在 Java 中获取注解的参数值
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Get value of a parameter of an annotation in Java
提问by Darek
So I've got a code:
所以我有一个代码：
@Path("/foo")
public class Hello {
@GET
@Produces("text/html")
public String getHtml(@Context Request request, @Context HttpServletRequest requestss){
...
}
I am using AspectJ to catch all calls to getHtmlmethod. I would like to get parameters passed to @Producesand to @Pathin my advice, i.e. "/foo"and "text/html"in this case. How can I do it using reflection ?
我正在使用 AspectJ 来捕获对getHtml方法的所有调用。我想获得传递的参数@Produces，并@Path在我的建议，即"/foo"与"text/html"在这种情况下。我如何使用反射来做到这一点？
采纳答案by harsh
To get value of the @Pathparameter:
获取@Path参数值：
String path = Hello.class.getAnnotation(Path.class).value();
Similarly, Once you have hold of MethodgetHtml
同样，一旦你掌握了 MethodgetHtml
Method m = Hello.class.getMethod("getHtml", ..);
String mime = m.getAnnotation(Produces.class).value;
回答by Damian Leszczyński - Vash
The annotation is based on interface logic. You need to call the valid member of it to retrieve the value.
注解是基于接口逻辑的。您需要调用它的有效成员来检索该值。
Definition
定义
public @interface Produces {
String type();
}
Read example
阅读示例
for (Method m: SomeClass.class.getMethods() {
Produces produce = m.getAnnotation(Produces.class);
if (produce != null)
System.out.println(produce.type());
}
Yes. You must use reflection to access to method definition. You can use Class#MgetMethods()to get the definition of method
是的。您必须使用反射来访问方法定义。您可以使用Class#MgetMethods()来获取方法的定义
For object you call obj.getClass()to get the class definition.
对于对象，您调用obj.getClass()以获取类定义。
