Java中的 MessageDigest toString() 方法及示例

Java.security.MessageDigest类的toString()方法用于提供字符串格式的消息摘要对象。

句法：

public String toString()

返回值：该方法以字符串格式返回消息摘要的对象。

下面是说明toString()方法的示例：

示例 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, 

示例 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, 

参考： https://docs.oracle.com/javase/9/docs/api/ Java/security/MessageDigest.html#toString–