Java微信支付之公众号支付、扫码支付的示例分析

这篇文章主要介绍Java微信支付之公众号支付、扫码支付的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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+"/"; %>                              
     订单号：     
  

   
     订单号：     
   

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Oauth3.0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.WeixinOauth3Token; 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        WeixinOauth3Token token=AdvancedUtil.getOauth3AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);        String openId=token.getOpenId();        //调用微信统一支付接口    SortedMap parameters = new TreeMap();   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("h6Pay.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 map = XMLUtil.doXMLParse(result);               SortedMap params = new TreeMap();    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+"/"; %>                                 

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 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        }  }   }

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);   }  }    }

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 paras = new TreeMap();   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 parameters = new TreeMap();    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 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 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 parameters = new TreeMap();   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 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 lastSign = new TreeMap();   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("");   buf.append("SUCCESS");   buf.append(""+ConfigUtil.APPID+"");   buf.append(""+ConfigUtil.MCH_ID+"");   buf.append(""+returnNoneStr+"");   buf.append(""+prepayId+"");   buf.append("SUCCESS");   buf.append(""+lastSignpara+"");   buf.append("");       response.getWriter().print(buf.toString());  }     public Map getH5PayMap(String result,HttpServletRequest request) throws Exception{        Map 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：

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