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Java微信支付之公众号支付、扫码支付实例

高洛峰
发布： 2017-02-04 11:30:44
原创
1639 人浏览过

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>
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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); 
 } 
  
}
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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); 
 } 
  
}
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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; 
 }
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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( 
   &#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>
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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 
     
  } 
 } 
  
}
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对于上面的代码，有很多都是参考http://blog.csdn.net/u011160656/article/details/41759195，因此这部分的代码就不贴出来了，需要的话看这个博客就知道了。

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); 
  } 
 } 
  
 }
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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(); 
  
  
}
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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; 
 } 
  
}
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最终看下公众号支付和扫码支付的微信配置：

Java微信支付之公众号支付、扫码支付实例Java微信支付之公众号支付、扫码支付实例

希望通过这篇文章，大家能明白就算通过Java来做微信公众号、微信支付而不借助github提供的那些坑人的代码也可以开发出另自己和客户满意的微信应用。虽然微信给出的demo都是PHP的，但这些都是浮云，开发语言是其次，理解接口调用需具备的底层只是才是程序员的必修课。

更多Java微信支付之公众号支付、扫码支付实例相关文章请关注PHP中文网！

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