官方地址 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4 具体的退款API调用接口为 https://api.mch.weixin.qq.com/secapi/pay/refund
//TODO 9.0 操作支付表，把当前的支付的状态变成 退款状态 state 1 ---> 2 //TODO 10 操作预约表，可以把当前的预约状态取消 已支付--->退款 //TODO 11 操作用户表，如果是充值退款的话，把用户的现金 - 当前退款的money //TODO 12其他等等的操作，生成记录单号之类的
将下载下来的证书放到项目中的路径,然后在发起post请求时，使用这个证书加密发送内容 比如你发送的是ABC 加密后为密文HttpClient的代码
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.6</version> </dependency>核心的代码
import java.io.File; import java.io.FileInputStream; import java.security.KeyStore; import javax.net.ssl.SSLContext; 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.conn.ssl.SSLContexts; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; /** * This example demonstrates how to create secure connections with a custom SSL * context. */ public class ClientCustomSSL { public static String SSLCERT_PATH="";//证书的路径 public static String SSLCERT_PASSWORD;//证书的密籍 @SuppressWarnings("deprecation") public static String doRefund(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"); //指向你的证书的绝对路径，带着证书去访问 FileInputStream instream = new FileInputStream(new File(SSLCERT_PATH));//P12文件目录 try { //下载证书时的密码、默认密码是你的MCHID mch_id keyStore.load(instream, SSLCERT_PASSWORD.toCharArray());//这里写密码 } finally { instream.close(); } //下载证书时的密码、默认密码是你的MCHID mch_id SSLContext sslcontext = SSLContexts.custom() .loadKeyMaterial(keyStore, SSLCERT_PASSWORD.toCharArray())//这里也是写密码的 .build(); // Allow TLSv1 protocol only SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory( sslcontext, new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER); CloseableHttpClient httpclient = HttpClients.custom() .setSSLSocketFactory(sslsf) .build(); try { HttpPost httpost = new HttpPost(url); // 设置响应头信息 httpost.addHeader("Connection", "keep-alive"); httpost.addHeader("Accept", "*/*"); httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); httpost.addHeader("Host", "api.mch.weixin.qq.com"); httpost.addHeader("X-Requested-With", "XMLHttpRequest"); httpost.addHeader("Cache-Control", "max-age=0"); httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) "); httpost.setEntity(new StringEntity(data, "UTF-8")); CloseableHttpResponse response = httpclient.execute(httpost); try { HttpEntity entity = response.getEntity(); String jsonStr = EntityUtils.toString(response.getEntity(), "UTF-8"); EntityUtils.consume(entity); return jsonStr; } finally { response.close(); } } finally { httpclient.close(); } } }
