package com.gh.common.util;

import java.io.ByteArrayInputStream;
import java.math.BigInteger;
import java.security.MessageDigest;

public class MD5Utils {

    public static String getUpdateMD5(String url, String content) {
        if (url == null && content == null) {
            return null;
        }
        MessageDigest digest;
        ByteArrayInputStream bais;
        byte buffer[] = new byte[1024];
        int len;
        try {
            digest = MessageDigest.getInstance("MD5");
            bais = new ByteArrayInputStream((url + content).getBytes());
            while ((len = bais.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
            bais.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }

    public static String getUrlMD5(String url) {
        if (url == null) {
            return null;
        }
        MessageDigest digest;
        ByteArrayInputStream bais;
        byte buffer[] = new byte[1024];
        int len;
        try {
            digest = MessageDigest.getInstance("MD5");
            bais = new ByteArrayInputStream(url.getBytes());
            while ((len = bais.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
            bais.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }

    public static String getContentMD5(String content) {
        if (content == null) {
            return null;
        }
        MessageDigest digest;
        ByteArrayInputStream bais;
        byte buffer[] = new byte[1024];
        int len;
        try {
            digest = MessageDigest.getInstance("MD5");
            bais = new ByteArrayInputStream(content.getBytes());
            while ((len = bais.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
            bais.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }

}