Obtain the MD5 value of the file and compare whether the two files are identical.

Code:

Public class md5test {public static void main (string [] ARGs) {string S1 = md5test. md5operation (new file ("E:/a.csv"); string S2 = md5test. md5operation (new file ("E:/data/a.csv"); system. out. println (s1.equals (S2);} public final static string md5operation (File file) {try {messagedigest MD = messagedigest. getinstance ("MD5"); // use the fileut class method of the commons-io package, greatly simplifying the code. Byte temp [] = fileutils. readfiletobytearray (File); Md. update (temp); byte B [] = md. digest (); // use Java. the biginteger class of the math package, which implements hexadecimal conversion of biginteger bigint = new biginteger (1, B); Return bigint. tostring (16) ;}catch (exception e) {return NULL ;}}}