程序包 com.walker.infrastructure.utils

类 ClassUtils

java.lang.Object
com.walker.infrastructure.utils.ClassUtils
public abstract class ClassUtils extends Object
Miscellaneous class utility methods. Mainly for internal use within the framework; consider Apache Commons Lang for a more comprehensive suite of class utilities.
从以下版本开始:
1.1 // * @see TypeUtils
作者:
Juergen Hoeller, Keith Donald, Rob Harrop, Sam Brannen
另请参阅:

  • 字段详细资料

    • ARRAY_SUFFIX

      public static final String ARRAY_SUFFIX
      Suffix for array class names: "[]"
      另请参阅:

    • CGLIB_CLASS_SEPARATOR

      public static final String CGLIB_CLASS_SEPARATOR
      The CGLIB class separator character "$$"
      另请参阅:

    • CLASS_FILE_SUFFIX

      public static final String CLASS_FILE_SUFFIX
      The ".class" file suffix
      另请参阅:

  • 构造器详细资料

    • ClassUtils

      public ClassUtils()

  • 方法详细资料

    • getDefaultClassLoader

      public static ClassLoader getDefaultClassLoader()
      Return the default ClassLoader to use: typically the thread context ClassLoader, if available; the ClassLoader that loaded the ClassUtils class will be used as fallback.

      Call this method if you intend to use the thread context ClassLoader in a scenario where you absolutely need a non-null ClassLoader reference: for example, for class path resource loading (but not necessarily for Class.forName, which accepts a null ClassLoader reference as well).

      返回:
      the default ClassLoader (never null)
      另请参阅:

    • overrideThreadContextClassLoader

      public static ClassLoader overrideThreadContextClassLoader(ClassLoader classLoaderToUse)
      Override the thread context ClassLoader with the environment's bean ClassLoader if necessary, i.e. if the bean ClassLoader is not equivalent to the thread context ClassLoader already.
      参数:
      classLoaderToUse - the actual ClassLoader to use for the thread context
      返回:
      the original thread context ClassLoader, or null if not overridden

    • forName

      @Deprecated public static Class<?> forName(String name) throws ClassNotFoundException, LinkageError
      已过时。
      as of Spring 3.0, in favor of specifying a ClassLoader explicitly: see forName(String, ClassLoader)
      Replacement for Class.forName() that also returns Class instances for primitives (like "int") and array class names (like "String[]").

      Always uses the default class loader: that is, preferably the thread context class loader, or the ClassLoader that loaded the ClassUtils class as fallback.

      参数:
      name - the name of the Class
      返回:
      Class instance for the supplied name
      抛出:
      ClassNotFoundException - if the class was not found
      LinkageError - if the class file could not be loaded
      另请参阅:

    • forName

      public static Class<?> forName(String name, ClassLoader classLoader) throws ClassNotFoundException, LinkageError
      Replacement for Class.forName() that also returns Class instances for primitives (e.g."int") and array class names (e.g. "String[]"). Furthermore, it is also capable of resolving inner class names in Java source style (e.g. "java.lang.Thread.State" instead of "java.lang.Thread$State").
      参数:
      name - the name of the Class
      classLoader - the class loader to use (may be null, which indicates the default class loader)
      返回:
      Class instance for the supplied name
      抛出:
      ClassNotFoundException - if the class was not found
      LinkageError - if the class file could not be loaded
      另请参阅:

    • resolveClassName

      public static Class<?> resolveClassName(String className, ClassLoader classLoader) throws IllegalArgumentException
      Resolve the given class name into a Class instance. Supports primitives (like "int") and array class names (like "String[]").

      This is effectively equivalent to the forName method with the same arguments, with the only difference being the exceptions thrown in case of class loading failure.

      参数:
      className - the name of the Class
      classLoader - the class loader to use (may be null, which indicates the default class loader)
      返回:
      Class instance for the supplied name
      抛出:
      IllegalArgumentException - if the class name was not resolvable (that is, the class could not be found or the class file could not be loaded)
      另请参阅:

    • resolvePrimitiveClassName

      public static Class<?> resolvePrimitiveClassName(String name)
      Resolve the given class name as primitive class, if appropriate, according to the JVM's naming rules for primitive classes.

      Also supports the JVM's internal class names for primitive arrays. Does not support the "[]" suffix notation for primitive arrays; this is only supported by forName(String, ClassLoader).

      参数:
      name - the name of the potentially primitive class
      返回:
      the primitive class, or null if the name does not denote a primitive class or primitive array class

    • isPresent

      @Deprecated public static boolean isPresent(String className)
      已过时。
      as of Spring 2.5, in favor of isPresent(String, ClassLoader)
      Determine whether the Class identified by the supplied name is present and can be loaded. Will return false if either the class or one of its dependencies is not present or cannot be loaded.
      参数:
      className - the name of the class to check
      返回:
      whether the specified class is present

    • isPresent

      public static boolean isPresent(String className, ClassLoader classLoader)
      Determine whether the Class identified by the supplied name is present and can be loaded. Will return false if either the class or one of its dependencies is not present or cannot be loaded.
      参数:
      className - the name of the class to check
      classLoader - the class loader to use (may be null, which indicates the default class loader)
      返回:
      whether the specified class is present

    • getUserClass

      public static Class<?> getUserClass(Object instance)
      Return the user-defined class for the given instance: usually simply the class of the given instance, but the original class in case of a CGLIB-generated subclass.
      参数:
      instance - the instance to check
      返回:
      the user-defined class

    • getUserClass

      public static Class<?> getUserClass(Class<?> clazz)
      Return the user-defined class for the given class: usually simply the given class, but the original class in case of a CGLIB-generated subclass.
      参数:
      clazz - the class to check
      返回:
      the user-defined class

    • isCacheSafe

      public static boolean isCacheSafe(Class<?> clazz, ClassLoader classLoader)
      Check whether the given class is cache-safe in the given context, i.e. whether it is loaded by the given ClassLoader or a parent of it.
      参数:
      clazz - the class to analyze
      classLoader - the ClassLoader to potentially cache metadata in

    • getShortName

      public static String getShortName(String className)
      Get the class name without the qualified package name.
      参数:
      className - the className to get the short name for
      返回:
      the class name of the class without the package name
      抛出:
      IllegalArgumentException - if the className is empty

    • getShortName

      public static String getShortName(Class<?> clazz)
      Get the class name without the qualified package name.
      参数:
      clazz - the class to get the short name for
      返回:
      the class name of the class without the package name

    • getShortNameAsProperty

      public static String getShortNameAsProperty(Class<?> clazz)
      Return the short string name of a Java class in uncapitalized JavaBeans property format. Strips the outer class name in case of an inner class.
      参数:
      clazz - the class
      返回:
      the short name rendered in a standard JavaBeans property format
      另请参阅:

    • getClassFileName

      public static String getClassFileName(Class<?> clazz)
      Determine the name of the class file, relative to the containing package: e.g. "String.class"
      参数:
      clazz - the class
      返回:
      the file name of the ".class" file

    • getPackageName

      public static String getPackageName(Class<?> clazz)
      Determine the name of the package of the given class: e.g. "java.lang" for the java.lang.String class.
      参数:
      clazz - the class
      返回:
      the package name, or the empty String if the class is defined in the default package

    • getQualifiedName

      public static String getQualifiedName(Class<?> clazz)
      Return the qualified name of the given class: usually simply the class name, but component type class name + "[]" for arrays.
      参数:
      clazz - the class
      返回:
      the qualified name of the class

    • getQualifiedMethodName

      public static String getQualifiedMethodName(Method method)
      Return the qualified name of the given method, consisting of fully qualified interface/class name + "." + method name.
      参数:
      method - the method
      返回:
      the qualified name of the method

    • getDescriptiveType

      public static String getDescriptiveType(Object value)
      Return a descriptive name for the given object's type: usually simply the class name, but component type class name + "[]" for arrays, and an appended list of implemented interfaces for JDK proxies.
      参数:
      value - the value to introspect
      返回:
      the qualified name of the class

    • matchesTypeName

      public static boolean matchesTypeName(Class<?> clazz, String typeName)
      Check whether the given class matches the user-specified type name.
      参数:
      clazz - the class to check
      typeName - the type name to match

    • hasConstructor

      public static boolean hasConstructor(Class<?> clazz, Class<?>... paramTypes)
      Determine whether the given class has a public constructor with the given signature.

      Essentially translates NoSuchMethodException to "false".

      参数:
      clazz - the clazz to analyze
      paramTypes - the parameter types of the method
      返回:
      whether the class has a corresponding constructor
      另请参阅:

    • getConstructorIfAvailable

      public static <T> Constructor<T> getConstructorIfAvailable(Class<T> clazz, Class<?>... paramTypes)
      Determine whether the given class has a public constructor with the given signature, and return it if available (else return null).

      Essentially translates NoSuchMethodException to null.

      参数:
      clazz - the clazz to analyze
      paramTypes - the parameter types of the method
      返回:
      the constructor, or null if not found
      另请参阅:

    • hasMethod

      public static boolean hasMethod(Class<?> clazz, String methodName, Class<?>... paramTypes)
      Determine whether the given class has a method with the given signature.

      Essentially translates NoSuchMethodException to "false".

      参数:
      clazz - the clazz to analyze
      methodName - the name of the method
      paramTypes - the parameter types of the method
      返回:
      whether the class has a corresponding method
      另请参阅:

    • getMethodIfAvailable

      public static Method getMethodIfAvailable(Class<?> clazz, String methodName, Class<?>... paramTypes)
      Determine whether the given class has a method with the given signature, and return it if available (else return null).

      Essentially translates NoSuchMethodException to null.

      参数:
      clazz - the clazz to analyze
      methodName - the name of the method
      paramTypes - the parameter types of the method
      返回:
      the method, or null if not found
      另请参阅:

    • getMethodCountForName

      public static int getMethodCountForName(Class<?> clazz, String methodName)
      Return the number of methods with a given name (with any argument types), for the given class and/or its superclasses. Includes non-public methods.
      参数:
      clazz - the clazz to check
      methodName - the name of the method
      返回:
      the number of methods with the given name

    • hasAtLeastOneMethodWithName

      public static boolean hasAtLeastOneMethodWithName(Class<?> clazz, String methodName)
      Does the given class or one of its superclasses at least have one or more methods with the supplied name (with any argument types)? Includes non-public methods.
      参数:
      clazz - the clazz to check
      methodName - the name of the method
      返回:
      whether there is at least one method with the given name

    • getMostSpecificMethod

      public static Method getMostSpecificMethod(Method method, Class<?> targetClass)
      Given a method, which may come from an interface, and a target class used in the current reflective invocation, find the corresponding target method if there is one. E.g. the method may be IFoo.bar() and the target class may be DefaultFoo. In this case, the method may be DefaultFoo.bar(). This enables attributes on that method to be found.

      NOTE: In contrast to , this method does not resolve Java 5 bridge methods automatically. Call if bridge method resolution is desirable (e.g. for obtaining metadata from the original method definition).

      参数:
      method - the method to be invoked, which may come from an interface
      targetClass - the target class for the current invocation. May be null or may not even implement the method.
      返回:
      the specific target method, or the original method if the targetClass doesn't implement it or is null

    • getStaticMethod

      public static Method getStaticMethod(Class<?> clazz, String methodName, Class<?>... args)
      Return a public static method of a class.
      参数:
      methodName - the static method name
      clazz - the class which defines the method
      args - the parameter types to the method
      返回:
      the static method, or null if no static method was found
      抛出:
      IllegalArgumentException - if the method name is blank or the clazz is null

    • isPrimitiveWrapper

      public static boolean isPrimitiveWrapper(Class<?> clazz)
      Check if the given class represents a primitive wrapper, i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double.
      参数:
      clazz - the class to check
      返回:
      whether the given class is a primitive wrapper class

    • isPrimitiveOrWrapper

      public static boolean isPrimitiveOrWrapper(Class<?> clazz)
      Check if the given class represents a primitive (i.e. boolean, byte, char, short, int, long, float, or double) or a primitive wrapper (i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double).
      参数:
      clazz - the class to check
      返回:
      whether the given class is a primitive or primitive wrapper class

    • isPrimitiveArray

      public static boolean isPrimitiveArray(Class<?> clazz)
      Check if the given class represents an array of primitives, i.e. boolean, byte, char, short, int, long, float, or double.
      参数:
      clazz - the class to check
      返回:
      whether the given class is a primitive array class

    • isPrimitiveWrapperArray

      public static boolean isPrimitiveWrapperArray(Class<?> clazz)
      Check if the given class represents an array of primitive wrappers, i.e. Boolean, Byte, Character, Short, Integer, Long, Float, or Double.
      参数:
      clazz - the class to check
      返回:
      whether the given class is a primitive wrapper array class

    • resolvePrimitiveIfNecessary

      public static Class<?> resolvePrimitiveIfNecessary(Class<?> clazz)
      Resolve the given class if it is a primitive class, returning the corresponding primitive wrapper type instead.
      参数:
      clazz - the class to check
      返回:
      the original class, or a primitive wrapper for the original primitive type

    • isAssignable

      public static boolean isAssignable(Class<?> lhsType, Class<?> rhsType)
      Check if the right-hand side type may be assigned to the left-hand side type, assuming setting by reflection. Considers primitive wrapper classes as assignable to the corresponding primitive types.
      参数:
      lhsType - the target type
      rhsType - the value type that should be assigned to the target type
      返回:
      if the target type is assignable from the value type // * @see TypeUtils#isAssignable

    • isAssignableValue

      public static boolean isAssignableValue(Class<?> type, Object value)
      Determine if the given type is assignable from the given value, assuming setting by reflection. Considers primitive wrapper classes as assignable to the corresponding primitive types.
      参数:
      type - the target type
      value - the value that should be assigned to the type
      返回:
      if the type is assignable from the value

    • convertResourcePathToClassName

      public static String convertResourcePathToClassName(String resourcePath)
      Convert a "/"-based resource path to a "."-based fully qualified class name.
      参数:
      resourcePath - the resource path pointing to a class
      返回:
      the corresponding fully qualified class name

    • convertClassNameToResourcePath

      public static String convertClassNameToResourcePath(String className)
      Convert a "."-based fully qualified class name to a "/"-based resource path.
      参数:
      className - the fully qualified class name
      返回:
      the corresponding resource path, pointing to the class

    • addResourcePathToPackagePath

      public static String addResourcePathToPackagePath(Class<?> clazz, String resourceName)
      Return a path suitable for use with ClassLoader.getResource (also suitable for use with Class.getResource by prepending a slash ('/') to the return value). Built by taking the package of the specified class file, converting all dots ('.') to slashes ('/'), adding a trailing slash if necessary, and concatenating the specified resource name to this.
      As such, this function may be used to build a path suitable for loading a resource file that is in the same package as a class file, although is usually even more convenient.
      参数:
      clazz - the Class whose package will be used as the base
      resourceName - the resource name to append. A leading slash is optional.
      返回:
      the built-up resource path
      另请参阅:

    • classPackageAsResourcePath

      public static String classPackageAsResourcePath(Class<?> clazz)
      Given an input class object, return a string which consists of the class's package name as a pathname, i.e., all dots ('.') are replaced by slashes ('/'). Neither a leading nor trailing slash is added. The result could be concatenated with a slash and the name of a resource and fed directly to ClassLoader.getResource(). For it to be fed to Class.getResource instead, a leading slash would also have to be prepended to the returned value.
      参数:
      clazz - the input class. A null value or the default (empty) package will result in an empty string ("") being returned.
      返回:
      a path which represents the package name
      另请参阅:

    • classNamesToString

      public static String classNamesToString(Class... classes)
      Build a String that consists of the names of the classes/interfaces in the given array.

      Basically like AbstractCollection.toString(), but stripping the "class "/"interface " prefix before every class name.

      参数:
      classes - a Collection of Class objects (may be null)
      返回:
      a String of form "[com.foo.Bar, com.foo.Baz]"
      另请参阅:

    • classNamesToString

      public static String classNamesToString(Collection<Class> classes)
      Build a String that consists of the names of the classes/interfaces in the given collection.

      Basically like AbstractCollection.toString(), but stripping the "class "/"interface " prefix before every class name.

      参数:
      classes - a Collection of Class objects (may be null)
      返回:
      a String of form "[com.foo.Bar, com.foo.Baz]"
      另请参阅:

    • getAllInterfaces

      public static Class[] getAllInterfaces(Object instance)
      Return all interfaces that the given instance implements as array, including ones implemented by superclasses.
      参数:
      instance - the instance to analyze for interfaces
      返回:
      all interfaces that the given instance implements as array

    • getAllInterfacesForClass

      public static Class<?>[] getAllInterfacesForClass(Class<?> clazz)
      Return all interfaces that the given class implements as array, including ones implemented by superclasses.

      If the class itself is an interface, it gets returned as sole interface.

      参数:
      clazz - the class to analyze for interfaces
      返回:
      all interfaces that the given object implements as array

    • getAllInterfacesForClass

      public static Class<?>[] getAllInterfacesForClass(Class<?> clazz, ClassLoader classLoader)
      Return all interfaces that the given class implements as array, including ones implemented by superclasses.

      If the class itself is an interface, it gets returned as sole interface.

      参数:
      clazz - the class to analyze for interfaces
      classLoader - the ClassLoader that the interfaces need to be visible in (may be null when accepting all declared interfaces)
      返回:
      all interfaces that the given object implements as array

    • getAllInterfacesAsSet

      public static Set<Class> getAllInterfacesAsSet(Object instance)
      Return all interfaces that the given instance implements as Set, including ones implemented by superclasses.
      参数:
      instance - the instance to analyze for interfaces
      返回:
      all interfaces that the given instance implements as Set

    • getAllInterfacesForClassAsSet

      public static Set<Class> getAllInterfacesForClassAsSet(Class clazz)
      Return all interfaces that the given class implements as Set, including ones implemented by superclasses.

      If the class itself is an interface, it gets returned as sole interface.

      参数:
      clazz - the class to analyze for interfaces
      返回:
      all interfaces that the given object implements as Set

    • getAllInterfacesForClassAsSet

      public static Set<Class> getAllInterfacesForClassAsSet(Class clazz, ClassLoader classLoader)
      Return all interfaces that the given class implements as Set, including ones implemented by superclasses.

      If the class itself is an interface, it gets returned as sole interface.

      参数:
      clazz - the class to analyze for interfaces
      classLoader - the ClassLoader that the interfaces need to be visible in (may be null when accepting all declared interfaces)
      返回:
      all interfaces that the given object implements as Set

    • createCompositeInterface

      public static Class<?> createCompositeInterface(Class<?>[] interfaces, ClassLoader classLoader)
      Create a composite interface Class for the given interfaces, implementing the given interfaces in one single Class.

      This implementation builds a JDK proxy class for the given interfaces.

      参数:
      interfaces - the interfaces to merge
      classLoader - the ClassLoader to create the composite Class in
      返回:
      the merged interface as Class
      另请参阅:

    • isVisible

      public static boolean isVisible(Class<?> clazz, ClassLoader classLoader)
      Check whether the given class is visible in the given ClassLoader.
      参数:
      clazz - the class to check (typically an interface)
      classLoader - the ClassLoader to check against (may be null, in which case this method will always return true)

    • getFieldValueByName

      public static Object getFieldValueByName(String fieldName, Object o)
      根据对象属性名字，获取属性值，动态获取。
      参数:
      fieldName - 属性名字
      o - 对象实例
      返回: