Java 中的提供者 getInfo()方法，示例

原文:https://www . geesforgeks . org/provider-getinfo-method-in-Java-with-examples/

java.security.Provider 类的 getInfo() 方法用于返回提供者及其服务的人类可读描述。这可能会返回一个带有相关链接的网页。

语法:

public String getInfo()

返回值:该方法返回提供者及其服务的描述。

以下是说明 getInfo() 方法的例子:

例 1:

// Java program to demonstrate
// get() 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();

            // getting the info
            String info = provider.getInfo();

            // printing the string info
            System.out.println("info : " + info);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

info : 
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)

例 2:

// Java program to demonstrate
// get() method

import java.security.*;
import java.util.*;

public class GFG1 {
    public static void main(String[] argv) throws Exception
    {

        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();

            // getting the info
            String info = provider.getInfo();

            // printing the string info
            System.out.println("info : " + info);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

info : 
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)

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