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

public class MD5Example {
    public static String md5(String input) {
        try {
            // 创建MessageDigest实例，指定MD5算法
            MessageDigest md = MessageDigest.getInstance("MD5");
            
            // 添加要计算摘要的字节
            md.update(input.getBytes());
            
            // 获取哈希值字节数组
            byte[] digest = md.digest();
            
            // 将字节数组转换为十六进制字符串
            StringBuilder sb = new StringBuilder();
            for (byte b : digest) {
                sb.append(String.format("%02x", b & 0xff));
            }
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        String original = "Hello World";
        System.out.println("MD5 hash: " + md5(original));
    }
}

<?php
$original = "Hello World";
$hash = md5($original);
echo "MD5 hash: " . $hash;
?>