小程序退款（JAVA）

一、步骤

1、获取用户标识openid等步骤请查询我博客——微信小程序支付（JAVA）;

2、申请退款

3、退款回调

二、代码展示

1、小程序代码：

 //退款
  refund: function (openId) {
    var that = this;
    wx.request({
      url: 'http://t7hhri.natappfree.cc/wechat/refund',
      header: {
        'content-type': 'application/x-www-form-urlencoded'
      },
      method: 'POST',
      data: {
        'openid': openId,
        'orderId': '036b2f8a56904804b3eb1da907735bc1',
        'deposit': '1'
      },
      success: function (res) {
        console.log('refund:' + JSON.stringify(res.data));
      }
    })

  }

2、后台代码

 @RequestMapping(value = "/refund")
    @ResponseBody
    public Object refund(HttpServletRequest request) throws Exception {
        JsonResult jsonResult = new JsonResult();
        String code = MessageUtil.CODE_SUCCESS;//状态码
        String msg = MessageUtil.MSG_00;//提示信息
        PageData pd = new PageData();
        try {
            pd = this.getPageData();
            if (!pd.containsKey("orderId") || StringUtils.isEmpty(pd.getString("orderId"))){
                code = MessageUtil.CODE_ERROR;
                msg = MessageUtil.MSG_NULL;
            }else {
//                int isCanCancel = diveService.cancelOrder(pd);
                int isCanCancel = 1;
                if(isCanCancel == 1){
                    String nonce_str = getRandomStringByLength(32);
                    String orderId = pd.getString("orderId");
                    PageData data = new PageData();
                    data.put("appid", Configure.getAppID());
                    data.put("mch_id", Configure.getMch_id());
                    data.put("nonce_str", nonce_str);
                    data.put("sign_type","MD5");
                    data.put("out_trade_no", orderId);//商户订单号
                    data.put("out_refund_no", UuidUtil.get32UUID());//商户订单号
                    data.put("total_fee", "1");//支付金额，这边需要转成字符串类型，否则后面的签名会失败
                    data.put("refund_fee", "1");
                    data.put("notify_url", Configure.getNotify_url_refund());//退改成功后的回调地址
                    String prestr = PayUtil.createLinkString(data); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串
                    //MD5运算生成签名，这里是第一次签名，用于调用统一下单接口
                    String mysign = PayUtil.sign(prestr, Configure.getKey(), "utf-8").toUpperCase();
                    data.put("sign", mysign);
                    String result = CertHttpUtil.postData(Configure.getRefundPath(),PayUtil.GetMapToXML(data));
                    System.out.println(result);
                    Map rep = PayUtil.doXMLParse(result);
                    System.out.println(rep);
                }
            }
            jsonResult.setCode(code);
            jsonResult.setMessage(msg);
        }catch (Exception e) {
            jsonResult.setCode(MessageUtil.CODE_ERROR);
            jsonResult.setMessage(MessageUtil.MSG_01);
            logger.error(e.toString(), e);
        }
        return  jsonResult;
    }

package com.fh.wx;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyStore;

import javax.net.ssl.SSLContext;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.config.RequestConfig;
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;
/**
 * Created by 菜园子 on 2018/7/4.
 */
public class CertHttpUtil {
    private static int socketTimeout = 10000;// 连接超时时间，默认10秒
    private static int connectTimeout = 30000;// 传输超时时间，默认30秒
    private static RequestConfig requestConfig;// 请求器的配置
    private static CloseableHttpClient httpClient;// HTTP请求器

    /**
     * 通过Https往API post xml数据
     * @param url  API地址
     * @param xmlObj   要提交的XML数据对象
     * @return
     */
    public static String postData(String url, String xmlObj) {
        // 加载证书
        try {
            initCert();
        } catch (Exception e) {
            e.printStackTrace();
        }
        String result = null;
        HttpPost httpPost = new HttpPost(url);
        // 得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别
        StringEntity postEntity = new StringEntity(xmlObj, "UTF-8");
        httpPost.addHeader("Content-Type", "text/xml");
        httpPost.setEntity(postEntity);
        // 根据默认超时限制初始化requestConfig
        requestConfig = RequestConfig.custom()
                .setSocketTimeout(socketTimeout)
                .setConnectTimeout(connectTimeout)
                .build();
        // 设置请求器的配置
        httpPost.setConfig(requestConfig);
        try {
            HttpResponse response = null;
            try {
                response = httpClient.execute(httpPost);
            }  catch (IOException e) {
                e.printStackTrace();
            }
            HttpEntity entity = response.getEntity();
            try {
                result = EntityUtils.toString(entity, "UTF-8");
            }  catch (IOException e) {
                e.printStackTrace();
            }
        } finally {
            httpPost.abort();
        }
        return result;
    }

    /**
     * 加载证书
     *
     */
    private static void initCert() throws Exception {
        // 证书密码，默认为商户ID
        String key = Configure.getMch_id();
        // 证书的路径
        String path = Configure.getCertPath();
        // 指定读取证书格式为PKCS12
        KeyStore keyStore = KeyStore.getInstance("PKCS12");
        // 读取本机存放的PKCS12证书文件
        FileInputStream instream = new FileInputStream(new File(path));
        try {
            // 指定PKCS12的密码(商户ID)
            keyStore.load(instream, key.toCharArray());
        } finally {
            instream.close();
        }
        SSLContext sslcontext = SSLContexts
                .custom()
                .loadKeyMaterial(keyStore, key.toCharArray())
                .build();
        // 指定TLS版本
        SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                sslcontext, new String[] { "TLSv1" }, null,
                SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
        // 设置httpclient的SSLSocketFactory
        httpClient = HttpClients
                .custom()
                .setSSLSocketFactory(sslsf)
                .build();
    }
}

3、退款回调

/*退款回调*/
@RequestMapping(value = "/refundResult")
@ResponseBody
public void refundResult(HttpServletRequest request, HttpServletResponse response) throws Exception {
    String reqParams = StreamUtil.read(request.getInputStream());
    Map result = PayUtil.doXMLParse(reqParams);
    String return_code = (String) result.get("return_code");//返回状态码
    if (return_code.equals("SUCCESS")) {
        
       
    }
    StringBuffer sb = new StringBuffer("");
    response.getWriter().write(sb.toString());
}

注意：找不到的工具类请找我的上一篇博——微信小程序支付（JAVA）