微信支付（提现）

api：

https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay.php?chapter=14_2

需要用到的工具类：（xml和map相互转换）

package com.st.project.common;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.*;

/**
 * xml和map之间转换的工具类
 */
public class XmlUtil {
    /**
     * 将Map转换为XML格式的字符串
     *
     * @param data Map类型数据
     * @return XML格式的字符串
     * @throws Exception
     */
    public static String mapToXml(Map data) throws Exception {
        // TODO 在这里更换
        Document document = WXPayXmlUtil.newDocument();
        Element root = document.createElement("xml");
        document.appendChild(root);
        for (String key: data.keySet()) {
            String value = data.get(key);
            if (value == null) {
                value = "";
            }
            value = value.trim();
            org.w3c.dom.Element filed = document.createElement(key);
            filed.appendChild(document.createTextNode(value));
            root.appendChild(filed);
        }
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        DOMSource source = new DOMSource(document);
        transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        transformer.setOutputProperty(OutputKeys.INDENT, "yes");
        StringWriter writer = new StringWriter();
        StreamResult result = new StreamResult(writer);
        transformer.transform(source, result);
        String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
        try {
            writer.close();
        }
        catch (Exception ex) {
        }
        return output;
    }


    /*
     * 将SortedMap 集合转化成 xml格式
     */
    public static String getRequestXml(SortedMap parameters){
        StringBuffer sb = new StringBuffer();
        sb.append("");
        Set es = parameters.entrySet();
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            String v = (String)entry.getValue();
            if ("attach".equalsIgnoreCase(k)||"body".equalsIgnoreCase(k)||"sign".equalsIgnoreCase(k)) {
                sb.append("<"+k+">"+"");
            }else {
                sb.append("<"+k+">"+v+"");
            }
        }
        sb.append("");
        return sb.toString();
    }

    /**
     * XML格式字符串转换为Map
     *
     * @param strXML XML字符串
     * @return XML数据转换后的Map
     * @throws Exception
     */
    public static Map xmlToMap(String strXML) throws Exception {
        try {
            Map data = new HashMap();
            // TODO 在这里更换
            DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder();
            InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
            org.w3c.dom.Document doc = documentBuilder.parse(stream);
            doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getDocumentElement().getChildNodes();
            for (int idx = 0; idx < nodeList.getLength(); ++idx) {
                Node node = nodeList.item(idx);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    org.w3c.dom.Element element = (org.w3c.dom.Element) node;
                    data.put(element.getNodeName(), element.getTextContent());
                }
            }
            try {
                stream.close();
            } catch (Exception ex) {
                // do nothing
            }
            return data;
        } catch (Exception ex) {
//            WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
            throw ex;
        }

    }

}

/**
 * XML解析工具类 官方SDK给出(主要是这个来阻止XXE)
 */
final class WXPayXmlUtil {
    public static DocumentBuilder newDocumentBuilder() throws ParserConfigurationException {
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        documentBuilderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
        documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
        documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
        documentBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
        documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
        documentBuilderFactory.setXIncludeAware(false);
        documentBuilderFactory.setExpandEntityReferences(false);

        return documentBuilderFactory.newDocumentBuilder();
    }

    public static Document newDocument() throws ParserConfigurationException {
        return newDocumentBuilder().newDocument();
    }
}

实现付款工具类：

package com.st.project.common;

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.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

import javax.net.ssl.SSLContext;
import java.io.File;
import java.io.FileInputStream;
import java.security.KeyStore;
import java.util.*;

import static com.st.project.common.MD5Utils.MD5Encode;
import static com.st.project.common.XmlUtil.getRequestXml;
import static com.st.project.common.XmlUtil.xmlToMap;

/**
 * 微信支付
 */
@Component
public class WechatpayUtil {

//    @Autowired
//    private Environment env;

//    @Value("${wx.url}")
//    private String transfers_url;     //接口链接
//    @Value("${wx.appId}")
//    private String appid;  //微信公众号的appid
//    @Value("${wx.mch_id}")
//    private String mch_id; //商户号
//    @Value("${wx.private_key}")
//    private String private_key; //商户平台设置的密钥key
//    @Value("${wx.sslcert_path}")
//    private String sslcert_path; //指向你的证书的绝对路径，带着证书去访问
//    @Value("${portals.domain}")
//    private String spbill_create_ip; //ip地址：该IP同在商户平台设置的IP白名单中的IP没有关联，该IP可传用户端或者服务端的IP

    /**
     * 微信支付
     * @param nonce_str 生成随机数，保证安全性
     * @param partner_trade_no 生成商户订单号
     * @param openid 支付给用户openid
     * @param check_name 是否验证真实姓名;NO_CHECK不校验真实姓名;FORCE_CHECK强校验真实姓名
     * @param re_user_name 收款用户姓名;如果check_name设置为FORCE_CHECK，则必填用户真实姓名
     * @param amount 企业付款金额，单位为分
     * @param desc 企业付款操作说明信息,必填。
     * @return
     */
    public Map balance_out_alipay(String nonce_str,String partner_trade_no,String openid,String check_name,String re_user_name,String amount,String desc,Environment env){
        Map resultMap=new HashMap();
        //请求示例
        //
        //wxe062425f740c30d8
        //10000098
        //3PG2J4ILTKCH16CQ2502SI8ZNMTM67VS
        //100000982014120919616
        //ohO4Gt7wVPxIT1A9GjFaMYMiZY1s
        //FORCE_CHECK
        //张三
        //100
        //节日快乐!
        //10.2.3.10
        //C97BDBACF37622775366F38B629F45E3
        //

        //1.0 拼凑企业支付需要的参数

        //2.0 生成map集合
        SortedMap packageParams = new TreeMap();
        packageParams.put("mch_appid", env.getProperty("wx.appId"));         //微信公众号的appid
        packageParams.put("mchid", env.getProperty("wx.mch_id"));            //商户号
        packageParams.put("nonce_str",nonce_str);      //随机生成后数字，保证安全性;不长于32位
        packageParams.put("partner_trade_no",partner_trade_no); //商户订单号;需保持唯一性(只能是字母或者数字，不能包含有其他字符)
        packageParams.put("openid",openid);            //支付给用户openid
        packageParams.put("check_name",check_name);    //是否验证真实姓名呢;NO_CHECK不校验真实姓名;FORCE_CHECK强校验真实姓名
//        packageParams.put("re_user_name",re_user_name);//收款用户姓名;如果check_name设置为FORCE_CHECK，则必填用户真实姓名
        packageParams.put("amount",amount);            //企业付款金额，单位为分
        packageParams.put("desc",desc);    			   //企业付款操作说明信息，必填。
        packageParams.put("spbill_create_ip",env.getProperty("portals.ip")); //调用接口的机器Ip地址
//        packageParams.put("spbill_create_ip","192.168.1.11"); //调用接口的机器Ip地址
        //3.0 生成自己的签名
        String sign  = createSign("utf-8",packageParams,env);
        //4.0 封装退款对象
        packageParams.put("sign", sign);
        //5.0将当前的map结合转化成xml格式
        String reuqestXml = getRequestXml(packageParams);
        System.out.println(reuqestXml);
        //6.0获取需要发送的url地址
//        String wxUrl = env.getProperty("wx.transfers_url"); //获取退款的api接口

        try {
            String weixinPost = doRefund(env.getProperty("wx.transfers_url"),reuqestXml,env);
            System.out.println(weixinPost);
            //7.0 解析返回的xml数据
            Map refundResult = xmlToMap(weixinPost);
            if("SUCCESS".equalsIgnoreCase(refundResult.get("result_code")) && "SUCCESS".equalsIgnoreCase(refundResult.get("return_code"))){
                //成功示例
                //
                //
                //
                //
                //
                //
                //
                //
                //
                //
                //
                //

                //8表示退款成功
                //TODO 执行成功付款后的业务逻辑
                resultMap.put("success", "true");
                resultMap.put("payment_no", refundResult.get("payment_no"));//企业付款成功，返回的微信付款单号
                resultMap.put("msg", "转账成功");

            }else{
                //错误示例
                //
                //
                //
                //
                //
                //
                //

                //9 表示退款失败
                //TODO 调用service的方法 ，存储失败提现的记录咯
                resultMap.put("success", "false");
                resultMap.put("msg", refundResult.get("return_code")+refundResult.get("return_msg"));//返回信息，如非空，为错误原因;签名失败;参数格式校验错误

            }

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return resultMap;
    }

    /**
     * 根据微信签名算法生成自己的签名sign
     * @param characterEncoding 编码格式 eg：utf-8
     * @param parameters 用于生成sign的参数集合（SortedMap：保证按照键的升序排列的映射）
     * @return
     */
    public String createSign(String characterEncoding,SortedMap parameters,Environment env){
        StringBuffer sb = new StringBuffer();
        StringBuffer sbkey = new StringBuffer();
        Set es = parameters.entrySet();  //将集合M内非空参数值的参数按照参数名ASCII码从小到大排序（字典序）
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            Object v = entry.getValue();
            //空值不传递，不参与签名组串
            if(null != v && !"".equals(v)) {
                //使用URL键值对的格式（即key1=value1&key2=value2…）拼接成字符串stringA
                sb.append(k + "=" + v + "&");
                sbkey.append(k + "=" + v + "&");
            }
        }

        sbkey=sbkey.append("key="+env.getProperty("wx.private_key"));//注：key为商户平台设置的密钥key
        String sign=MD5Encode(sbkey.toString(),characterEncoding).toUpperCase(); //注：MD5签名方式

        return sign;
    }


    /**
     * Post请求+证书
     * @param url
     * @param data
     * @return
     * @throws Exception
     */
    @SuppressWarnings("deprecation")
    public String doRefund(String url,String data,Environment env) 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");
        /**
         *此处要改
         *wxconfig.SSLCERT_PATH : 指向你的证书的绝对路径，带着证书去访问
         */
        FileInputStream instream = new FileInputStream(new File(env.getProperty("wx.sslcert_path")));//P12文件目录
        try {
            /**
             * 此处要改
             *
             * 下载证书时的密码、默认密码是你的MCHID mch_id
             * */
            keyStore.load(instream, env.getProperty("wx.mch_id").toCharArray());//这里写密码
        } finally {
            instream.close();
        }

        // Trust own CA and all self-signed certs
        /**
         * 此处要改
         * 下载证书时的密码、默认密码是你的MCHID mch_id
         * */
        SSLContext sslcontext = SSLContexts.custom()
                .loadKeyMaterial(keyStore, env.getProperty("wx.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();
        }
    }

   /**
     * MD5加密
     * @param origin
     * @param characterEncoding 编码格式 eg：utf-8
     * @return
     */
    public  String MD5Encode(String origin,String characterEncoding) {
        String result = null;
        try {
            result = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            result = byteArrayToHexString(md.digest(result.getBytes(characterEncoding)));
        } catch (Exception exception) {
        }
        return result;
    }


}

传入参数实现付款：

            //微信
            WechatpayUtil wechatpayUtil = new WechatpayUtil();
            String nonce_str = getUUID();  //生成随机数，保证安全性
            String partner_trade_no = getUUID(); //生成商户订单号
            String openid = customerEntity.getOpenId();       //支付给用户openid
            String check_name = "NO_CHECK";   //是否验证真实姓名;NO_CHECK不校验真实姓名;FORCE_CHECK强校验真实姓名
            String re_user_name = ""; //收款用户姓名;如果check_name设置为FORCE_CHECK，则必填用户真实姓名
            String amount = (int) ((Double.parseDouble(blance) + Double.parseDouble(blance_distribution)) * 100) + "";   //企业付款金额，单位为分
            String desc = "用户余额申请提现到钱包";     //企业付款操作说明信息,必填
            Map wechatPayMap = wechatpayUtil.balance_out_alipay(nonce_str, partner_trade_no, openid, check_name, re_user_name, amount, desc, env);
            if ("true".equals(wechatPayMap.get("success"))) {
                orderRefunds.setCode(partner_trade_no);
                orderRefunds.setTradeNo(wechatPayMap.get("payment_no"));
                orderRefunds.setStatus(1);
                orderRefundsRepository.save(orderRefunds);
                //用户减去相应的余额或分销余额
                customerEntity.setBalance(customerEntity.getBalance().subtract(BigDecimal.valueOf(Double.parseDouble(blance))));
                customerEntity.setBalanceDistribut(customerEntity.getBalanceDistribut().subtract(BigDecimal.valueOf(Double.parseDouble(blance_distribution))));
                customerRepository.saveAndFlush(customerEntity);

                map.put("success", "true");
                map.put("msg", "微信提现成功");
            } else {
                orderRefunds.setCode(partner_trade_no);
                orderRefunds.setStatus(2);
                orderRefundsRepository.save(orderRefunds);
                map.put("success", "false");
                map.put("msg", "微信提现失败:" + wechatPayMap.get("msg"));
            }