Java 中的 MessageDigest toString()方法，带示例

原文:https://www . geesforgeks . org/messagedigest-tostring-method-in-Java-with-examples/

Java . security . messagedigest类的 toString() 方法用于以字符串格式提供消息摘要的对象。

语法:

public String toString()

返回值:该方法以字符串形式返回消息摘要的对象。

以下是说明 toString() 方法的示例:

例 1:

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

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

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

            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("MD5");

            // getting the string value of msd1
            // using toString() method
            String nv = msd1.toString();

            // display the result
            System.out.println("MessageDigest : "
                               + nv);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : "
                               + e);
        }
        catch (ProviderException e) {

            System.out.println("Exception thrown : "
                               + e);
        }
    }
}

输出:

MessageDigest : MD5 Message Digest from SUN, <initialized>

例 2:

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

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

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

            // creating object of MessageDigest
            MessageDigest msd1
                = MessageDigest.getInstance("SHA-256");

            // getting the string value of msd1
            // using toString() method
            String nv = msd1.toString();

            // display the result
            System.out.println("MessageDigest : " + nv);
        }

        catch (NoSuchAlgorithmException e) {

            System.out.println("Exception thrown : " + e);
        }
        catch (ProviderException e) {

            System.out.println("Exception thrown : " + e);
        }
    }
}

输出:

MessageDigest : SHA-256 Message Digest from SUN, <initialized>

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

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