代码：

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");			//采用commons-io包的FileUt类的方法，极大地简化了代码。			byte temp[] = FileUtils.readFileToByteArray(file);			md.update(temp);			byte b[] = md.digest();			//采用java.math包的BigInteger类，实现十六进制的转换			BigInteger bigInt = new BigInteger(1, b);			return bigInt.toString(16);		} catch (Exception e) {			return null;		}          }}