Java微信支付之公眾號支付、掃碼支付實例

2019-11-26 13:37:14

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微信支付現在已經變得越來越流行了，隨之也出現了很多以可以快速接入微信支付為噱頭的產品，不過方便之余也使得我們做東西慢慢依賴第三方，喪失了獨立思考的能力，這次打算分享下我之前開發過的微信支付。

一、H5公眾號支付

要點：正確獲取openId以及統一下單接口，正確處理支付結果通知，正確配置支付授權目錄

H5的支付方式是使用較為廣泛的方式，這種支付方式主要用于微信內自定義菜單的網頁，依賴手機上安裝的微信客戶端，高版本的微信才支持微信支付，下面按我的流程注意說明

1 編寫用于支付的頁面，由于是測試用就寫的簡單了點

<%@ 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>微信支付樣例</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">     訂單號：<input type="text" name="orderNo" />   <input type="submit" value="H5支付"/>  </form>  </br></br>   <form action="scanCodePayServlet?flag=createCode" method="POST">     訂單號：<input type="text" name="orderNo" />   <input type="submit" value="掃碼支付"/>  </form>  </body> </html>

2 編寫一個servlet用于通過Oauth獲取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");    //調用微信Oauth2.0獲取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 獲取到code后，通過REDIRECTURI獲取openId,調用統一下單接口

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");       //獲取AccessToken       WeixinOauth2Token token=AdvancedUtil.getOauth2AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);       String openId=token.getOpenId();       //調用微信統一支付接口    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", "我的測試訂單");   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);  }  }

調用微信統一下單接口，需要注意簽名算法，只有簽名計算正確才能順利支付

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的生成規則和Sign的生成規則一致       String json = JSONObject.fromObject(params).toString();       return json;  }

4 編寫最終的支付界面調起微信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 處理微信支付結果通知

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");//獲取微信調用我們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")) {        //對訂單進行業務操作    System.out.println("-------------OK");    response.getWriter().write(PayCommonUtil.setXML("SUCCESS", "")); //告訴微信服務器，我收到信息了，不要在調用回調action了       }  }  }

對于上面的代碼，有很多都是參考http://blog.csdn.net/u011160656/article/details/41759195，因此這部分的代碼就不貼出來了，需要的話看這個博客就知道了。

二微信掃碼支付（模式一）

要點：必須調用長鏈接轉短鏈接接口、正確配置掃碼支付回調URL

1 根據訂單號生成微信支付二維碼

下面是幾個生成二維碼的方法：

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);   }  }   }

這個算是工具類，還有一個就是把二維碼顯示在界面上的方法，CreateQRCode主要用到代碼塊：

 public static void createCodeStream(String text,HttpServletResponse response) throws Exception{     // response.setContentType("image/jpeg");   ServletOutputStream sos = response.getOutputStream();    int width = 500;   int height = 500;   //二維碼的圖片格式   String format = "jpg";   MultiFormatWriter multiFormatWriter = new MultiFormatWriter();   Map hints = new HashMap();   //內容所使用編碼   hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");   BitMatrix bitMatrix = multiFormatWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);       //生成二維碼     MatrixToImageWriter.writeToStream(bitMatrix, format,sos);     sos.close();      }

2 長鏈接轉短鏈接生成二維碼，編寫掃碼支付回調方法并調用統一下單接口

 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);//商品號要唯一   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，寫代碼生成二維碼     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");//獲取微信調用我們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();      //接收到請求參數后調用統一下單接口   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", "測試掃碼支付訂單");   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("-----------------------------統一下單結果---------------------------");   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;  }  }

最終看下公眾號支付和掃碼支付的微信配置：