Java微信支付之公众号支付、扫码支付实例
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codepackage 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openidString redirectURL=ServerConfig.SERVERDOMAIN+"/BasicWeixin/payServletForH5?orderNo="+orderNo;String redirectURI="";try {redirectURI=CommonUtil.initOpenId(redirectURL);} catch (Exception e) {// TODO Auto-generated catch blocke.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AccessTokenWeixinOauth2Token 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 blocke.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 blocke.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 blocke.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 blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.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 blocke.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 blocke.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 blocke.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：
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。
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