SpringBoot 微信退款功能的示例代码

一：微信支付证书配置

二：证书读取以及读取后的使用

package com.zhx.guides.assistant.config.wechatpay;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.springframework.core.io.ClassPathResource;

import javax.net.ssl.SSLContext;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyStore;

/**
 * @Class WeChatConfigUtil
 * @Version 1.0
 * @Date 创建时间：2020-06-15 16:19
 * @Copyright Copyright by
 * @Direction 类说明
 */
public class WeChatConfigUtil {

  private static byte[] certData;

  /****
   * @throws Exception
   */
  static {
    try {
      //从微信商户平台下载的安全证书存放的目录
      //String certPath = "D:\\config\\apiclient_cert.p12";
      //File file = new File(certPath);
      //InputStream certStream = new FileInputStream(file);
      //使用springboot配置文件内读取的方式
      ClassPathResource classPathResource = new ClassPathResource("\\user_key\\apiclient_cert.p12");
      InputStream certStream = classPathResource.getInputStream();
      WeChatConfigUtil.certData = IOUtils.toByteArray(certStream);
      certStream.read(WeChatConfigUtil.certData);
      certStream.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  /**
   * 开始退款操作
   *
   * @param mchId 商户ID
   * @param url  请求URL
   * @param data 退款参数
   * @return
   * @throws Exception
   */
  public static String doRefund(String mchId, String url, String data) throws Exception {
    /**
     * 注意PKCS12证书 是从微信商户平台-》账户设置-》 API安全 中下载的
     */
    KeyStore keyStore = KeyStore.getInstance("PKCS12");
    //这里自行实现我是使用数据库配置将证书上传到了服务器可以使用 FileInputStream读取本地文件
    //ByteArrayInputStream inputStream = FileUtil.getInputStream("https://############################.p12");
    ByteArrayInputStream inputStream = new ByteArrayInputStream(WeChatConfigUtil.certData);
    try {
      //这里写密码..默认是你的MCHID
      keyStore.load(inputStream, mchId.toCharArray());
    } finally {
      inputStream.close();
    }
    SSLContext sslcontext = SSLContexts.custom()
        //这里也是写密码的
        .loadKeyMaterial(keyStore, mchId.toCharArray())
        .build();
    SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
        sslcontext,
        SSLConnectionSocketFactory.getDefaultHostnameVerifier());
    CloseableHttpClient httpclient = HttpClients.custom()
        .setSSLSocketFactory(sslsf)
        .build();
    try {
      HttpPost httpost = new HttpPost(url);
      httpost.setEntity(new StringEntity(data, "UTF-8"));
      CloseableHttpResponse response = httpclient.execute(httpost);
      try {
        HttpEntity entity = response.getEntity();
        //接受到返回信息
        String jsonStr = EntityUtils.toString(response.getEntity(), "UTF-8");
        EntityUtils.consume(entity);
        return jsonStr;
      } finally {
        response.close();
      }
    } finally {
      httpclient.close();
    }
  }

}

三：发起订单退款操作

/**
 * 封装查询请求数据
 * @param tradeRefund 	退款订单请求信息
 * @param path				数据访问PATH
 * @return
 */
private static SortedMap<String, Object> refundData( TradeRefund tradeRefund , String path ) throws Exception {
	//构建参数
	Map<String, String> dataMap = new HashMap<>();
	dataMap.put("appid","wx#################");
	dataMap.put("mch_id","137#############");
	//自行实现该随机串
	dataMap.put("nonce_str",Core.MD5("12344"));
	dataMap.put("out_trade_no","P190808170038402889c5318502");
	dataMap.put("out_refund_no","P190808170038402889c5318502");
	dataMap.put("total_fee","1");
	dataMap.put("refund_fee","1");
	dataMap.put("refund_desc","退款");
	//生成签名
	String sign = PayToolUtil.createSign("UTF-8", dataMap , WeichatPayConfigure.API_KEY );
	//WXPayUtil.generateSignature(dataMap, "rv4###################");
	dataMap.put("sign", sign);
	//map数据转xml
	String requestXML = getRequestXml( dataMap );
	logger.info( "订单退款请求参数：\n" + requestXML );
	//发起退款
	String responseXml = WeChatConfigUtil.doRefund( WeichatPayConfigure.MCH_ID , "https://api.mch.weixin.qq.com/secapi/pay/refund", requestXML );
}

/**
 * @author
 * @date 2016-4-22
 * @Description：将请求参数转换为xml格式的string
 * @param parameters
 *      请求参数
 * @return
 */
public static String getRequestXml(SortedMap<Object, Object> parameters) {
	StringBuffer sb = new StringBuffer();
	sb.append("<xml>");
	Set es = parameters.entrySet();
	Iterator it = es.iterator();
	while (it.hasNext()) {
		Map.Entry entry = (Map.Entry) it.next();
		String k = (String) entry.getKey();
		String v = (String) entry.getValue();
		if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
			sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
		} else {
			sb.append("<" + k + ">" + v + "</" + k + ">");
		}
	}
	sb.append("</xml>");
	return sb.toString();
}

/**
 * @author
 * @date 2016-4-22
 * @Description：sign签名
 * @param characterEncoding
 *      编码格式
 * @param packageParams
 *      请求参数
 * @return
 */
public static String createSign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
	StringBuffer sb = new StringBuffer();
	Set es = packageParams.entrySet();
	Iterator it = es.iterator();
	while (it.hasNext()) {
		Map.Entry entry = (Map.Entry) it.next();
		String k = (String) entry.getKey();
		String v = (String) entry.getValue();
		if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
			sb.append(k + "=" + v + "&");
		}
	}
	sb.append("key=" + API_KEY);
	String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
	return sign;
} 

package com.zhx.guides.assistant.interfaces.pay.wechatpay.util;

import java.security.MessageDigest;

public class MD5Util {

  private static String byteArrayToHexString(byte b[]) {
    StringBuffer resultSb = new StringBuffer();
    for (int i = 0; i < b.length; i++)
      resultSb.append(byteToHexString(b[i])); 

    return resultSb.toString();
  } 

  private static String byteToHexString(byte b) {
    int n = b;
    if (n < 0)
      n += 256;
    int d1 = n / 16;
    int d2 = n % 16;
    return hexDigits[d1] + hexDigits[d2];
  } 

  public static String MD5Encode(String origin, String charsetname) {
    String resultString = null;
    try {
      resultString = new String(origin);
      MessageDigest md = MessageDigest.getInstance("MD5");
      if (charsetname == null || "".equals(charsetname))
        resultString = byteArrayToHexString(md.digest(resultString
            .getBytes()));
      else
        resultString = byteArrayToHexString(md.digest(resultString
            .getBytes(charsetname)));
    } catch (Exception exception) {
    }
    return resultString;
  } 

  /***
   * 简化版本
   * @param s
   * @return
   */
  public final static String MD5(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
		try {
			byte[] btInput = s.getBytes("utf-8");
			// 获得MD5摘要算法的 MessageDigest 对象
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			// 使用指定的字节更新摘要
			mdInst.update(btInput);
			// 获得密文
			byte[] md = mdInst.digest();
			// 把密文转换成十六进制的字符串形式
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

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

}

/**
 * @author
 * @date 2016-4-22
 * @Description：将请求参数转换为xml格式的string
 * @param parameters
 *      请求参数
 * @return
 */
public static String getRequestXml(SortedMap<Object, Object> parameters) {
	StringBuffer sb = new StringBuffer();
	sb.append("<xml>");
	Set es = parameters.entrySet();
	Iterator it = es.iterator();
	while (it.hasNext()) {
		Map.Entry entry = (Map.Entry) it.next();
		String k = (String) entry.getKey();
		String v = (String) entry.getValue();
		if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
			sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
		} else {
			sb.append("<" + k + ">" + v + "</" + k + ">");
		}
	}
	sb.append("</xml>");
	return sb.toString();
} 

四：请求XML示例

<xml>
  <appid>wx2421b1c4370ec43b</appid>
  <mch_id>10000100</mch_id>
  <nonce_str>6cefdb308e1e2e8aabd48cf79e546a02</nonce_str>
  <out_refund_no>1415701182</out_refund_no>
  <out_trade_no>1415757673</out_trade_no>
  <refund_fee>1</refund_fee>
  <total_fee>1</total_fee>
  <transaction_id></transaction_id>
  <sign>FE56DD4AA85C0EECA82C35595A69E153</sign>
</xml>

五：官方信息

官方地址：https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=9_4

需注意这两个参数我使用的是out_trade_no

总结

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