Java MessageDigest toString()用法及代码示例

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。

用法:

public String toString()

返回值：此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, <initialized>

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, <initialized>

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

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 MessageDigest toString() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。