我希望拦截在这种情况下使用MyAnnotation注释的字段的所有赋值。如果在使用reflction分配值时它工作得更好。 这是我尝试过的,但它没有运行,我认为其他可能是错误的:
public privileged aspect MyAnnotationAspect {
pointcut hasAnnotation(MyAnnotation annotation) : @annotation(annotation);
pointcut methodExecution() : execution(* *(..));
Object around(MyAnnotation annotation) : set(String word) && methodExecution() && hasAnnotation(annotation) {
Object result = null;
try {
result = proceed(annotation, "new"); //Just to try I want to assign "new" instead of the variable word
} catch (Throwable ex) {
throw new RuntimeException(ex);
}
return result;
}
}
它表示该方法的参数太多了。谁能帮我?谢谢!
修改
现在抛出“警告:(10,0)ajc:在aspects.AnnotationAspect中定义的建议尚未应用[Xlint:adviceDidNotMatch]”
这是我的方面:
public aspect AnnotationAspect {
pointcut hasAnnotation(Annotation annotation) : @annotation(annotation);
Object around(Annotation annotation, String word) : hasAnnotation(annotation) && set(String *) && args(word) {
Object result = null;
System.out.println(thisJoinPoint);
try {
result = proceed(annotation, "intercepted");
} catch (RuntimeException ex) {
throw ex;
}
return result;
}
}
这是注释:
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface Annotation {
}
我有一个假人来测试它:
class DummyEntity{
@Annotation
var name: String =_
def setName(n: String): Unit ={
name = n
}
}
这是我正在测试它的测试:
public class AnnotationAspectTest {
private DummyEntity dummyEntity;
@Before
public void setUp(){
dummyEntity = new DummyEntity();
}
@Test
public void testing(){
dummyEntity.setName("newName");
Assert.assertEquals("intercepted", dummyEntity.name());
}
}
答案 0 :(得分:1)
methodExecution()
在这里适得其反,因为您不想捕获方法执行,而是捕获字段写入权限。因为set(..) && execution(..)
是互斥的,所以这没有逻辑意义。
此外,您需要通过args()
将指定的值绑定到参数,以便能够对其进行修改。
package de.scrum_master.aspect;
import de.scrum_master.app.MyAnnotation;
public aspect MyAnnotationAspect {
Object around(MyAnnotation annotation, String word) :
@annotation(annotation) && set(String *) && args(word)
{
System.out.println(thisJoinPoint);
Object result = null;
try {
result = proceed(annotation, "altered value");
} catch (Throwable ex) {
throw new RuntimeException(ex);
}
return result;
}
}