Java 中的 MessageDigest getDigestLength()方法，带示例
原文:https://www . geesforgeks . org/messagedigest-getdigest length-method-in-Java-with-examples/
消息摘要类的 getDigestLength() 方法用于获取消息摘要对象的对象大小，单位为字节。
语法:
public final int getDigestLength()
返回值:该方法以字节形式提供消息摘要的长度。
以下是说明 getDigestLength() 方法的示例:
例 1:
// Java program to demonstrate
// getDigestLength() 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", "SUN");
// getting the length of MessageDigest of object msd
// by using method getDigestLength()
int length = msd.getDigestLength();
// printing the provider name
System.out.println("Message digest length : "
+ length);
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
catch (NoSuchProviderException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
Message digest length : 32
例 2:
// Java program to demonstrate
// getDigestLength() 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 the length of MessageDigest of object msd
// by using method getDigestLength()
int length = msd.getDigestLength();
// printing the provider name
System.out.println("Message digest length : "
+ length);
}
catch (NoSuchAlgorithmException e) {
System.out.println("Exception thrown : " + e);
}
}
}
输出:
Message digest length : 16
参考:https://docs . Oracle . com/javase/9/docs/API/Java/security/messagedigest . html # getDigestLength–
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