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Java微信支付之公眾號支付、掃碼支付實例

高洛峰
高洛峰原創
2017-02-04 11:30:441633瀏覽

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，不過方便之餘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於微信內自訂選單的網頁，依賴手機上安裝的微信客戶端，高版本的微信才支援微信支付，下面按我的流程注意說明

1  編寫用於支付的頁面，由於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  編寫一個servlet用於通過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"); 
   //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 獲取到code後，透過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"); 
    
   //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); 
 } 
  
}

調用微信統一下單接口，需要注意簽名演算法，只有簽章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的生成规则和Sign的生成规则一致 
    
   String json = JSONObject.fromObject(params).toString(); 
    
   return json; 
 }

 4 寫最終的支付介面調起微信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( 
   &#39;getBrandWCPayRequest&#39;,<%=(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(&#39;WeixinJSBridgeReady&#39;, jsApiCall, false); 
   }else if (document.attachEvent){ 
    document.attachEvent(&#39;WeixinJSBridgeReady&#39;, jsApiCall); 
    document.attachEvent(&#39;onWeixinJSBridgeReady&#39;, 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");//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 
     
  } 
 } 
  
}

對於上面的程式碼，有很多都是參考http://blog .csdn.net/u011160656/article/details/41759195，因此這部分的程式碼就不貼出來了，需要的話看這篇部落格就知道了。

二  微信掃碼支付（模式一）

要點：必須呼叫長連結轉短連結介面、正確設定掃碼支付回呼URL

1 根據訂單號碼產生微信支付二維碼

下面是幾個產生二維碼的方法：

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介面上的方法，CreateQRCode主要用到程式碼區塊：

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 長連結轉短連結產生二維碼，寫掃碼支付回呼方法並調用統一下單接口

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; 
 } 
  
}

最終看下公眾號支付和掃碼支付的微信配置：

Java微信支付之公眾號支付、掃碼支付實例Java微信支付之公眾號支付、掃碼支付實例

希望透過這篇文章，大家能明白就算透過Java來做微信公眾號、微信支付而不借助github提供的那些坑人的程式碼也可以開發出另自己和客戶滿意的微信應用。雖然微信給的demo都是PHP的，但這些都是浮雲，開發語言是其次，理解介面呼叫需具備的底層只是才是程式設計師的必修課。

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