Java 如何在 Spring Boot 中创建自定义注解？
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How to create a custom annotation in spring boot?
提问by Djamel Kr
i'm working on a spring project and i want to make annotation.
我正在做一个 spring 项目，我想做注释。
I need something like the description below :
我需要类似下面的描述：
@CustomAnnotation("b")
public int a(int value) {
return value;
}
public int b(int value) {
return value + 1 ;
}
--------------------------
Execute :
a(1) // should return '2'
采纳答案by Dean Xu
You can use Aspect. For example, you have following annotation
您可以使用方面。例如，您有以下注释
@Target(METHOD)
@Retention(RUNTIME)
public @interface Delegate {
String value(); // this is the target method name
}
Then add the aspect component into your spring context
然后将方面组件添加到您的 spring 上下文中
@Aspect // indicate the component is used for aspect
@Component
public class DelegateAspect {
@Around(value = "@annotation(anno)", argNames = "jp, anno") // aspect method who have the annotation @Delegate
public Object handle(ProceedingJoinPoint joinPoint, Delegate delegate) throws Exception {
Object obj = joinPoint.getThis(); // get the object
Method method = ((MethodSignature) joinPoint.getSignature()).getMethod(); // get the origin method
Method target = obj.getClass().getMethod(delegate.value(), method.getParameterTypes()); // get the delegate method
return target.invoke(obj, joinPoint.getArgs()); // invoke the delegate method
}
}
Now you can use @Delegateto delegate methods
现在您可以使用@Delegate委托方法
@Component
public class DelegateBean {
@Delegate("b")
public void a(int i) {
System.out.println("a: " + i);
}
public void b(int i) {
System.out.println("b: " + i);
}
}
Let's test
让我们测试
@Inject
public void init(DelegateBean a) {
a.a(1);
a.b(1);
}
Output is
输出是
b: 1
b: 1
