JAVA中MD5加密（MD5工具类）

亦凉 2023-10-18 13:32 133阅读 0赞

转自：[https://blog.csdn.net/starry7953810/article/details/79924156][https_blog.csdn.net_starry7953810_article_details_79924156]

为什么只有加密，没有解密呢？欢迎大佬留言解答

package utilw;
    
    import java.security.MessageDigest;
    
    public class MD5 {
    	/** MD5 */
    	private static final String hexDigIts[] = { "0", "1", "2", "3", "4", "5",
    			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
    
    	/** MD5加密 */
    	public static String MD5Encode(String origin, String charsetname) {
    		String resultString = null;
    		try {
    			resultString = new String(origin);
    			MessageDigest md = MessageDigest.getInstance("MD5");
    			if (null == charsetname || "".equals(charsetname)) {
    				resultString = byteArrayToHexString(md.digest(resultString
    						.getBytes()));
    			} else {
    				resultString = byteArrayToHexString(md.digest(resultString
    						.getBytes(charsetname)));
    			}
    		} catch (Exception e) {
    		}
    		return resultString;
    	}
    
    	public static String byteArrayToHexString(byte b[]) {
    		StringBuffer resultSb = new StringBuffer();
    		for (int i = 0; i < b.length; i++) {
    			resultSb.append(byteToHexString(b[i]));
    		}
    		return resultSb.toString();
    	}
    
    	public static String byteToHexString(byte b) {
    		int n = b;
    		if (n < 0) {
    			n += 256;
    		}
    		int d1 = n / 16;
    		int d2 = n % 16;
    		return hexDigIts[d1] + hexDigIts[d2];
    	}
    
    	public static void main(String[] args) {
    		System.out.println(MD5Encode("12345", "utf8"));
    	}
    }

[https_blog.csdn.net_starry7953810_article_details_79924156]: https://blog.csdn.net/starry7953810/article/details/79924156