本demo基于微信扫码支付退款(扫码支付暂时没放出demo下次有时间补上)

由于只是demo很多东西没有进行封装

需注意这两个参数我使用的是out_trade_no

image.png

请求XML示例

wx2421b1c4370ec43b

10000100

6cefdb308e1e2e8aabd48cf79e546a02

1415701182

1415757673

1

1

FE56DD4AA85C0EECA82C35595A69E153

逻辑代码

public static void main(String[] args) {

try {

//构建参数

Map 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 = WXPayUtil.generateSignature(dataMap, "rv4###################");

dataMap.put("sign", sign);

//map数据转xml

String xmlString = XMLBeanUtil.map2XmlString(dataMap);

//发起退款

doRefund("137####", "https://api.mch.weixin.qq.com/secapi/pay/refund", xmlString);

} catch (Exception e) {

e.printStackTrace();

}

}

/**

*

* @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");

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();

}

}

微信签名工具类

/**

* 生成签名

* @param data 待签名数据

* @param key API密钥

* @return 签名

*/

public static String generateSignature(final Map data, String key) throws Exception {

return generateSignature(data, key, SignType.MD5);

}

/**

* 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。

* @param data 待签名数据

* @param key API密钥

* @param signType 签名方式

* @return 签名

*/

public static String generateSignature(final Map data, String key, SignType signType) throws Exception {

Set keySet = data.keySet();

String[] keyArray = keySet.toArray(new String[keySet.size()]);

Arrays.sort(keyArray);

StringBuilder sb = new StringBuilder();

for (String k : keyArray) {

if (k.equals(WXPayConstants.FIELD_SIGN)) {

continue;

}

if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名

sb.append(k).append("=").append(data.get(k).trim()).append("&");

}

sb.append("key=").append(key);

if (SignType.MD5.equals(signType)) {

return MD5(sb.toString()).toUpperCase();

}

else if (SignType.HMACSHA256.equals(signType)) {

return HMACSHA256(sb.toString(), key);

}

else {

throw new Exception(String.format("Invalid sign_type: %s", signType));

}

}

map转XML工具类

public static String map2XmlString(Map map) {

String xmlResult = "";

StringBuffer sb = new StringBuffer();

sb.append("");

for (String key : map.keySet()) {

String value = "";

sb.append("" + value + "" + key + ">");

System.out.println();

}

sb.append("");

xmlResult = sb.toString();

return xmlResult;

}