com.alibaba.nacos.common.utils

类 ReflectUtils

java.lang.Object

com.alibaba.nacos.common.utils.ReflectUtils

public class ReflectUtils
extends Object

reflect utils.

版本:

$Id: ReflectUtils.java, v 0.1 2020年08月20日 12:57 PM liuzunfei Exp $

作者:

liuzunfei

方法概要

限定符和类型	方法和说明
static Object	getField(Field field, Object target) Get the field represented by the supplied field object on the specified target object.
static Object	getFieldValue(Object obj, String fieldName) get filed value of obj.
static Object	getFieldValue(Object obj, String fieldName, Object defaultValue) get filed value of obj.
static void	handleInvocationTargetException(InvocationTargetException ex) Handle the given invocation target exception.
static void	handleReflectionException(Exception ex) Handle the given reflection exception.
static Object	invokeMethod(Method method, Object target, Object... args) Invoke the specified Method against the supplied target object with the supplied arguments.
static void	rethrowRuntimeException(Throwable ex) Rethrow the given exception, which is presumably the target exception of an InvocationTargetException.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

getFieldValue

public static Object getFieldValue(Object obj,
                                   String fieldName)

get filed value of obj.

参数:

obj - obj.

fieldName - file name to get value.

返回:

field value.

getFieldValue

public static Object getFieldValue(Object obj,
                                   String fieldName,
                                   Object defaultValue)

get filed value of obj.

参数:

obj - obj.

fieldName - file name to get value.

返回:

field value.

getField

public static Object getField(Field field,
                              Object target)

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 handleReflectionException(Exception).

参数:

field - the field to get

target - the target object from which to get the field (or null for a static field)

返回:

the field's current value

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 a target method, or if an error occurs while accessing a method or field.

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

rethrowRuntimeException

public static void rethrowRuntimeException(Throwable ex)

Rethrow the given exception, which is presumably the target exception of an InvocationTargetException. Should only be called if no checked exception is expected to be thrown by the target method.

Rethrows the underlying exception cast to a RuntimeException or Error if appropriate; otherwise, throws an UndeclaredThrowableException.

参数:

ex - the exception to rethrow

抛出:

RuntimeException - the rethrown exception

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