Java中的提供者getProperty()方法

使用getProperty()类java.security.Provider中的方法，可以使用特定键在属性列表中搜索所需的属性。此方法需要一个参数，即搜索属性所需的键。它返回键的属性值；如果该属性值不可用，则返回null。

演示此的程序如下所示-

示例

import java.security.*;
import java.util.*;
public class Demo {
   public static void main(String[] argv) throws Exception {
      try {
         KeyPairGenerator kpGenerator = KeyPairGenerator.getInstance("DSA");
         Provider p = kpGenerator.getProvider();
         Set<Object> s = p.keySet();
         Iterator i = s.iterator();
         int x = 30;
         while (x > 0) {
            System.out.println(p.getProperty((String)i.next()));
            x--;
         }
      } catch (NoSuchAlgorithmException e) {
         System.out.println("Error!!! NoSuchAlgorithmException");
      }
   }
}

输出结果

SHA1withDSA
SHA1withDSA
SHA1withDSA
Software
sun.security.provider.JavaKeyStore$DualFormatJKS
SHA
sun.security.provider.SHA
sun.security.provider.JavaKeyStore$CaseExactJKS
Software
sun.security.provider.DSA$SHA256withDSA
SHA
SHA1withDSA
Software
Software
Software
sun.security.provider.DSA$RawDSA
X.509
java.security.interfaces.DSAPublicKey|java.security.interfaces.DSAPrivateKey
sun.security.provider.certpath.IndexedCollectionCertStore
sun.security.provider.Sun
SHA
SHA1withDSA
sun.security.provider.DomainKeyStore$DKS
Software
SHA256withDSA
SHA224withDSA
1024
1024
Software
sun.security.provider.DSAKeyFactory