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Added in API level 1
Summary: Protected Ctors | Protected Methods | Inherited Methods | [Expand All]

SecureClassLoader

public class SecureClassLoader
extends ClassLoader

java.lang.Object
    java.lang.ClassLoader
      java.security.SecureClassLoader
Known Direct Subclasses

该类扩展了ClassLoader，额外支持定义具有相关代码源和权限的类，这些代码源和权限默认由系统策略检索。

摘要(Summary)

Protected constructors
SecureClassLoader(ClassLoader parent)

使用指定的父类加载器为委派创建新的SecureClassLoader。
SecureClassLoader()

使用用于委派的默认父类加载器创建新的SecureClassLoader。

Protected methods
final Class<?> defineClass(String name, byte[] b, int off, int len, CodeSource cs)

使用可选的CodeSource将字节数组转换为类Class的实例。
final Class<?> defineClass(String name, ByteBuffer b, CodeSource cs)

使用可选的CodeSource将 ByteBuffer转换为类 Class的实例。
PermissionCollection getPermissions(CodeSource codesource)

返回给定CodeSource对象的权限。

继承方法(Inherited methods)
From class java.lang.ClassLoader
From class java.lang.Object

Protected constructors

SecureClassLoader

Added in API level 1 
SecureClassLoader (ClassLoader parent)

使用指定的父类加载器为委派创建新的SecureClassLoader。

如果存在安全管理器，则此方法首先调用安全管理器的方法 checkCreateClassLoader以确保允许创建类加载器。

参数(Parameters)
parent ClassLoader: the parent ClassLoader
抛出异常(Throws)
SecurityException if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.

也可以看看：

SecureClassLoader

Added in API level 1 
SecureClassLoader ()

使用用于委派的默认父类加载器创建新的SecureClassLoader。

如果有安全管理器，则此方法首先调用安全管理器的 checkCreateClassLoader方法以确保允许创建类加载器。

抛出异常(Throws)
SecurityException if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.

也可以看看：

Protected methods

defineClass

Added in API level 1 
Class<?> defineClass (String name, 
                byte[] b, 
                int off, 
                int len, 
                CodeSource cs)

使用可选的CodeSource将字节数组转换为类Class的实例。 在课程可以使用之前，必须解决。

如果提供了非空的CodeSource，则构造一个ProtectionDomain并将其与正在定义的类关联。

参数(Parameters)
name String: the expected name of the class, or null if not known, using '.' and not '/' as the separator and without a trailing ".class" suffix.
b byte: the bytes that make up the class data. The bytes in positions off through off+len-1 should have the format of a valid class file as defined by The JavaTM Virtual Machine Specification.
off int: the start offset in b of the class data
len int: the length of the class data
cs CodeSource: the associated CodeSource, or null if none
返回(Returns)
Class<?> the Class object created from the data, and optional CodeSource.
抛出异常(Throws)
ClassFormatError if the data did not contain a valid class
IndexOutOfBoundsException if either off or len is negative, or if off+len is greater than b.length.
SecurityException if an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if the class name begins with "java.".

defineClass

Added in API level 1 
Class<?> defineClass (String name, 
                ByteBuffer b, 
                CodeSource cs)

使用可选的CodeSource将ByteBuffer转换为类Class的实例。 在课程可以使用之前，必须解决。

如果提供了非空的CodeSource，则构造一个ProtectionDomain并将其与正在定义的类关联。

参数(Parameters)
name String: the expected name of the class, or null if not known, using '.' and not '/' as the separator and without a trailing ".class" suffix.
b ByteBuffer: the bytes that make up the class data. The bytes from positions b.position() through b.position() + b.limit() -1 should have the format of a valid class file as defined by The JavaTM Virtual Machine Specification.
cs CodeSource: the associated CodeSource, or null if none
返回(Returns)
Class<?> the Class object created from the data, and optional CodeSource.
抛出异常(Throws)
ClassFormatError if the data did not contain a valid class
SecurityException if an attempt is made to add this class to a package that contains classes that were signed by a different set of certificates than this class, or if the class name begins with "java.".

getPermissions

Added in API level 1 
PermissionCollection getPermissions (CodeSource codesource)

返回给定CodeSource对象的权限。

此方法由defineClass方法调用，该方法在为正在定义的类构造ProtectionDomain时将CodeSource作为参数。

参数(Parameters)
codesource CodeSource: the codesource.
返回(Returns)
PermissionCollection the permissions granted to the codesource.
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