spring aop中实现变更方法参数以及annotation 博客分类： java 技术 springaopannotationmethodvariable

1. 实现功能：

• 利用spring aop annotation实现切片操作，并改变方法参数的值
• 判断方法或方法的参数上是否有特定的annotation，如果有，则按照其它逻辑进行处理

1. aop切片操作

@Component
@Aspect
public class AopAnnotation {

    private Logger logger = LoggerFactory.getLogger(getClass());

    @Pointcut("execution(public * com.*.*.*(..))")
    public void pointCut(){

    }

    @Before(value = "pointCut()")
    public void before(){
        logger.info("annotation,   before################################");
    }

    @Around("pointCut()")
    public void around(ProceedingJoinPoint joinPoint){
        logger.info("annotation,   around################################");
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.start();
        try {
            joinPoint.proceed();
        } catch (Throwable e) {

        }
        stopwatch.stop();
        logger.info("annotation, ###################cost time: " + joinPoint.getThis().getClass().getName() +
                "\t" + stopwatch.elapsedMillis() + "(ms)");
    }

    @AfterThrowing(pointcut = "pointCut()")
    public void aa(){
          logger.info("error");
    }

    
    public Verifier verifier;
}

 

1. 声明annotation

• @Retention(RetentionPolicy.RUNTIME)
  @Target(ElementType.PARAMETER)
  public @interface Param {
    String value();
  }

   

1. 在joinpoint中进行处理，判断参数是否有annotation

• @Around("sqlEscapePoint()")
      public Object sqlEscapeAdvice(ProceedingJoinPoint joinPoint) {
          logger.info("aroundSqlEscape,   around################################");
          Object[] objects = joinPoint.getArgs();
          MethodSignature signature = (MethodSignature) joinPoint.getSignature();
          Method method = signature.getMethod();
          Annotation[][] annotations = method.getParameterAnnotations();
          for (int i = 0; i < objects.length; i++) {
              Object tmpObject = objects[i];
              boolean notEscape = false;
              if (annotations.length > 0) {
                  for (Annotation annotation : annotations[i]) {
                      if (annotation.annotationType() == NotEscapeSql.class) {
                          notEscape = true;
                      }
                  }
              }
              if (notEscape) {
                  continue;
              }
              objects[i] = EscapeUtil.escape(tmpObject, false, false, true);
          }
          Stopwatch stopwatch = new Stopwatch();
          stopwatch.start();
          Object result = null;
          try {
              result = joinPoint.proceed(objects);
          } catch (Throwable e) {
              logger.error("sql escape", e);
          }
          stopwatch.stop();
          logger.info("mapper cost time: " + joinPoint.getThis().getClass().getName() + ","
                  + method.getName() + "\t" + stopwatch.elapsedMillis() + "(ms)");
          return result;
      }