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相信很多的码友在项目中都需要接入微信支付，虽说微信支付已成为一个普遍的现象，但是接入的过程中难免会遇到各种各样的坑，这一点支付宝的SDK就做的很好，已经完成的都知道了。

下面就开始我们的代码之旅，这里我将给大家提供两种支付一个是微信公众号支付，一个是APP微信支付。

一 微信公众号支付

流程：

1.获取用户openid

2.获取token，注意获取的token是有时效的而且接口是有获取上线，具体看微信API文档

3.拿商品信息（金额，名字等）去请求统一下单接口

4.统一下单接口获取预支付ID，后进行二次签名把参数返回给前端

5.前端JS中接收到参数调起支付

6.支付成功页面跳转以及回调处理

下面我们就来具体说说功能

GetOpenId：获取用户openid

public class GetOpenid extends HttpServlet {private static final Logger logger = Logger.getLogger(GetOpenid.class);@SuppressWarnings("unused")public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=UTF-8");HttpSession session = request.getSession();PreparedStatement pst=null;String username="";//获取codeString appid=WeiXinUitls.appid;String code = request.getParameter("code");String rturl = request.getParameter("rturl");String appsecret = WeiXinUitls.appsecret;String grant_type = "authorization_code";String returnJSON = HttpTool.getToken(appid, appsecret, grant_type,code);JSONObject obj = JSONObject.fromObject(returnJSON);if(!(obj==null)){String openid = obj.get("openid").toString();String token = obj.get("access_token").toString();String retoken = obj.get("refresh_token").toString();//获取微信用户String getuserinfo = HttpTool.getuserinfo(token, openid);JSONObject fromObject = JSONObject.fromObject(getuserinfo);String stropenid = fromObject.get("openid").toString();session.setAttribute("openid", stropenid);String strnickname = fromObject.get("nickname").toString();String strcity = fromObject.get("city").toString();String strcountry = fromObject.get("country").toString();String strprovince = fromObject.get("province").toString();String strsex = fromObject.get("sex").toString();}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}public static String RmFilter(String message){if ((message == null) || (message.equals(""))) {message = "";}message = message.replace("<",""); message = message.replace(">",""); message = message.replace("'","");message = message.replace("\"","");//message = message.replace("/","/");message = message.replace("%",""); message = message.replace(";",""); message = message.replace("(",""); message = message.replace(")",""); message = message.replace("&",""); message = message.replace("+","_"); return message;}}

RefTicket：获取ticket

public class RefTicket extends TimerTask{private static ServletContext application = null;public RefTicket(ServletContext application){this.application = application;}public void run() {String jsapi_ticket = getTicket();if(!"".equalsIgnoreCase(jsapi_ticket)){this.application.setAttribute("jsapi_ticket", jsapi_ticket);System.out.println("jsapi_ticket:"+jsapi_ticket);System.out.println("jsapi_ticket--application:"+this.application.getAttribute("jsapi_ticket"));}}private static DefaultHttpClient httpclient;static {httpclient = new DefaultHttpClient();httpclient = (DefaultHttpClient) HttpClientConnectionManager.getSSLInstance(httpclient);}private String getTicket(){String token = (String) this.application.getAttribute("token");if("".equalsIgnoreCase(token) || null ==  token ){return "";}HttpGet get = HttpClientConnectionManager.getGetMethod("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+token+"&type=jsapi");HttpResponse response;try {response = httpclient.execute(get);String jsonStr = EntityUtils.toString(response.getEntity(), "utf-8");JSONObject demoJson = JSONObject.fromObject(jsonStr);return demoJson.getString("ticket");} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (JSONException e) {e.printStackTrace();}return "";}}

RefToken：获取token

public class RefToken extends TimerTask{private  final static String appId = "wx842b838875cd9bd3";private final static String appSecret = "ce7948b66d04b5ae714c9d0e4bc6eba9";private static ServletContext application = null;public RefToken(ServletContext application){this.application = application;}public void run() {String token = getAccessToken(appId,appSecret);if(!"".equalsIgnoreCase(token)){this.application.setAttribute("token", token);System.out.println("token---init:"+token);String ticket = getTicket();this.application.setAttribute("jsapi_ticket", ticket);System.out.println("ticket--init:"+ticket);}}private static DefaultHttpClient httpclient;static {httpclient = new DefaultHttpClient();httpclient = (DefaultHttpClient) HttpClientConnectionManager.getSSLInstance(httpclient);}private static String getAccessToken(String appid, String secret) {HttpGet get = HttpClientConnectionManager.getGetMethod("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+ appid + "&secret=" + secret);HttpResponse response;try {response = httpclient.execute(get);String jsonStr = EntityUtils.toString(response.getEntity(), "utf-8");JSONObject demoJson = JSONObject.fromObject(jsonStr);return demoJson.getString("access_token");} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (JSONException e) {e.printStackTrace();}return "";}private String getTicket(){String token = (String) this.application.getAttribute("token");if("".equalsIgnoreCase(token) || null ==  token ){return "";}HttpGet get = HttpClientConnectionManager.getGetMethod("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+token+"&type=jsapi");HttpResponse response;try {response = httpclient.execute(get);String jsonStr = EntityUtils.toString(response.getEntity(), "utf-8");JSONObject demoJson = JSONObject.fromObject(jsonStr);return demoJson.getString("ticket");} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (JSONException e) {e.printStackTrace();}return "";}}

GetSignature ：

public class GetSignature extends HttpServlet {private static final long serialVersionUID = 1L;private static final Logger logger = Logger.getLogger(GetSignature.class);public GetSignature() {super();}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {}protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {try{response.setCharacterEncoding("UTF-8");request.setCharacterEncoding("UTF-8");PrintWriter out = response.getWriter();//你的支付目录的Url,不需要转义，不包含#及其后面部分String url = request.getParameter("url");ServletContext application = this.getServletContext();String jsapi_ticket=String.valueOf(application.getAttribute("jsapi_ticket"));JSONObject obj = WeixinPay.getSignature(url, jsapi_ticket);
//			Map sign = Sign.sign(jsapi_ticket,url);out.print(obj.toString());out.flush();out.close();}catch (Exception e) {logger.error(e.getMessage(), e);e.printStackTrace();}}}

JS中初始化：

//支付初始化function initPay(openId){//获取当前页面URLvar geturl=window.location.href.split('#')[0];var getencodeurl=encodeURIComponent(geturl);$.ajax({type : 'POST',url : "/GetSignature?url="+getencodeurl,contentType:"application/x-www-form-urlencoded", success : function(response) {var params = eval("(" + response + ")");wx.config({debug: false,appId : params.appid, // 必填，公众号的唯一标识timestamp : params.timestamp, // 必填，生成签名的时间戳nonceStr : params.nonceStr,  // 必填，生成签名的随机串signature : params.signature,// 必填，签名，见附录1jsApiList : [ 'chooseWXPay']});wx.ready(function() {// config信息验证后会执行ready方法，所有接口调用都必须在config接口获得结果之后，config是一个客户端的异步操作，所以如果需要在页面加载时就调用相关接口，则须把相关接口放在ready函数中调用来确保正确执行。对于用户触发时才调用的接口，则可以直接调用，不需要放在ready函数中。$("#weixinpay").on('click', function(t) {
// 							var c_sname =getQueryString("c_sname");var paymoney=document.getElementById("money").value;//实际付款var phone=document.getElementById("phone").value;//手机号if(phone==null||phone==""){Dialog.alert("请填写手机号码!");}else{$("#weixinpay").unbind('click');$("#mcover").css("display","block"); 
// 								alert($("#payment").serialize());$.ajax({type : 'POST',
// 									url:"/topayServlet",url : "/topayServlet?openId="+openId+"&money="+paymoney+"&phone="+phone,
// 									data:$("#payment").serialize(),// 提交formid
// 									async: false,success : function(response) {var params = eval("(" + response + ")");$("#mcover").css("display","none");wx.chooseWXPay({appId : params.appId,timestamp :params.timeStamp, // 支付签名时间戳，注意微信jssdk中的所有使用timestamp字段均为小写。但最新版的支付后台生成签名使用的timeStamp字段名需大写其中的S字符nonceStr  : params.nonceStr, // 支付签名随机串，不长于 32 位package : params.package, // 统一支付接口返回的prepay_id参数值，提交格式如：prepay_id=***）signType :params.signType, paySign : params.paySign, success : function(res) {if(res.errMsg == "chooseWXPay:ok" ) {window.location.href="/3g/shareBusiness.jsp?sid="+sp+"&c_sname="+skf+"&phone="+phone;//支付成功$("#weixinpay").bind('click');}},cancel: function (res) { window.location.href="/3g/shop_list.jsp";$("#weixinpay").bind('click');},fail:function(res){window.location.href="/3g/shop_list.jsp";$("#weixinpay").bind('click');}});},error : function() {
// 										window.location.reload();
// 										alert("服务器异常，统一下单接口出错!");}})}});});// config信息验证失败会执行error函数，如签名过期导致验证失败，具体错误信息可以打开config的debug模式查看，也可以在返回的res参数中查看，对于SPA可以在这里更新签名。
// 					wx.error(function(res){
// 						alert('wx.error: '+JSON.stringify(res));
// 					});},error : function() {
// 					window.location.reload();
// 					Dialog.alert("服务器异常，支付初始化失败！");}})}

TopayServlet：统一下单接口

/*** 支付请求处理* @author dsn**/
public class TopayServlet extends HttpServlet {/*** */private static final long serialVersionUID = 1359159929707330023L;private static final Logger logger = Logger.getLogger(TopayServlet.class);private String finalmoney=null;private String createOrderURL = "https://api.mch.weixin.qq.com/pay/unifiedorder";//商户相关资料 private	String appid = WeiXinUitls.appid;private	String appsecret = WeiXinUitls.appsecret;private	String partner = WeiXinUitls.partner;private	String partnerkey = WeiXinUitls.partnerkey;@SuppressWarnings("static-access")public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setCharacterEncoding("UTF-8");request.setCharacterEncoding("UTF-8");PrintWriter out = response.getWriter();//网页授权后获取传递的参数String openId = request.getParameter("openId"); 	String sid = request.getParameter("sssp"); //商户IDString money = request.getParameter("money");//实际付款String phone = request.getParameter("phone");//手机号String c_sname = new String(skf.getBytes("ISO-8859-1"), "utf-8");//拼接字符串String zong=sid+"*"+money+"*"+phone+"*"+jfdy;//金额转化为分为单位String money2 = TenpayUtil.getMoney(money);//获取openId后调用统一支付接口https://api.mch.weixin.qq.com/pay/unifiedorderString currTime = TenpayUtil.getCurrTime();//8位日期String strTime = currTime.substring(8, currTime.length());//四位随机数String strRandom = TenpayUtil.buildRandom(4) + "";//10位序列号,可以自行调整。String strReq = strTime + strRandom;//商户号String mch_id = partner;//子商户号  非必输//String sub_mch_id="";//设备号   非必输String device_info="WEB";//随机数 String nonce_str = strReq;//商品描述//String body = describe;//商品描述根据情况修改String body = c_sname;//附加数据String attach = zong;//商户订单号String out_trade_no = NonceString.generate();//int intMoney = Integer.parseInt(finalmoney);//总金额以分为单位，不带小数点//int total_fee = intMoney;//订单生成的机器 IPString spbill_create_ip = request.getRemoteAddr();//订 单 生 成 时 间   非必输String time_start =TenpayUtil.getStartTime();//订单失效时间      非必输String time_expire =TenpayUtil.getEndTime();;//商品标记   非必输String goods_tag = "WXG";//这里notify_url是 支付完成后微信发给该链接信息，可以判断会员是否支付成功，改变订单状态等。String notify_url ="http://www.yiquanmian.com/notifyServlet";String trade_type = "JSAPI";String openid = openId;//非必输
//				String product_id = "";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("attach", attach);  packageParams.put("out_trade_no", out_trade_no);  packageParams.put("total_fee", money2);  packageParams.put("spbill_create_ip", spbill_create_ip);packageParams.put("time_start", time_start); packageParams.put("time_expire", time_expire); packageParams.put("notify_url", notify_url);  packageParams.put("trade_type", trade_type);  packageParams.put("openid", openid);  RequestHandler reqHandler = new RequestHandler(request, response);reqHandler.init(appid, appsecret, partnerkey);String sign = reqHandler.createSign(packageParams);String xml=""+""+appid+""+""+mch_id+""+""+nonce_str+""+""+sign+""+""+""+attach+""+""+out_trade_no+""+""+money2+""+""+spbill_create_ip+""+""+time_start+""+""+time_expire+""+""+notify_url+""+""+trade_type+""+""+openid+""+"";String allParameters = "";try {allParameters =  reqHandler.genPackage(packageParams);} catch (Exception e) {logger.error(e.getMessage(), e);e.printStackTrace();}String prepay_id="";try {prepay_id= new GetWxOrderno().getPayNo(createOrderURL, xml);
//					JSONObject xmls = p.getJSONObject("xml");if(prepay_id.equals("")){request.setAttribute("ErrorMsg", "统一支付接口获取预支付订单出错");response.sendRedirect("error.jsp");}} catch (Exception e1) {logger.error(e1.getMessage(), e1);e1.printStackTrace();}SortedMap finalpackage = new TreeMap();String appid2 = appid;String timestamp = Sha1Util.getTimeStamp();String nonceStr2 = nonce_str;String prepay_id2 = "prepay_id="+prepay_id;String packages = prepay_id2;finalpackage.put("appId", appid2);  finalpackage.put("timeStamp", timestamp);  finalpackage.put("nonceStr", nonceStr2);  finalpackage.put("package", packages);  finalpackage.put("signType", "MD5");String finalsign = reqHandler.createSign(finalpackage);finalpackage.put("paySign",finalsign);JSONObject jsonObject1 = JSONObject.fromObject(finalpackage);   out.print(jsonObject1);out.flush();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

NotifyServlet：回调处理类

public class NotifyServlet extends HttpServlet {/*** */private static final long serialVersionUID = 6743167121907086323L;private static final Logger logger = Logger.getLogger(NotifyServlet.class);private String resultXML;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
//		response.setContentType("text/html;charset=utf-8");HttpSession session = request.getSession();int i = 0;//String inputLine;String notityXml = "";String resXml = "";try {while ((inputLine = request.getReader().readLine()) != null) {notityXml += inputLine;}request.getReader().close();} catch (Exception e) {e.printStackTrace();}try {Map m = GetWxOrderno.parseXmlToList2(notityXml);WxPayResult wpr = new WxPayResult();String appid = m.get("appid").toString();String bank_type = m.get("bank_type").toString();String attach = m.get("attach").toString();String cash_fee = m.get("cash_fee").toString();String fee_type = m.get("fee_type").toString();String is_subscribe = m.get("is_subscribe").toString();String mch_id = m.get("mch_id").toString();String nonce_str = m.get("nonce_str").toString();String openid = m.get("openid").toString();String out_trade_no = m.get("out_trade_no").toString();String result_code = m.get("result_code").toString();String return_code = m.get("return_code").toString();String sign = m.get("sign").toString();String time_end = m.get("time_end").toString();String times = time_end.substring(0, 4) + "-"+ time_end.substring(4, 6) + "-" + time_end.substring(6, 8)+ " " + time_end.substring(8, 10) + ":"+ time_end.substring(10, 12) + ":"+ time_end.substring(12, 14);Timestamp tstamp = Timestamp.valueOf(times);String total_fee = m.get("total_fee").toString();int totalint = Integer.parseInt(total_fee);double pasint = totalint * 0.01;String trade_type = m.get("trade_type").toString();String transaction_id = m.get("transaction_id").toString();if ("SUCCESS".equals(result_code)) {// 支付成功// 处理附加数据// 判断订单是否已经存在if (rs.next()) {if(transaction_id.equals(rs.getString("ddh"))){System.out.println("订单已经存在");}} else {// ----------------------------------------------------发送短信-------------------------------------------// 给用户发短信// 给商家发短信}resXml = ""+ ""+ "" + " ";} else {resXml = ""+ ""+ ""+ " ";}BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());out.write(resXml.getBytes());out.flush();out.close();} catch (Exception e) {logger.error(e.getMessage(), e);e.printStackTrace();}}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}
}

上面就是微信公众号的核心代码，需要源码的可以去我的地址下

https://download.csdn.net/download/dsn727455218/9325425

重点提示一下一定要在js的页面中引入微信的js文件不然会调不起支付的

二 APP支付

流程：

1.Android引入微信支付的SDK

2.拿商品信息请求统一下单接口

3.统一下单接口获取预支付ID，后进行二次签名把参数返回给前端

4.前端JS中接收到参数调起支付

5.支付成功页面跳转以及回调处理

具体骚操作：

首先在Constants.java中设置相关参数,具体请查看该文件注释，同时根据注释修改androidmanifest.xml文件

要保证： 包名和开放平台一致，签名和开放平台一致，并且再公众平台做设置，详情请阅读: http://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_5,注意：此条仅仅适用于android，ios不受签名文件限制
 

要保证回调类WXPayEntryActivity.java文件必须位于包名的wxapi目录下，否则会导致无法回调的情况，注意：此条仅仅适用于android,ios有固定格式，请参考ios demo

上面是Android的注意事项

androidmanifest.xml：

PayActivity：调起支付类

public class PayActivity extends Activity {private static final String TAG = "MicroMsg.SDKSample.PayActivity";PayReq req;final IWXAPI msgApi = WXAPIFactory.createWXAPI(this, null);TextView show;Map resultunifiedorder;StringBuffer sb;private IWXAPI api; // IWXAPI 是第三方app和微信通信的openapi接口private Context context;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.pay);//微信appIdapi = WXAPIFactory.createWXAPI( this, Constants.APP_ID);api.registerApp(Constants.APP_ID);final Button appayBtn = (Button) findViewById(R.id.appay_btn);appayBtn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String url = "http://192.168.0.104:8080/wx_pay/servlet/TopayServlet";Toast.makeText(PayActivity.this, "获取订单中...", Toast.LENGTH_SHORT).show();try{byte[] buf = Util.httpGet(url);if (buf != null && buf.length > 0) {String content = new String(buf);Log.e("get server pay params:",content);JSONObject json = new JSONObject(content); if(null != json && json.getString("returnstatus").equals("success") ){String retmsg = json.getString("retmsg");JSONObject json2 = new JSONObject(retmsg); PayReq req = new PayReq();//req.appId = "wxf8b4f85f3a794e77";  // 测试用appIdLog.e("get appid  :",json2.getString("appid"));Log.e("get partnerid  :",json2.getString("partnerid"));Log.e("get prepayid  :",json2.getString("prepayid"));Log.e("get noncestr  :",json2.getString("noncestr"));Log.e("get timestamp  :",json2.getString("timestamp"));Log.e("get package  :",json2.getString("package"));Log.e("get sign  :",json2.getString("sign"));//从服务器获取req.appId           = json2.getString("appid");req.partnerId       = json2.getString("partnerid");req.prepayId        = json2.getString("prepayid");req.nonceStr        = json2.getString("noncestr");req.timeStamp       = json2.getString("timestamp");req.packageValue    = json2.getString("package");req.sign            = json2.getString("sign");req.extData         = "app data"; // optionalToast.makeText(PayActivity.this, "正常调起支付", Toast.LENGTH_SHORT).show();// 在支付之前，如果应用没有注册到微信，应该先调用IWXMsg.registerApp将应用注册到微信api.sendReq(req);Log.e("get api.sendReq(req)  :",api.sendReq(req)+"");}else{Log.d("PAY_GET", "返回错误"+json.getString("retmsg"));Toast.makeText(PayActivity.this, "返回错误"+json.getString("retmsg"), Toast.LENGTH_SHORT).show();}}else{Log.d("PAY_GET", "服务器请求错误");Toast.makeText(PayActivity.this, "服务器请求错误", Toast.LENGTH_SHORT).show();}}catch(Exception e){Log.e("PAY_GET", "异常："+e.getMessage());Toast.makeText(PayActivity.this, "异常："+e.getMessage(), Toast.LENGTH_SHORT).show();}
//                appayBtn.setEnabled(true);}});     }

WXPayEntryActivity：支付成功页面跳转类

public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler{private static final String TAG = "MicroMsg.SDKSample.WXPayEntryActivity";private IWXAPI api;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.pay_result);//微信APP_IDapi = WXAPIFactory.createWXAPI(this, Constants.APP_ID);api.handleIntent(getIntent(), this);}@Overrideprotected void onNewIntent(Intent intent) {super.onNewIntent(intent);setIntent(intent);api.handleIntent(intent, this);}@Overridepublic void onReq(BaseReq req) {}@Overridepublic void onResp(BaseResp resp) {Log.d(TAG, "onPayFinish, errCode = " + resp.errCode);String msg = "";if (resp.errCode == 0) {msg = "支付成功";} else if (resp.errCode == -1) {msg = "已取消支付";} else if (resp.errCode == -2) {msg = "支付失败";}Toast.makeText(WXPayEntryActivity.this, resp.errCode+"------"+msg, Toast.LENGTH_SHORT).show();finish();}
}

PrepayId：统一下单接口

/*** Servlet implementation class prepayid*/
public class PrepayId extends HttpServlet {private static final long serialVersionUID = 1L;// key设置路径：微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置//TODOprivate static String KEY = "你的商户平台key";/*** Default constructor.*/public PrepayId() {}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse*      response)*/@SuppressWarnings("rawtypes")protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";SortedMap map = new TreeMap();//TODO 你的appidmap.put("appid", "");//TODO 你的商户idmap.put("mch_id", "");map.put("nonce_str", String.valueOf(System.currentTimeMillis()));map.put("body", "lidongliang");map.put("out_trade_no", String.valueOf(System.currentTimeMillis()));map.put("total_fee", "1");map.put("spbill_create_ip", "192.168.0.105");map.put("notify_url", "你的回调地址");map.put("trade_type", "APP");String sign = createSign(map);map.put("sign", sign);// 生成XMlSet set = map.entrySet();Iterator it = set.iterator();StringBuffer sb = new StringBuffer();sb.append("");while (it.hasNext()) {Map.Entry entry = (Map.Entry) it.next();String key = (String) entry.getKey();String value = (String) entry.getValue();sb.append("<" + key + ">");}sb.append("");try {System.out.println("111111111" + sb.toString());String postData = NetUtil.doPost(url, sb.toString());System.out.println("222222222" + postData.toString());SortedMap test = new TreeMap();JSONObject json = XML.toJSONObject(postData).getJSONObject("xml");test.put("appid", json.getString("appid"));test.put("partnerid", json.getString("mch_id"));test.put("prepayid", json.getString("prepay_id"));test.put("package", "Sign=WXPay");test.put("noncestr", String.valueOf(System.currentTimeMillis()));test.put("timestamp", String.valueOf(System.currentTimeMillis() / 1000));test.put("sign", createSign(test));response.getWriter().append(new JSONObject(test).toString());} catch (Exception e) {e.printStackTrace();}}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse*      response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}/*** 微信支付签名算法sign* * @param characterEncoding* @param parameters* @return*/@SuppressWarnings("rawtypes")public static String createSign(SortedMap parameters) {StringBuffer sb = new StringBuffer();// 所有参与传参的参数按照accsii排序（升序）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=" + KEY);System.out.println("字符串拼接后是：" + sb.toString());String sign = MD5Util.MD5Encode(sb.toString(), "UTF-8").toUpperCase();System.out.println("sign：" + sign);return sign;}
}

NotifyHandle：支付回调类

@Controller
@RequestMapping("notifyhandle")
public class NotifyHandle extends BaseAction{@Resourceprivate ServiceSinggleService ssService;@Resourceprivate ElutionRecordService edService;@Resourceprivate AppUserService appuserService;@Resourceprivate MsgJpushService mjService;private static final Logger logger = Logger.getLogger(NotifyHandle.class);@ResponseBody@RequestMapping(value="/notify")public String notify(ServiceSinggle ssinggle,ElutionRecord record,MsgJpush msgjpush,AppUser appuser,HttpServletRequest request,HttpSession session,HttpServletResponse response){String inputLine;String notityXml = "";String resXml = "";try {while ((inputLine = request.getReader().readLine()) != null) {notityXml += inputLine;}request.getReader().close();Map m = GetWxOrderno.parseXmlToList2(notityXml);String result_code = m.get("result_code").toString();if("SUCCESS".equals(result_code)){//查询是否存在订单String attach = m.get("attach").toString();String out_trade_no = m.get("out_trade_no").toString();String time_end = m.get("time_end").toString();String total_fee = m.get("total_fee").toString();int totalint = Integer.parseInt(total_fee);//订单更新 继续你的逻辑操作} else {resXml = ""+ ""+ ""+ " ";}BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());out.write(resXml.getBytes());out.flush();out.close();} catch (Exception e) {e.printStackTrace();}return "";}
}

APP的微信支付就是这么的简单：上面我贴的核心代码，一些工具类没有贴出来需要demo可以去下面地址下载

https://download.csdn.net/download/dsn727455218/10304062

如果遇到签名错误，缺少参数，返回-1，等错误请参考我的另一篇文章：微信支付遇到的几个问题

https://blog.csdn.net/dsn727455218/article/details/70139320

看着是不是很简单，完美的解决。

到这里已经完成了微信支付功能，如有需要可以加我Q群【308742428】大家一起讨论技术。

后面会不定时为大家更新文章，敬请期待。

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