md5加密工具类MD5

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封装md5加密工具类 MD5

public class MD5 {

    public static String getStringMD5(String value) {
        if (value == null || value.trim().length() < 1) {
            return null;
        }
        try {
            return getMD5(value.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public static String getMD5(byte[] source) {
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            return HexDump.toHex(md5.digest(source));
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public static String getStreamMD5(String filePath) {
        String hash = null;
        byte[] buffer = new byte[4096];
        BufferedInputStream in = null;
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            in = new BufferedInputStream(new FileInputStream(filePath));
            int numRead = 0;
            while ((numRead = in.read(buffer)) > 0) {
                md5.update(buffer, 0, numRead);
            }
            in.close();
            hash = HexDump.toHex(md5.digest());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        }
        return hash;
    }
}