java微信公众号支付示例详解

本文实例为大家分享了java微信公众号支付示例代码，供大家参考，具体内容如下

开始之前，先准备好：appid、商家号、商户密匙。

工具类：

MD5Util.java

package com.yiexpress.core.utils.wechat;

import java.security.MessageDigest;

/**
 * MD5工具类
 */
public class MD5Util {
  public final static String MD5(String s) {
    char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

    try {
      byte[] btInput = s.getBytes();

      MessageDigest mdInst = MessageDigest.getInstance("MD5");

      mdInst.update(btInput);

      byte[] md = mdInst.digest();

      int j = md.length;
      char str[] = new char[j * 2];
      int k = 0;
      for (int i = 0; i < j; i++) {
        byte byte0 = md[i];
        str[k++] = hexDigits[byte0 >>> 4 & 0xf];
        str[k++] = hexDigits[byte0 & 0xf];
      }
      String md5Str = new String(str);
      return md5Str;
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
  }
}

SapUtils.java

package com.yiexpress.core.utils;
import java.lang.reflect.*;
import java.util.List;
import java.io.IOException;
import java.io.StringWriter;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

public class SapUtils {
  private static final Logger logger = LoggerFactory.getLogger(SapUtils.class);
  /** 根据反射对javabean转成xml文件的格式
   * 以类名为第一标签，所有属性作为第二节点，并放入对应的值，如果属性为空 就不放入该熟悉
   * @param dto 传入的对象
   * @param operationName 操作名称
   * @return
   */
  public static String formatToXml(Object dto,String operationName){
    logger.info("解析当前类{}为指定的xml文档格式的数据",dto.getClass().getName());
    logger.info("当前的同步方法是,{}",operationName);
    String result = null;
    Field fields[]=dto.getClass().getDeclaredFields();//dto 是实体类名称
    //DocumentHelper提供了创建Document对象的方法
    Document document = DocumentHelper.createDocument();

    //添加节点信息
     String className=dto.getClass().getName();
     // 操作的名称
    Element rootElement = document.addElement(operationName);
    try {
      Field.setAccessible(fields, true);
      for (int i = 0; i < fields.length; i++) {
        //添加节点信息
        if(!StringUtils.isEmpty(fields[i].get(dto))){
          Class<?> type = fields[i].getType();
          // 如果是list
          if(type == List.class){
            String listName = fields[i].getName();
            createElement(rootElement, fields[i].get(dto),listName);
          }
          else{
            Element element = rootElement.addElement(fields[i].getName());
            element.setText((String) fields[i].get(dto));
          }
        }
      }
      // 设置XML文档格式
      OutputFormat outputFormat = OutputFormat.createPrettyPrint();
      // 设置XML编码方式,即是用指定的编码方式保存XML文档到字符串(String),这里也可以指定为GBK或是ISO8859-1
      outputFormat.setEncoding("UTF-8");
      // outputFormat.setSuppressDeclaration(true); //是否生产xml头
      outputFormat.setIndent(true); //设置是否缩进
      outputFormat.setIndent("  "); //以四个空格方式实现缩进
      outputFormat.setNewlines(true); //设置是否换行
      StringWriter stringWriter =null;
      // Writer fileWriter =null;
      // xmlWriter是用来把XML文档写入字符串的(工具)
      XMLWriter xmlWriter = null;
      try {
          // stringWriter字符串是用来保存XML文档的
        stringWriter = new StringWriter();
        // fileWriter = new FileWriter("D:\\modu11le.xml");
        // xmlWriter是用来把XML文档写入字符串的(工具)
        xmlWriter = new XMLWriter(stringWriter, outputFormat);
        // 把创建好的XML文档写入字符串
        xmlWriter.write(document);
        //fileWriter.write(stringWriter.toString());
        result=stringWriter.toString();
      } catch (IOException e) {
        logger.error("写入数据失败");
        throw new RuntimeException("写入数据失败"+e);
      }finally{
         try {
           if(xmlWriter!=null){
             xmlWriter.flush();
             xmlWriter.close();
           }
/*           if(fileWriter!=null){
             fileWriter.flush();
             fileWriter.close();
           }*/

        } catch (IOException e) {
          logger.error("关闭输出流出错");
          throw new RuntimeException("关闭输出流出错"+e);
        }
      }
    } catch (Exception e) {
      logger.error("添加xml的节点失败"+e);
    }
    logger.error("转换xml结束");
    return result;
  }

  /**
   * 添加类中的list
   * @param element
   * @param object
   * @param name
   * @return
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   */
  public static Element createElement(Element element ,Object object,String name ) throws IllegalArgumentException, IllegalAccessException{
    Element nameElement = element.addElement(name);
    List info = (List)object;
    for(int j= 0;j<info.size();j++){
      // 添加row的标签
      Element rowElement = nameElement.addElement("row");
      // 添加 对象的熟悉
      Field fields[]=info.get(j).getClass().getDeclaredFields();//dto 是实体类名称
      Field.setAccessible(fields, true);
      for (int i = 0; i < fields.length; i++) {
        //添加节点信息
        if(!StringUtils.isEmpty(fields[i].get(info.get(j)))){
            Element childElement = rowElement.addElement(fields[i].getName());
            childElement.setText((String) fields[i].get(info.get(j)));
        }
      }
    }
    return element;
  }
}

UnifiedOrderRequest.java

package com.yiexpress.core.utils.wechat;

public class UnifiedOrderRequest {
  private String appid;// 公众账号ID
  private String mch_id;//商户号
  private String device_info; //设备号  否
  private String nonce_str;//随机字符串
  private String sign;//签名
  private String sign_type;//签名类型
  private String body;//商品描述
  private String detail;//商品详情
  private String attach;//附加数据
  private String out_trade_no;//商户订单号
  private String fee_type;//标价币种
  private String total_fee;//标价金额
  private String spbill_create_ip;//终端IP
  private String time_start;//交易起始时间
  private String time_expire;//交易结束时间
  private String goods_tag;//订单优惠标记
  private String notify_url;//通知地址
  private String trade_type;//交易类型
  private String product_id;//商品ID
  private String limit_pay;//指定支付方式
  private String openid;//用户标识
  public String getAppid() {
    return appid;
  }
  public void setAppid(String appid) {
    this.appid = appid;
  }
  public String getMch_id() {
    return mch_id;
  }
  public void setMch_id(String mch_id) {
    this.mch_id = mch_id;
  }
  public String getDevice_info() {
    return device_info;
  }
  public void setDevice_info(String device_info) {
    this.device_info = device_info;
  }
  public String getNonce_str() {
    return nonce_str;
  }
  public void setNonce_str(String nonce_str) {
    this.nonce_str = nonce_str;
  }
  public String getSign() {
    return sign;
  }
  public void setSign(String sign) {
    this.sign = sign;
  }
  public String getSign_type() {
    return sign_type;
  }
  public void setSign_type(String sign_type) {
    this.sign_type = sign_type;
  }
  public String getBody() {
    return body;
  }
  public void setBody(String body) {
    this.body = body;
  }
  public String getDetail() {
    return detail;
  }
  public void setDetail(String detail) {
    this.detail = detail;
  }
  public String getAttach() {
    return attach;
  }
  public void setAttach(String attach) {
    this.attach = attach;
  }
  public String getOut_trade_no() {
    return out_trade_no;
  }
  public void setOut_trade_no(String out_trade_no) {
    this.out_trade_no = out_trade_no;
  }
  public String getFee_type() {
    return fee_type;
  }
  public void setFee_type(String fee_type) {
    this.fee_type = fee_type;
  }
  public String getTotal_fee() {
    return total_fee;
  }
  public void setTotal_fee(String total_fee) {
    this.total_fee = total_fee;
  }
  public String getSpbill_create_ip() {
    return spbill_create_ip;
  }
  public void setSpbill_create_ip(String spbill_create_ip) {
    this.spbill_create_ip = spbill_create_ip;
  }
  public String getTime_start() {
    return time_start;
  }
  public void setTime_start(String time_start) {
    this.time_start = time_start;
  }
  public String getTime_expire() {
    return time_expire;
  }
  public void setTime_expire(String time_expire) {
    this.time_expire = time_expire;
  }
  public String getGoods_tag() {
    return goods_tag;
  }
  public void setGoods_tag(String goods_tag) {
    this.goods_tag = goods_tag;
  }
  public String getNotify_url() {
    return notify_url;
  }
  public void setNotify_url(String notify_url) {
    this.notify_url = notify_url;
  }
  public String getTrade_type() {
    return trade_type;
  }
  public void setTrade_type(String trade_type) {
    this.trade_type = trade_type;
  }
  public String getProduct_id() {
    return product_id;
  }
  public void setProduct_id(String product_id) {
    this.product_id = product_id;
  }
  public String getLimit_pay() {
    return limit_pay;
  }
  public void setLimit_pay(String limit_pay) {
    this.limit_pay = limit_pay;
  }
  public String getOpenid() {
    return openid;
  }
  public void setOpenid(String openid) {
    this.openid = openid;
  }

}

UnifiedOrderRespose.java

package com.yiexpress.core.utils.wechat;

public class UnifiedOrderRespose {
  private String return_code;       //返回状态码
  private String return_msg;       //返回信息
  private String appid;          //公众账号ID
  private String mch_id;         //商户号
  private String device_info;       //设备号
  private String nonce_str;        //随机字符串
  private String sign;          //签名
  private String result_code;       //业务结果
  private String err_code;        //错误代码
  private String err_code_des;      //错误代码描述
  private String trade_type;       //交易类型
  private String prepay_id;        //预支付交易会话标识
  private String code_url;        //二维码链接
  public String getReturn_code() {
    return return_code;
  }
  public void setReturn_code(String return_code) {
    this.return_code = return_code;
  }
  public String getReturn_msg() {
    return return_msg;
  }
  public void setReturn_msg(String return_msg) {
    this.return_msg = return_msg;
  }
  public String getAppid() {
    return appid;
  }
  public void setAppid(String appid) {
    this.appid = appid;
  }
  public String getMch_id() {
    return mch_id;
  }
  public void setMch_id(String mch_id) {
    this.mch_id = mch_id;
  }
  public String getDevice_info() {
    return device_info;
  }
  public void setDevice_info(String device_info) {
    this.device_info = device_info;
  }
  public String getNonce_str() {
    return nonce_str;
  }
  public void setNonce_str(String nonce_str) {
    this.nonce_str = nonce_str;
  }
  public String getSign() {
    return sign;
  }
  public void setSign(String sign) {
    this.sign = sign;
  }
  public String getResult_code() {
    return result_code;
  }
  public void setResult_code(String result_code) {
    this.result_code = result_code;
  }
  public String getErr_code() {
    return err_code;
  }
  public void setErr_code(String err_code) {
    this.err_code = err_code;
  }
  public String getErr_code_des() {
    return err_code_des;
  }
  public void setErr_code_des(String err_code_des) {
    this.err_code_des = err_code_des;
  }
  public String getTrade_type() {
    return trade_type;
  }
  public void setTrade_type(String trade_type) {
    this.trade_type = trade_type;
  }
  public String getPrepay_id() {
    return prepay_id;
  }
  public void setPrepay_id(String prepay_id) {
    this.prepay_id = prepay_id;
  }
  public String getCode_url() {
    return code_url;
  }
  public void setCode_url(String code_url) {
    this.code_url = code_url;
  }
}

WXPayConstants.java

package com.yiexpress.core.utils.wechat;

public class WXPayConstants {
   public enum SignType {
    MD5, HMACSHA256
  }
  public static final String FAIL   = "FAIL";
  public static final String SUCCESS = "SUCCESS";
  public static final String HMACSHA256 = "HMAC-SHA256";
  public static final String MD5 = "MD5";
  public static final String FIELD_SIGN = "sign";
  public static final String FIELD_SIGN_TYPE = "sign_type";
}

WXPayUtil.java

package com.yiexpress.core.utils.wechat;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.*;
import java.security.MessageDigest; 

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

import com.yiexpress.core.utils.SapUtils;
import com.yiexpress.core.utils.XmlUtil;

import com.yiexpress.core.utils.wechat.WXPayConstants.SignType;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
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 org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory; 

/**
 * 支付工具类
 */
public class WXPayUtil {
  private static Logger log = LoggerFactory.getLogger(WXPayUtil.class); 

  /**
   * 生成订单对象信息
   * @param orderId 订单号
   * @param appId 微信appId
   * @param mch_id 微信分配的商户ID
   * @param body 支付介绍主体
   * @param price 支付价格（放大100倍）
   * @param spbill_create_ip 终端IP
   * @param notify_url 异步直接结果通知接口地址
   * @param noncestr
   * @return
   */
  public static Map<String,Object> createOrderInfo(Map<String, String> requestMap,String shopKey) {
    //生成订单对象
    UnifiedOrderRequest unifiedOrderRequest = new UnifiedOrderRequest();
    unifiedOrderRequest.setAppid(requestMap.get("appId"));//公众账号ID
    unifiedOrderRequest.setBody(requestMap.get("body"));//商品描述
    unifiedOrderRequest.setMch_id(requestMap.get("mch_id"));//商户号
    unifiedOrderRequest.setNonce_str(requestMap.get("noncestr"));//随机字符串
    unifiedOrderRequest.setNotify_url(requestMap.get("notify_url"));//通知地址
    unifiedOrderRequest.setOpenid(requestMap.get("userWeixinOpenId"));
    unifiedOrderRequest.setDetail(requestMap.get("detail"));//详情
    unifiedOrderRequest.setOut_trade_no(requestMap.get("out_trade_no"));//商户订单号
    unifiedOrderRequest.setSpbill_create_ip(requestMap.get("spbill_create_ip"));//终端IP
    unifiedOrderRequest.setTotal_fee(requestMap.get("payMoney")); //金额需要扩大100倍:1代表支付时是0.01
    unifiedOrderRequest.setTrade_type("JSAPI");//JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付
    SortedMap<String, String> packageParams = new TreeMap<String, String>();
    packageParams.put("appid", unifiedOrderRequest.getAppid());
    packageParams.put("body", unifiedOrderRequest.getBody());
    packageParams.put("mch_id", unifiedOrderRequest.getMch_id());
    packageParams.put("nonce_str", unifiedOrderRequest.getNonce_str());
    packageParams.put("notify_url", unifiedOrderRequest.getNotify_url());
    packageParams.put("openid", unifiedOrderRequest.getOpenid());
    packageParams.put("detail", unifiedOrderRequest.getDetail());
    packageParams.put("out_trade_no", unifiedOrderRequest.getOut_trade_no());
    packageParams.put("spbill_create_ip", unifiedOrderRequest.getSpbill_create_ip());
    packageParams.put("total_fee", unifiedOrderRequest.getTotal_fee());
    packageParams.put("trade_type", unifiedOrderRequest.getTrade_type());

    try {
      unifiedOrderRequest.setSign(generateSignature(packageParams,shopKey));//签名
    } catch (Exception e) {
      e.printStackTrace();
    }
    //将订单对象转为xml格式
    String orderstr=SapUtils.formatToXml(unifiedOrderRequest,"xml").replace("<?xml version=\"1.0\" encoding=\"UTF-8\"?>","");
    log.debug("封装好的统一下单请求数据："+orderstr.replace("__", "_"));
    Map<String,Object> responseMap = new HashMap<String,Object>();
    responseMap.put("orderInfo_toString", orderstr.replace("__", "_"));
    responseMap.put("unifiedOrderRequest",unifiedOrderRequest);
    return responseMap;
  }  

  public static void main(String[] args) {
//     UnifiedOrderRequest ut=new UnifiedOrderRequest();
//     ut.setAppid("wx1234156789");
//     ut.setBody("内容body");
//     ut.setMch_id("商户号");
//     ut.setNonce_str("随机字符串");
//     ut.setNotify_url("回调地址");
//     ut.setOpenid("openid");
//     ut.setDetail("详情");
//     ut.setOut_trade_no("订单号");
//     ut.setSpbill_create_ip("终端IP");
//     ut.setTotal_fee("金额");
//     ut.setTrade_type("调用类型JSAPI");
//     System.out.println("---"+SapUtils.formatToXml(ut,"xml")+"---");
//     UnifiedOrderRequest unifiedOrderRequest = new UnifiedOrderRequest();
//     unifiedOrderRequest.setAppid("dsfsdf");//公众账号ID
//     unifiedOrderRequest.setBody("sdfsdf");//商品描述
//     unifiedOrderRequest.setMch_id("sdfsd");//商户号
//     unifiedOrderRequest.setNonce_str("dfsd");//随机字符串
//     unifiedOrderRequest.setNotify_url("sdfdsf");//通知地址
//     unifiedOrderRequest.setOpenid("sdfsdf");
//
//     unifiedOrderRequest.setTrade_type("JSAPI");//JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付
//
//     System.out.println("---"+SapUtils.formatToXml(unifiedOrderRequest,"xml").replace("<?xml version=\"1.0\" encoding=\"UTF-8\"?>","")+"---");
//     String str="<xml><appid>dsfsdf</appid><mch_id>sdfsd</mch_id><nonce_str>dfsd</nonce_str><body>sdfsdf</body><notify_url>sdfdsf</notify_url><trade_type>JSAPI</trade_type><openid>sdfsdf</openid></xml>";
//     UnifiedOrderRequest s=SapUtils.getBeanByxml(str,UnifiedOrderRequest.class);
//     System.out.println(s.getAppid()+"---"+s.getMch_id()+"--"+s.getFee_type());

  }

  /**
   * 生成签名
   * @param appid_value
   * @param mch_id_value
   * @param productId
   * @param nonce_str_value
   * @param trade_type
   * @param notify_url
   * @param spbill_create_ip
   * @param total_fee
   * @param out_trade_no
   * @return
   */
  private static String createSign(UnifiedOrderRequest unifiedOrderRequest,String shopKey) {
    //根据规则创建可排序的map集合
    SortedMap<String, String> packageParams = new TreeMap<String, String>();
    packageParams.put("appid", unifiedOrderRequest.getAppid());
    packageParams.put("body", unifiedOrderRequest.getBody());
    packageParams.put("mch_id", unifiedOrderRequest.getMch_id());
    packageParams.put("nonce_str", unifiedOrderRequest.getNonce_str());
    packageParams.put("notify_url", unifiedOrderRequest.getNotify_url());
    packageParams.put("out_trade_no", unifiedOrderRequest.getOut_trade_no());
    packageParams.put("spbill_create_ip", unifiedOrderRequest.getSpbill_create_ip());
    packageParams.put("trade_type", unifiedOrderRequest.getTrade_type());
    packageParams.put("total_fee", unifiedOrderRequest.getTotal_fee());
    StringBuffer sb = new StringBuffer();
    Set es = packageParams.entrySet();//字典序
    Iterator it = es.iterator();
    while (it.hasNext()) {
      Map.Entry entry = (Map.Entry) it.next();
      String k = (String) entry.getKey();
      String v = (String) entry.getValue();
      //为空不参与签名、参数名区分大小写
      if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
        sb.append(k + "=" + v + "&");
      }
    }
    //第二步拼接key，key设置路径：微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置
    sb.append("key="+shopKey);
    String sign = MD5Util.MD5(sb.toString()).toUpperCase();//MD5加密
    log.error("方式一生成的签名="+sign);
    return sign;
  }  

  //xml解析
  public static SortedMap<String, String> doXMLParseWithSorted(String strxml) throws Exception {
     strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
     if(null == strxml || "".equals(strxml)) {
       return null;
     }
     SortedMap<String,String> m = new TreeMap<String,String>();
     InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
     SAXBuilder builder = new SAXBuilder();
     Document doc = builder.build(in);
     Element root = doc.getRootElement();
     List list = root.getChildren();
     Iterator it = list.iterator();
     while(it.hasNext()) {
       Element e = (Element) it.next();
       String k = e.getName();
       String v = "";
       List children = e.getChildren();
       if(children.isEmpty()) {
         v = e.getTextNormalize();
       } else {
         v = getChildrenText(children);
       }
       m.put(k, v);
     }
     //关闭流
     in.close();
     return m;
  }   

  public static String getChildrenText(List children) {
    StringBuffer sb = new StringBuffer();
    if(!children.isEmpty()) {
      Iterator it = children.iterator();
      while(it.hasNext()) {
        Element e = (Element) it.next();
        String name = e.getName();
        String value = e.getTextNormalize();
        List list = e.getChildren();
        sb.append("<" + name + ">");
        if(!list.isEmpty()) {
          sb.append(getChildrenText(list));
        }
        sb.append(value);
        sb.append("</" + name + ">");
      }
    }
    return sb.toString();
  }
  /**
   * 调统一下单API
   * @param orderInfo
   * @return
   */
  public static UnifiedOrderRespose httpOrder(String orderInfo,int index) {
    //统一下单接口地址 自动适应 1中国境内 2东南亚  3其他
    String[] urlList={"https://api.mch.weixin.qq.com/pay/unifiedorder","https://apihk.mch.weixin.qq.com/pay/unifiedorder"
        ,"https://apius.mch.weixin.qq.com/pay/unifiedorder "};
    //String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    try {
      HttpURLConnection conn = (HttpURLConnection) new URL(urlList[index]).openConnection();
      //加入数据
      conn.setRequestMethod("POST");
      conn.setDoOutput(true);
      BufferedOutputStream buffOutStr = new BufferedOutputStream(conn.getOutputStream());
      buffOutStr.write(orderInfo.getBytes("UTF-8"));
      buffOutStr.flush();
      buffOutStr.close();
      //获取输入流
      BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
      String line = null;
      StringBuffer sb = new StringBuffer();
      while((line = reader.readLine())!= null){
        sb.append(line);
      }
      //xml转对象
      UnifiedOrderRespose unifiedOrderRespose =XmlUtil.getBeanByxml(sb.toString(),UnifiedOrderRespose.class);
      return unifiedOrderRespose;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }

  /**
   * 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<String, String> xmlToMap(String strXML) throws Exception {
    try {
      Map<String, String> data = new HashMap<String, String>();
      DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder documentBuilder = documentBuilderFactory.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;
    } 

  } 

  /**
   * 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<String, String> data) throws Exception {
    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
    org.w3c.dom.Document document = documentBuilder.newDocument();
    org.w3c.dom.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;
  } 

  /**
   * 生成带有 sign 的 XML 格式字符串
   *
   * @param data Map类型数据
   * @param key API密钥
   * @return 含有sign字段的XML
   */
  public static String generateSignedXml(final Map<String, String> data, String key) throws Exception {
    return generateSignedXml(data, key, SignType.MD5);
  } 

  /**
   * 生成带有 sign 的 XML 格式字符串
   *
   * @param data Map类型数据
   * @param key API密钥
   * @param signType 签名类型
   * @return 含有sign字段的XML
   */
  public static String generateSignedXml(final Map<String, String> data, String key, SignType signType) throws Exception {
    String sign = generateSignature(data, key, signType);
    data.put(WXPayConstants.FIELD_SIGN, sign);
    return mapToXml(data);
  } 

  /**
   * 判断签名是否正确
   *
   * @param xmlStr XML格式数据
   * @param key API密钥
   * @return 签名是否正确
   * @throws Exception
   */
  public static boolean isSignatureValid(String xmlStr, String key) throws Exception {
    Map<String, String> data = xmlToMap(xmlStr);
    if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
      return false;
    }
    String sign = data.get(WXPayConstants.FIELD_SIGN);
    return generateSignature(data, key).equals(sign);
  } 

  /**
   * 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。
   *
   * @param data Map类型数据
   * @param key API密钥
   * @return 签名是否正确
   * @throws Exception
   */
  public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception {
    return isSignatureValid(data, key, SignType.MD5);
  } 

  /**
   * 判断签名是否正确，必须包含sign字段，否则返回false。
   *
   * @param data Map类型数据
   * @param key API密钥
   * @param signType 签名方式
   * @return 签名是否正确
   * @throws Exception
   */
  public static boolean isSignatureValid(Map<String, String> data, String key, SignType signType) throws Exception {
    if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
      return false;
    }
    String sign = data.get(WXPayConstants.FIELD_SIGN);
    return generateSignature(data, key, signType).equals(sign);
  } 

  /**
   * 生成签名
   *
   * @param data 待签名数据
   * @param key API密钥
   * @return 签名
   */
  public static String generateSignature(final Map<String, String> data, String key) throws Exception {
    return generateSignature(data, key, SignType.MD5);
  } 

  /**
   * 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。
   *
   * @param data 待签名数据
   * @param key API密钥
   * @param signType 签名方式
   * @return 签名
   */
  public static String generateSignature(final Map<String, String> data, String key, SignType signType) throws Exception {
    Set<String> keySet = data.keySet();
    String[] keyArray = keySet.toArray(new String[keySet.size()]);
    Arrays.sort(keyArray);
    StringBuilder sb = new StringBuilder();
    for (String k : keyArray) {
      if (k.equals(WXPayConstants.FIELD_SIGN)) {
        continue;
      }
      if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
        sb.append(k).append("=").append(data.get(k).trim()).append("&");
    }
    sb.append("key=").append(key);
    if (SignType.MD5.equals(signType)) {
      return MD5(sb.toString()).toUpperCase();
    }
    else if (SignType.HMACSHA256.equals(signType)) {
      return HMACSHA256(sb.toString(), key);
    }
    else {
      log.error("获取签名失败，失败原因："+String.format("Invalid sign_type: %s", signType));
      throw new Exception(String.format("Invalid sign_type: %s", signType));
    }
  } 

  /**
   * 获取随机字符串 Nonce Str
   * @return String 随机字符串
   */
  public static String generateNonceStr() {
    return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
  }
  /**
   * Map转xml数据
   */
  public static String GetMapToXML(Map<String,String> param){
    StringBuffer sb = new StringBuffer();
    sb.append("<xml>");
    for (Map.Entry<String,String> entry : param.entrySet()) {
      sb.append("<"+ entry.getKey() +">");
      sb.append(entry.getValue());
      sb.append("</"+ entry.getKey() +">");
    }
    sb.append("</xml>");
    return sb.toString();
  }  

  /**
   * 生成 MD5
   * @param data 待处理数据
   * @return MD5结果
   */
  public static String MD5(String data) throws Exception {
    java.security.MessageDigest md = MessageDigest.getInstance("MD5");
    byte[] array = md.digest(data.getBytes("UTF-8"));
    StringBuilder sb = new StringBuilder();
    for (byte item : array) {
      sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
    }
    return sb.toString().toUpperCase();
  } 

  /**
   * 生成 HMACSHA256
   * @param data 待处理数据
   * @param key 密钥
   * @return 加密结果
   * @throws Exception
   */
  public static String HMACSHA256(String data, String key) throws Exception {
    Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
    SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
    sha256_HMAC.init(secret_key);
    byte[] array = sha256_HMAC.doFinal(data.getBytes("UTF-8"));
    StringBuilder sb = new StringBuilder();
    for (byte item : array) {
      sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
    }
    return sb.toString().toUpperCase();
  } 

  /**
   * 日志
   * @return
   */
  public static Logger getLogger() {
    Logger logger = LoggerFactory.getLogger("wxpay java sdk");
    return logger;
  } 

  /**
   * 获取当前时间戳，单位秒
   * @return
   */
  public static long getCurrentTimestamp() {
    return System.currentTimeMillis()/1000;
  } 

  /**
   * 获取当前时间戳，单位毫秒
   * @return
   */
  public static long getCurrentTimestampMs() {
    return System.currentTimeMillis();
  } 

  /**
   * 生成 uuid， 即用来标识一笔单，也用做 nonce_str
   * @return
   */
  public static String generateUUID() {
    return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
  } 

  /**
   * 支付签名
   * @param timestamp
   * @param noncestr
   * @param packages
   * @return
   * @throws UnsupportedEncodingException
   */
  public static String paySign(String timestamp, String noncestr,String packages,String appId){
    Map<String, String> paras = new HashMap<String, String>();
    paras.put("appid", appId);
    paras.put("timestamp", timestamp);
    paras.put("noncestr", noncestr);
    paras.put("package", packages);
    paras.put("signType", "MD5");
    StringBuffer sb = new StringBuffer();
    Set es = paras.entrySet();//字典序
    Iterator it = es.iterator();
    while (it.hasNext()) {
      Map.Entry entry = (Map.Entry) it.next();
      String k = (String) entry.getKey();
      String v = (String) entry.getValue();
      //为空不参与签名、参数名区分大小写
      if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
        sb.append(k + "=" + v + "&");
      }
    }
    String sign = MD5Util.MD5(sb.toString()).toUpperCase();//MD5加密
    return sign;
  }
}

XmlUtil.java

package com.yiexpress.core.utils;
import java.io.StringReader;
import java.lang.reflect.Field;
import java.util.Date;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.xml.sax.InputSource;

public class XmlUtil{
  /**
   * json 数据转换对象
   *
   * @param Element
   *      要转换的Element数据
   * @param pojo
   *      要转换的目标对象类型
   * @return 转换的目标对象
   * @throws Exception
   *       转换失败
   */
  @SuppressWarnings("rawtypes")
  public static Object fromXmlToBean(Element rootElt, Class pojo) throws Exception{
    // 首先得到pojo所定义的字段
    Field[] fields = pojo.getDeclaredFields();
    // 根据传入的Class动态生成pojo对象
    Object obj = pojo.newInstance();
    for (Field field : fields)
    {
      // 设置字段可访问（必须，否则报错）
      field.setAccessible(true);
      // 得到字段的属性名
      String name = field.getName();
      // 这一段的作用是如果字段在Element中不存在会抛出异常，如果出异常，则跳过。
      try
      {
        rootElt.elementTextTrim(name);
      }
      catch (Exception ex)
      {
        continue;
      }
      if (rootElt.elementTextTrim(name) != null && !"".equals(rootElt.elementTextTrim(name)))
      {
        // 根据字段的类型将值转化为相应的类型，并设置到生成的对象中。
        if (field.getType().equals(Long.class) || field.getType().equals(long.class))
        {
          field.set(obj, Long.parseLong(rootElt.elementTextTrim(name)));
        }
        else if (field.getType().equals(String.class))
        {
          field.set(obj, rootElt.elementTextTrim(name));
        }
        else if (field.getType().equals(Double.class) || field.getType().equals(double.class))
        {
          field.set(obj, Double.parseDouble(rootElt.elementTextTrim(name)));
        }
        else if (field.getType().equals(Integer.class) || field.getType().equals(int.class))
        {
          field.set(obj, Integer.parseInt(rootElt.elementTextTrim(name)));
        }
        else if (field.getType().equals(java.util.Date.class))
        {
          field.set(obj, Date.parse(rootElt.elementTextTrim(name)));
        }
        else
        {
          continue;
        }
      }
    }
    return obj;
  }

  /**
   * 把xml格式转化为指定对象
   *
   * @param xml
   * @return
   */
  @SuppressWarnings("unchecked")
  public static <T> T getBeanByxml(String xml, Class<T> valueType) {
    T person = null;
    InputSource in = new InputSource(new StringReader(xml));
    in.setEncoding("UTF-8");
    SAXReader reader = new SAXReader();
    Document document;
    try {
      document = reader.read(in);
      Element root = document.getRootElement();
      person = (T) XmlUtil.fromXmlToBean(root, valueType);

    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      System.out.println("数据解析错误");

    }
    return person;
  }
}

获取预支付ID和签名的controller

package com.yiexpress.jerry.controller.ewe.wechat;

import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.yiexpress.core.utils.wechat.UnifiedOrderRequest;
import com.yiexpress.core.utils.wechat.UnifiedOrderRespose;
import com.yiexpress.core.utils.wechat.WXPayUtil;

/**
 * 微信支付controller
 */
@Controller
@RequestMapping(value = "/wxpay")
public class WXPayController{
  private static final Logger LOGGER = LoggerFactory.getLogger(WXPayController.class);

  private String appId="公总号 appid";//公总号 appid
  private String mchId="商家号";//商家号
  private String apiKey="商户密匙";//商户密匙

  /**
   * 获取终端IP
   * @param request
   * @return
   */
  public static String getIpAddr(HttpServletRequest request) {
    String ip = request.getHeader( " x-forwarded-for " );
    if (ip == null || ip.length() == 0 || " unknown " .equalsIgnoreCase(ip)) {
      ip = request.getHeader( " Proxy-Client-IP " );
    }
    if (ip == null || ip.length() == 0 || " unknown " .equalsIgnoreCase(ip)) {
      ip = request.getHeader( " WL-Proxy-Client-IP " );
    }
    if (ip == null || ip.length() == 0 || " unknown " .equalsIgnoreCase(ip)) {
      ip = request.getRemoteAddr();
    }
    return ip;
   }  

  /**
   * 支付初始化  返回预支付ID、签名等信息
   * @param payMoney
   * @return map
   * result -1
   */
  @RequestMapping("/toPayInit")
  @ResponseBody
  public Map<String,Object> toPay(HttpServletRequest request,@RequestParam(value="payMoney",required=true)float payMoney,@RequestParam(value="openId",required=true) String openId,@RequestParam(value="orderId",required=true)String orderId){
    Map<String,Object> map = new HashMap<>();
    //订单号 目前生产的随机数 后面放入指定系统唯一的单号
    //判断单号是否存在
    String noncestr = WXPayUtil.generateNonceStr();
    Map<String,String> requestMap = new HashMap<String, String>();
    requestMap.put("appId",appId);
    requestMap.put("userWeixinOpenId",openId);
    //之前使用ETCA单号作为商户订单号，现在改为自动生成的账单号  2018-10-25 Peter
    //requestMap.put("out_trade_no",auShipmentBrief.getShipmentReference());
    requestMap.put("out_trade_no","订单号");
    requestMap.put("mch_id",mchId);
    //计算金额  微信支付的金额的单位是分，例如：实际支付1.23元，传入参数就是123
    int money=0;
    try {
      money=(int)(payMoney*100);
    } catch (Exception e) {
      map.put("result",-1);
      map.put("msg","金额格式不正确");
      return map;
    }

    requestMap.put("payMoney",money+"");
    requestMap.put("spbill_create_ip", getIpAddr(request));
    requestMap.put("notify_url","回调地址");
    requestMap.put("noncestr", noncestr);
    requestMap.put("body","微信下单账单支付");
    requestMap.put("detail","散客下单账单支付");
    Map<String,Object> requestInfo = WXPayUtil.createOrderInfo(requestMap,apiKey);
    String orderInfo_toString = (String) requestInfo.get("orderInfo_toString");
    LOGGER.debug("request 请求字符串:"+orderInfo_toString);
     //判断返回码
    UnifiedOrderRespose orderResponse = WXPayUtil.httpOrder(orderInfo_toString,0);// 调用统一下单接口
    //判断超时的情况
    if(orderResponse==null || orderResponse.getReturn_code()==null || ("SUCCESS".equals(orderResponse.getReturn_code()) && (orderResponse.getErr_code()==null || "SYSTEMERROR".equals(orderResponse.getErr_code())))){
      orderResponse = WXPayUtil.httpOrder(orderInfo_toString,1);
      if(orderResponse==null || orderResponse.getReturn_code()==null || ("SUCCESS".equals(orderResponse.getReturn_code()) && (orderResponse.getErr_code()==null || "SYSTEMERROR".equals(orderResponse.getErr_code())))){
        orderResponse = WXPayUtil.httpOrder(orderInfo_toString,2);
      }
    }

    LOGGER.debug("response 返回字段:==》{}",orderResponse);
    //根据微信文档return_code 和result_code都为SUCCESS的时候才会返回code_url
    if(null!=orderResponse && "SUCCESS".equals(orderResponse.getReturn_code()) && "SUCCESS".equals(orderResponse.getResult_code())){
      String timestamp = String.valueOf(WXPayUtil.getCurrentTimestamp());
      map.put("timestamp",timestamp);
      map.put("noncestr",noncestr);
      UnifiedOrderRequest unifiedOrderRequest = (UnifiedOrderRequest) requestInfo.get("unifiedOrderRequest");
      map.put("unifiedOrderRequest",unifiedOrderRequest);
      SortedMap<String, String> packageParams = new TreeMap<String, String>();
      packageParams.put("appId",appId);
      packageParams.put("signType","MD5");
      packageParams.put("nonceStr", noncestr);
      packageParams.put("timeStamp", timestamp);
      String packages = "prepay_id="+orderResponse.getPrepay_id();
      packageParams.put("package",packages); 

      String sign = null;
      try {
        //生成签名
        sign = WXPayUtil.generateSignature(packageParams,apiKey);
      } catch (Exception e) {
        map.put("result",-1);
        map.put("msg","支付签名信息异常");
        e.printStackTrace();
      }
      if(sign!=null && !"".equals(sign)){ 

        LOGGER.debug("------------支付签名："+sign+"-------------------");
        map.put("paySign",sign);
        map.put("result",1);
        map.put("appId",appId);
      }else{
        map.put("result",-1);
        map.put("msg","支付签名信息异常");
      } 

      map.put("prepay_id",orderResponse.getPrepay_id());
      return map;
    }else{ //不成功
      if(orderResponse!=null){
        String text = "调用微信支付出错，返回状态码："+orderResponse.getReturn_code()+"，返回信息："+orderResponse.getReturn_msg();
        if(orderResponse.getErr_code()!=null && !"".equals(orderResponse.getErr_code())){
          text = text +"，错误码："+orderResponse.getErr_code()+"，错误描述："+orderResponse.getErr_code_des();
        }
        LOGGER.error(text);
      }else{
        LOGGER.error("返回值  orderResponse对象为空");
      }
      map.put("result",-1);
      map.put("msg","支付环境异常,请稍后再试");
      return map;
    }
  } 

}

jsp代码

<script type="text/javascript">

//点击支付按钮 开始支付
function toPay(){

  //初步判断数据
  var openId=$("#openId").val();
  var payMoney=$("#payMoney").val();
  $.ajax({
    url : "${pageContext.request.contextPath}/toPayInit",
    type:"POST",
    dataType : 'json',
    data:{
      payMoney:payMoney,
      openId:openId,
      orderId:"订单号"
    },
    success : function(result) {
      if(result.result==1){
        var paySign = result.paySign;
        var prepay_id = result.prepay_id;
        var nonceStr = result.noncestr;
        var timestamp = result.timestamp;
        var unifiedOrderRequest = result.unifiedOrderRequest;
        var spbill_create_ip = unifiedOrderRequest.spbill_create_ip;
        var detail = unifiedOrderRequest.detail;
        var out_trade_no = unifiedOrderRequest.out_trade_no;
        var appId=result.appId;
        onBridgeReady(paySign,prepay_id,nonceStr,timestamp,appId);
      }else{
        alert("失败");
      }
    },
    error : function(data, status, e) { // 服务器响应失败时的处理函数
      alert("数据异常,支付失败", 'error');
    }
  });
}

//调起公众号支付
function onBridgeReady(paySign,prepay_id,nonceStr,timestamp,appId){
  WeixinJSBridge.invoke(
    'getBrandWCPayRequest', {
      "appId":appId,   //appid
      "timeStamp":timestamp,
      "nonceStr":nonceStr, //随机串
      "package":"prepay_id="+prepay_id,
      "signType":"MD5",
      "paySign":paySign //微信签名
    },
    function(res){
      // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回  ok，但并不保证它绝对可靠。
      if(res.err_msg == "get_brand_wcpay_request:ok" ) {
        alert("支付完成", 'success');
      }else if(res.err_msg == "get_brand_wcpay_request:cancel" ) {
        alert("取消支付", 'success');

      }else if(res.err_msg == "get_brand_wcpay_request:fail"){
        alert("支付失败", 'success');

      }
    }
  );
}
</script>

定义微信支付成功回调接口APIAupostController.java

package com.yiexpress.api.controller.ewe.aupost;

import java.util.HashMap;
import java.util.Map;

import javax.annotation.Resource;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.collections.MapUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.yiexpress.core.utils.wechat.WXPayUtil;
@Controller
@RequestMapping("/api")
public class APIAupostController {

  private static final Logger LOGGER=LoggerFactory.getLogger(APIAupostController.class);

   @Resource(name = "jacksonBean")
   private MappingJackson2HttpMessageConverter jackson;
   private String apiKey="商户密匙";//商户密匙

   /**
     * 异步回调接口
     * @param request
     * @param response
     * @throws Exception
     */
     @RequestMapping(value="/paymentNotice",produces="text/html;charset=utf-8")
     @ResponseBody
     public String WeixinParentNotifyPage(HttpServletRequest request,HttpServletResponse response) throws Exception{
       ServletInputStream instream = request.getInputStream();
       StringBuffer sb = new StringBuffer();
       int len = -1;
       byte[] buffer = new byte[1024];
       while((len = instream.read(buffer)) != -1){
         sb.append(new String(buffer,0,len));
       }
       instream.close();
       Map<String,String> map = WXPayUtil.xmlToMap(sb.toString());//接受微信的回调的通知参数
       Map<String,String> return_data = new HashMap<String,String>();
       //判断签名是否正确
       if(WXPayUtil.isSignatureValid(map,apiKey)){
         if(map.get("return_code").toString().equals("FAIL")){
           return_data.put("return_code", "FAIL");
           return_data.put("return_msg", map.get("return_msg"));
         }else {
           String return_code=MapUtils.getString(map,"return_code");
           String result_code=MapUtils.getString(map,"result_code");
           if(return_code!=null && "SUCCESS".equals(return_code) && result_code!=null && "SUCCESS".equals(result_code)){
             String out_trade_no =MapUtils.getString(map,"out_trade_no");//系统订单号
             //支付成功,可以自定义新逻辑

           }
         }
       }else{
         return_data.put("return_code", "FAIL");
         return_data.put("return_msg", "签名错误");
       }
       String xml = WXPayUtil.GetMapToXML(return_data);
       LOGGER.error("支付通知回调结果："+xml);
      return xml;
     }

}

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