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This article mainly introduces "MD5 encryption authentication login password how to achieve", in the daily operation, I believe that many people have doubts about how to achieve MD5 encryption authentication login password. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubt of "how to realize MD5 encryption authentication login password". Next, please follow the editor to study!

Encryption means that after the data is converted, the data is changed into another format, and no one can convert the data back except the person who gets the decryption method.

Therefore, encryption is usually used for network communication. Because of the communication data on the network, anyone may get it, encrypt the data and then transmit it, and then check it after it is decrypted by the other party, so as to prevent peeping on the network.

MD5 is a commonly used encryption algorithm.

01

Tool class: MD5Util

Package com.zd.ems.util

Import java.security.MessageDigest;import java.security.NoSuchAlgorithmException

/ * MD5 encryption and decryption * * / public class MD5Util {/ * MD5 encryption method * @ param str does not allow String strings that need to be encrypted by MD5 for null. * @ return MD5 encrypted string * @ throws NoSuchAlgorithmException * / public static String EncodeByMD5 (String str) throws NoSuchAlgorithmException {/ / get an information digest MessageDigest messageDigest = MessageDigest.getInstance ("MD5") / / A byte array of length 16 byte [] weitHandleByte = messageDigest.digest (str.getBytes ()) is obtained by filling the string into the abstract and performing hash calculation; / / temporarily store weitHandleByte int tempWeitHandleByte; / / create a StringBuffer to load the encrypted character StringBuffer sb = new StringBuffer () / / iterate through the obtained byte array to generate the specific MD5 password for (byte b: weitHandleByte) {tempWeitHandleByte = b; if (tempWeitHandleByte)

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