加签代码示例

package com.chuanglan.xxx.util;

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.lang3.StringUtils;

import java.security.MessageDigest;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

public class SignatureUtil {

    public static void main(String[] args) throws Exception {
        String req = "{\n" +
                "    \"nonce\": \"123456789\",\n" +
                "    \"timestamp\": \"1658974350\",\n" +
                "    \"signature\": \"f9233da1efacf7934b2d68d3f2411d55d0c9c2eb92be05c36cabe7c7b8c1d169\",\n" +
                "    \"app_id\": \"testAppId001\",\n" +
                "    \"template_id\": \"CLAIM202207260953094148600813568\",\n" +
                "    \"link_url\": \"https://www.chuanglan.com/\",\n" +
                "    \"link_type\": \"2\",\n" +
                "    \"mobiles\": \"[\\\"13333333333\\\",\\\"15555555555\\\"]\"\n" +
                "}";

        // 示例：app_id为testAppId001的app_secret的值：31ec4d8d507e510b52a5bd0793atg52a
        // 注意：上面signature的值是不参与加签的
        System.out.println("签名："+ getSignature(req,"31ec4d8d507e510b52a5bd0793atg52a"));
        // 加签后signature的值：38f9285dee3f0fe90bc4c3a5989bad6e19f7f7b7cd225a0542527466cee5f8c9
    }

    /**
     * 计算签名
     */
    public static String getSignature(String jsonString, String appSecret) throws Exception {
        TreeMap<String, String> params = JSONObject.parseObject(jsonString, TreeMap.class);
        StringBuilder sb = new StringBuilder();
        Iterator<Map.Entry<String, String>> it = params.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry<String, String> entry = it.next();
            String value = entry.getValue();
            if (StringUtils.isNotBlank(value) && !entry.getKey().equals("signature")) {
                sb.append(value);
            }
        }
        return encrypt(appSecret + sb.toString());
    }

    public static String encrypt(String str) throws Exception {
        MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
        messageDigest.update(str.getBytes("UTF-8"));
        return byte2Hex(messageDigest.digest());
    }

    private static String byte2Hex(byte[] bytes) {
        StringBuilder stringBuilder = new StringBuilder();
        String temp;
        for (byte aByte : bytes) {
            temp = Integer.toHexString(aByte & 0xFF);
            if (temp.length() == 1) {
                stringBuilder.append("0");
            }
            stringBuilder.append(temp);
        }
        return stringBuilder.toString();
    }
}