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📜  Java中的 Provider elements() 方法及示例

📅  最后修改于: 2022-05-13 01:55:37.146000             🧑  作者: Mango

Java中的 Provider elements() 方法及示例

Java.security.Provider类的elements()方法用于返回给定hashTable 中值的枚举。
句法： 

public Enumeration elements()
返回值：此方法返回哈希表中值的枚举。
以下是说明elements()方法的示例：
示例 1：
Java
// 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 type
            Enumeration enume;
 
            // getting the enumeration of the values
            enume = provider.elements();
 
            // printing the enumerated 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);
        }
    }
}
Java
// 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 type
            Enumeration enume;
 
            // getting the enumeration of the values
            enume = provider.elements();
 
            // printing the enumerated 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);
        }
    }
}
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
示例 2：
Java
// 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 type
            Enumeration enume;
 
            // getting the enumeration of the values
            enume = provider.elements();
 
            // printing the enumerated 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);
        }
    }
}

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