概述

内部类.png

反射获取内部类

通过Class的getDeclaredClasses来获取

  1.  /* Returns an array of {@code Class} objects reflecting all the
  2.      * classes and interfaces declared as members of the class represented by
  3.      * this {@code Class} object. This includes public, protected, default
  4.      * (package) access, and private classes and interfaces declared by the
  5.      * class, but excludes inherited classes and interfaces.  This method
  6.      * returns an array of length 0 if the class declares no classes or
  7.      * interfaces as members, or if this {@code Class} object represents a
  8.      * primitive type, an array class, or void.
  9.  */
  10.     @CallerSensitive
  11.     public Class<?>[] getDeclaredClasses() throws SecurityException {
  12.         checkMemberAccess(Member.DECLARED, Reflection.getCallerClass(), false);
  13.         return getDeclaredClasses0();
  14.     }

Spring抽象封装

ClassMetadata#getMemberClassNames

  1.     /**
  2.      * Return the names of all classes declared as members of the class represented by
  3.      * this ClassMetadata object. This includes public, protected, default (package)
  4.      * access, and private classes and interfaces declared by the class, but excludes
  5.      * inherited classes and interfaces. An empty array is returned if no member classes
  6.      * or interfaces exist.
  7.      * @since 3.1
  8.      */
  9.     String[] getMemberClassNames();

底层实现:StandardClassMetadata#getMemberClassNames

本质上还是反射调用Class的getDeclaredClasses方法。

  1.     public String[] getMemberClassNames() {
  2.         LinkedHashSet<String> memberClassNames = new LinkedHashSet<>(4);
  3.         for (Class<?> nestedClass : this.introspectedClass.getDeclaredClasses()) {
  4.             memberClassNames.add(nestedClass.getName());
  5.         }
  6.         return StringUtils.toStringArray(memberClassNames);
  7.     }