<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.10</version>
</dependency>

import org.apache.commons.codec.digest.DigestUtils;

public class CodeDemo {
    public static void main(String[] args) {
        System.out.println(DigestUtils.md5Hex("hello"));
        // 5d41402abc4b2a76b9719d911017c592
    }
}