**

public Object around(ProceedingJoinPoint pjp){ //start stopwatch Object retVal = pjp.proceed(); //stop stopwatch return retVal; } public Object aroundInit(ProceedingJoinPoint pjj,String bizName,int times) throws Throwable{ System.out.println("MoocAspect aroundInit bizName:"+bizName+",times:"+times); //Start Object obj= pjj.proceed(); //Stop return obj; }

应用举例,记录日志。当执行action类的时候，会记录日志

package com.company.business.admin.core; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import com.company.business.admin.core.service.IAdminLogManager; import com.company.common.bean.core.AdminUser; import com.company.core.util.DateUtil; /** * 此切面主要用于切所有action类的所有方法<br/> * 只要action执行任何方法就会触发该切面 * @since 2016-12-6 16:50 */ @Component @Aspect public class AdminAspect { @Autowired private IAdminLogManager adminLogManager; private Log log = LogFactory.getLog(AdminAspect.class); @Pointcut("execution (public * com.company.business.admin.dev.*.action.*Controller.*(..))") public void serviceExecution(){} @Before("serviceExecution()") public void startSomething(JoinPoint jp) { } @After("serviceExecution()") public void endSomething(JoinPoint jp) { AdminUser currUser = UserContext.getCurrentAdminUser(); String username = "未知"; String realname = "未知"; if (currUser != null) { username = currUser.getUsername(); realname = currUser.getRealname(); } try { String methodname = jp.getSignature().getName(); if (!methodname.toLowerCase().contains("list") && !methodname.toLowerCase().contains("show")) { adminLogManager.add(new AdminLog(username, realname, //真实姓名 jp.getTarget().getClass().getName(), //操作人操作的controller类 jp.getSignature().getName(), //操作人操作的controller类的方法名 DateUtil.getDateline()//操作时间 )); } } catch (Exception e) { log.error("切面插日志异常:" + e.getMessage() ,e); } } }

**5-6. Introductions应用**

. schema-defined aspects只支持singleton model

Fit.java

package com.imooc.aop.schema.advice; public interface Fit { void filter(); } FitImpl.java

package com.imooc.aop.schema.advice; public class FitImpl implements Fit { public void filter() { System.out.println("FitImpl filter."); } } MoocAspect.java

package com.imooc.aop.schema.advice; import org.aspectj.lang.ProceedingJoinPoint; public class MoocAspect { public void before() { System.out.println("MoocAspect before."); } public void afterReturning() { System.out.println("MoocAspect afterReturning."); } public void afterThrowing() { System.out.println("MoocAspect afterThrowing."); } public void after() { System.out.println("MoocAspect after."); } public Object around(ProceedingJoinPoint pjp) { Object obj = null; try { System.out.println("MoocAspect around 1."); obj = pjp.proceed(); System.out.println("MoocAspect around 2."); } catch (Throwable e) { e.printStackTrace(); } return obj; } public Object aroundInit(ProceedingJoinPoint pjp, String bizName, int times) { System.out.println(bizName + " " + times); Object obj = null; try { System.out.println("MoocAspect aroundInit 1."); obj = pjp.proceed(); System.out.println("MoocAspect aroundInit 2."); } catch (Throwable e) { e.printStackTrace(); } return obj; } }

AspectBiz.java

package com.imooc.aop.schema.advice.biz; public class AspectBiz { public void biz() { System.out.println("AspectBiz biz."); // throw new RuntimeException(); } public void init(String bizName, int times) { System.out.println("AspectBiz init : " + bizName + " " + times); } }

test

package com.imooc.aop.schema.advice.biz; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.imooc.aop.schema.advice.Fit; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:spring-aop-schema-advice2.xml"}) public class AspectBizTest2 { @Autowired ApplicationContext ac; @Test public void testFit() { Fit biz=(Fit)ac.getBean("aspectBiz"); biz.filter(); } }

输出结果

FitImpl filter.

**5-7. Advisors** <beans> <aop:config> <aop:pointcut id="businessService" expression="execution(* com.xyz.myapp.service..(..))"/> <aop:advisor pointcut-ref="businessService" advice-ref="tx-advice"/> </aop:config> <tx:advice id="tx-advice"> <tx:attributes> <tx:method name="*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> </beans>

**6-1. Spring AOP API的Pointcut,advice概念及应用** . NameMatchMethodPointcut根据方法名字进行匹配 . 成员变量:mappedNames,匹配的方法名集合 BeforeAdvice ThrowsAdvice AfterReturningAdvice Interceptor MethodInterceptor implements Interceptor 引入通知(Introduction advice)作为一个特殊的拦截通知，需要IntroductionAdvisor和IntroductionInterceptore仅适用于类，不能和任何切入点一起使用。 **6-2. ProxyFactoryBean及相关内容(上)**

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="bizLogicImplTarget" class="com.imooc.aop.api.BizLogicImpl"/> <bean id="moocBeforeAdvice" class="com.imooc.aop.api.MoocBeforeAdvice"/> <bean id="moocAfterReturningAdvice" class="com.imooc.aop.api.MoocAfterReturningAdvice"/> <bean id="moocThrowsAdvice" class="com.imooc.aop.api.MoocThrowsAdvice"/> <bean id="moocMethodInterceptor" class="com.imooc.aop.api.MoocMethodInterceptor"/> <bean id="pointcutBean" class="org.springframework.aop.support.NameMatchMethodPointcut"> <property name="mappedNames"> <list> <value>sa*</value> </list> </property> </bean> <bean id="defaultAdvisor" class="org.springframework.aop.support.DefaultPointcutAdvisor"> <property name="advice" ref="moocBeforeAdvice"/> <property name="pointcut" ref="pointcutBean"/> </bean>  <bean id="bizLogicImpl" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces"> <value>com.imooc.aop.api.BizLogic</value> </property> <property name="target">  <bean class="com.imooc.aop.api.BizLogicImpl"/> </property> <property name="interceptorNames"> <list> <value>moocBeforeAdvice</value> <value>moocAfterReturningAdvice</value> <value>moocThrowsAdvice</value> <value>moocMethodInterceptor</value> </list> </property> </bean> </beans>

package com.imooc.aop.api; import java.lang.reflect.Method; import org.springframework.aop.MethodBeforeAdvice; public class MoocBeforeAdvice implements MethodBeforeAdvice { public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable { System.out.println("MoocBeforeAdvice:"+arg0.getName()+" "+arg1.getClass().getName()); } }

package com.imooc.aop.api; import java.lang.reflect.Method; import org.springframework.aop.AfterReturningAdvice; public class MoocAfterReturningAdvice implements AfterReturningAdvice { public void afterReturning(Object returnVal, Method method, Object[] arg2, Object target) throws Throwable { System.out.println("MoocAfterReturningAdvice:"+method.getName()+" "+target.getClass().getName()+" "+returnVal); } }

package com.imooc.aop.api; import java.lang.reflect.Method; import org.springframework.aop.ThrowsAdvice; public class MoocThrowsAdvice implements ThrowsAdvice{ public void afterThrowing(Exception ex) throws Throwable{ System.out.println("afterThrowingAdvice afterThrowing 1"); } public void afterThrowing(Method method,Object[] args,Object target,Exception ex) throws Throwable{ System.out.println("afterThrowingAdvice afterThrowing 2:"+method.getName()+""+target.getClass().getName()); } }

package com.imooc.aop.api; import org.aopalliance.intercept.MethodInterceptor; import org.aopalliance.intercept.MethodInvocation; public class MoocMethodInterceptor implements MethodInterceptor { public Object invoke(MethodInvocation invocation) throws Throwable { System.out.println("MoocMethodInterceptor 1:"+invocation.getMethod().getName()+" "+invocation.getStaticPart().getClass().getName()); Object obj= invocation.proceed(); System.out.println("MoocMethodInterceptor 2:"+invocation.getMethod().getName()+" "+invocation.getStaticPart().getClass().getName()); return obj; } }

package com.imooc.aop.api; public interface BizLogic { String save(); }

package com.imooc.aop.api; public class BizLogicImpl implements BizLogic{ public String save() { System.out.println("BizLogicImpl:BizLogicImpl save."); return "Logic save."; } }

测试类

package com.imooc.aop.api; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:spring-aop-api.xml"}) public class BizLogicImplTest { @Autowired ApplicationContext ac; @Test public void testAA() { BizLogic logic=(BizLogic) ac.getBean("bizLogicImpl"); logic.save(); } } 运行结果

MoocBeforeAdvice:save [Ljava.lang.Object; MoocMethodInterceptor 1:save java.lang.reflect.Method BizLogicImpl:BizLogicImpl save. MoocMethodInterceptor 2:save java.lang.reflect.Method MoocAfterReturningAdvice:save com.imooc.aop.api.BizLogicImpl Logic save.

**6-3. ProxyFactoryBean及相关内容(下)** Proxying classes . 前面的例子，如果没有Person接口，这种情况下Spring会使用CGLIB代理，而不是JDK动态代理。 . CGLIB(Code Generation Library)代理的工作原理是在运行时生产目标类的子类，Spring配置这个生成的子类委托方法调用到原来的目标。 . 用*做通配，匹配所有拦截器(Interceptor而不是Advice)加入通知链

<property name="interceptorNames"> <list> <value>global*</value> </list> </property>

简化的proxy定义抽象属性标记父bean定义为抽象的这样它不能被实例化

<beans> <bean id="txProxyTemplate" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager" ref="transactionManager"/> <property name="transactionAttributes"> <props> <prop key="*">PROPAGATION_REQUIRED</prop> </props> </property> </bean> <bean id="myService" parent="txProxyTemplate"> <property name="target"> <bean class="org.springframework.samples.MySpecialServiceImpl"/> </property> <property name="transactionAttributes"> <props> <prop key="get*">PROPAGATTION_REQUIRED,readOnly</prop> <prop key="find*">PROPAGATTION_REQUIRED,readOnly</prop> </props> </property> </bean> </beans>

**7-1. AspectJ介绍及Ponitcut注解应用** Spring中配置@AspectJ 确保AspectJ的aspectjweaver.jar库包含在应用程序(版本1.6.8或更高版本)的classpath中 @Configuration @EnableAspectJAutoProxy public class AppConfig{} 或者是 <aop:aspectj-autoproxy/> aspect @AspectJ切面使用@Aspect注解配置,拥有@Aspect的任何bean将被Spring自动识别并应用 @Aspect注解是不能够通过类路径自动检测发现的，所有需要配合使用@Component注释或者在xml配置bean pointcut 一个切入点通过一个普通的方法定义来提供，并且用@Pointcut注释，方法返回类型必须是void execution:匹配方法执行的连接点 within:限制匹配特定类型的连接点 this target args @target @args @withiin @annotation 组合pointcut 切入点表达式可以通过&&,||和!进行组合,也可以通过名字引用切入点表达式。如:@Pointcut("anyPublicOperation() && inTrading()") **7-2. Advice定义及实例** @Component @Aspect public class MoocAspect{ @Before("execution(* com.imooc.aop.aspectj.biz.*Biz.*(..))") public void before(){} } //After returning advice @Aspect public class AfterReturningExample{ @AfterReturning("com.xyz.myapp.SystemArchitecture.dataAccessOperation()") public void doAccessCheck(){} } 或者 @Aspect public class AfterReturningExample{ @AfterReturning(pointcut="com.xyz.myapp.SystemArchitecture.dataAccessOperation()",returning="retVal") public void doaccessCheck(Object retVal){} } After throwing advice @AfterThrowing After(finally)advice @After Around advice

@Around，通知方法的第一个参数必须是ProceedingJoinPoint类型

@Aspect public class AroundExample{ @Around("com.xyz.myapp.SystemArchitecture.businessService()") public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable{ //start stopwatch Object retVal = pjp.proceed(); //stop stopwatch return retVal; } }

**7-3. Advice扩展**

代码1. @Before("com.xyz.myapp.SystemArchitecture.dataAccessOperation() && args(account,..)") public void validateAccount(Account account){} 代码2. @Pointcut("com.xyz.myapp.SystemArchitecture.dataaccessOperation() && args(acount,..)") private void accountDataAccessOperation(Account account){} @Before("accountDataAccessOperation(account)") public void validateAccount(Account account){} 代码3. @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.NETHOD) public @interface Auditable{ AuditCode value(); }

代码4.

@Before("com.xyz.lib.Pointcuts.anyPublicMethod() && @annotation(auditable)") public void audit(Auditable auditable){ AuditCode code = auditable.value(); //... }

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