public static String getStringMD5(String sourceStr)
{ String s = null;
try {
MessageDigest md = MessageDigest.getInstance("MD5");
// The role of these two lines of code is:
// Convert the bytes array to BigInterger type. 1, means +, which is a positive number.
BigInteger bigInt = new BigInteger(1, md.digest(sourceStr.getBytes()));
// Use the format method to obtain a 32-bit hexadecimal string. 032, representing high-order 0 to 32 bits, X represents hexadecimal integer data.
// Why is 32 bits? Because the MD5 algorithm returns a 128-bit integer, we are used to express it in hexadecimal, which is 32 bits.
s = String.format("%032x", bigInt);
}
catch (NoSuchAlgorithmException e) {
e.printStackTrace ();
}
return s;
}
Author: Oak Mr.
link: https: //www.jianshu.com/p/83fc0c13104c
Source: Jane book
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