Java注解Annotation示例
定义我们的注解类import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;// 定义注解运行期间也有效@Retention(RetentionPolicy.RUNTIME)// METHOD 定义注解可用于方法上// TYPE 定义注解可用于类上@Target( { ElementType.METHOD, ElementType.TYPE })public @interface Result {// 注解属性定义String value() default "success";String[] arrayAttr() default { "1", "2", "3" };String location() default "";String type() default "dispatcher";}
测试我们呗注解的类
@Result(location="/index.jsp",value="ajax",type="redirect")public class AjaxAction {public String login() {return "success";}public static void main(String args[]) throws SecurityException, NoSuchMethodException{//反射类，看是否是Result注解if(AjaxAction.class.isAnnotationPresent(Result.class)){//从字节码中获取Result注解和对应的属性Result ann = (Result)AjaxAction.class.getAnnotation(Result.class);System.out.println(ann.value());System.out.println(ann.type());}}} 参考资料
http://u.115.com/file/f182b68766
http://u.115.com/file/f1395e98c5
http://u.115.com/file/f1dfebea55
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