Java反射框架Reflections示例详解

<dependency>
 <groupId>org.reflections</groupId>
 <artifactId>reflections</artifactId>
 <version>0.9.10</version>
</dependency>

public class ReflectionTest {
 public static void main(String[] args) {
  // 扫包
  Reflections reflections = new Reflections(new ConfigurationBuilder()
    .forPackages("com.boothsun.reflections") // 指定路径URL
    .addScanners(new SubTypesScanner()) // 添加子类扫描工具
    .addScanners(new FieldAnnotationsScanner()) // 添加 属性注解扫描工具
    .addScanners(new MethodAnnotationsScanner() ) // 添加 方法注解扫描工具
    .addScanners(new MethodParameterScanner() ) // 添加方法参数扫描工具
    );

  // 反射出子类
  Set<Class<? extends ISayHello>> set = reflections.getSubTypesOf( ISayHello.class ) ;
  System.out.println("getSubTypesOf:" + set);

  // 反射出带有指定注解的类
  Set<Class<?>> ss = reflections.getTypesAnnotatedWith( MyAnnotation.class );
  System.out.println("getTypesAnnotatedWith:" + ss);

  // 获取带有特定注解对应的方法
  Set<Method> methods = reflections.getMethodsAnnotatedWith( MyMethodAnnotation.class ) ;
  System.out.println("getMethodsAnnotatedWith:" + methods);

  // 获取带有特定注解对应的字段
  Set<Field> fields = reflections.getFieldsAnnotatedWith( Autowired.class ) ;
  System.out.println("getFieldsAnnotatedWith:" + fields);

  // 获取特定参数对应的方法
  Set<Method> someMethods = reflections.getMethodsMatchParams(long.class, int.class);
  System.out.println("getMethodsMatchParams:" + someMethods);

  Set<Method> voidMethods = reflections.getMethodsReturn(void.class);
  System.out.println( "getMethodsReturn:" + voidMethods);

  Set<Method> pathParamMethods =reflections.getMethodsWithAnyParamAnnotated( PathParam.class);
  System.out.println("getMethodsWithAnyParamAnnotated:" + pathParamMethods);
 }
}