Java中的 KeyFactory getProvider() 方法及示例

Java.security.KeyFactory类的getProvider()方法用于获取此KeyFactory 实例使用的Provider 对象的名称。

句法：

public final Provider getProvider()

参数：此方法不接受任何参数。

返回值：此方法返回此 KeyFactory 实例使用的Provider 对象的名称。

以下是说明getProvider()方法的示例：

示例 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

示例 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–