Java中的提供程序get()方法
可以使用类java.security.Provider中的get()方法获取键所映射到的值。此方法需要一个参数,即需要其值的键。它返回键所映射的值;如果不存在键所映射的值,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) {
try {
SecureRandom sRandom = SecureRandom.getInstance("SHA1PRNG");
Provider p = sRandom.getProvider();
Set<Object> set = p.keySet();
Iterator i = set.iterator();
int x = 30;
while (x > 0) {
Object val = p.get(i.next());
System.out.println(val);
x--;
}
} catch (NoSuchAlgorithmException e) {
System.out.println("Error!!! NoSuchAlgorithmException");
}
}
}
上面程序的输出如下-
输出结果
SHA1withDSASHA1withDSA
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
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