java.lang.Object

org.qiunet.utils.reflect.ReflectUtil

public final class ReflectUtil extends Object

反射工具类

Author:: qiunet 2020-09-27 11:00

Field Summary

Fields

Modifier and Type

Field

Description

static final Predicate<Method>

USER_DECLARED_METHODS

Pre-built MethodFilter that matches all non-bridge non-synthetic methods which are not declared on java.lang.Object.
Method Summary

Modifier and Type

Method

Description

static void

doWithFields(Class<?> clazz, Consumer<Field> consumer)

Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.

static void

doWithFields(Class<?> clazz, Consumer<Field> consumer, Predicate<Field> predicate)

Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.

static void

doWithMethods(Class<?> clazz, Consumer<Method> mc)

Perform the given callback operation on all matching methods of the given class and superclasses.

static void

doWithMethods(Class<?> clazz, Consumer<Method> mc, Predicate<Method> mf)

Perform the given callback operation on all matching methods of the given class and superclasses (or given interface and super-interfaces).

static Field

findField(Class<?> clazz, String name)

Attempt to find a field on the supplied Class with the supplied name.

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.

static List<Field>

findFieldList(Class<?> clazz, Predicate<Field> filter)

Attempt to find a field on the supplied Class with the supplied name.

static Class<?>

findGenericParameterizedType(Class<?> oriClazz, BiPredicate<Class<?>,Class<?>> filter)

找出Class 上对应的泛型参数类型

static Class<?>

findGenericParameterizedType(Class<?> oriClazz, Predicate<Class<?>> filter)

找出Class 上对应的泛型参数类型

static Method[]

getAllDeclaredMethods(Class<?> leafClass)

Get all declared methods on the leaf class and all superclasses.

static Field[]

getDeclaredFields(Class<?> clazz)

This variant retrieves Class.getDeclaredFields() from a local cache in order to avoid the JVM's SecurityManager check and defensive array copying.

static Method[]

getDeclaredMethods(Class<?> clazz)

Variant of Class.getDeclaredMethods() that uses a local cache in order to avoid the JVM's SecurityManager check and new Method instances.

static Object

getField(Object t, String name)

Get the field represented by the supplied field object on the specified target object.

static Object

getField(Field field, Object obj)

Get the field represented by the supplied field object on the specified target object .

static Class<?>

getListGenericParameterizedType(Field field)

得到list field class的泛型

static <T> Constructor<T>

getMatchConstructor(Class<T> clazz, Object... params)

获得匹配的构造

static void

makeAccessible(Field field)

Make the given field accessible, explicitly setting it accessible if necessary.

static void

makeAccessible(Method method)

Make the given method accessible, explicitly setting it accessible if necessary.

static void

modifyAnnotationValue(Annotation annotation, String key, Object value)

修改注解的值

static <T> T

newInstance(Class<T> clazz, Object... params)

生成新的对象

static <T> T

newInstance(Constructor<T> constructor, Object... params)

生成新的对象.

static void

setField(Object declaringObj, Field field, Object value)

给字段设置值

static void

setField(Object declaringObj, String name, Object value)

Set the field represented by the supplied field object on the specified target object to the specified value.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- USER_DECLARED_METHODS
  
  public static final Predicate<Method> USER_DECLARED_METHODS
  
  Pre-built MethodFilter that matches all non-bridge non-synthetic methods which are not declared on java.lang.Object.
  
  Since:
  
  3.0.5
Method Details
- findFieldList
  
  public static List<Field> findFieldList(Class<?> clazz, Predicate<Field> filter)
  
  Attempt to find a field on the supplied Class with the supplied name. Searches all superclasses up to Object.
  
  Parameters:
  
  clazz - the class to introspect
  
  Returns:
  
  the corresponding Field object, or null if not found
- 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.
  
  Parameters:
  
  clazz - the class to introspect
  
  name - the name of the field
  
  Returns:
  
  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.
  
  Parameters:
  
  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)
  
  Returns:
  
  the corresponding Field object, or null if not found
- getField
  
  public static Object getField(Object t, String name)
  
  Get the field represented by the supplied field object on the specified target object. In accordance with Field.get(Object) semantics, the returned value is automatically wrapped if the underlying field has a primitive type.
  Thrown exceptions are handled via a call to
  
  Parameters:
  
  t - the target object from which to get the field
  
  name - the field to get
  
  Returns:
  
  the field's current value
- 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).
  Parameters:
  
  method - the method to make accessible
  
  See Also:
  
  Method.setAccessible(boolean)
- 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).
  Parameters:
  
  field - the field to make accessible
  
  See Also:
  
  Field.setAccessible(boolean)
- setField
  
  public static void setField(Object declaringObj, String name, Object value)
  
  Set the field represented by the supplied field object on the specified target object to the specified value. In accordance with Field.set(Object, Object) semantics, the new value is automatically unwrapped if the underlying field has a primitive type.
  Thrown exceptions are handled via a call to
  
  Parameters:
  
  declaringObj - the target object on which to set the field
  
  name - the field to set
  
  value - the value to set; may be null
- setField
  
  public static void setField(Object declaringObj, Field field, Object value)
  
  给字段设置值
  
  Parameters:
  
  declaringObj - the target object on which to set the field
  
  field - the field to set
  
  value - the value to set; may be null
- getField
  
  public static Object getField(Field field, Object obj)
  
  Get the field represented by the supplied field object on the specified target object . In accordance with Field.get(Object)
  Thrown exceptions are handled via a call to
  
  Parameters:
  
  field - the field to get
  
  obj - the field declare object instance. if field is static. it is null.
- newInstance
  
  public static <T> T newInstance(Class<T> clazz, Object... params)
  
  生成新的对象
  
  Type Parameters:
  
  T -
  
  Parameters:
  
  clazz -
  
  params -
  
  Returns:
- getMatchConstructor
  
  public static <T> Constructor<T> getMatchConstructor(Class<T> clazz, Object... params)
  
  获得匹配的构造
  
  Type Parameters:
  
  T -
  
  Parameters:
  
  clazz -
  
  params -
  
  Returns:
- newInstance
  
  public static <T> T newInstance(Constructor<T> constructor, Object... params)
  
  生成新的对象.
  
  Type Parameters:
  
  T -
  
  Parameters:
  
  constructor -
  
  params -
  
  Returns:
- doWithFields
  
  public static void doWithFields(Class<?> clazz, Consumer<Field> consumer)
  
  Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.
  
  Parameters:
  
  clazz - the target class to analyze
  
  consumer - the callback to invoke for each field
  
  Throws:
  
  IllegalStateException - if introspection fails
- doWithFields
  
  public static void doWithFields(Class<?> clazz, Consumer<Field> consumer, Predicate<Field> predicate)
  
  Invoke the given callback on all fields in the target class, going up the class hierarchy to get all declared fields.
  
  Parameters:
  
  clazz - the target class to analyze
  
  consumer - the callback to invoke for each field
  
  predicate - the filter that determines the fields to apply the callback to
  
  Throws:
  
  IllegalStateException - if introspection fails
- getDeclaredFields
  
  public static Field[] getDeclaredFields(Class<?> clazz)
  
  This variant retrieves Class.getDeclaredFields() from a local cache in order to avoid the JVM's SecurityManager check and defensive array copying.
  Parameters:
  
  clazz - the class to introspect
  
  Returns:
  
  the cached array of fields
  
  Throws:
  
  IllegalStateException - if introspection fails
  
  See Also:
  
  Class.getDeclaredFields()
- doWithMethods
  
  public static void doWithMethods(Class<?> clazz, Consumer<Method> mc)
  
  Perform the given callback operation on all matching methods of the given class and superclasses.
  The same named method occurring on subclass and superclass will appear twice, unless excluded by a Predicate.
  Parameters:
  
  clazz - the class to introspect
  
  mc - the callback to invoke for each method
  
  Throws:
  
  IllegalStateException - if introspection fails
  
  See Also:
  
  doWithMethods(Class, Consumer, Predicate)
- doWithMethods
  
  public static void doWithMethods(Class<?> clazz, Consumer<Method> mc, Predicate<Method> 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 Predicate.
  
  Parameters:
  
  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
  
  Throws:
  
  IllegalStateException - if introspection fails
- getAllDeclaredMethods
  
  public static Method[] getAllDeclaredMethods(Class<?> leafClass)
  
  Get all declared methods on the leaf class and all superclasses. Leaf class methods are included first.
  
  Parameters:
  
  leafClass - the class to introspect
  
  Throws:
  
  IllegalStateException - if introspection fails
- getDeclaredMethods
  
  public static Method[] getDeclaredMethods(Class<?> clazz)
  
  Variant of Class.getDeclaredMethods() that uses a local cache in order to avoid the JVM's SecurityManager check and new Method instances. In addition, it also includes Java 8 default methods from locally implemented interfaces, since those are effectively to be treated just like declared methods.
  Parameters:
  
  clazz - the class to introspect
  
  Returns:
  
  the cached array of methods
  
  Throws:
  
  IllegalStateException - if introspection fails
  
  Since:
  
  5.2
  
  See Also:
  
  Class.getDeclaredMethods()
- findGenericParameterizedType
  
  public static Class<?> findGenericParameterizedType(Class<?> oriClazz, Predicate<Class<?>> filter)
  
  找出Class 上对应的泛型参数类型
  
  Parameters:
  
  oriClazz - 原始class
  
  filter - 类型过滤仅给出泛型class
  
  Returns:
- findGenericParameterizedType
  
  public static Class<?> findGenericParameterizedType(Class<?> oriClazz, BiPredicate<Class<?>,Class<?>> filter)
  
  找出Class 上对应的泛型参数类型
  
  Parameters:
  
  oriClazz - 原始class
  
  filter - 类型过滤给出所在class 以及泛型class
  
  Returns:
- getListGenericParameterizedType
  
  public static Class<?> getListGenericParameterizedType(Field field)
  
  得到list field class的泛型
  
  Returns:
- modifyAnnotationValue
  
  public static void modifyAnnotationValue(Annotation annotation, String key, Object value)
  
  修改注解的值
  
  Parameters:
  
  annotation - 注解对象
  
  key - 注解字段名.
  
  value - 设置的值

Class ReflectUtil

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Details

USER_DECLARED_METHODS

Method Details

findFieldList

findField

findField

getField

makeAccessible

makeAccessible

setField

setField

getField

newInstance

getMatchConstructor

newInstance

doWithFields

doWithFields

getDeclaredFields

doWithMethods

doWithMethods

getAllDeclaredMethods

getDeclaredMethods

findGenericParameterizedType

findGenericParameterizedType

getListGenericParameterizedType

modifyAnnotationValue