刚才学习SpringAop的时候觉得好强大
演示效果
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| docker-run curl http://localhost:9003/aop/
{"code":"200"}%
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| [XNIO-1 task-1] [LogsAspect.java : 50] annotationAop value index
[XNIO-1 task-1] [LogsAspect.java : 50] annotationAop value index
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Spring Aop
AOP(Aspect-Oriented Programming:⾯向切⾯编程)能够将那些与业务⽆关，却为业务模块所共同调⽤的逻辑或责任（例如事务处理、⽇志管理、权限控制等）封装起来，便于减少系统的重复代码，降低模块间的耦合度，并有利于未来的可拓展性和可维护性。
- Spring Aop是运行时增强。
- Cglib Aop是编译器增强。
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@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(AspectJAutoProxyRegistrar.class)
public @interface EnableAspectJAutoProxy {
boolean proxyTargetClass() default false;
boolean exposeProxy() default false;
}
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Spring注解
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| @Aspect
@Pointcut
@Before
@AfterReturning
@Afterthrowing
@After
@Around
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pom依赖
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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
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代码
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package cn.z201.aop;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface AnnotationAop {
String value();
}
package cn.z201.aop;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
@Component
@Aspect
@Slf4j
public class LogsAspect {
@Pointcut("@annotation(cn.z201.aop.AnnotationAop)")
private void cutMethod() {
}
@AfterThrowing("cutMethod()")
public void afterThrowing(JoinPoint joinPoint) {
log.info("after throwing");
}
@Before("cutMethod()")
public void before(JoinPoint joinPoint) throws Throwable {
String methodName = joinPoint.getSignature().getName();
Object[] params = joinPoint.getArgs();
if (null != params && params.length != 0) {
log.info(" method name {} args {}", methodName, params[0]);
}
AnnotationAop annotationAop = getDeclaredAnnotation(joinPoint);
if (null != annotationAop) {
log.info(" annotationAop value {} ", annotationAop.value());
}
}
public AnnotationAop getDeclaredAnnotation(JoinPoint joinPoint) throws NoSuchMethodException {
String methodName = joinPoint.getSignature().getName();
Class<?> targetClass = joinPoint.getTarget().getClass();
Class<?>[] parameterTypes = ((MethodSignature) joinPoint.getSignature()).getParameterTypes();
Method objMethod = targetClass.getMethod(methodName, parameterTypes);
AnnotationAop annotation = objMethod.getDeclaredAnnotation(AnnotationAop.class);
return annotation;
}
}
package cn.z201.aop;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.Map;
@RestController
public class AppApplicationController {
@RequestMapping(value = "")
@AnnotationAop(value = "index")
public Object index() {
Map<String, Object> data = new HashMap<>();
data.put("code", "200");
return data;
}
}
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END