提示：仅微信支付功能模块类，可供参考，可点赞

一、java后台实现源码

package cn.xydx.crowdfunding.controller;

import cn.xydx.crowdfunding.util.HttpRequest;

import cn.xydx.crowdfunding.util.WXPayUtil;

import org.json.JSONObject;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.CrossOrigin;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;

import java.util.Map;

import java.util.Random;

import static cn.xydx.crowdfunding.util.WXPayConfig.appid;

import static cn.xydx.crowdfunding.util.WXPayConfig.appsecret;

import static cn.xydx.crowdfunding.util.WXPayConfig.mch_id;

import static cn.xydx.crowdfunding.util.WXPayConfig.key;

@Controller

@RequestMapping(value = "WeixinService")

@CrossOrigin

public class WeixinPayController {

/**

* @param request

* @param code

* @return Map

* @Description 微信浏览器内微信支付/公众号支付(JSAPI)

*/

@RequestMapping(value = "orders", method = RequestMethod.GET)

@ResponseBody

public Map orders(HttpServletRequest request, String code) {

try {

//页面获取openId接口

String getopenid_url = "https://api.weixin.qq.com/sns/oauth2/access_token";

String param = "appid=" + appid + "&secret=" + appsecret + "&code=" + code + "&grant_type=authorization_code";

// 向微信服务器发送get请求获取openIdStr

String openIdStr = HttpRequest.sendGet(getopenid_url, param);

// JSONObject json = JSONObject.parseObject(openIdStr);//转成Json格式

JSONObject json = new JSONObject(openIdStr);

String openId = json.getString("openid");//获取openId

//拼接统一下单地址参数

Map paraMap = new HashMap();

//获取请求ip地址

String ip = request.getHeader("x-forwarded-for");

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

ip = request.getHeader("Proxy-Client-IP");

}

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

ip = request.getHeader("WL-Proxy-Client-IP");

}

if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {

ip = request.getRemoteAddr();

}

if (ip.indexOf(",") != -1) {

String[] ips = ip.split(",");

ip = ips[0].trim();

}

paraMap.put("appid", appid);

paraMap.put("mch_id", mch_id);

paraMap.put("nonce_str", WXPayUtil.generateNonceStr());

paraMap.put("body", "CrowdFund");

paraMap.put("out_trade_no", getOrderSn());//订单号

paraMap.put("total_fee", "1");

paraMap.put("spbill_create_ip", ip);

paraMap.put("notify_url", "http://******/index.html");// 此路径是微信服务器调用支付结果通知路径随意写

paraMap.put("trade_type", "JSAPI");

paraMap.put("openid", openId);

String sign = WXPayUtil.generateSignature(paraMap, key);

paraMap.put("sign", sign);

String xml = WXPayUtil.mapToXml(paraMap);//将所有参数(map)转xml格式

// System.out.println("xml="+xml);

// 统一下单

String unifiedorder_url = "https://api.mch.weixin.qq.com/pay/unifiedorder";

String xmlStr = HttpRequest.sendPost(unifiedorder_url, xml);//发送post请求"统一下单接口"返回预支付id:prepay_id

System.out.println(xmlStr);

//以下内容是返回前端页面的json数据

String prepay_id = "";//预支付id

if (xmlStr.indexOf("SUCCESS") != -1) {

Map map = WXPayUtil.xmlToMap(xmlStr);

prepay_id = (String) map.get("prepay_id");

}

Map payMap = new HashMap();

payMap.put("appId", appid);

payMap.put("timeStamp", WXPayUtil.getCurrentTimestamp() + "");

payMap.put("nonceStr", WXPayUtil.generateNonceStr());

payMap.put("signType", "MD5");

payMap.put("package", "prepay_id=" + prepay_id);

String paySign = WXPayUtil.generateSignature(payMap, key);

payMap.put("paySign", paySign);

// System.out.println("code="+code);

System.out.println("openIdStr="+openIdStr);

return payMap;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

public String getOrderSn() {

//创建不同的日期格式

DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");

Random rm = new Random();

// 获得随机数

double pross = (1 + rm.nextDouble()) * Math.pow(10, 6);

// 将获得的获得随机数转化为字符串

String fixLenthString = String.valueOf(pross);

String dateNum = df.format(new Date()) + "WX" + fixLenthString.substring(1,7);

return dateNum;

}

@RequestMapping(value = "orderquery", method = RequestMethod.GET)

@ResponseBody

public String orderquery() {

try {

Map reqMap = new HashMap();

reqMap.put("appid", appid);

reqMap.put("mch_id", mch_id);

reqMap.put("nonce_str", WXPayUtil.generateNonceStr());

reqMap.put("out_trade_no", getOrderSn()); //商户系统内部的订单号,

String sign = WXPayUtil.generateSignature(reqMap, key);

reqMap.put("sign", sign);

String reqXmlStr = WXPayUtil.mapToXml(reqMap);//将所有参数(map)转xml格式

// System.out.println("xml="+reqXmlStr);

// 查询订单 https://api.mch.weixin.qq.com/pay/orderquery

String orderquery = "https://api.mch.weixin.qq.com/pay/orderquery";

String xmlStr = HttpRequest.sendPost(orderquery, reqXmlStr);

return xmlStr;

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

}

HttpRequest 类

package cn.xydx.crowdfunding.util;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

public class HttpUtil {

/**

* 向指定URL发送GET方法的请求

*

* @param url 发送请求的URL

* //@param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。

* @return URL 所代表远程资源的响应结果

*/

public static String sendGet(String url) {

String result = "";

BufferedReader in = null;

try {

String urlNameString = url ;

URL realUrl = new URL(urlNameString);

// 打开和URL之间的连接

URLConnection connection = realUrl.openConnection();

// 设置通用的请求属性

connection.setRequestProperty("accept", "*/*");

connection.setRequestProperty("connection", "Keep-Alive");

connection.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 建立实际的连接

connection.connect();

// 获取所有响应头字段

Map> map = connection.getHeaderFields();

// 遍历所有的响应头字段

for (String key : map.keySet()) {

System.out.println(key + "--->" + map.get(key));

}

// 定义 BufferedReader输入流来读取URL的响应

in = new BufferedReader(new InputStreamReader(

connection.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送GET请求出现异常！" + e);

e.printStackTrace();

}

// 使用finally块来关闭输入流

finally {

try {

if (in != null) {

in.close();

}

} catch (Exception e2) {

e2.printStackTrace();

}

}

return result;

}

/**

* 向指定 URL 发送POST方法的请求

*

* @param url 发送请求的 URL

* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。

* @return 所代表远程资源的响应结果

*/

public static String sendPost(String url, String param) {

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try {

URL realUrl = new URL(url);

// 打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

// 设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

// 发送请求参数

out.print(param);

// flush输出流的缓冲

out.flush();

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送 POST 请求出现异常！" + e);

e.printStackTrace();

}

//使用finally块来关闭输出流、输入流

finally {

try {

if (out != null) {

out.close();

}

if (in != null) {

in.close();

}

} catch (IOException ex) {

ex.printStackTrace();

}

}

return result;

}

}

WXPayUtil 类

package cn.xydx.crowdfunding.util;

import cn.xydx.crowdfunding.util.WXPayConstants.SignType;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import java.io.ByteArrayInputStream;

import java.io.InputStream;

import java.io.StringWriter;

import java.security.MessageDigest;

import java.security.SecureRandom;

import java.util.*;

public class WXPayUtil {

private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

private static final Random RANDOM = new SecureRandom();

/**

* XML格式字符串转换为Map

*

* @param strXML XML字符串

* @return XML数据转换后的Map

* @throws Exception

*/

public static Map xmlToMap(String strXML) throws Exception {

try {

Map data = new HashMap();

DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder();

InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));

org.w3c.dom.Document doc = documentBuilder.parse(stream);

doc.getDocumentElement().normalize();

NodeList nodeList = doc.getDocumentElement().getChildNodes();

for (int idx = 0; idx < nodeList.getLength(); ++idx) {

Node node = nodeList.item(idx);

if (node.getNodeType() == Node.ELEMENT_NODE) {

org.w3c.dom.Element element = (org.w3c.dom.Element) node;

data.put(element.getNodeName(), element.getTextContent());

}

}

try {

stream.close();

} catch (Exception ex) {

// do nothing

}

return data;

} catch (Exception ex) {

WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);

throw ex;

}

}

/**

* 将Map转换为XML格式的字符串

*

* @param data Map类型数据

* @return XML格式的字符串

* @throws Exception

*/

public static String mapToXml(Map data) throws Exception {

org.w3c.dom.Document document = WXPayXmlUtil.newDocument();

org.w3c.dom.Element root = document.createElement("xml");

document.appendChild(root);

for (String key: data.keySet()) {

String value = data.get(key);

if (value == null) {

value = "";

}

value = value.trim();

org.w3c.dom.Element filed = document.createElement(key);

filed.appendChild(document.createTextNode(value));

root.appendChild(filed);

}

TransformerFactory tf = TransformerFactory.newInstance();

Transformer transformer = tf.newTransformer();

DOMSource source = new DOMSource(document);

transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");

transformer.setOutputProperty(OutputKeys.INDENT, "yes");

StringWriter writer = new StringWriter();

StreamResult result = new StreamResult(writer);

transformer.transform(source, result);

String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");

try {

writer.close();

}

catch (Exception ex) {

}

return output;

}

/**

* 生成带有 sign 的 XML 格式字符串

*

* @param data Map类型数据

* @param key API密钥

* @return 含有sign字段的XML

*/

public static String generateSignedXml(final Map data, String key) throws Exception {

return generateSignedXml(data, key, SignType.MD5);

}

/**

* 生成带有 sign 的 XML 格式字符串

*

* @param data Map类型数据

* @param key API密钥

* @param signType 签名类型

* @return 含有sign字段的XML

*/

public static String generateSignedXml(final Map data, String key, SignType signType) throws Exception {

String sign = generateSignature(data, key, signType);

data.put(WXPayConstants.FIELD_SIGN, sign);

return mapToXml(data);

}

/**

* 判断签名是否正确

*

* @param xmlStr XML格式数据

* @param key API密钥

* @return 签名是否正确

* @throws Exception

*/

public static boolean isSignatureValid(String xmlStr, String key) throws Exception {

Map data = xmlToMap(xmlStr);

if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {

return false;

}

String sign = data.get(WXPayConstants.FIELD_SIGN);

return generateSignature(data, key).equals(sign);

}

/**

* 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。

*

* @param data Map类型数据

* @param key API密钥

* @return 签名是否正确

* @throws Exception

*/

public static boolean isSignatureValid(Map data, String key) throws Exception {

return isSignatureValid(data, key, SignType.MD5);

}

/**

* 判断签名是否正确，必须包含sign字段，否则返回false。

*

* @param data Map类型数据

* @param key API密钥

* @param signType 签名方式

* @return 签名是否正确

* @throws Exception

*/

public static boolean isSignatureValid(Map data, String key, SignType signType) throws Exception {

if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {

return false;

}

String sign = data.get(WXPayConstants.FIELD_SIGN);

return generateSignature(data, key, signType).equals(sign);

}

/**

* 生成签名

*

* @param data 待签名数据

* @param key API密钥

* @return 签名

*/

public static String generateSignature(final Map data, String key) throws Exception {

return generateSignature(data, key, SignType.MD5);

}

/**

* 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。

*

* @param data 待签名数据

* @param key API密钥

* @param signType 签名方式

* @return 签名

*/

public static String generateSignature(final Map data, String key, SignType signType) throws Exception {

Set keySet = data.keySet();

String[] keyArray = keySet.toArray(new String[keySet.size()]);

Arrays.sort(keyArray);

StringBuilder sb = new StringBuilder();

for (String k : keyArray) {

if (k.equals(WXPayConstants.FIELD_SIGN)) {

continue;

}

if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名

sb.append(k).append("=").append(data.get(k).trim()).append("&");

}

sb.append("key=").append(key);

if (SignType.MD5.equals(signType)) {

return MD5(sb.toString()).toUpperCase();

}

else if (SignType.HMACSHA256.equals(signType)) {

return HMACSHA256(sb.toString(), key);

}

else {

throw new Exception(String.format("Invalid sign_type: %s", signType));

}

}

/**

* 获取随机字符串 Nonce Str

*

* @return String 随机字符串

*/

public static String generateNonceStr() {

char[] nonceChars = new char[32];

for (int index = 0; index < nonceChars.length; ++index) {

nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));

}

return new String(nonceChars);

}

/**

* 生成 MD5

*

* @param data 待处理数据

* @return MD5结果

*/

public static String MD5(String data) throws Exception {

java.security.MessageDigest md = MessageDigest.getInstance("MD5");

byte[] array = md.digest(data.getBytes("UTF-8"));

StringBuilder sb = new StringBuilder();

for (byte item : array) {

sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));

}

return sb.toString().toUpperCase();

}

/**

* 生成 HMACSHA256

* @param data 待处理数据

* @param key 密钥

* @return 加密结果

* @throws Exception

*/

public static String HMACSHA256(String data, String key) throws Exception {

Mac sha256_HMAC = Mac.getInstance("HmacSHA256");

SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");

sha256_HMAC.init(secret_key);

byte[] array = sha256_HMAC.doFinal(data.getBytes("UTF-8"));

StringBuilder sb = new StringBuilder();

for (byte item : array) {

sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));

}

return sb.toString().toUpperCase();

}

/**

* 日志

* @return

*/

public static Logger getLogger() {

Logger logger = LoggerFactory.getLogger("wxpay java sdk");

return logger;

}

/**

* 获取当前时间戳，单位秒

* @return

*/

public static long getCurrentTimestamp() {

return System.currentTimeMillis()/1000;

}

/**

* 获取当前时间戳，单位毫秒

* @return

*/

public static long getCurrentTimestampMs() {

return System.currentTimeMillis();

}

}

二、前端支付关键模块

立即订购

需要上面的连接获取code

//获取code

function getQueryString(name) {

var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");

var r = window.location.search.substr(1).match(reg);

if (r != null) return unescape(r[2]); return null;

}

var code = getQueryString("code");

if (code) {

var url = "http://******/WeixinService/orders?code=" + code + "";

$.get(url, function (data) {

var appid = data.appId;

var timeStamp = data.timeStamp;

var nonceStr = data.nonceStr;

var package = data.package;

var signType = data.signType;

var paySign = data.paySign;

if (typeof WeixinJSBridge == "undefined") {

if (document.addEventListener) {

document.addEventListener('WeixinJSBridgeReady',

onBridgeReady, false);

} else if (document.attachEvent) {

document.attachEvent('WeixinJSBridgeReady',

onBridgeReady);

document.attachEvent('onWeixinJSBridgeReady',

onBridgeReady);

}

} else {

// onBridgeReady();

WeixinJSBridge.invoke('getBrandWCPayRequest', {

"appId": appid, //公众号名称,由商户传入

"timeStamp": timeStamp, //时间戳,自1970年以来的秒数

"nonceStr": nonceStr, //随机串

"package": package,

"signType": signType, //微信签名方式：

"paySign": paySign //微信签名

},

function (res) {

if (res.err_msg == "get_brand_wcpay_request:ok") {

//console.log('支付成功');

// 支付成功后比如新增数据

$.post("http://******/saveUser", {

userName: $('#inputName').val(),

userIdentity: $('#inputIdentity').val(),

companyName: $('#inputCompany').val(),

userPhone: $('#inputPhone').val()

},

function (data, status) {

alert("数据: \n你好！" + $('#inputName').val() + "\n状态: " + status);

},

"json"

);

//支付成功后跳转的页面

alert("支付成功!将返回首页!请分享******!");

window.history.go(-1);

} else if (res.err_msg == "get_brand_wcpay_request:cancel") {

//console.log('支付取消');

alert("支付取消!保证数据安全 重新参加订购!");

//WeixinJSBridge.call('closeWindow');

window.history.go(-1);

} else if (res.err_msg == "get_brand_wcpay_request:fail") {

//console.log('支付失败');

alert("支付失败!重复支付，建议稍后参加订购");

WeixinJSBridge.call('closeWindow');

} //使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回ok,但并不保证它绝对可靠。

});

}

}, "json")

} else {

alert("服务器异常")

}

提示：前端关键通过http连接生成code。后端最后获取reqXmlStr若不成功，可重置商户秘钥key。

总结

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