微信服务号开发----公众号支付退款

1、微信支付开发文档

https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_1

下载地址

http://download.csdn.net/detail/u014520797/9734108

2、微信申请退款需要双向证书，PKCS12证书 是从 https://pay.weixin.qq.com/index.php/core/home/login?return_url=%2F

微信商户平台-》账户设置-》 API安全 中下载的

下载之后存放在本地一个英文命名的文件夹下，解压。

3、证书解压之后是

4、代码

package com.kp.wxpay;

import java.util.SortedMap;
import java.util.TreeMap;




/** 
 * @author: py
 * @version:2017年1月10日 上午11:17:59 
 * @Desc  微信退款 申请以及退款
 * //api地址：http://mch.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
 */
public class WXPayRefundUtil {

	String appid = ""; //微信公众号apid
	String appsecret = " "; //微信公众号appsecret
	public static String mch_id = " ";  //微信商户id
	String op_user_id = " ";//操作员帐号, 默认为商户号
	String partnerkey = " ";//商户平台上的那个KEY
	/**
	 * @date 2017年1月10日上午10:36:50 void
	 * @Des:退款
	 */
	public void wechatRefund() {
		// 商户系统内部的退款单号，商户系统内部唯一，同一退款单号多次请求只退一笔
		String out_refund_no = " ";
		String out_trade_no = "256165";// 商户侧传给微信的订单号
		String total_fee = "1";// 总金额
		String refund_fee = "1";// 退款金额
		String nonce_str = "20bdx4b25826b";// 随机字符串
		
		SortedMap packageParams = new TreeMap();
		packageParams.put("appid", appid);
		packageParams.put("mch_id", mch_id);
		packageParams.put("nonce_str", nonce_str);
		packageParams.put("out_trade_no", out_trade_no);
		packageParams.put("out_refund_no", out_refund_no);
		packageParams.put("total_fee", total_fee);
		packageParams.put("refund_fee", refund_fee);
		packageParams.put("op_user_id", op_user_id);

		RequestHandler reqHandler = new RequestHandler(
				null, null);
		reqHandler.init(appid, appsecret, partnerkey);

		String sign = reqHandler.createSign(packageParams);
		String xml = "" + 
				 "" + appid + "" +
				 ""+ mch_id + "" + 
				 "" + nonce_str+ "" + 
				 ""+
				 "" + out_trade_no + ""+
				 "" + out_refund_no + ""+
				 "" + total_fee + ""+ 
				 "" + refund_fee + ""+
				 "" + op_user_id + "" + 
				 "";
		
		/*
		   wx2421b1c4370ec43b
		   10000100
		   6cefdb308e1e2e8aabd48cf79e546a02
		   10000100
		   1415701182
		   1415757673
		   1
		   1
		   
		   FE56DD4AA85C0EECA82C35595A69E153
		*/
		String createOrderURL = "https://api.mch.weixin.qq.com/secapi/pay/refund";
		try {
			String s= ClientCustomSSL.doRefund(createOrderURL, xml);
			System.out.println("s:"+s);
			
			//改变支付数据库中的是否退款
			//新增退款数据库数据
			
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	/**
	 * @date 2017年1月10日上午10:37:47 void
	 * @Des:退款查询
	 */
	public void querywechatRefund() {
		// 商户系统内部的退款单号，商户系统内部唯一，同一退款单号多次请求只退一笔
		String transaction_id = "656565";
		String nonce_str = "5616556165";// 随机字符串
		SortedMap packageParams = new TreeMap();
		packageParams.put("appid", appid);
		packageParams.put("mch_id", mch_id);
		packageParams.put("nonce_str", nonce_str);
		packageParams.put("transaction_id", transaction_id);
		RequestHandler reqHandler = new RequestHandler(
				null, null);
		reqHandler.init(appid, appsecret, partnerkey);
		String sign = reqHandler.createSign(packageParams);
		String xml = "" + 
				"" + appid + "" + 
				""+ mch_id + "" + 
				"" + nonce_str+ "" + 
				""+
				"" + transaction_id + ""+ 
				 "";
		
		/*
		   wx2421b1c4370ec43b
		   10000100
		   0b9f35f484df17a732e537c37708d1d0
		   
		   1415757673
		   
		   
		   66FFB727015F450D167EF38CCC549521
		*/
		
		String createOrderURL = "https://api.mch.weixin.qq.com/pay/refundquery";
		try {
			String s= ClientCustomSSL.doRefund(createOrderURL, xml);
			System.out.println("s:"+s);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	
	
	
	public static void main(String[] args) {
		WXPayRefundUtil refund=new WXPayRefundUtil();
//		refund.wechatRefund();//申请退款
		refund.querywechatRefund();//查询退款
		
		
		
	}
	
	

}

5、这个类中需要填写双向证书解压的路径

package com.kp.wxpay;

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;



public class ClientCustomSSL {

    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");
        FileInputStream instream = new FileInputStream(new File("E:/bmjcompany/wxpaycert/cert/apiclient_cert.p12"));//P12文件目录
        try {
        	/**
        	 * 此处要改
        	 * */
            keyStore.load(instream, WXPayRefundUtil.mch_id.toCharArray());//这里写密码..默认是你的MCHID
        } finally {
            instream.close();
        }

        // Trust own CA and all self-signed certs
        /**
    	 * 此处要改
    	 * */
        SSLContext sslcontext = SSLContexts.custom()
                .loadKeyMaterial(keyStore, WXPayRefundUtil.mch_id.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();
        }
    }

}

其他代码可下载查看

6、源码地址

http://download.csdn.net/detail/u014520797/9734118