Java微信支付之公众号支付、扫码支付实例-eolink官网

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。

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：

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);

}

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

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);

}

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.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

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.ServYvmxdVmxgletException;

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 createPayCohttp://de(HttpServletRequest request,HttpServletResponse response){

String orderNo=request.getParameter("orderNo");

SortedMap

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.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

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.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.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;

}

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