银联商务支付工具类

UmsPayUtil.java

package com.facepay.lovefamily.pay.utils;

/**
 * Created by faliny on 2017/8/25.
 */

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.RandomUtil;
import com.alibaba.fastjson.JSONObject;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.time.DateFormatUtils;

import javax.servlet.http.HttpServletRequest;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author msi
 */
public class UmsPayUtil {

    public static String makeSign(String md5Key, Map<String, String> params) {
        String preStr = buildSignString(params); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串
        String text = preStr + md5Key;
        return DigestUtils.sha256Hex(getContentBytes(text)).toUpperCase();
    }

    public static boolean checkSign(String md5Key, Map<String, String> params) {
        String sign = params.get("sign");

        if (StringUtils.isBlank(sign)) {
            return false;
        }

        String signV = makeSign(md5Key, params);

        return StringUtils.equalsIgnoreCase(sign, signV);
    }

    // 获取HttpServletRequest里面的参数，并decode
    public static Map<String, String> getRequestParams(HttpServletRequest request) {
        Map<String, String[]> params = request.getParameterMap();
        Map<String, String> params2 = new HashMap<>();
        for (String key : params.keySet()) {
            String[] values = params.get(key);
            if (values.length > 0) {
                params2.put(key, values[0]);
            }
        }
        return params2;
    }

    public static String genMerOrderId(String msgId) {
        String date = DateFormatUtils.format(new Date(), "yyyyMMddHHmmssSSS");
        String rand = RandomStringUtils.randomNumeric(7);
        return msgId + date + rand;
    }

    // 使json-lib来进行json到map的转换，fastjson有排序问题，不能用
    public static Map<String, String> jsonToMap(JSONObject json) {
        Map<String, String> map = new HashMap<>();
        for (Object key : json.keySet()) {
            String value = json.getString((String) key);
            map.put((String) key, value);
        }
        return map;
    }

    // 构建签名字符串
    private static String buildSignString(Map<String, String> params) {

        if (params == null || params.size() == 0) {
            return "";
        }

        List<String> keys = new ArrayList<>(params.size());

        for (String key : params.keySet()) {
            if ("sign".equals(key)) {
                continue;
            }
            if (StringUtils.isEmpty(params.get(key))) {
                continue;
            }
            keys.add(key);
        }

        Collections.sort(keys);

        StringBuilder buf = new StringBuilder();

        for (int i = 0; i < keys.size(); i++) {
            String key = keys.get(i);
            String value = params.get(key);

            if (i == keys.size() - 1) {// 拼接时，不包括最后一个&字符
                buf.append(key + "=" + value);
            } else {
                buf.append(key + "=" + value + "&");
            }
        }

        return buf.toString();
    }

    // 根据编码类型获得签名内容byte[]
    private static byte[] getContentBytes(String content) {
        try {
            return content.getBytes("UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("签名过程中出现错误");
        }
    }

    public static long yuanTofen(BigDecimal amount) {
        BigDecimal am = amount.multiply(new BigDecimal(100)).setScale(0, RoundingMode.DOWN);
        return am.longValue();
    }

    /**
     * merOrderId需要符合银商规范，以银商分配的4位系统编号作为订单号的前4位，且在商户系统中此订单号保证唯一。总长度需大于6位，小于32位。
     *
     * @param sysCode 银商分配的4位系统编号
     * @return 商户订单
     */
    public static String createMerOrderId(String sysCode) {
        return new StringBuilder(sysCode).append(DateUtil.format(LocalDateTime.now(), "yyyyMMddmmHHssSSS")).append(RandomUtil.randomNumbers(7)).toString();
    }
}