相信你也是看了好多了，基本的就不说了，说下重点，微信公众号支付一共需要11参数
1. appid APPID （已有）
2. mch_id 商户ID （已有）
3. nonce_str 随机字符串
4. sign 签名 特别注意签名是有剩下的10个参数生成的
5. body 所支付的名称
6. out_trade_no 咱们自己所提供的订单号,需要唯一
7. total_fee 支付金额
8. spbill_create_ip IP地址
9. notify_url 回调地址
10. trade_type 支付类型
11. openid 支付人的微信公众号对应的唯一标识
sign签名参数需要用其他10个参数加上key（微信支付秘钥），利用这11个参数调用微信https://api.mch.weixin.qq.com/pay/unifiedorder 统一下单接口，HttpRequest.sendPost(unifiedorder_url, xml)方法获取到prepay_id 获取不到prepay_id支付是不会成功，以下代码复制基本就可以使用
来上代码
public Map pay(HttpServletRequest request, HttpServletResponse response, Model model) {
Map preData=new HashMap();
Map<String, String> payMap = new HashMap<String, String>();
try {
WsMember member=WsUtils.getMember(request, response);
WxAccount account=WsUtils.getAccount();
preData.put("appid", account.getAccountAppid());//
System.out.println("account.getAccountAppid()================================="+account.getAccountAppid());
preData.put("mch_id", account.getMchId());//
preData.put("nonce_str", WXPayUtil.generateNonceStr());//就是一个随机字符串
preData.put("body", "1223");//
preData.put("out_trade_no", "201801300002");//订单号，自己生成
preData.put("fee_type", "CNY");//
preData.put("total_fee", "1");//付款金额 单位分
preData.put("spbill_create_ip", request.getLocalAddr());//
preData.put("notify_url", "http://www。baidu.com/");//
preData.put("trade_type", "JSAPI"); //支付类型 公众号支付用JSAPI
preData.put("openid", member.getOpenId());//支付用户的openID 微信唯一标识
String sign = WXPayUtil.generateSignature(preData, account.getPayKey());//最重要的签名生成用10个参数的map集合和32位支付key生成
System.out.println(account.getPayKey());
System.out.println("sign==================="+sign);
preData.put("sign", sign);//
String xml = WXPayUtil.mapToXml( preData);//将所有参数(map)转xml格式
System.out.println(xml);
//UnifiedOrderRespose orderResponse = WXPayUtil.httpOrder(xml);
// 统一下单 https://api.mch.weixin.qq.com/pay/unifiedorder
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
String prepay_id = "";//预支付id
System.out.println(xmlStr);
if (xmlStr.indexOf("SUCCESS") != -1) {
Map<String, String> map = WXPayUtil.xmlToMap(xmlStr);
prepay_id = (String) map.get("prepay_id");
}
payMap.put("appId", account.getAccountAppid());
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, account.getPayKey());
payMap.put("paySign", paySign);
payMap.put("ret","1");
return payMap;
} catch (Exception e) {
payMap.put("ret",InterConstant.RET_WX);
payMap.put("appid",WsUtils.getAccount().getAccountAppid());
}
return payMap;
}注意
body参数如果套用汉字使用前必须转码
上述完成后还没有生成prepay_id需要检查参数
以下是工具类
HttpRequest 网上有好多基本上都可以使用
WXPayUtil微信提供的就可以
public class HttpRequest {
/**
* 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;
}
}public class WXPayUtil {
/**
* 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>();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.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 {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder= documentBuilderFactory.newDocumentBuilder();
org.w3c.dom.Document document = documentBuilder.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.HMACSHA256);
}
/**
* 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() {
return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}
/**
* 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();
}
/**
* 生成 uuid， 即用来标识一笔单，也用做 nonce_str
* @return
*/
public static String generateUUID() {
return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}
}前台页面
前台我使用是vue框架
var appId,timeStamp,nonceStr,package,signType,paySign,sn;
function pay(){
//alert(123)
var zifei=$("#zifei").text();
//alert(zifei)
mui.ajax(wxshop.serverUrl+"/zhifu/pay", {
type: "post",
data: {
zifei:zifei,
memid:wxshop.getUrlParam("id"),
},
dataType: "json",
success: function(data) {
//alert(data.package)
if(data.ret==0){
mui.alert(data.msg);
}
if(data.ret==2){
wxshop.getOpenId(data.appid);
}
if(data.ret==1){
appId=data.appId;
timeStamp=data.timeStamp;
nonceStr=data.nonceStr;
signType=data.signType;
paySign=data.paySign;
package=data.package;
sn=data.sn;
alert(data.sn)
//alert(data.package)
callpay();
}
},
error: function(xhr,type,errorThrown) {
mui.alert("后台接口请求失败，请联系管理员！错误"+errorThrown);
}
});
}
function onBridgeReady(){
//alert(package)
WeixinJSBridge.invoke( 'getBrandWCPayRequest', {
"appId":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');
//支付成功后跳转的页面
}else if(res.err_msg == "get_brand_wcpay_request:cancel"){
console.log('支付取消');
}else if(res.err_msg == "get_brand_wcpay_request:fail"){
console.log('支付失败');
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。
});
}
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