1. Maven pom.xml 文件添加AOP相关的jar包
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.0.1.RELEASE</version> <scope>compile</scope>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.12</version> <scope>compile</scope>
</dependency>
2. 自定义Annotation
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface SingleLocalCache {
boolean cache() default false;
String key();
}
3. 写一个切面编程的方法来实现你想要的逻辑
import java.lang.reflect.Method;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
@Aspect
@Component
public class SingleLocalCacheAspect {
// 在方法执行前执行
@Before("@annotation(com.cisco.webex.config.SingleLocalCache)")
public Object beforeExecute(JoinPoint joinPoint) {
//MethodSignature signature = (MethodSignature) joinPoint.getSignature();
//Method method = signature.getMethod();
return null;
}
//方法返回后执行
@AfterReturning(value = "@annotation(com.cisco.webex.config.SingleLocalCache)",
returning = "result")
public void afterReturning(JoinPoint joinPoint, Object result) {
System.out.println("=====after return===");
System.out.println("result: " + result.toString());
}
//同时处理方法执行前和执行后
@Around("@annotation(com.cisco.webex.config.SingleLocalCache)")
public void around(ProceedingJoinPoint joinPoint) throws Throwable {
long startTime = System.currentTimeMillis();
//这一行会执行你的方法
joinPoint.proceed();
long timeTaken = System.currentTimeMillis() - startTime;
}
}
4. 接下来具体使用自定义的Annotation
@CrossOrigin
@RestController
public class TestController {
@RequestMapping(method = RequestMethod.GET, value="/test")
@SingleLocalCache(cache=true,key="test")
public String getSiteName(@RequestParam(value = "test") String test) {
return null;
}
}
参考文章
https://docs.spring.io/spring/docs/2.5.x/reference/aop.html
http://www.springboottutorial.com/spring-boot-and-aop-with-spring-boot-starter-aop