net.gdface.reflection

类 MethodUtils

java.lang.Object

net.gdface.reflection.MethodUtils

public class MethodUtils
extends java.lang.Object

copy from org.apache.commons.beanutils.MethodUtils

Utility reflection methods focused on methods in general rather than properties in particular.

Known Limitations

Accessing Public Methods In A Default Access Superclass

There is an issue when invoking public methods contained in a default access superclass. Reflection locates these methods fine and correctly assigns them as public. However, an IllegalAccessException is thrown if the method is invoked.

MethodUtils contains a workaround for this situation. It will attempt to call setAccessible on this method. If this call succeeds, then the method can be invoked as normal. This call will only succeed when the application has sufficient security privilages. If this call fails then a warning will be logged and the method may fail.

从以下版本开始:

2.7.0

构造器概要

构造器

构造器和说明
MethodUtils()

方法概要

限定符和类型	方法和说明
static int	clearCache() Clear the method cache.
static java.lang.reflect.Method	getAccessibleMethod(java.lang.Class<?> clazz, java.lang.reflect.Method method) Return an accessible method (that is, one that can be invoked via reflection) that implements the specified Method.
static java.lang.reflect.Method	getAccessibleMethod(java.lang.Class<?> clazz, java.lang.String methodName, java.lang.Class<?> parameterType) Return an accessible method (that is, one that can be invoked via reflection) with given name and a single parameter.
static java.lang.reflect.Method	getAccessibleMethod(java.lang.Class<?> clazz, java.lang.String methodName, java.lang.Class<?>[] parameterTypes) Return an accessible method (that is, one that can be invoked via reflection) with given name and parameters.
static java.lang.reflect.Method	getAccessibleMethod(java.lang.reflect.Method method) Return an accessible method (that is, one that can be invoked via reflection) that implements the specified Method.
static java.lang.reflect.Method	getMatchingAccessibleMethod(java.lang.Class<?> clazz, java.lang.String methodName, java.lang.Class<?>[] parameterTypes) Find an accessible method that matches the given name and has compatible parameters.
static java.lang.Class<?>	getPrimitiveType(java.lang.Class<?> wrapperType) Gets the class for the primitive type corresponding to the primitive wrapper class given.
static java.lang.Class<?>	getPrimitiveWrapper(java.lang.Class<?> primitiveType) Gets the wrapper object class for the given primitive type class.
static java.lang.Object	invokeExactMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object arg) Invoke a method whose parameter type matches exactly the object type.
static java.lang.Object	invokeExactMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object[] args) Invoke a method whose parameter types match exactly the object types.
static java.lang.Object	invokeExactMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object[] args, java.lang.Class<?>[] parameterTypes) Invoke a method whose parameter types match exactly the parameter types given.
static java.lang.Object	invokeExactStaticMethod(java.lang.Class<?> objectClass, java.lang.String methodName, java.lang.Object arg) Invoke a static method whose parameter type matches exactly the object type.
static java.lang.Object	invokeExactStaticMethod(java.lang.Class<?> objectClass, java.lang.String methodName, java.lang.Object[] args) Invoke a static method whose parameter types match exactly the object types.
static java.lang.Object	invokeExactStaticMethod(java.lang.Class<?> objectClass, java.lang.String methodName, java.lang.Object[] args, java.lang.Class<?>[] parameterTypes) Invoke a static method whose parameter types match exactly the parameter types given.
static java.lang.Object	invokeMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object arg) Invoke a named method whose parameter type matches the object type.
static java.lang.Object	invokeMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object[] args) Invoke a named method whose parameter type matches the object type.
static java.lang.Object	invokeMethod(java.lang.Object object, java.lang.String methodName, java.lang.Object[] args, java.lang.Class<?>[] parameterTypes) Invoke a named method whose parameter type matches the object type.
static java.lang.Object	invokeStaticMethod(java.lang.Class<?> objectClass, java.lang.String methodName, java.lang.Object arg) Invoke a named static method whose parameter type matches the object type.
static java.lang.Object	invokeStaticMethod(java.lang.Class<?> objectClass, java.lang.String methodName, java.lang.Object[] args) Invoke a named static method whose parameter type matches the object type.
static java.lang.Object	invokeStaticMethod(java.lang.Class<?> objectClass, java.lang.String methodName, java.lang.Object[] args, java.lang.Class<?>[] parameterTypes) Invoke a named static method whose parameter type matches the object type.
static boolean	isAssignmentCompatible(java.lang.Class<?> parameterType, java.lang.Class<?> parameterization) Determine whether a type can be used as a parameter in a method invocation.
static void	setCacheMethods(boolean cacheMethods) Set whether methods should be cached for greater performance or not, default is true.
static void	setTraceEnabled(boolean traceEnabled)
static java.lang.Class<?>	toNonPrimitiveClass(java.lang.Class<?> clazz) Find a non primitive representation for given primitive class.

从类继承的方法 java.lang.Object

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

构造器详细资料

MethodUtils

public MethodUtils()

方法详细资料

setTraceEnabled

public static void setTraceEnabled(boolean traceEnabled)

setCacheMethods

public static void setCacheMethods(boolean cacheMethods)

Set whether methods should be cached for greater performance or not, default is true.

参数:

cacheMethods - true if methods should be cached for greater performance, otherwise false

从以下版本开始:

1.8.0

clearCache

public static int clearCache()

Clear the method cache.

返回:

the number of cached methods cleared

从以下版本开始:

1.8.0

invokeMethod

public static java.lang.Object invokeMethod(java.lang.Object object,
                                            java.lang.String methodName,
                                            java.lang.Object arg)
                                     throws java.lang.NoSuchMethodException,
                                            java.lang.IllegalAccessException,
                                            java.lang.reflect.InvocationTargetException

Invoke a named method whose parameter type matches the object type.

The behaviour of this method is less deterministic than invokeExactMethod(). It loops through all methods with names that match and then executes the first it finds with compatible parameters.

This method supports calls to methods taking primitive parameters via passing in wrapping classes. So, for example, a Boolean class would match a boolean primitive.

This is a convenient wrapper for invokeMethod(Object object,String methodName,Object [] args).

参数:

object - invoke method on this object

methodName - get method with this name

arg - use this argument. May be null (this will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

invokeMethod

public static java.lang.Object invokeMethod(java.lang.Object object,
                                            java.lang.String methodName,
                                            java.lang.Object[] args)
                                     throws java.lang.NoSuchMethodException,
                                            java.lang.IllegalAccessException,
                                            java.lang.reflect.InvocationTargetException

Invoke a named method whose parameter type matches the object type.

The behaviour of this method is less deterministic than invokeExactMethod(Object object,String methodName,Object [] args). It loops through all methods with names that match and then executes the first it finds with compatible parameters.

This method supports calls to methods taking primitive parameters via passing in wrapping classes. So, for example, a Boolean class would match a boolean primitive.

This is a convenient wrapper for invokeMethod(Object object,String methodName,Object [] args,Class[] parameterTypes).

参数:

object - invoke method on this object

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

invokeMethod

public static java.lang.Object invokeMethod(java.lang.Object object,
                                            java.lang.String methodName,
                                            java.lang.Object[] args,
                                            java.lang.Class<?>[] parameterTypes)
                                     throws java.lang.NoSuchMethodException,
                                            java.lang.IllegalAccessException,
                                            java.lang.reflect.InvocationTargetException

Invoke a named method whose parameter type matches the object type.

The behaviour of this method is less deterministic than invokeExactMethod(Object object,String methodName,Object [] args,Class[] parameterTypes). It loops through all methods with names that match and then executes the first it finds with compatible parameters.

This method supports calls to methods taking primitive parameters via passing in wrapping classes. So, for example, a Boolean class would match a boolean primitive.

参数:

object - invoke method on this object

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

parameterTypes - match these parameters - treat null as empty array

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

invokeExactMethod

public static java.lang.Object invokeExactMethod(java.lang.Object object,
                                                 java.lang.String methodName,
                                                 java.lang.Object arg)
                                          throws java.lang.NoSuchMethodException,
                                                 java.lang.IllegalAccessException,
                                                 java.lang.reflect.InvocationTargetException

Invoke a method whose parameter type matches exactly the object type.

This is a convenient wrapper for invokeExactMethod(Object object,String methodName,Object [] args).

参数:

object - invoke method on this object

methodName - get method with this name

arg - use this argument. May be null (this will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

invokeExactMethod

public static java.lang.Object invokeExactMethod(java.lang.Object object,
                                                 java.lang.String methodName,
                                                 java.lang.Object[] args)
                                          throws java.lang.NoSuchMethodException,
                                                 java.lang.IllegalAccessException,
                                                 java.lang.reflect.InvocationTargetException

Invoke a method whose parameter types match exactly the object types.

This uses reflection to invoke the method obtained from a call to getAccessibleMethod().

参数:

object - invoke method on this object

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

invokeExactMethod

public static java.lang.Object invokeExactMethod(java.lang.Object object,
                                                 java.lang.String methodName,
                                                 java.lang.Object[] args,
                                                 java.lang.Class<?>[] parameterTypes)
                                          throws java.lang.NoSuchMethodException,
                                                 java.lang.IllegalAccessException,
                                                 java.lang.reflect.InvocationTargetException

Invoke a method whose parameter types match exactly the parameter types given.

This uses reflection to invoke the method obtained from a call to getAccessibleMethod().

参数:

object - invoke method on this object

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

parameterTypes - match these parameters - treat null as empty array

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

invokeExactStaticMethod

public static java.lang.Object invokeExactStaticMethod(java.lang.Class<?> objectClass,
                                                       java.lang.String methodName,
                                                       java.lang.Object[] args,
                                                       java.lang.Class<?>[] parameterTypes)
                                                throws java.lang.NoSuchMethodException,
                                                       java.lang.IllegalAccessException,
                                                       java.lang.reflect.InvocationTargetException

Invoke a static method whose parameter types match exactly the parameter types given.

This uses reflection to invoke the method obtained from a call to getAccessibleMethod(Class, String, Class[]).

参数:

objectClass - invoke static method on this class

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

parameterTypes - match these parameters - treat null as empty array

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

从以下版本开始:

1.8.0

invokeStaticMethod

public static java.lang.Object invokeStaticMethod(java.lang.Class<?> objectClass,
                                                  java.lang.String methodName,
                                                  java.lang.Object arg)
                                           throws java.lang.NoSuchMethodException,
                                                  java.lang.IllegalAccessException,
                                                  java.lang.reflect.InvocationTargetException

Invoke a named static method whose parameter type matches the object type.

The behaviour of this method is less deterministic than invokeExactMethod(Object, String, Object[], Class[]). It loops through all methods with names that match and then executes the first it finds with compatible parameters.

This method supports calls to methods taking primitive parameters via passing in wrapping classes. So, for example, a Boolean class would match a boolean primitive.

This is a convenient wrapper for invokeStaticMethod(Class objectClass,String methodName,Object [] args).

参数:

objectClass - invoke static method on this class

methodName - get method with this name

arg - use this argument. May be null (this will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

从以下版本开始:

1.8.0

invokeStaticMethod

public static java.lang.Object invokeStaticMethod(java.lang.Class<?> objectClass,
                                                  java.lang.String methodName,
                                                  java.lang.Object[] args)
                                           throws java.lang.NoSuchMethodException,
                                                  java.lang.IllegalAccessException,
                                                  java.lang.reflect.InvocationTargetException

Invoke a named static method whose parameter type matches the object type.

The behaviour of this method is less deterministic than invokeExactMethod(Object object,String methodName,Object [] args). It loops through all methods with names that match and then executes the first it finds with compatible parameters.

This method supports calls to methods taking primitive parameters via passing in wrapping classes. So, for example, a Boolean class would match a boolean primitive.

This is a convenient wrapper for invokeStaticMethod(Class objectClass,String methodName,Object [] args,Class[] parameterTypes).

参数:

objectClass - invoke static method on this class

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

从以下版本开始:

1.8.0

invokeStaticMethod

public static java.lang.Object invokeStaticMethod(java.lang.Class<?> objectClass,
                                                  java.lang.String methodName,
                                                  java.lang.Object[] args,
                                                  java.lang.Class<?>[] parameterTypes)
                                           throws java.lang.NoSuchMethodException,
                                                  java.lang.IllegalAccessException,
                                                  java.lang.reflect.InvocationTargetException

Invoke a named static method whose parameter type matches the object type.

The behaviour of this method is less deterministic than invokeExactStaticMethod(Class objectClass,String methodName,Object [] args,Class[] parameterTypes). It loops through all methods with names that match and then executes the first it finds with compatible parameters.

This method supports calls to methods taking primitive parameters via passing in wrapping classes. So, for example, a Boolean class would match a boolean primitive.

参数:

objectClass - invoke static method on this class

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

parameterTypes - match these parameters - treat null as empty array

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

从以下版本开始:

1.8.0

invokeExactStaticMethod

public static java.lang.Object invokeExactStaticMethod(java.lang.Class<?> objectClass,
                                                       java.lang.String methodName,
                                                       java.lang.Object arg)
                                                throws java.lang.NoSuchMethodException,
                                                       java.lang.IllegalAccessException,
                                                       java.lang.reflect.InvocationTargetException

Invoke a static method whose parameter type matches exactly the object type.

This is a convenient wrapper for invokeExactStaticMethod(Class objectClass,String methodName,Object [] args).

参数:

objectClass - invoke static method on this class

methodName - get method with this name

arg - use this argument. May be null (this will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

从以下版本开始:

1.8.0

invokeExactStaticMethod

public static java.lang.Object invokeExactStaticMethod(java.lang.Class<?> objectClass,
                                                       java.lang.String methodName,
                                                       java.lang.Object[] args)
                                                throws java.lang.NoSuchMethodException,
                                                       java.lang.IllegalAccessException,
                                                       java.lang.reflect.InvocationTargetException

Invoke a static method whose parameter types match exactly the object types.

This uses reflection to invoke the method obtained from a call to getAccessibleMethod(Class, String, Class[]).

参数:

objectClass - invoke static method on this class

methodName - get method with this name

args - use these arguments - treat null as empty array (passing null will result in calling the parameterless method with name methodName).

返回:

The value returned by the invoked method

抛出:

java.lang.NoSuchMethodException - if there is no such accessible method

java.lang.reflect.InvocationTargetException - wraps an exception thrown by the method invoked

java.lang.IllegalAccessException - if the requested method is not accessible via reflection

从以下版本开始:

1.8.0

getAccessibleMethod

public static java.lang.reflect.Method getAccessibleMethod(java.lang.Class<?> clazz,
                                                           java.lang.String methodName,
                                                           java.lang.Class<?> parameterType)

Return an accessible method (that is, one that can be invoked via reflection) with given name and a single parameter. If no such method can be found, return null. Basically, a convenience wrapper that constructs a Class array for you.

参数:

clazz - get method from this class

methodName - get method with this name

parameterType - taking this type of parameter

返回:

The accessible method

getAccessibleMethod

public static java.lang.reflect.Method getAccessibleMethod(java.lang.Class<?> clazz,
                                                           java.lang.String methodName,
                                                           java.lang.Class<?>[] parameterTypes)

Return an accessible method (that is, one that can be invoked via reflection) with given name and parameters. If no such method can be found, return null. This is just a convenient wrapper for getAccessibleMethod(Method method).

参数:

clazz - get method from this class

methodName - get method with this name

parameterTypes - with these parameters types

返回:

The accessible method

getAccessibleMethod

public static java.lang.reflect.Method getAccessibleMethod(java.lang.reflect.Method method)

Return an accessible method (that is, one that can be invoked via reflection) that implements the specified Method. If no such method can be found, return null.

参数:

method - The method that we wish to call

返回:

The accessible method

getAccessibleMethod

public static java.lang.reflect.Method getAccessibleMethod(java.lang.Class<?> clazz,
                                                           java.lang.reflect.Method method)

Return an accessible method (that is, one that can be invoked via reflection) that implements the specified Method. If no such method can be found, return null.

参数:

clazz - The class of the object

method - The method that we wish to call

返回:

The accessible method

从以下版本开始:

1.8.0

getMatchingAccessibleMethod

public static java.lang.reflect.Method getMatchingAccessibleMethod(java.lang.Class<?> clazz,
                                                                   java.lang.String methodName,
                                                                   java.lang.Class<?>[] parameterTypes)

Find an accessible method that matches the given name and has compatible parameters. Compatible parameters mean that every method parameter is assignable from the given parameters. In other words, it finds a method with the given name that will take the parameters given.

This method is slightly undeterministic since it loops through methods names and return the first matching method.

This method is used by invokeMethod(Object object,String methodName,Object [] args,Class[] parameterTypes).

This method can match primitive parameter by passing in wrapper classes. For example, a Boolean will match a primitive boolean parameter.

参数:

clazz - find method in this class

methodName - find method with this name

parameterTypes - find method with compatible parameters

返回:

The accessible method

isAssignmentCompatible

public static final boolean isAssignmentCompatible(java.lang.Class<?> parameterType,
                                                   java.lang.Class<?> parameterization)

Determine whether a type can be used as a parameter in a method invocation. This method handles primitive conversions correctly.

In order words, it will match a Boolean to a boolean, a Long to a long, a Float to a float, a Integer to a int, and a Double to a double. Now logic widening matches are allowed. For example, a Long will not match a int.

参数:

parameterType - the type of parameter accepted by the method

parameterization - the type of parameter being tested

返回:

true if the assignment is compatible.

getPrimitiveWrapper

public static java.lang.Class<?> getPrimitiveWrapper(java.lang.Class<?> primitiveType)

Gets the wrapper object class for the given primitive type class. For example, passing boolean.class returns Boolean.class

参数:

primitiveType - the primitive type class for which a match is to be found

返回:

the wrapper type associated with the given primitive or null if no match is found

getPrimitiveType

public static java.lang.Class<?> getPrimitiveType(java.lang.Class<?> wrapperType)

Gets the class for the primitive type corresponding to the primitive wrapper class given. For example, an instance of Boolean.class returns a boolean.class.

参数:

wrapperType - the

返回:

the primitive type class corresponding to the given wrapper class, null if no match is found

toNonPrimitiveClass

public static java.lang.Class<?> toNonPrimitiveClass(java.lang.Class<?> clazz)

Find a non primitive representation for given primitive class.

参数:

clazz - the class to find a representation for, not null

返回:

the original class if it not a primitive. Otherwise the wrapper class. Not null