Java中的 AlgorithmParameterGenerator getProvider() 方法及示例

Java.security.AlgorithmParameterGenerator类的getProvider()方法用于返回该算法参数生成器对象的提供者。
句法：

public final Provider getProvider()

返回值：此方法返回此算法参数生成器对象的提供者。
以下是说明 getProvider() 方法的示例：
示例 1：对于算法DSA

Java

// Java program to demonstrate
// getAlgorithm() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
            // creating the object of
            // AlgorithmParameterGenerator
            // and getting instance
            // using getInstance() method
            AlgorithmParameterGenerator
                sr
                = AlgorithmParameterGenerator
                      .getInstance("DSA");
 
            // initializing the AlgorithmParameterGenerator
            // with 1024 using initialize() method
            sr.init(1024);
 
            // generating the Parameters
            // using getAlgorithm() method
            Provider pro = sr.getProvider();
 
            // printing the string algo
            System.out.println("Provider : " + pro);
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

Provider : SUN version 1.8

示例 2：对于算法DiffieHellman

Java

// Java program to demonstrate
// getAlgorithm() method
 
import java.security.*;
import java.util.*;
 
public class GFG1 {
    public static void main(String[] argv)
    {
        try {
            // creating the object of
            // AlgorithmParameterGenerator
            // and getting instance
            // using getInstance() method
            AlgorithmParameterGenerator
                sr
                = AlgorithmParameterGenerator
                      .getInstance("DiffieHellman");
 
            // initializing the AlgorithmParameterGenerator
            // with 1024 using initialize() method
            sr.init(1024);
 
            // generating the Parameters
            // using getAlgorithm() method
            Provider pro = sr.getProvider();
 
            // printing the string algo
            System.out.println("Provider : " + pro);
        }
 
        catch (NoSuchAlgorithmException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

输出：

Provider : SunJCE version 1.8