在开发中我们经常会使用到支付功能，目前国内使用频率高的支付方式有微信支付和支付宝支付，apple pay和三星pay没有深入研究过，我们暂时不考虑这两个支付。
下面我们来先讲讲支付的基本流程
A、客户端发起支付订单
不管是web端还是手机端，发起订单是都有对你发起的订单的数据进行签名（所谓的加密，目前大部分使用的是md5加密，可能还有SHA），加密过程一般都是在我们的服务器 上进行
B、支付宝微信服务器收到支付订单
加密之后我们都会使用post（get）向支付宝微信服务器发起一请求
C、支付宝微信服务器验证订单的合法性，扣钱，通知我们的服务器
接受到数据后会对我们提交的数据进行验证，所有支付开发不能再局域网中进行测试（推荐一个工具ngrok，不过国内被强，可以使用https://natapp.cn/），同样退款的也是一样的，但是退款需要的还更多，后面我们会单独说明
D、接受到支付宝微信服务器通知，验证消息的合法性，业务处理
接受到通知我们要对数据进行解密验证合法性（在这个步骤很多人为了省事情，把验证环节省了，这个可能会出现模拟支付成功消息，这样会造成问题）
E、发通知告诉支付宝微信服务器收到支付成功消息
F、退款，如果有涉及
现在我们对上面的支付过程进行抽象一下，发现支付的基本流程很相似，我们把其业务抽象出来
1、获取发起订单的参数（id是订单号）
public abstract Map<String, Object> getParameterMap(String id, HttpServletRequest request);2、订单合法性验证
public abstract boolean verifyNotify(String id, HttpServletRequest request);3、通知支付吧微信服务器支付成功消息收到
public abstract String getNotifyMessage(String id, HttpServletRequest request);4、编码方式
public abstract String getRequestCharset();5、关于签名方法我思考了很久是否放在抽象类中,后面还觉得不放进来（因为和支付的业务流程没多少关系），我会将其放在工具类中
好的那么现在我们就抽象出一个支付的流程类（PaymentPlugin）
package test;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
public abstract class PaymentPlugin {
public enum NotifyMethod {
/** 同步 */
sync,
/** 异步 */
async
}
/**
* 1、获取发起订单的参数（id是订单号）
*/
public abstract Map<String, Object> getParameterMap(String id, HttpServletRequest request);
/**
* 2、订单合法性验证
*/
public abstract boolean verifyNotify(String id, HttpServletRequest request);
/**
* 3、通知支付吧微信服务器支付成功消息收到
*/
public abstract String getNotifyMessage(NotifyMethod notifyMethod, HttpServletRequest request);
/**
* 4、编码方式
*/
public abstract String getRequestCharset();
}
下面我们先来说说支付宝支付
支付宝支付有银行支付、支付宝双接口（即时到账支付、担保支付）、移动支付等几种，原来上基本一致，只是在签名和参与签名的参数上有细微的差别，我们在这儿就不过多深究，我们以支付宝双接口为例子
具体的参数要求我就不过多去说明，请参考支付宝的API
1、为了方便我会模拟一个订单类（一般是存库的），大家可以结合物业自行处理
public class Payment {
private String id;
private Type type;
private BigDecimal amount;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Type getType() {
return type;
}
public void setType(Type type) {
this.type = type;
}
public BigDecimal getAmount() {
return amount;
}
public void setAmount(BigDecimal amount) {
this.amount = amount;
}
}
2、为了方便获取支付时需要用到的支付宝、微信给的参数（什么appid、partner的）我们新建一个类（一般也是存库方便修改，我们就模拟一下）
public class PluginConfig {
private Map<String, String> attributes = new HashMap<String, String>();
public Map<String, String> getAttributes() {
return attributes;
}
public void setAttributes(Map<String, String> attributes) {
this.attributes = attributes;
}
}
public class AlipayDualPlugin extends PaymentPlugin{
protected Payment getPayment(String id) {
//模拟查库过程
Payment payment = new Payment();
payment.setId("1");
payment.setAmount(new BigDecimal("0.01"));
return payment;
}
protected PluginConfig getPluginConfig() {
//模拟获取支付所需的参数
PluginConfig pluginConfig = new PluginConfig();
return pluginConfig;
}
//获取回调地址
protected String getNotifyUrl(String id, NotifyMethod notify) {
if (notify==NotifyMethod.sync) {
//返回订单地址
return "http://XXXXX.com/oder/" + id ;
}
//返回回调地址
return "http://XXXXX.com/payment/notify/" + id ;
}
@Override
public Map<String, Object> getParameterMap(String id,
HttpServletRequest request) {
Payment payment = getPayment(id);
PluginConfig pluginConfig = getPluginConfig();
Map<String, Object> parameterMap = new HashMap<String, Object>();
parameterMap.put("service", "trade_create_by_buyer");
parameterMap.put("partner", pluginConfig.getAttributes().get("partner"));
parameterMap.put("_input_charset", "utf-8");
parameterMap.put("sign_type", "MD5");
//支付成功之后同步跳转的页面（一般跳转到订单页面）
parameterMap.put("return_url", getNotifyUrl(id, NotifyMethod.sync));
//支付成功之后支付宝服务器调用地址
parameterMap.put("notify_url", getNotifyUrl(id, NotifyMethod.async));
parameterMap.put("out_trade_no", id);
parameterMap.put("subject", "");
parameterMap.put("body", "");
parameterMap.put("payment_type", "1");
parameterMap.put("logistics_type", "EXPRESS");
parameterMap.put("logistics_fee", "0");
parameterMap.put("logistics_payment", "SELLER_PAY");
parameterMap.put("price", payment.getAmount().setScale(2).toString());
parameterMap.put("quantity", "1");
parameterMap.put("seller_id", pluginConfig.getAttributes().get("partner"));
parameterMap.put("total_fee", payment.getAmount().setScale(2).toString());
parameterMap.put("show_url", "");
parameterMap.put("paymethod", "directPay");
parameterMap.put("exter_invoke_ip", request.getLocalAddr());
parameterMap.put("extra_common_param", "shopxx");
parameterMap.put("sign", generateSign(parameterMap));
return parameterMap;
}
//签名工具
private String generateSign(Map<String, ?> parameterMap) {
PluginConfig pluginConfig = getPluginConfig();
return DigestUtils.md5Hex(joinKeyValue(new TreeMap<String, Object>(parameterMap), null, pluginConfig.getAttributes().get("key"), "&", true, "sign_type", "sign"));
}
protected String joinKeyValue(Map<String, Object> map, String prefix, String suffix, String separator, boolean ignoreEmptyValue, String... ignoreKeys) {
List<String> list = new ArrayList<String>();
if (map != null) {
for (Entry<String, Object> entry : map.entrySet()) {
String key = entry.getKey();
String value = ConvertUtils.convert(entry.getValue());
if (StringUtils.isNotEmpty(key) && !ArrayUtils.contains(ignoreKeys, key) && (!ignoreEmptyValue || StringUtils.isNotEmpty(value))) {
list.add(key + "=" + (value != null ? value : ""));
}
}
}
return (prefix != null ? prefix : "") + StringUtils.join(list, separator) + (suffix != null ? suffix : "");
}
@Override
public boolean verifyNotify(String id, HttpServletRequest request) {
PluginConfig pluginConfig = getPluginConfig();
Payment payment = getPayment(id);
if (generateSign(request.getParameterMap()).equals(request.getParameter("sign")) && pluginConfig.getAttributes().get("partner").equals(request.getParameter("seller_id")) && id.equals(request.getParameter("out_trade_no"))
&& ("WAIT_SELLER_SEND_GOODS".equals(request.getParameter("trade_status")) || "TRADE_SUCCESS".equals(request.getParameter("trade_status")) || "TRADE_FINISHED".equals(request.getParameter("trade_status"))) && payment.getAmount().compareTo(new BigDecimal(request.getParameter("total_fee"))) == 0) {
Map<String, Object> parameterMap = new HashMap<String, Object>();
parameterMap.put("service", "notify_verify");
parameterMap.put("partner", pluginConfig.getAttributes().get("partner"));
parameterMap.put("notify_id", request.getParameter("notify_id"));
if ("true".equals(post("https://mapi.alipay.com/gateway.do", parameterMap))) {
return true;
}
}
return false;
}
protected String post(String url, Map<String, Object> parameterMap) {
Assert.hasText(url);
String result = null;
HttpClient httpClient = new DefaultHttpClient();
try {
HttpPost httpPost = new HttpPost(url);
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
if (parameterMap != null) {
for (Entry<String, Object> entry : parameterMap.entrySet()) {
String name = entry.getKey();
String value = ConvertUtils.convert(entry.getValue());
if (StringUtils.isNotEmpty(name)) {
nameValuePairs.add(new BasicNameValuePair(name, value));
}
}
}
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
result = EntityUtils.toString(httpEntity);
EntityUtils.consume(httpEntity);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
httpClient.getConnectionManager().shutdown();
}
return result;
}
@Override
public String getNotifyMessage(NotifyMethod notifyMethod, HttpServletRequest request) {
if (notifyMethod == NotifyMethod.async) {
return "success";
}
return null;
}
@Override
public String getRequestCharset() {
return "UTF-8";
}
}
接下来我们说一下微信支付，同样的微信支付也有很多种，公众号支付、扫码支付（web端和线下支付）、app支付等，下面我为与公众号支付为例
public class WeixinPayPlugin extends PaymentPlugin{
protected Payment getPayment(String id) {
//模拟查库过程
Payment payment = new Payment();
payment.setId("1");
payment.setAmount(new BigDecimal("0.01"));
return payment;
}
protected static PluginConfig getPluginConfig() {
//模拟获取支付所需的参数
PluginConfig pluginConfig = new PluginConfig();
return pluginConfig;
}
//获取回调地址
protected String getNotifyUrl(String id, NotifyMethod notify) {
if (notify==NotifyMethod.sync) {
//返回订单地址
return "http://XXXXX.com/oder/" + id ;
}
//返回回调地址
return "http://XXXXX.com/payment/notify/" + id ;
}
@Override
public Map<String, Object> getParameterMap(String id,
HttpServletRequest request) {
Payment payment = getPayment(id);
PluginConfig pluginConfig = getPluginConfig();
SortedMap<String, Object> parameterMap = new TreeMap<String, Object>();
parameterMap.put("appid", pluginConfig.getAttributes().get("appid"));
parameterMap.put("mch_id",pluginConfig.getAttributes().get("mch_id"));
parameterMap.put("nonce_str", getRandomString(32));
parameterMap.put("body","");
parameterMap.put("out_trade_no", id);
parameterMap.put("fee_type", "CNY");
BigDecimal total = payment.getAmount().multiply(new BigDecimal(100));
java.text.DecimalFormat df=new java.text.DecimalFormat("0");
parameterMap.put("total_fee", df.format(total));
parameterMap.put("spbill_create_ip", request.getLocalAddr());
parameterMap.put("notify_url", getNotifyUrl(id, NotifyMethod.async));
parameterMap.put("trade_type", "NATIVE");
parameterMap.put("product_id","");
String sign = createSign("UTF-8", parameterMap);
parameterMap.put("sign", sign);
String requestXML = getRequestXml(parameterMap);
String result = httpsRequest(
"https://api.mch.weixin.qq.com/pay/unifiedorder", "POST",
requestXML);
Map<String, Object> map = null;
try {
map = doXMLParse(result);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return map;
}
@Override
public boolean verifyNotify(String id, HttpServletRequest request) {
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 = doXMLParse(result);
if (map.get("result_code").toString().equalsIgnoreCase("SUCCESS")) {
SortedMap<String, Object> parameterMap = new TreeMap<String, Object>();
String sign = (String) map.get("sign");
for (Object keyValue : map.keySet()) {
if(!keyValue.toString().equals("sign")){
parameterMap.put(keyValue.toString(), map.get(keyValue));
}
}
String createSign = createSign("UTF-8", parameterMap);
if(createSign.equals(sign)){
return true;
}else{
return false;
}
}
return false;
}
@Override
public String getNotifyMessage(NotifyMethod notifyMethod,
HttpServletRequest request) {
if (notifyMethod == NotifyMethod.async) {
return "success";
}
return null;
}
@Override
public String getRequestCharset() {
return "UTF-8";
}
//随机字符串生成
public static String getRandomString(int length) { //length表示生成字符串的长度
String base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int number = random.nextInt(base.length());
sb.append(base.charAt(number));
}
return sb.toString();
}
//请求xml组装
public static String getRequestXml(SortedMap<String,Object> parameters){
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set es = parameters.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String key = (String)entry.getKey();
String value = (String)entry.getValue();
if ("attach".equalsIgnoreCase(key)||"body".equalsIgnoreCase(key)||"sign".equalsIgnoreCase(key)) {
sb.append("<"+key+">"+"<![CDATA["+value+"]]></"+key+">");
}else {
sb.append("<"+key+">"+value+"</"+key+">");
}
}
sb.append("</xml>");
return sb.toString();
}
//生成签名
public static String createSign(String characterEncoding,SortedMap<String,Object> parameters){
PluginConfig pluginConfig = getPluginConfig();
StringBuffer sb = new StringBuffer();
Set es = parameters.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
Object v = entry.getValue();
if(null != v && !"".equals(v)
&& !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + pluginConfig.getAttributes().get("appid"));
String sign = MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
//请求方法
public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {
try {
URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);
conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
// 当outputStr不为null时向输出流写数据
if (null != outputStr) {
OutputStream outputStream = conn.getOutputStream();
// 注意编码格式
outputStream.write(outputStr.getBytes("UTF-8"));
outputStream.close();
}
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
return buffer.toString();
} catch (ConnectException ce) {
System.out.println("连接超时：{}"+ ce);
} catch (Exception e) {
System.out.println("https请求异常：{}"+ e);
}
return null;
}
//退款的请求方法
public static String httpsRequest2(String requestUrl, String requestMethod, String outputStr,String PaymentPluginId) throws Exception {
KeyStore keyStore = KeyStore.getInstance("PKCS12");
StringBuilder res = new StringBuilder("");
SSLContext sslcontext=null;
if(PaymentPluginId.equals("weixinAppPay")){
FileInputStream instream = new FileInputStream(new File("/home/apiclient_cert.p12"));
try {
keyStore.load(instream, "13XXXXXXXX".toCharArray());
} finally {
instream.close();
}
sslcontext = SSLContexts.custom()
.loadKeyMaterial(keyStore, "13XXXXXXXXX".toCharArray())
.build();
}else{
FileInputStream instream = new FileInputStream(new File("/home/apiclient_cert2.p12"));
try {
keyStore.load(instream, "1XXXXXXXXXX".toCharArray());
} finally {
instream.close();
}
sslcontext = SSLContexts.custom()
.loadKeyMaterial(keyStore, "1XXXXXXXXXXXX".toCharArray())
.build();
}
// Trust own CA and all self-signed certs
// Allow TLSv1 protocol only
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
sslcontext,
new String[] { "TLSv1" },
null,
SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
CloseableHttpClient httpclient = HttpClients.custom()
.setSSLSocketFactory(sslsf)
.build();
try {
HttpPost httpost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund");
httpost.addHeader("Connection", "keep-alive");
httpost.addHeader("Accept", "*/*");
httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
httpost.addHeader("Host", "api.mch.weixin.qq.com");
httpost.addHeader("X-Requested-With", "XMLHttpRequest");
httpost.addHeader("Cache-Control", "max-age=0");
httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");
StringEntity entity2 = new StringEntity(outputStr ,Consts.UTF_8);
httpost.setEntity(entity2);
CloseableHttpResponse response = httpclient.execute(httpost);
try {
HttpEntity entity = response.getEntity();
if (entity != null) {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent()));
String text;
while ((text = bufferedReader.readLine()) != null) {
res.append(text);
}
}
EntityUtils.consume(entity);
} finally {
response.close();
}
} finally {
httpclient.close();
}
return res.toString();
}
//xml解析
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 = getChildrenText(children);
}
m.put(k, v);
}
//关闭流
in.close();
return m;
}
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(getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
}
return sb.toString();
}
public static String setXML(String return_code, String return_msg) {
return "<xml><return_code><![CDATA[" + return_code
+ "]]></return_code><return_msg><![CDATA[" + return_msg
+ "]]></return_msg></xml>";
}
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();
}
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];
}
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" };
}
主要的方法都包含在上面了，这个代码是扣出来的，未进行验证，但是获取参数、微信的预支付、回调的验证方法是一定正确的，包括微信支付的退款（这里强调一下，需要去微信支付官网下载证书，Java的需要p12）支付宝退款就不整理，直接贴一下
public Map<String, Object> getRefundParameterMap(Long id, HttpServletRequest request) {
Map<String, Object> refundParameterMap = new HashMap<String, Object>();
refundParameterMap.put("service", "refund_fastpay_by_platform_pwd");
refundParameterMap.put("partner", "");
refundParameterMap.put("_input_charset", "utf-8");
refundParameterMap.put("sign_type", "MD5");
refundParameterMap.put("notify_url", "");
refundParameterMap.put("seller_email", ".com");
refundParameterMap.put("seller_id", "");
refundParameterMap.put("refund_date", DateUtils.format(new Date(), DateUtils.FORMAT_LONG));
refundParameterMap.put("batch_no", DateUtils.format(new Date(), DateUtils.FORMAT_DATE)+ refunds.getSn());
refundParameterMap.put("batch_num", "1");
refundParameterMap.put("detail_data", generateDetailData(refunds));
refundParameterMap.put("sign", generateSign(refundParameterMap));
return refundParameterMap;
}
private String generateDetailData(Refunds refunds) {
Set<Payment> paymentSet = refunds.getOrder().getPayments();
List<Payment> paymentList = new ArrayList<Payment>(paymentSet);
Payment payment = null;
if(null!=paymentList){
payment=paymentList.get(0);
}
StringBuffer data = new StringBuffer();
data.append(payment.getTradeNo());
data.append("^");
java.text.DecimalFormat df=new java.text.DecimalFormat("0.00");
data.append(df.format(refunds.getAmount()));
data.append("^");
data.append("协商退款");
return data.toString();
}public boolean verifyNotify(HttpServletRequest request){
if (generateSign(request.getParameterMap()).equals(request.getParameter("sign"))) {
Map<String, Object> parameterMap = new HashMap<String, Object>();
parameterMap.put("service", "notify_verify");
parameterMap.put("partner", "2088311389671021");
parameterMap.put("notify_id", request.getParameter("notify_id"));
if ("true".equals(post("https://mapi.alipay.com/gateway.do", parameterMap))) {
return true;
}
}
return false;
}
退款方法也可以方法接口中，刚开始考虑不周全，大家可以补一下
package test;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
public abstract class PaymentPlugin {
public enum NotifyMethod {
/** 同步 */
sync,
/** 异步 */
async
}
/**
* 1、获取发起订单的参数（id是订单号）
*/
public abstract Map<String, Object> getParameterMap(String id, HttpServletRequest request);
/**
* 2、订单合法性验证
*/
public abstract boolean verifyNotify(String id, HttpServletRequest request);
/**
* 3、通知支付吧微信服务器支付成功消息收到
*/
public abstract String getNotifyMessage(NotifyMethod notifyMethod, HttpServletRequest request);
/**
* 4、编码方式
*/
public abstract String getRequestCharset();
/**
*
*退款接口
*/
public abstract Map<String, Object> getRefundParameterMap (String id, HttpServletRequest request);
}
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