程序包 org.springframework.util

类 ReflectionUtils

  • public abstract class ReflectionUtils
extends Object
    Simple utility class for working with the reflection API and handling reflection exceptions.

    Only intended for internal use.

    从以下版本开始:
    1.2.2
    作者:
    Juergen Hoeller, Rob Harrop, Rod Johnson, Costin Leau, Sam Brannen, Chris Beams

    • 方法详细资料

      • findField

        public static Field findField​(Class<?> clazz,
                              String name)
        Attempt to find a field on the supplied Class with the supplied name. Searches all superclasses up to Object.
        参数:
        clazz - the class to introspect
        name - the name of the field
        返回:
        the corresponding Field object, or null if not found

      • findField

        public static Field findField​(Class<?> clazz,
                              String name,
                              Class<?> type)
        Attempt to find a field on the supplied Class with the supplied name and/or type. Searches all superclasses up to Object.
        参数:
        clazz - the class to introspect
        name - the name of the field (may be null if type is specified)
        type - the type of the field (may be null if name is specified)
        返回:
        the corresponding Field object, or null if not found

      • findMethod

        public static Method findMethod​(Class<?> clazz,
                                String name)
        Attempt to find a Method on the supplied class with the supplied name and no parameters. Searches all superclasses up to Object.

        Returns null if no Method can be found.

        参数:
        clazz - the class to introspect
        name - the name of the method
        返回:
        the Method object, or null if none found

      • findMethod

        public static Method findMethod​(Class<?> clazz,
                                String name,
                                Class<?>... paramTypes)
        Attempt to find a Method on the supplied class with the supplied name and parameter types. Searches all superclasses up to Object.

        Returns null if no Method can be found.

        参数:
        clazz - the class to introspect
        name - the name of the method
        paramTypes - the parameter types of the method (may be null to indicate any signature)
        返回:
        the Method object, or null if none found

      • invokeMethod

        public static Object invokeMethod​(Method method,
                                  Object target,
                                  Object... args)
        Invoke the specified Method against the supplied target object with the supplied arguments. The target object can be null when invoking a static Method.

        Thrown exceptions are handled via a call to handleReflectionException(java.lang.Exception).

        参数:
        method - the method to invoke
        target - the target object to invoke the method on
        args - the invocation arguments (may be null)
        返回:
        the invocation result, if any

      • handleReflectionException

        public static void handleReflectionException​(Exception ex)
        Handle the given reflection exception. Should only be called if no checked exception is expected to be thrown by the target method.

        Throws the underlying RuntimeException or Error in case of an InvocationTargetException with such a root cause. Throws an IllegalStateException with an appropriate message or UndeclaredThrowableException otherwise.

        参数:
        ex - the reflection exception to handle

      • handleInvocationTargetException

        public static void handleInvocationTargetException​(InvocationTargetException ex)
        Handle the given invocation target exception. Should only be called if no checked exception is expected to be thrown by the target method.

        Throws the underlying RuntimeException or Error in case of such a root cause. Throws an UndeclaredThrowableException otherwise.

        参数:
        ex - the invocation target exception to handle

      • declaresException

        public static boolean declaresException​(Method method,
                                        Class<?> exceptionType)
        Determine whether the given method explicitly declares the given exception or one of its superclasses, which means that an exception of that type can be propagated as-is within a reflective invocation.
        参数:
        method - the declaring method
        exceptionType - the exception to throw
        返回:
        true if the exception can be thrown as-is; false if it needs to be wrapped

      • isPublicStaticFinal

        public static boolean isPublicStaticFinal​(Field field)
        Determine whether the given field is a "public static final" constant.
        参数:
        field - the field to check

      • isObjectMethod

        public static boolean isObjectMethod​(Method method)
        Determine whether the given method is originally declared by Object.

      • isCglibRenamedMethod

        public static boolean isCglibRenamedMethod​(Method renamedMethod)
        Determine whether the given method is a CGLIB 'renamed' method, following the pattern "CGLIB$methodName$0".
        参数:
        renamedMethod - the method to check
        另请参阅:
        Enhancer.rename(org.springframework.cglib.core.Signature, int)

      • makeAccessible

        public static void makeAccessible​(Field field)
        Make the given field accessible, explicitly setting it accessible if necessary. The setAccessible(true) method is only called when actually necessary, to avoid unnecessary conflicts with a JVM SecurityManager (if active).
        参数:
        field - the field to make accessible
        另请参阅:
        Field.setAccessible(boolean)

      • makeAccessible

        public static void makeAccessible​(Method method)
        Make the given method accessible, explicitly setting it accessible if necessary. The setAccessible(true) method is only called when actually necessary, to avoid unnecessary conflicts with a JVM SecurityManager (if active).
        参数:
        method - the method to make accessible
        另请参阅:
        Method.setAccessible(boolean)

      • makeAccessible

        public static void makeAccessible​(Constructor<?> ctor)
        Make the given constructor accessible, explicitly setting it accessible if necessary. The setAccessible(true) method is only called when actually necessary, to avoid unnecessary conflicts with a JVM SecurityManager (if active).
        参数:
        ctor - the constructor to make accessible
        另请参阅:
        Constructor.setAccessible(boolean)

      • doWithMethods

        public static void doWithMethods​(Class<?> clazz,
                                 ReflectionUtils.MethodCallback mc,
                                 ReflectionUtils.MethodFilter mf)
        Perform the given callback operation on all matching methods of the given class and superclasses (or given interface and super-interfaces).

        The same named method occurring on subclass and superclass will appear twice, unless excluded by the specified ReflectionUtils.MethodFilter.

        参数:
        clazz - the class to introspect
        mc - the callback to invoke for each method
        mf - the filter that determines the methods to apply the callback to

      • getAllDeclaredMethods

        public static Method[] getAllDeclaredMethods​(Class<?> leafClass)
        Get all declared methods on the leaf class and all superclasses. Leaf class methods are included first.
        参数:
        leafClass - the class to introspect

      • getUniqueDeclaredMethods

        public static Method[] getUniqueDeclaredMethods​(Class<?> leafClass)
        Get the unique set of declared methods on the leaf class and all superclasses. Leaf class methods are included first and while traversing the superclass hierarchy any methods found with signatures matching a method already included are filtered out.
        参数:
        leafClass - the class to introspect

      • doWithFields

        public static void doWithFields​(Class<?> clazz,
                                ReflectionUtils.FieldCallback fc)
        Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.
        参数:
        clazz - the target class to analyze
        fc - the callback to invoke for each field

      • doWithFields

        public static void doWithFields​(Class<?> clazz,
                                ReflectionUtils.FieldCallback fc,
                                ReflectionUtils.FieldFilter ff)
        Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.
        参数:
        clazz - the target class to analyze
        fc - the callback to invoke for each field
        ff - the filter that determines the fields to apply the callback to

      • shallowCopyFieldState

        public static void shallowCopyFieldState​(Object src,
                                         Object dest)
        Given the source object and the destination, which must be the same class or a subclass, copy all fields, including inherited fields. Designed to work on objects with public no-arg constructors.

      • clearCache

        public static void clearCache()
        Clear the internal method/field cache.
        从以下版本开始:
        4.2.4