文章目录
- 1.源码
- 2. debug过程
1.源码
public class TestAop {public static void main(String[] args) throws Exception {saveGeneratedCGlibProxyFiles(System.getProperty("user.dir") + "/proxy");ApplicationContext ac = new ClassPathXmlApplicationContext("META-INF/aop.xml");MyCalculator bean = ac.getBean(MyCalculator.class);System.out.println(bean.toString());bean.add(1, 1);bean.sub(1, 1);}public static void saveGeneratedCGlibProxyFiles(String dir) throws Exception {Field field = System.class.getDeclaredField("props");field.setAccessible(true);Properties props = (Properties) field.get(null);//dir为保存文件路径System.setProperty(DebuggingClassWriter.DEBUG_LOCATION_PROPERTY, dir);props.put("net.sf.cglib.core.DebuggingClassWriter.traceEnabled", "true");}
}
public class MyCalculator /*implements Calculator */ {public Integer add(Integer i, Integer j) throws NoSuchMethodException {Integer result = i + j;System.out.println("MyCalculator add method invoked");return result;}public Integer sub(Integer i, Integer j) throws NoSuchMethodException {Integer result = i - j;return result;}public Integer mul(Integer i, Integer j) throws NoSuchMethodException {Integer result = i * j;return result;}public Integer div(Integer i, Integer j) throws NoSuchMethodException {Integer result = i / j;return result;}public Integer show(Integer i) {System.out.println("show .....");return i;}@Overridepublic String toString() {return "super.toString()";}
}
public class LogUtil {private int start(JoinPoint joinPoint) {//获取方法签名Signature signature = joinPoint.getSignature();//获取参数信息Object[] args = joinPoint.getArgs();System.out.println("log---Before advice: " + signature.getName() + "方法开始执行:参数是" + Arrays.asList(args));return 100;}public static void stop(JoinPoint joinPoint, Object result) {Signature signature = joinPoint.getSignature();System.out.println("log---AfterReturning advice: " + signature.getName() + "方法执行结束,结果是:" + result);}public static void logException(JoinPoint joinPoint, Exception e) {Signature signature = joinPoint.getSignature();System.out.println("log--- AfterThrowing advice: " + signature.getName() + "方法抛出异常:" + e.getMessage());}public static void logFinally(JoinPoint joinPoint) {Signature signature = joinPoint.getSignature();System.out.println("log---After advice: " + signature.getName() + "方法执行结束。。。。。over");}public Object around(ProceedingJoinPoint pjp) throws Throwable {Signature signature = pjp.getSignature();Object[] args = pjp.getArgs();Object result = null;try {System.out.println("log---Around advice start:" + signature.getName() + "方法开始执行,参数为:" + Arrays.asList(args));//通过反射的方式调用目标的方法,相当于执行method.invoke(),可以自己修改结果值result = pjp.proceed(args);// result=100;System.out.println("log---Around advice end: " + signature.getName() + "方法执行结束");} catch (Throwable throwable) {System.out.println("log---Around advice error:" + signature.getName() + "出现异常");throw throwable;} finally {System.out.println("log---Around advice finally:" + signature.getName() + "方法返回结果是:" + result);}return result;}
}
<?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:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd
"><!-- <bean class="com.mashibing.MyBeanFactoryPostProcessorBySelf" ></bean>--><bean id="logUtil" class="org.geekbang.thinking.in.spring.ioc.overview.aop.xml.util.LogUtil"></bean><bean id="myCalculator" class="org.geekbang.thinking.in.spring.ioc.overview.aop.xml.service.MyCalculator"></bean><aop:config><aop:aspect ref="logUtil"><aop:pointcut id="myPoint"expression="execution( Integer org.geekbang.thinking.in.spring.ioc.overview.aop.xml.service.MyCalculator.* (..))"/><aop:around method="around" pointcut-ref="myPoint"></aop:around><aop:after method="logFinally" pointcut-ref="myPoint"></aop:after><aop:before method="start" pointcut-ref="myPoint"></aop:before><aop:after-returning method="stop" pointcut-ref="myPoint" returning="result"></aop:after-returning><aop:after-throwing method="logException" pointcut-ref="myPoint" throwing="e"></aop:after-throwing></aop:aspect></aop:config><aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>
2. debug过程
生成的源码:
public class MyCalculator$$EnhancerBySpringCGLIB$$3f411fc extends MyCalculator implements SpringProxy, Advised, Factory {private boolean CGLIB$BOUND;public static Object CGLIB$FACTORY_DATA;private static final ThreadLocal CGLIB$THREAD_CALLBACKS;private static final Callback[] CGLIB$STATIC_CALLBACKS;private MethodInterceptor CGLIB$CALLBACK_0;private MethodInterceptor CGLIB$CALLBACK_1;private NoOp CGLIB$CALLBACK_2;private Dispatcher CGLIB$CALLBACK_3;private Dispatcher CGLIB$CALLBACK_4;private MethodInterceptor CGLIB$CALLBACK_5;private MethodInterceptor CGLIB$CALLBACK_6;private static Object CGLIB$CALLBACK_FILTER;private static final Method CGLIB$add$0$Method;private static final MethodProxy CGLIB$add$0$Proxy;private static final Object[] CGLIB$emptyArgs;private static final Method CGLIB$toString$1$Method;private static final MethodProxy CGLIB$toString$1$Proxy;private static final Method CGLIB$sub$2$Method;private static final MethodProxy CGLIB$sub$2$Proxy;private static final Method CGLIB$mul$3$Method;private static final MethodProxy CGLIB$mul$3$Proxy;private static final Method CGLIB$show$4$Method;private static final MethodProxy CGLIB$show$4$Proxy;private static final Method CGLIB$div$5$Method;private static final MethodProxy CGLIB$div$5$Proxy;private static final Method CGLIB$equals$6$Method;private static final MethodProxy CGLIB$equals$6$Proxy;private static final Method CGLIB$hashCode$7$Method;private static final MethodProxy CGLIB$hashCode$7$Proxy;private static final Method CGLIB$clone$8$Method;private static final MethodProxy CGLIB$clone$8$Proxy;static void CGLIB$STATICHOOK1() {CGLIB$THREAD_CALLBACKS = new ThreadLocal();CGLIB$emptyArgs = new Object[0];Class var0 = Class.forName("org.geekbang.thinking.in.spring.ioc.overview.aop.xml.service.MyCalculator$$EnhancerBySpringCGLIB$$3f411fc");Class var1;Method[] var10000 = ReflectUtils.findMethods(new String[]{"equals", "(Ljava/lang/Object;)Z", "hashCode", "()I", "clone", "()Ljava/lang/Object;"}, (var1 = Class.forName("java.lang.Object")).getDeclaredMethods());CGLIB$equals$6$Method = var10000[0];CGLIB$equals$6$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Object;)Z", "equals", "CGLIB$equals$6");CGLIB$hashCode$7$Method = var10000[1];CGLIB$hashCode$7$Proxy = MethodProxy.create(var1, var0, "()I", "hashCode", "CGLIB$hashCode$7");CGLIB$clone$8$Method = var10000[2];CGLIB$clone$8$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/Object;", "clone", "CGLIB$clone$8");var10000 = ReflectUtils.findMethods(new String[]{"add", "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "toString", "()Ljava/lang/String;", "sub", "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "mul", "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "show", "(Ljava/lang/Integer;)Ljava/lang/Integer;", "div", "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;"}, (var1 = Class.forName("org.geekbang.thinking.in.spring.ioc.overview.aop.xml.service.MyCalculator")).getDeclaredMethods());CGLIB$add$0$Method = var10000[0];CGLIB$add$0$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "add", "CGLIB$add$0");CGLIB$toString$1$Method = var10000[1];CGLIB$toString$1$Proxy = MethodProxy.create(var1, var0, "()Ljava/lang/String;", "toString", "CGLIB$toString$1");CGLIB$sub$2$Method = var10000[2];CGLIB$sub$2$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "sub", "CGLIB$sub$2");CGLIB$mul$3$Method = var10000[3];CGLIB$mul$3$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "mul", "CGLIB$mul$3");CGLIB$show$4$Method = var10000[4];CGLIB$show$4$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Integer;)Ljava/lang/Integer;", "show", "CGLIB$show$4");CGLIB$div$5$Method = var10000[5];CGLIB$div$5$Proxy = MethodProxy.create(var1, var0, "(Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;", "div", "CGLIB$div$5");}final Integer CGLIB$add$0(Integer var1, Integer var2) throws NoSuchMethodException {return super.add(var1, var2);}public final Integer add(Integer var1, Integer var2) throws NoSuchMethodException {MethodInterceptor var10000 = this.CGLIB$CALLBACK_0;if (var10000 == null) {CGLIB$BIND_CALLBACKS(this);var10000 = this.CGLIB$CALLBACK_0;}// 从这里进入MethodInterceptor的接口return var10000 != null ? (Integer)var10000.intercept(this, CGLIB$add$0$Method, new Object[]{var1, var2}, CGLIB$add$0$Proxy) : super.add(var1, var2);}
............
}
CGLIB$CALLBACK_0的advised对象的targetSource有一个普通对象MyCalculate.
获得执行链
进入调用链
进入实际的方法