3、API 签名

{"orderNo": "P5151145027"}

eyJvcmRlck5vIjogIlA1MTUxMTQ1MDI3In0=

String companySecret = "";
// 业务参数
JSONObject jsonObject = new JSONObject();
jsonObject.put("orderNo", "P00000001");
// 生成签名
String sign = SignUtils.buildSign(jsonObject.toJSONString(), companySecret);
System.out.println(sign);

package com.wanshifu;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

/**
 * @Description: 接口签名
 */
public class SignUtils {

    private static final char[] HEX_CHARS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    /**
     * 生成签名
     * @param busJsonData
     * @param companySecret
     * @return
     */
    public static String buildSign(String busJsonData, String companySecret) {
        String busData = Base64.getEncoder().encodeToString(busJsonData.getBytes(StandardCharsets.UTF_8));
        String sign = busData + companySecret;
                return DigestUtils.md5DigestAsHex(sign.getBytes(StandardCharsets.UTF_8)).toUpperCase();

    }

    /**
     * 数据 md5 加密
     * @param data 需要加密的数据
     * @return
     */
    private static String md5(String data) {
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            byte[] digest = md5.digest(data.getBytes(StandardCharsets.UTF_8));
            return new String(encodeHex(digest));
        } catch (NoSuchAlgorithmException ex) {
            throw new IllegalStateException("Could not find MessageDigest with algorithm MD5", ex);
        }
    }


    private static char[] encodeHex(byte[] bytes) {
        char chars[] = new char[32];
        for (int i = 0; i < chars.length; i = i + 2) {
            byte b = bytes[i / 2];
            chars[i] = HEX_CHARS[(b >>> 0x4) & 0xf];
            chars[i + 1] = HEX_CHARS[b & 0xf];
        }
        return chars;
    }
}