Java中的Provider keys（）方法及其示例-yiteyi-C++库

这个 钥匙（） 方法 JAVA安全供应商 类用于返回此哈希表中键的枚举。

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语法：

public Enumeration keys()

返回值： 此方法返回 密钥的枚举 在这个哈希表中。

下面是一些例子来说明 钥匙（） 方法：

项目1：

JAVA

                         // Java program to demonstrate                       
                         // keys() method                       
           
                         import                                     java.security.*;                       
                         import                                     java.util.*;                       
           
                         public                                     class                                     GFG1 {                       
                                                 public                                     static                                     void                                     main(String[] argv)                       
                                                 {                       
                                                 // Declaring int variable                       
                                                 int                                     i =                                     10                                     ;                       
           
                                                 try                                     {                       
                                                 // creating the object of SecureRandom                       
                                                 SecureRandom sr = SecureRandom.getInstance(                                     "NativePRNGBlocking"                                     );                       
           
                                                 // getting the Provider of the SecureRandom sr                       
                                                 // by using method getProvider()                       
                                                 Provider provider = sr.getProvider();                       
           
                                                 // Declaring the variable of Enumeration<Object> type                       
                                                 Enumeration<Object> enume;                       
           
                                                 // getting the enumeration of the keys                       
                                                 enume = provider.keys();                       
           
                                                 // printing the enumerated keys                       
                                                 System.out.println(                                     "enumeration of the values: "                                     );                       
                                                 while                                     (i >                                     0                                     ) {                       
                                                 System.out.println(                                     "Value is: "                                     + enume.nextElement());                       
                                                 i--;                       
                                                 }                       
                                                 }                       
           
                                                 catch                                     (NoSuchAlgorithmException e) {                       
                                                 System.out.println(                                     "Exception thrown : "                                     + e);                       
                                                 }                       
                                                 }                       
                         }                       

输出：

enumeration of the values: Value is: Alg.Alias.Signature.SHA1/DSAValue is: Alg.Alias.Signature.1.2.840.10040.4.3Value is: Alg.Alias.Signature.DSSValue is: SecureRandom.SHA1PRNG ImplementedInValue is: KeyStore.JKSValue is: Alg.Alias.MessageDigest.SHA-1Value is: MessageDigest.SHAValue is: KeyStore.CaseExactJKSValue is: CertStore.com.sun.security.IndexedCollection ImplementedInValue is: Signature.SHA256withDSA

例2：

JAVA

                         // Java program to demonstrate                       
                         // keys() method                       
           
                         import                                     java.security.*;                       
                         import                                     java.util.*;                       
           
                         public                                     class                                     GFG1 {                       
                                                 public                                     static                                     void                                     main(String[] argv)                       
                                                 {                       
                                                 // Declaring int variable                       
                                                 int                                     i =                                     10                                     ;                       
           
                                                 try                                     {                       
                                                 // creating the object of Signature                       
                                                 Signature sr = Signature.getInstance(                                     "SHA1withDSA"                                     );                       
           
                                                 // getting the Provider of the Signature sr                       
                                                 // by using method getProvider()                       
                                                 Provider provider = sr.getProvider();                       
           
                                                 // Declaring the variable of Enumeration<Object> type                       
                                                 Enumeration<Object> enume;                       
           
                                                 // getting the enumeration of the keys                       
                                                 enume = provider.keys();                       
           
                                                 // printing the enumerated keys                       
                                                 System.out.println(                                     "enumeration of the values: "                                     );                       
                                                 while                                     (i >                                     0                                     ) {                       
                                                 System.out.println(                                     "Value is: "                                     + enume.nextElement());                       
                                                 i--;                       
                                                 }                       
                                                 }                       
           
                                                 catch                                     (NoSuchAlgorithmException e) {                       
                                                 System.out.println(                                     "Exception thrown : "                                     + e);                       
                                                 }                       
                                                 }                       
                         }                       

输出：

enumeration of the values: Value is: Alg.Alias.Signature.SHA1/DSAValue is: Alg.Alias.Signature.1.2.840.10040.4.3Value is: Alg.Alias.Signature.DSSValue is: SecureRandom.SHA1PRNG ImplementedInValue is: KeyStore.JKSValue is: Alg.Alias.MessageDigest.SHA-1Value is: MessageDigest.SHAValue is: KeyStore.CaseExactJKSValue is: CertStore.com.sun.security.IndexedCollection ImplementedInValue is: Signature.SHA256withDSA

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