Java实现微信公众号和扫码支付的案例

互联网 17-5-16

微信支付已经成为生活中必不可少的付款方式，本篇文章主要介绍了Java微信支付之公众号支付、扫码支付，有需要的小伙伴可以了解一下。

微信支付现在已经变得越来越流行了，随之也出现了很多以可以快速接入微信支付为噱头的产品，不过方便之余也使得我们做东西慢慢依赖第三方，丧失了独立思考的能力，这次打算分享下我之前开发过的微信支付。

一、H5公众号支付

要点：正确获取openId以及统一下单接口，正确处理支付结果通知，正确配置支付授权目录

H5的支付方式是使用较为广泛的方式，这种支付方式主要用于微信内自定义菜单的网页，依赖手机上安装的微信客户端，高版本的微信才支持微信支付，下面按我的流程注意说明

1 编写用于支付的页面，由于是测试用就写的简单了点

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>   <%   String path = request.getContextPath();   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";   %>      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">   <html>    <head>    <base href="<%=basePath%>">        <title>微信支付样例</title>        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->       </head>       <body>    <form action="oauthServlet" method="POST">       订单号：<input type="text" name="orderNo" />     <input type="submit" value="H5支付"/>    </form>    </br></br>     <form action="scanCodePayServlet?flag=createCode" method="POST">       订单号：<input type="text" name="orderNo" />     <input type="submit" value="扫码支付"/>    </form>    </body>   </html>

2 编写一个servlet用于通过Oauth获取code

package com.debug.weixin.servlet;      import java.io.IOException;   import java.io.PrintWriter;      import javax.servlet.RequestDispatcher;   import javax.servlet.ServletException;   import javax.servlet.http.HttpServlet;   import javax.servlet.http.HttpServletRequest;   import javax.servlet.http.HttpServletResponse;      import com.debug.weixin.util.CommonUtil;   import com.debug.weixin.util.ServerConfig;   public class OauthServlet extends HttpServlet {       public void doGet(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {        this.doPost(request, response);    }       public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {         String orderNo=request.getParameter("orderNo");      //调用微信Oauth2.0获取openid      String redirectURL=ServerConfig.SERVERDOMAIN+"/BasicWeixin/payServletForH5?orderNo="+orderNo;      String redirectURI="";      try {       redirectURI=CommonUtil.initOpenId(redirectURL);      } catch (Exception e) {      // TODO Auto-generated catch block      e.printStackTrace();      }      //System.out.println(redirectURI);      //RequestDispatcher dis= request.getRequestDispatcher(redirectURI);      //dis.forward(request, response);      response.sendRedirect(redirectURI);    }   }

3 获取到code后，通过REDIRECTURI获取openId,调用统一下单接口

package com.debug.weixin.servlet;      import java.io.IOException;   import java.io.PrintWriter;   import java.util.SortedMap;   import java.util.TreeMap;      import javax.servlet.RequestDispatcher;   import javax.servlet.ServletException;   import javax.servlet.http.HttpServlet;   import javax.servlet.http.HttpServletRequest;   import javax.servlet.http.HttpServletResponse;      import com.debug.weixin.pojo.WeixinOauth2Token;   import com.debug.weixin.pojo.WeixinQRCode;   import com.debug.weixin.util.AdvancedUtil;   import com.debug.weixin.util.CommonUtil;   import com.debug.weixin.util.ConfigUtil;   import com.debug.weixin.util.PayCommonUtil;      public class PayServletForH5 extends HttpServlet {           public void doGet(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {        this.doPost(request, response);    }       public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {      String orderNo=request.getParameter("orderNo");      String code=request.getParameter("code");           //获取AccessToken           WeixinOauth2Token token=AdvancedUtil.getOauth2AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);           String openId=token.getOpenId();           //调用微信统一支付接口      SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();     parameters.put("appid", ConfigUtil.APPID);        parameters.put("mch_id", ConfigUtil.MCH_ID);     parameters.put("device_info", "1000");     parameters.put("body", "我的测试订单");     parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());                parameters.put("out_trade_no", orderNo);     //parameters.put("total_fee", String.valueOf(total));     parameters.put("total_fee", "1");     parameters.put("spbill_create_ip", request.getRemoteAddr());     parameters.put("notify_url", ConfigUtil.NOTIFY_URL);     parameters.put("trade_type", "JSAPI");     parameters.put("openid", openId);        String sign = PayCommonUtil.createSign("UTF-8", parameters);     parameters.put("sign", sign);        String requestXML = PayCommonUtil.getRequestXml(parameters);        String result = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);     System.out.println("----------------------------------");     System.out.println(result);     System.out.println("----------------------------------");          request.setAttribute("orderNo", orderNo);     request.setAttribute("totalPrice", "0.01");     String payJSON="";     try {      payJSON=CommonUtil.getH5PayStr(result,request);           } catch (Exception e) {      // TODO Auto-generated catch block      e.printStackTrace();     }     //System.out.println(payJSON);     request.setAttribute("unifiedOrder",payJSON);          RequestDispatcher dis= request.getRequestDispatcher("h5Pay.jsp");     dis.forward(request, response);    }   }

调用微信统一下单接口，需要注意签名算法，只有签名计算正确才能顺利支付

public static String getH5PayStr(String result,HttpServletRequest request) throws Exception{           Map<String, String> map = XMLUtil.doXMLParse(result);                   SortedMap<Object,Object> params = new TreeMap<Object,Object>();      params.put("appId", ConfigUtil.APPID);      params.put("timeStamp", Long.toString(new Date().getTime()));      params.put("nonceStr", PayCommonUtil.CreateNoncestr());      params.put("package", "prepay_id="+map.get("prepay_id"));      params.put("signType", ConfigUtil.SIGN_TYPE);      String paySign = PayCommonUtil.createSign("UTF-8", params);           params.put("paySign", paySign);  //paySign的生成规则和Sign的生成规则一致           String json = JSONObject.fromObject(params).toString();           return json;    }

4 编写最终的支付界面调起微信H5支付

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>   <%   String path = request.getContextPath();   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";   %>      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">   <html>    <head>    <base href="<%=basePath%>">        <title>微信H5支付</title>        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">     <script type="text/javascript">        function jsApiCall(){     WeixinJSBridge.invoke(      'getBrandWCPayRequest',<%=(String)request.getAttribute("unifiedOrder")%>, function(res){       WeixinJSBridge.log(res.err_msg);       //alert(res.err_code+res.err_desc+res.err_msg);       if(res.err_msg == "get_brand_wcpay_request:ok" ) {        alert("恭喜你,支付成功!");       }else{        alert(res.err_code+res.err_desc+res.err_msg);           }      }     );    }       function callpay(){     if (typeof WeixinJSBridge == "undefined"){      if( document.addEventListener ){       document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);      }else if (document.attachEvent){       document.attachEvent('WeixinJSBridgeReady', jsApiCall);       document.attachEvent('onWeixinJSBridgeReady', jsApiCall);      }     }else{      jsApiCall();     }    }    </script>    </head>       <body>     <input type="button" value="支付" onclick="callpay()"/>    </body>   </html>

5 处理微信支付结果通知

package com.debug.weixin.servlet;      import java.io.ByteArrayOutputStream;   import java.io.IOException;   import java.io.InputStream;   import java.io.PrintWriter;   import java.util.Map;      import javax.servlet.ServletException;   import javax.servlet.http.HttpServlet;   import javax.servlet.http.HttpServletRequest;   import javax.servlet.http.HttpServletResponse;      import org.jdom.JDOMException;      import com.debug.weixin.util.PayCommonUtil;   import com.debug.weixin.util.XMLUtil;      public class PayHandlerServlet extends HttpServlet {           public void doGet(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {      this.doPost(request, response);    }           public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {        InputStream inStream = request.getInputStream();     ByteArrayOutputStream outSteam = new ByteArrayOutputStream();     byte[] buffer = new byte[1024];     int len = 0;     while ((len = inStream.read(buffer)) != -1) {      outSteam.write(buffer, 0, len);     }          outSteam.close();     inStream.close();     String result = new String(outSteam.toByteArray(),"utf-8");//获取微信调用我们notify_url的返回信息     Map<Object, Object> map=null;     try {      map = XMLUtil.doXMLParse(result);     } catch (JDOMException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }     for(Object keyValue : map.keySet()){      System.out.println(keyValue+"="+map.get(keyValue));     }     if (map.get("result_code").toString().equalsIgnoreCase("SUCCESS")) {            //对订单进行业务操作      System.out.println("-------------OK");      response.getWriter().write(PayCommonUtil.setXML("SUCCESS", "")); //告诉微信服务器，我收到信息了，不要在调用回调action了           }    }   }

二微信扫码支付（模式一）

要点：必须调用长链接转短链接接口、正确配置扫码支付回调URL

1 根据订单号生成微信支付二维码

下面是几个生成二维码的方法：

package com.debug.weixin.util;   import com.google.zxing.common.BitMatrix;       import javax.imageio.ImageIO;    import java.io.File;    import java.io.OutputStream;    import java.io.IOException;    import java.awt.image.BufferedImage;          public final class MatrixToImageWriter {       private static final int BLACK = 0xFF000000;    private static final int WHITE = 0xFFFFFFFF;       private MatrixToImageWriter() {}           public static BufferedImage toBufferedImage(BitMatrix matrix) {     int width = matrix.getWidth();     int height = matrix.getHeight();     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);     for (int x = 0; x < width; x++) {     for (int y = 0; y < height; y++) {      image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);     }     }     return image;    }        public static void writeToFile(BitMatrix matrix, String format, File file)     throws IOException {     BufferedImage image = toBufferedImage(matrix);     if (!ImageIO.write(image, format, file)) {     throw new IOException("Could not write an image of format " + format + " to " + file);     }    }           public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)     throws IOException {     BufferedImage image = toBufferedImage(matrix);     if (!ImageIO.write(image, format, stream)) {     throw new IOException("Could not write an image of format " + format);     }    }       }

这个算是工具类，还有一个就是把二维码显示在界面上的方法，CreateQRCode主要用到代码块：

 public static void createCodeStream(String text,HttpServletResponse response) throws Exception{         // response.setContentType("image/jpeg");     ServletOutputStream sos = response.getOutputStream();        int width = 500;     int height = 500;     //二维码的图片格式     String format = "jpg";     MultiFormatWriter multiFormatWriter = new MultiFormatWriter();     Map hints = new HashMap();     //内容所使用编码     hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");     BitMatrix bitMatrix = multiFormatWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);             //生成二维码         MatrixToImageWriter.writeToStream(bitMatrix, format,sos);         sos.close();            }

2 长链接转短链接生成二维码，编写扫码支付回调方法并调用统一下单接口

 package com.debug.weixin.servlet;      import java.io.ByteArrayOutputStream;   import java.io.IOException;   import java.io.InputStream;   import java.io.PrintWriter;   import java.util.Date;   import java.util.Map;   import java.util.SortedMap;   import java.util.TreeMap;      import javax.servlet.ServletException;   import javax.servlet.http.HttpServlet;   import javax.servlet.http.HttpServletRequest;   import javax.servlet.http.HttpServletResponse;      import org.jdom.JDOMException;      import com.debug.weixin.util.CommonUtil;   import com.debug.weixin.util.ConfigUtil;   import com.debug.weixin.util.CreateQRCode;   import com.debug.weixin.util.PayCommonUtil;   import com.debug.weixin.util.XMLUtil;   import com.mongodb.DBObject;      public class ScanCodePayServlet extends HttpServlet {           public void doGet(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {     this.doPost(request, response);         }           public void doPost(HttpServletRequest request, HttpServletResponse response)      throws ServletException, IOException {          String flag=request.getParameter("flag");     if("createCode".equals(flag)){      createPayCode(request,response);     }else{      try {       wxScanCodeHandler(request,response);      } catch (Exception e) {       // TODO Auto-generated catch block       e.printStackTrace();      }     }              }        public void createPayCode(HttpServletRequest request,HttpServletResponse response){          String orderNo=request.getParameter("orderNo");          SortedMap<Object,Object> paras = new TreeMap<Object,Object>();     paras.put("appid", ConfigUtil.APPID);     paras.put("mch_id", ConfigUtil.MCH_ID);     paras.put("time_stamp", Long.toString(new Date().getTime()));     paras.put("nonce_str", PayCommonUtil.CreateNoncestr());     paras.put("product_id", orderNo);//商品号要唯一     String sign = PayCommonUtil.createSign("UTF-8", paras);     paras.put("sign", sign);          String url = "weixin://wxpay/bizpayurl?sign=SIGN&appid=APPID&mch_id=MCHID&product_id=PRODUCTID&time_stamp=TIMESTAMP&nonce_str=NOCESTR";     String nativeUrl = url.replace("SIGN", sign).replace("APPID", ConfigUtil.APPID).replace("MCHID", ConfigUtil.MCH_ID).replace("PRODUCTID", (String)paras.get("product_id")).replace("TIMESTAMP", (String)paras.get("time_stamp")).replace("NOCESTR", (String)paras.get("nonce_str"));                 SortedMap<Object,Object> parameters = new TreeMap<Object,Object>();      parameters.put("appid", ConfigUtil.APPID);      parameters.put("mch_id", ConfigUtil.MCH_ID);      parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());      parameters.put("long_url", CommonUtil.urlEncodeUTF8(nativeUrl));      String sign2 = PayCommonUtil.createSign("UTF-8", parameters);      parameters.put("sign", sign2);      String requestXML = PayCommonUtil.getRequestXml(parameters);      String result =CommonUtil.httpsRequestForStr(ConfigUtil.SHORT_URL, "POST", requestXML);           Map<String, String> map=null;     try {      map = XMLUtil.doXMLParse(result);     } catch (JDOMException e) {      // TODO Auto-generated catch block      e.printStackTrace();     } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }      String returnCode = map.get("return_code");      String resultCode = map.get("result_code");           if(returnCode.equalsIgnoreCase("SUCCESS")&&resultCode.equalsIgnoreCase("SUCCESS")){             String shortUrl = map.get("short_url");       //TODO 拿到shortUrl，写代码生成二维码       System.out.println("shortUrl="+shortUrl);       try {       CreateQRCode.createCodeStream(shortUrl,response);       } catch (Exception e) {       // TODO Auto-generated catch block       e.printStackTrace();       }     }    }            public void wxScanCodeHandler(HttpServletRequest request,HttpServletResponse response) throws Exception {     InputStream inStream = request.getInputStream();     ByteArrayOutputStream outSteam = new ByteArrayOutputStream();     byte[] buffer = new byte[1024];     int len = 0;     while ((len = inStream.read(buffer)) != -1) {      outSteam.write(buffer, 0, len);     }          outSteam.close();     inStream.close();     String result = new String(outSteam.toByteArray(),"utf-8");//获取微信调用我们notify_url的返回信息     Map<Object, Object> map=null;     try {      map = XMLUtil.doXMLParse(result);     } catch (JDOMException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }     for(Object keyValue : map.keySet()){      System.out.println(keyValue+"="+map.get(keyValue));     }     String orderNo=map.get("product_id").toString();          //接收到请求参数后调用统一下单接口     SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();     parameters.put("appid", ConfigUtil.APPID);        parameters.put("mch_id", ConfigUtil.MCH_ID);     parameters.put("device_info", "1000");     parameters.put("body", "测试扫码支付订单");     parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());                parameters.put("out_trade_no", map.get("product_id"));     //parameters.put("total_fee", String.valueOf(totalPrice));     parameters.put("total_fee", "1");     parameters.put("spbill_create_ip", request.getRemoteAddr());     parameters.put("notify_url", ConfigUtil.NOTIFY_URL);     parameters.put("trade_type", "NATIVE");     parameters.put("openid", map.get("openid"));        String sign = PayCommonUtil.createSign("UTF-8", parameters);         parameters.put("sign", sign);        String requestXML = PayCommonUtil.getRequestXml(parameters);        String result2 = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);          System.out.println("-----------------------------统一下单结果---------------------------");     System.out.println(result2);     Map<String, String> mm=null;     try {      mm=getH5PayMap(result2,request);     } catch (Exception e) {      // TODO Auto-generated catch block      e.printStackTrace();     }     //String prepayId=getPrepayId(result2,request);     //String returnNoneStr=getReturnNoneStr(result2,request);     String prepayId=mm.get("prepay_id");     String returnNoneStr=mm.get("nonce_str");;     SortedMap<Object, Object> lastSign = new TreeMap<Object, Object>();     lastSign.put("return_code", "SUCCESS");     lastSign.put("appid", ConfigUtil.APPID);     lastSign.put("mch_id", ConfigUtil.MCH_ID);     lastSign.put("nonce_str", returnNoneStr);     lastSign.put("prepay_id", prepayId);     lastSign.put("result_code", "SUCCESS");     lastSign.put("key", ConfigUtil.API_KEY);               String lastSignpara = PayCommonUtil.createSign("UTF-8", lastSign);               StringBuffer buf=new StringBuffer();     buf.append("<xml>");     buf.append("<return_code>SUCCESS</return_code>");     buf.append("<appid>"+ConfigUtil.APPID+"</appid>");     buf.append("<mch_id>"+ConfigUtil.MCH_ID+"</mch_id>");     buf.append("<nonce_str>"+returnNoneStr+"</nonce_str>");     buf.append("<prepay_id>"+prepayId+"</prepay_id>");     buf.append("<result_code>SUCCESS</result_code>");     buf.append("<sign>"+lastSignpara+"</sign>");     buf.append("</xml>");          response.getWriter().print(buf.toString());    }        public Map<String, String> getH5PayMap(String result,HttpServletRequest request) throws Exception{           Map<String, String> map = XMLUtil.doXMLParse(result);      return map;    }      }

最终看下公众号支付和扫码支付的微信配置：