Class java.security.Security - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.security.Security

java.lang.Object
   |
   +----java.security.Security

public final class Security
extends Object

This class centralizes all security properties and common security methods. One of its primary uses is to manage providers.

addProvider(Provider): Adds a provider to the next position available.
getAlgorithmProperty(String, String): Gets a specified property for an algorithm.
getProperty(String): Gets a security property.
getProvider(String): Returns the provider installed with the specified name, if any.
getProviders(): Returns all providers currently installed.
insertProviderAt(Provider, int): Adds a new provider, at a specified position.
removeProvider(String): Removes the provider with the specified name.
setProperty(String, String): Sets a security property.

getAlgorithmProperty

 public static String getAlgorithmProperty(String algName,
                                           String propName)

Gets a specified property for an algorithm. The algorithm name should be a standard name. See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard algorithm names. One possible use is by specialized algorithm parsers, which may map classes to algorithms which they understand (much like Key parsers do).

Parameters:: algName - the algorithm name.; propName - the name of the property to get.
Returns:: the value of the specified property.

insertProviderAt

 public static int insertProviderAt(Provider provider,
                                    int position)

Adds a new provider, at a specified position. The position is the preference order in which providers are searched for requested algorithms. Note that it is not guaranteed that this preference will be respected. The position is 1-based, that is, 1 is most preferred, followed by 2, and so on. Sometimes it will be legal to add a provider, but only in the last position, in which case the position argument will be ignored.

If the given provider is installed at the requested position, the provider that used to be at that position, and all providers with a position greater than position, are shifted up one position (towards the end of the list of installed providers).

A provider cannot be added if it is already installed.

Parameters:: provider - the provider to be added.; position - the preference position that the caller would like for this provider.
Returns:: the actual preference position in which the provider was added, or -1 if the provider was not added because it is already installed.
See Also:: getProvider, removeProvider

addProvider

 public static int addProvider(Provider provider)

Adds a provider to the next position available.

Parameters:: provider - the provider to be added.
Returns:: the preference position in which the provider was added, or -1 if the provider was not added because it is already installed.
See Also:: getProvider, removeProvider

removeProvider

 public static void removeProvider(String name)

Removes the provider with the specified name.

When the specified provider is removed, all providers located at a position greater than where the specified provider was are shifted down one position (towards the head of the list of installed providers).

This method returns silently if the provider is not installed.

Parameters:: name - the name of the provider to remove.
See Also:: getProvider, addProvider

getProviders

 public static Provider[] getProviders()

Returns all providers currently installed.

Returns:: an array of all providers currently installed.

getProvider

 public static Provider getProvider(String name)

Returns the provider installed with the specified name, if any. Returns null if no provider with the speicified name is installed.

Parameters:: name - the name of the provider to get.
Returns:: the provider of the specified name.
See Also:: removeProvider, addProvider

getProperty

 public static String getProperty(String key)

Gets a security property.

Parameters:: key - the key of the property being retrieved.
Returns:: the valeu of the security property corresponding to key.

setProperty

 public static void setProperty(String key,
                                String datum)

Sets a security property.

Parameters:: key - the name of the property to be set.; datum - the value of the property to be set.

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