Java中的Provider elements（）方法及其示例

469

这个 元素（） 方法 JAVA安全供应商 类用于返回给定哈希表中的值的枚举。

null

语法： 

public Enumeration<Object> elements()

返回值： 此方法返回一个 列举 哈希表中的值。

下面是一些例子来说明 元素（） 方法：

例1：

// Java program to demonstrate
// elements() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating the object of SecureRandom
SecureRandom sr = SecureRandom.getInstance( "SHA1PRNG" );
// getting the Provider of the SecureRandom sr
// by using method getProvider()
Provider provider = sr.getProvider();
// printing the Provider
System.out.println( "Provider of the SHA1PRNG: " + provider);
// Declaring the variable of Enumeration<Object> type
Enumeration<Object> enume;
// getting the enumeration of the values
enume = provider.elements();
// printing the enummerated value
System.out.println( "Enumeration of the values: " );
while (enume.hasMoreElements()) {
System.out.println( "Value is: " + enume.nextElement());
}
}
catch (NoSuchAlgorithmException e) {
System.out.println( "Exception thrown : " + e);
}
}
} 





         








     输出：    


Provider of the SHA1PRNG: SUN version 1.8
Enumeration of the values: 

Value is: SHA1withDSA
Value is: SHA1withDSA
Value is: SHA1withDSA
Value is: Software
Value is: sun.security.provider.JavaKeyStore$DualFormatJKS
Value is: SHA
Value is: sun.security.provider.SHA
Value is: sun.security.provider.JavaKeyStore$CaseExactJKS
Value is: Software
Value is: sun.security.provider.DSA$SHA256withDSA
Value is: SHA
Value is: SHA1withDSA
Value is: Software
Value is: Software
Value is: Software
Value is: sun.security.provider.DSA$RawDSA
Value is: X.509
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.certpath.IndexedCollectionCertStore
Value is: sun.security.provider.Sun
Value is: SHA
Value is: SHA1withDSA
Value is: sun.security.provider.DomainKeyStore$DKS
Value is: Software
Value is: SHA256withDSA
Value is: SHA224withDSA
Value is: 1024
Value is: 1024
Value is: Software
Value is: sun.security.provider.DSAKeyFactory
Value is: sun.security.provider.ConfigFile$Spi
Value is: SHA1withDSA
Value is: SHA-224
Value is: DSA
Value is: Software
Value is: SHA-512
Value is: SHA-384
Value is: SHA-256
Value is: NONEwithDSA
Value is: SUN
Value is: DSA
Value is: RFC3280
Value is: sun.security.provider.PolicySpiFile
Value is: 2048
Value is: DSA
Value is: DSA
Value is: SHA1withDSA
Value is: DSA
Value is: sun.security.provider.SHA5$SHA384
Value is: sun.security.provider.SHA2$SHA224
Value is: Software
Value is: sun.security.provider.DSAParameterGenerator
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.NativePRNG$Blocking
Value is: sun.security.provider.SHA5$SHA512
Value is: DSA
Value is: sun.security.provider.certpath.SunCertPathBuilder
Value is: SHA1withDSA
Value is: SHA-224
Value is: Software
Value is: SHA-512
Value is: 1.8
Value is: SHA-384
Value is: 2048
Value is: SHA-256
Value is: sun.security.provider.DSAParameters
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.certpath.CollectionCertStore
Value is: Software
Value is: sun.security.provider.NativePRNG$NonBlocking
Value is: 2048
Value is: sun.security.provider.certpath.ldap.LDAPCertStore
Value is: sun.security.provider.X509Factory
Value is: SHA256withDSA
Value is: SHA224withDSA
Value is: sun.security.provider.NativePRNG
Value is: RFC2587
Value is: Software
Value is: Software
Value is: RFC3280
Value is: Software
Value is: sun.security.provider.DSA$SHA224withDSA
Value is: SHA1withDSA
Value is: sun.security.provider.certpath.PKIXCertPathValidator
Value is: SHA
Value is: 2048
Value is: sun.security.provider.SecureRandom
Value is: sun.security.provider.DSA$SHA1withDSA
Value is: DSA
Value is: Software
Value is: sun.security.provider.DSAKeyPairGenerator$Current
Value is: SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests; SecureRandom; X.509 certificates; JKS & DKS keystores; PKIX CertPathValidator; PKIX CertPathBuilder; LDAP, Collection CertStores, JavaPolicy Policy; JavaLoginConfig Configuration)
Value is: DSA
Value is: SHA1withDSA
Value is: sun.security.provider.MD5
Value is: SHA1withDSA
Value is: sun.security.provider.SHA2$SHA256
Value is: DSA
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.MD2





     例2：   










                  


      


                                         


      


                    


      


                                                              






















                     // Java program to demonstrate                   


                     // elements() method                   


                             


                     import                               java.security.*;                   


                     import                               java.util.*;                   


                             


                     public                               class                               GFG1 {                   


                                         public                               static                               void                               main(String[] argv)                               throws                               Exception                   


                                         {                   


                             


                                         try                               {                   


                                         // creating the object of  KeyPairGenerator                   


                                         KeyPairGenerator sr = KeyPairGenerator.getInstance(                               "DSA"                               ,                               "SUN"                               );                   


                             


                                         // getting the Provider of the KeyPairGenerator sr                   


                                         // by using method getProvider()                   


                                         Provider provider = sr.getProvider();                   


                             


                                         // printing the Provider                   


                                         System.out.println(                               "Provider of the DSA, SUN: "                               + provider);                   


                             


                                         // Declaring the variable of Enumeration<Object> type                   


                                         Enumeration<Object> enume;                   


                             


                                         // getting the enumeration of the values                   


                                         enume = provider.elements();                   


                             


                                         // printing the enummerated value                   


                                         System.out.println(                               "enumeration of the values: "                               );                   


                                         while                               (enume.hasMoreElements()) {                   


                                         System.out.println(                               "Value is: "                               + enume.nextElement());                   


                                         }                   


                                         }                   


                             


                                         catch                               (NoSuchAlgorithmException e) {                   


                             


                                         System.out.println(                               "Exception thrown : "                               + e);                   


                                         }                   


                                         }                   


                     }                   












  






         






         








     输出：    


Provider of the DSA, SUN: SUN version 1.8
enumeration of the values: 

Value is: SHA1withDSA
Value is: SHA1withDSA
Value is: SHA1withDSA
Value is: Software
Value is: sun.security.provider.JavaKeyStore$DualFormatJKS
Value is: SHA
Value is: sun.security.provider.SHA
Value is: sun.security.provider.JavaKeyStore$CaseExactJKS
Value is: Software
Value is: sun.security.provider.DSA$SHA256withDSA
Value is: SHA
Value is: SHA1withDSA
Value is: Software
Value is: Software
Value is: Software
Value is: sun.security.provider.DSA$RawDSA
Value is: X.509
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.certpath.IndexedCollectionCertStore
Value is: sun.security.provider.Sun
Value is: SHA
Value is: SHA1withDSA
Value is: sun.security.provider.DomainKeyStore$DKS
Value is: Software
Value is: SHA256withDSA
Value is: SHA224withDSA
Value is: 1024
Value is: 1024
Value is: Software
Value is: sun.security.provider.DSAKeyFactory
Value is: sun.security.provider.ConfigFile$Spi
Value is: SHA1withDSA
Value is: SHA-224
Value is: DSA
Value is: Software
Value is: SHA-512
Value is: SHA-384
Value is: SHA-256
Value is: NONEwithDSA
Value is: SUN
Value is: DSA
Value is: RFC3280
Value is: sun.security.provider.PolicySpiFile
Value is: 2048
Value is: DSA
Value is: DSA
Value is: SHA1withDSA
Value is: DSA
Value is: sun.security.provider.SHA5$SHA384
Value is: sun.security.provider.SHA2$SHA224
Value is: Software
Value is: sun.security.provider.DSAParameterGenerator
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.NativePRNG$Blocking
Value is: sun.security.provider.SHA5$SHA512
Value is: DSA
Value is: sun.security.provider.certpath.SunCertPathBuilder
Value is: SHA1withDSA
Value is: SHA-224
Value is: Software
Value is: SHA-512
Value is: 1.8
Value is: SHA-384
Value is: 2048
Value is: SHA-256
Value is: sun.security.provider.DSAParameters
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.certpath.CollectionCertStore
Value is: Software
Value is: sun.security.provider.NativePRNG$NonBlocking
Value is: 2048
Value is: sun.security.provider.certpath.ldap.LDAPCertStore
Value is: sun.security.provider.X509Factory
Value is: SHA256withDSA
Value is: SHA224withDSA
Value is: sun.security.provider.NativePRNG
Value is: RFC2587
Value is: Software
Value is: Software
Value is: RFC3280
Value is: Software
Value is: sun.security.provider.DSA$SHA224withDSA
Value is: SHA1withDSA
Value is: sun.security.provider.certpath.PKIXCertPathValidator
Value is: SHA
Value is: 2048
Value is: sun.security.provider.SecureRandom
Value is: sun.security.provider.DSA$SHA1withDSA
Value is: DSA
Value is: Software
Value is: sun.security.provider.DSAKeyPairGenerator$Current
Value is: SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests; SecureRandom; X.509 certificates; JKS & DKS keystores; PKIX CertPathValidator; PKIX CertPathBuilder; LDAP, Collection CertStores, JavaPolicy Policy; JavaLoginConfig Configuration)
Value is: DSA
Value is: SHA1withDSA
Value is: sun.security.provider.MD5
Value is: SHA1withDSA
Value is: sun.security.provider.SHA2$SHA256
Value is: DSA
Value is: java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
Value is: sun.security.provider.MD2





 


                    

        
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