正文
微信小程序退款【证书的使用】
提示：扫一扫查出行【扫一扫了解最新限行尾号】
复制提示
1，官方文档的地址
2，在官方文档中给出了证书使用的链接，如下：
[其实只有证书的获取，选择。具体的证书怎么在代码中使用，文档中并没有给出说明]
3，第一步准备请求的参数，里面只有五个是参数是有点特殊的
（1）随机数。官方文档里面给出了说明【这里】
/**
* StringUtils工具类方法 获取一定长度的随机字符串，范围0-9，a-z
*
* @param length：指定字符串长度
* @return 一定长度的随机字符串
*/
public static String getRandomStringByLength(int length) {
String base = "abcdefghijklmnopqrstuvwxyz0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int number = random.nextInt(base.length());
sb.append(base.charAt(number));
}
return sb.toString();
}
（2）微信订单号（这个是在支付的时候产生的，需要在支付的回调函数中就将其保存在订单表中，待退款时使用）
（3）签名：这个在官方文档中也给出了说明
String mysign = PayUtil.sign(prestr, WxPayConfig.key, "utf-8").toUpperCase();
/**
* 签名字符串
*
* @param text需要签名的字符串
* @param key 密钥
* @param input_charset编码格式
* @return 签名结果
*/
public static String sign(String text, String key, String input_charset) {
text = text + "&key=" + key;
return DigestUtils.md5Hex(getContentBytes(text, input_charset));
}
public static String md5Hex(final byte[] data) {
return Hex.encodeHexString(md5(data));
}
public static String encodeHexString(final byte[] data) {
return new String(encodeHex(data));
}
public static char[] encodeHex(final byte[] data) {
return encodeHex(data, true);
}
public static char[] encodeHex(final byte[] data, final boolean toLowerCase) {
return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
}
protected static char[] encodeHex(final byte[] data, final char[] toDigits) {
final int l = data.length;
final char[] out = new char[l << 1];
// two characters form the hex value.
for (int i = 0, j = 0; i < l; i++) {
out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
out[j++] = toDigits[0x0F & data[i]];
}
return out;
}
（4）两个整形的参数（一定要注意类型【否则报参数格式错误】）
这两个参数是取得订单类的属性，在订单类中，这两个参数我是定义的Double的类型，单位：元。传的参数是以分为单位的整形，因此就需要乘100。
还有一点需要注意的是,举个例子吧:
在这里我测试的是0.01（一分）直接乘100，他的结果是1.0，这个结果是不对的，需要把后面的".0"去掉，
4，所有参数准备好之后就是发顺宏请求了，这里比较特殊的就是他需要证书，然而官方文档只给了证书的获取方式，以及不同语言的选择，并没有告诉我们怎么用。
下面就是本篇最重要的地方
public static void refund(Order order) throws Exception {
try {
KeyStore clientStore = KeyStore.getInstance("PKCS12");
// 读取本机存放的PKCS12证书文件
FileInputStream instream = new FileInputStream("****\\apiclient_cert.p12");
try {
// 指定PKCS12的密码(商户ID)
clientStore.load(instream, "***".toCharArray());
} finally {
instream.close();
}
SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(clientStore, "***".toCharArray()).build();
// 指定TLS版本
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[]{"TLSv1"}, null,
SSLConnectionSocketFactory.getDefaultHostnameVerifier());
// 设置httpclient的SSLSocketFactory
CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
try {
HttpPost httpost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund"); // 设置响应头信息
// httpost.addHeader("Connection", "keep-alive");
// httpost.addHeader("Accept", "*/*");
// httpost.addHeader("Content-Type", CONTENT_TYPE_FORM.toString());
// httpost.addHeader("X-Requested-With", "XMLHttpRequest");
// httpost.addHeader("Cache-Control", "max-age=0");
// httpost.addHeader("User-Agent", DEFAULT_USER_AGENT);
httpost.setEntity(new StringEntity(getXmlStr(order), "UTF-8"));
CloseableHttpResponse response = httpclient.execute(httpost);
try {
HttpEntity entity = response.getEntity();
String jsonStr = EntityUtils.toString(response.getEntity(), "UTF-8");
EntityUtils.consume(entity);
System.out.println(jsonStr);
} finally {
response.close();
}
} finally {
httpclient.close();
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static void refund(Order order) throws Exception {
try {
KeyStore clientStore = KeyStore.getInstance("PKCS12");
// 读取本机存放的PKCS12证书文件
FileInputStream instream = new FileInputStream("****\\apiclient_cert.p12");
try {
// 指定PKCS12的密码(商户ID)
clientStore.load(instream, "***".toCharArray());
} finally {
instream.close();
}
SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(clientStore, "***".toCharArray()).build();
// 指定TLS版本
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[]{"TLSv1"}, null,
SSLConnectionSocketFactory.getDefaultHostnameVerifier());
// 设置httpclient的SSLSocketFactory
CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
try {
HttpPost httpost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund"); // 设置响应头信息
// httpost.addHeader("Connection", "keep-alive");
// httpost.addHeader("Accept", "*/*");
// httpost.addHeader("Content-Type", CONTENT_TYPE_FORM.toString());
// httpost.addHeader("X-Requested-With", "XMLHttpRequest");
// httpost.addHeader("Cache-Control", "max-age=0");
// httpost.addHeader("User-Agent", DEFAULT_USER_AGENT);
httpost.setEntity(new StringEntity(getXmlStr(order), "UTF-8"));
CloseableHttpResponse response = httpclient.execute(httpost);
try {
HttpEntity entity = response.getEntity();
String jsonStr = EntityUtils.toString(response.getEntity(), "UTF-8");
EntityUtils.consume(entity);
System.out.println(jsonStr);
} finally {
response.close();
}
} finally {
httpclient.close();
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
测试类
public static void main(String[] args) throws Exception {
Order order = new Order();
refund(order);
}
