httputil

package com.uuzu.newbasys.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Map;

import javax.xml.bind.DatatypeConverter;

/**
 * HttpUtilN
 */
public class HttpUtilN {

    /**
     * 获取时间戳
     */
    public static String getTimestamp() {

        return DateUtil8.getTimestamp();
    }

    public static String getQueryString(Map<String, Object> params) {

        String result = params.entrySet().stream().map(entry -> entry.getKey() + "=" + entry.getValue())
                .reduce((s1, s2) -> s1 + "&" + s2).orElse("");
        return result;
    }

    /**
     * 生成签名
     */
    public static String generateSign(String str, String key) {

        String hash = null;
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update((str + key).getBytes());
            byte[] digest = md.digest();
            hash = DatatypeConverter.printHexBinary(digest).toLowerCase();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return hash;
    }
}