Java 中的 KeyFactory getProvider()方法，带示例

原文:https://www . geesforgeks . org/key factory-getprovider-method-in-Java-with-examples/

java.security.KeyFactory 类的 getProvider() 方法用于获取此 KeyFactory 实例使用的提供程序的对象的名称。

语法:

public final Provider getProvider()

参数:该方法不取任何参数。

返回值:该方法返回此密钥工厂实例使用的 提供程序的对象的名称。

以下是说明 getProvider() 方法的示例:

例 1:

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

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

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

        try {
            // creating object of keyfactory
            KeyFactory keyFactory
                = KeyFactory.getInstance("DSA");

            // getting the Provider
            // of the KeyFactory keyfactory
            // by using method getProvider()
            Provider provider
                = keyFactory.getProvider();

            // printing the provider name
            System.out.println(
                "Provider name: "
                + provider.getName());
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println(e);
        }
    }
}

输出:

Provider name: SUN

例 2:

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

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

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

        try {

            // creating the object of KeyFactory
            KeyFactory sr
                = KeyFactory
                      .getInstance("DiffieHellman");

            // getting the Provider of the KeyFactory sr
            // by using method getProvider()
            Provider provider = sr.getProvider();

            // printing the provider name
            System.out.println(
                "Provider name: "
                + provider.getName());
        }

        catch (NoSuchAlgorithmException e) {
            System.out.println(e);
        }
    }
}

输出:

Provider name: SunJCE

参考:https://docs . Oracle . com/javase/9/docs/API/Java/security/keyfactory . html # getProvider–

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