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Java Provider elements()用法及代碼示例


java.security.Provider類的elements()方法用於返回給定hashTable中的值的枚舉。

用法:

public Enumeration<Object> elements()

返回值：此方法返回哈希表中的值的枚舉。


下麵是說明elements()方法的示例：

示例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: \n"); 
  
            while (enume.hasMoreElements()) { 
                System.out.println("Value is: " + enume.nextElement()); 
            } 
        } 
  
        catch (NoSuchAlgorithmException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}
輸出： 
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

示例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: \n"); 
            while (enume.hasMoreElements()) { 
                System.out.println("Value is: " + enume.nextElement()); 
            } 
        } 
  
        catch (NoSuchAlgorithmException e) { 
  
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}
輸出： 
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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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Provider elements() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。