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<String, String> paraMap = new HashMap<String, String>();
//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<String, String> map = WXPayUtil.xmlToMap(xmlStr);
prepay_id = (String) map.get("prepay_id");
}
Map<String, String> payMap = new HashMap<String, String>();
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<String, String> reqMap = new HashMap<String, String>();
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<String, List<String>> 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<String, String> xmlToMap(String strXML) throws Exception {
try {
Map<String, String> data = new HashMap<String, String>();
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<String, String> 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<String, String> 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<String, String> 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<String, String> 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<String, String> 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<String, String> 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<String, String> 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<String, String> data, String key, SignType signType) throws Exception {
Set<String> 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
<li><a href="https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx49bdfbb5fa7144**&redirect_uri=http://******/order.html&response_type=code&scope=snsapi_base#wechat_redirect" rel="external nofollow" >立即订购</a></li>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
到此这篇关于java微信支付功能实现源码的文章就介绍到这了。
