微信退款关于证书的使用

微信退款接口

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

证书下载 

//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

关于证书的使用

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();
		}
	}
}