java微信扫码支付详细说明
最近由于业务需要，参考别人的代码，然后加上自己整合，总算写出来了，在这里得跟大家一起分享下。
这是官方开发文档模式二的地址：https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=6_5
大家可以仔细看看这里面，里面的内容我就不写了，大家可以自己看。
先看看我的项目结构：
pom文件的依赖：
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.4.RELEASE
com.wky
wechat
0.0.1-SNAPSHOT
wechat
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-web
com.google.zxing
core
3.2.1
commons-logging
commons-logging
1.1.1
net.sf.ezmorph
ezmorph
1.0.6
org.apache.tomcat.embed
tomcat-embed-jasper
provided
net.sf.json-lib
json-lib
2.2.3
jdk15
com.github.wxpay
wxpay-sdk
0.0.3
com.alibaba
fastjson
1.2.24
com.google.code.gson
gson
2.8.2
org.apache.tomcat.embed
tomcat-embed-core
org.springframework.boot
spring-boot-starter-test
test
com.thoughtworks.xstream
xstream
1.4.4
commons-httpclient
commons-httpclient
3.0
dom4j
dom4j
1.6.1
org.jdom
jdom
1.1
com.orhanobut
logger
1.14
log4j
log4j
1.2.17
org.slf4j
slf4j-api
1.7.25
org.slf4j
slf4j-log4j12
1.7.25
test
org.slf4j
slf4j-simple
1.7.25
test
org.springframework.boot
spring-boot-starter-tomcat
compile
org.apache.httpcomponents
httpclient
4.4
org.springframework.boot
spring-boot-maven-plugin
先来看看util包下面的几个工具类代码：
MD5Util：
package com.wky.wechat.Util;
import java.security.MessageDigest;
public class MD5Util {
//md5加密
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));
return resultSb.toString();
}
public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}
private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}
XMLUtil：
package com.wky.wechat.Util;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
public class XMLUtil {
/**
* 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
* @param strxml
* @return
* @throws JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws JDOMException, IOException {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
if(null == strxml || "".equals(strxml)) {
return null;
}
Map m = new HashMap();
InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(in);
Element root = doc.getRootElement();
List list = root.getChildren();
Iterator it = list.iterator();
while(it.hasNext()) {
Element e = (Element) it.next();
String k = e.getName();
String v = "";
List children = e.getChildren();
if(children.isEmpty()) {
v = e.getTextNormalize();
} else {
v = XMLUtil.getChildrenText(children);
}
m.put(k, v);
}
//关闭流
in.close();
return m;
}
/**
59 * 获取子结点的xml
60 * @param children
61 * @return String
62 */
public static String getChildrenText(List children) {
StringBuffer sb = new StringBuffer();
if(!children.isEmpty()) {
Iterator it = children.iterator();
while(it.hasNext()) {
Element e = (Element) it.next();
String name = e.getName();
String value = e.getTextNormalize();
List list = e.getChildren();
sb.append("<" + name + ">");
if(!list.isEmpty()) {
sb.append(XMLUtil.getChildrenText(list));
}
sb.append(value);
sb.append("");
}
}
return sb.toString();
}
}
HttpUtil：
package com.wky.wechat.Util;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
public class HttpUtil {
//用http连接提交支付信息参数
private static final Log logger = LogFactory.getLog("org.apache.catalina.tribes.MESSAGES" );
private final static int CONNECT_TIMEOUT = 5000; // in milliseconds
private final static String DEFAULT_ENCODING = "UTF-8";
public static String postData(String urlStr, String data){
return postData(urlStr, data, null);
}
public static String postData(String urlStr, String data, String contentType){
BufferedReader reader = null;
try {
URL url = new URL(urlStr);
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
conn.setConnectTimeout(CONNECT_TIMEOUT);
conn.setReadTimeout(CONNECT_TIMEOUT);
if(contentType != null)
conn.setRequestProperty("content-type", contentType);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);
if(data == null)
data = "";
writer.write(data);
writer.flush();
writer.close();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));
System.out.println(reader.toString());
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append("\r\n");
}
return sb.toString();
} catch (IOException e) {
logger.error("Error connecting to " + urlStr + ": " + e.getMessage());
} finally {
try {
if (reader != null)
reader.close();
} catch (IOException e) {
}
}
return null;
}
}
GetWeixinUrlUtil：
package com.wky.wechat.Util;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import org.apache.commons.lang.StringUtils;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
public class GetWeixinUrlUtil {
private static final int BLACK = 0xff000000;
private static final int WHITE = 0xFFFFFFFF;
//获取二维码url
public static String weixin_pay(String ip) throws Exception {
// 账号信息
String appid = PayConfigUtil.APP_ID; // appid
String mch_id = PayConfigUtil.MCH_ID; // 商户号
String key = PayConfigUtil.API_KEY; // key
String currTime = PayCommonUtil.getCurrTime();
String strTime = currTime.substring(8, currTime.length());
String strRandom = PayCommonUtil.buildRandom(4) + "";
String nonce_str = strTime + strRandom;
int order_price = 1; // 商品价格 注意：价格的单位是分
String body = "商品名称"; // 商品名称
String out_trade_no = PayCommonUtil.getCurrTime() + PayCommonUtil.buildRandom(4); // 商户订单号
// 获取发起电脑 ip
String spbill_create_ip = ip;
// 回调接口
String notify_url = PayConfigUtil.NOTIFY_URL;
String trade_type = "NATIVE"; //交易类型
SortedMap packageParams = new TreeMap();
packageParams.put("appid", appid);
packageParams.put("mch_id", mch_id);
packageParams.put("nonce_str", nonce_str);
packageParams.put("body", body);
packageParams.put("out_trade_no", out_trade_no);
packageParams.put("total_fee", String.valueOf(order_price));
packageParams.put("spbill_create_ip", spbill_create_ip);
packageParams.put("notify_url", notify_url);
packageParams.put("trade_type", trade_type);
//生成签名
String sign = PayCommonUtil.createSign("UTF-8", packageParams,key);
packageParams.put("sign", sign);
String requestXML = PayCommonUtil.getRequestXml(packageParams);
System.out.println(requestXML);
String resXml = HttpUtil.postData(PayConfigUtil.UFDODER_URL, requestXML);
Map map = XMLUtil.doXMLParse(resXml);
String urlCode = (String) map.get("code_url");
System.out.println(urlCode);
return urlCode;
}
// 特殊字符处理
public static String UrlEncode(String src) throws UnsupportedEncodingException {
return URLEncoder.encode(src, "UTF-8").replace("+", "%20");
}
/**
* 将路径生成二维码图片
* @author xiaoloutingyu
* @param content
* @param response
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void encodeQrcode(String content, HttpServletResponse response){
if(StringUtils.isBlank(content))
return;
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map hints = new HashMap();
BitMatrix bitMatrix = null;
try {
bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 250, 250,hints);
BufferedImage image = toBufferedImage(bitMatrix);
//输出二维码图片流
try {
ImageIO.write(image, "png", response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
} catch (WriterException e1) {
e1.printStackTrace();
}
}
/**
* 类型转换
* @author xiaoloutingyu
* @param matrix
* @return
*/
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) == true ? BLACK : WHITE);
}
}
return image;
}
}
PayCommonUtil：
package com.wky.wechat.Util;
import java.text.SimpleDateFormat;
import java.util.*;
public class PayCommonUtil {
/**
* 是否签名正确,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
* @return boolean
*/
public static boolean isTenpaySign(String characterEncoding, SortedMap packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
String v = (String)entry.getValue();
if(!"sign".equals(k) && null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
//算出摘要
String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();
//System.out.println(tenpaySign + " " + mysign);
return tenpaySign.equals(mysign);
}
/**
* @author xiaoloutingyu
* @date 2016-4-22
* @Description：sign签名
* @param characterEncoding
* 编码格式
* @param
*
* @return
*/
public static String createSign(String characterEncoding, SortedMap packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
/**
65 * @author xiaoloutingyu
66 * @date 2016-4-22
67 * @Description：将请求参数转换为xml格式的string
68 * @param parameters
69 * 请求参数
70 * @return
71 */
public static String getRequestXml(SortedMap parameters) {
StringBuffer sb = new StringBuffer();
sb.append("");
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + "");
} else {
sb.append("<" + k + ">" + v + "");
}
}
sb.append(" ");
return sb.toString();
}
/**
92 * 取出一个指定长度大小的随机正整数.
93 *
94 * @param length
95 * int 设定所取出随机数的长度。length小于11
96 * @return int 返回生成的随机数。
97 */
public static int buildRandom(int length) {
int num = 1;
double random = Math.random();
if (random < 0.1) {
random = random + 0.1;
}
for (int i = 0; i < length; i++) {
num = num * 10;
}
return (int) ((random * num));
}
/**
111 * 获取当前时间 yyyyMMddHHmmss
112 *
113 * @return String
114 */
public static String getCurrTime() {
Date now = new Date();
SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");
String s = outFormat.format(now);
return s;
}
}
PayConfigUtil：
package com.wky.wechat.Util;
import javax.servlet.http.HttpServletRequest;
public class PayConfigUtil {
//这里的必要参数填写自己的，另外回调地址必须是外网能访问的，我这里是用netapp开通了一个隧道，免费的，大家测试的时候也可以申请个，可以百度netapp教程几分钟学习一下就可以
public static final String APP_ID = "";//微信开发平台应用ID(公众号ID)
public static final String MCH_ID = "";//商户号(商户号ID)
public static final String API_KEY = "";//API key(商户号里面的)
public static final String CREATE_IP = "";//发起支付的ip
public static final String NOTIFY_URL = "";//回调地址
public static final String UFDODER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";//微信统一下单接口
public static final String APP_SECRET = "4b438be89862ab64a2cb2960a8f696bd";//应用对应的凭证(在公众号里面)
//获取ip
public static String getIP(HttpServletRequest request)
{
String ip = request.getRemoteAddr();
return ip;
}
}
service层：
WechatService：
package com.wky.wechat.Service;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public interface WechatService {
void weixin_notify(HttpServletRequest request, HttpServletResponse response) throws Exception;
;
}
看看实现类的代码：
package com.wky.wechat.Service.impl;
import com.wky.wechat.Service.WechatService;
import com.wky.wechat.Util.PayCommonUtil;
import com.wky.wechat.Util.PayConfigUtil;
import com.wky.wechat.Util.XMLUtil;
import org.springframework.stereotype.Service;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.*;
@Service
public class WechatServiceImpl implements WechatService {
@Override
public void weixin_notify(HttpServletRequest request, HttpServletResponse response) throws Exception {
System.out.println("调用回调方法");
//读取参数
InputStream inputStream ;
StringBuffer sb = new StringBuffer();
inputStream = request.getInputStream();
String s ;
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((s = in.readLine()) != null){
sb.append(s);
}
in.close();
inputStream.close();
//解析xml成map
Map m = new HashMap();
m = XMLUtil.doXMLParse(sb.toString());
//过滤空 设置 TreeMap
SortedMap packageParams = new TreeMap();
Iterator it = m.keySet().iterator();
while (it.hasNext()) {
String parameter = (String) it.next();
String parameterValue = m.get(parameter);
String v = "";
if(null != parameterValue) {
v = parameterValue.trim();
}
packageParams.put(parameter, v);
}
// 账号信息
String key = PayConfigUtil.API_KEY; // key
//logger.info(packageParams);
System.out.println(packageParams);
//判断签名是否正确
if(PayCommonUtil.isTenpaySign("UTF-8", packageParams,key)) {
//------------------------------
//处理业务开始
//------------------------------
String resXml = "";
if("SUCCESS".equals((String) packageParams.get("result_code"))){
// 这里是支付成功
//////////执行自己的业务逻辑////////////////
String mch_id = (String) packageParams.get("mch_id");
String openid = (String) packageParams.get("openid");
String is_subscribe = (String) packageParams.get("is_subscribe");
String out_trade_no = (String) packageParams.get("out_trade_no");
String total_fee = (String) packageParams.get("total_fee");
String cash_fee_s = (String) packageParams.get("cash_fee");
String cash_fee = String.valueOf(Integer.parseInt(cash_fee_s) / 100);
//String time_end = MctsUtils.numberDateToDate((String) packageParams.get("time_end"));
String transaction_id = (String) packageParams.get("transaction_id");
//////////执行自己的业务逻辑（报存订单信息到数据库）////////////////
System.out.println("支付成功 ,处理业务成功");
//logger.info("支付成功");
//通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
resXml = "" + " ";
//------------------------------
//处理业务完毕
//------------------------------
//向微信服务器发送确认信息，若不发送，微信服务器会间隔不同的时间调用回调方法
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
System.out.println("通知微信.异步确认成功");
} else {
System.out.println("支付失败,错误信息：" + packageParams.get("err_code"));
// logger.info("支付失败,错误信息：" + packageParams.get("err_code"));
resXml = "" + " ";
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
System.out.println("执行回调函数失败");
}
} else{
//logger.info("通知签名验证失败");
System.out.println("通知签名验证失败");
}
}
}
controller：
@RequestMapping(value="/image",method = RequestMethod.GET)
public void payWexin(@RequestParam String ip, HttpServletResponse response)throws Exception{
String url=GetWeixinUrlUtil.weixin_pay(ip);
GetWeixinUrlUtil.encodeQrcode(url,response);
}
