Java 中的 MessageDigest getProvider()方法，带示例
原文:https://www . geesforgeks . org/messagedigest-getprovider-method-in-Java-with-examples/
Java . security . messagedigest类的方法 getProvider() 用于获取该消息摘要的提供者。
语法:
public final Provider getProvider()
返回值:这个方法返回这个 MessageDigest 的提供者。
以下是说明 getProvider()方法的示例:
示例 1: 对于算法 MD5
// Java program to demonstrate
// getAlgorithm() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating object of MessageDigest
MessageDigest msd
= MessageDigest.getInstance("MD5");
// getting provider used in object msd
// using getAlgorithm() method
Provider pro = msd.getProvider();
// display the provider
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 SHA-256
// Java program to demonstrate
// getAlgorithm() method
import java.security.*;
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
try {
// creating object of MessageDigest
MessageDigest msd
= MessageDigest.getInstance("SHA-256");
// getting provider used in object msd
// using getAlgorithm() method
Provider pro = msd.getProvider();
// display the provider
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
参考:https://docs . Oracle . com/javase/9/docs/API/Java/security/messagedigest . html # getAlgorithm–
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