Java custom annotation to get annotation values annotation set in the annotation class

Java annotation mechanism is widely used in various frameworks, and some values can be set in annotations.

To get the annotation value set in the annotation class annotation: traverse the method in the custom annotation, reflect the execution method, and the result is the corresponding annotation value.

Java code example:

Package Com.doctor.spring.core;import Java.lang.annotation.documented;import Java.lang.annotation.ElementType; Import Java.lang.annotation.retention;import Java.lang.annotation.retentionpolicy;import Java.lang.annotation.target;import java.lang.reflect.method;/** * Custom annotation to get the annotation value set in the annotation class annotation That is: Iterate through the methods in the custom annotation, reflect the execution method, and the result is the corresponding annotation value. * * For complex annotation processing see: {@code annotationutils} * * @author doctor * * @time January 23, 2015 PM 6:15:31 */public Class Annotationpract Ice {public static void main (string[] args) throws Reflectiveoperationexception {myannotation myannotation = Annotationp. Class.getannotation (Myannotation.class); System.out.println (myannotation);//output://@com. Doctor.spring.core.annotationpractice$myannotation (value= annotationp,//num=12, address=[1, 2]) for (Method Method:myAnnotation.annotationType (). Getdeclaredmethods ()) {if (! Method.isaccessible ()) {method.setaccessible (true);} Object invoke = Method.invoke (myannotation); System.out.println ("Invoke METHD" + method.getname ()+ "Result:" + Invoke); if (Invoke.getclass (). IsArray ()) {object[] temp = (object[]) invoke;for (Object o:temp) {SYSTEM.O Ut.println (o);}} Output://Invoke METHD num result:12//invoke METHD value result:annotationp//invoke METHD address Result:[ljava.lang.stri ng;@74a14482//1//2} @Retention (Retentionpolicy.runtime) @Target (elementtype.type) @Documentedprivate @interface myannotation {String value () default ""; int num () default 100; String[] Address () default {};} @MyAnnotation (value = "Annotationp", num =, address = {"1", "2"}) private static class Annotationp {}}

Java custom annotation to get annotation values annotation set in the annotation class