前言:
此刻我们对“java后端接收文件方式”大体比较珍视,各位老铁们都需要剖析一些“java后端接收文件方式”的相关资讯。那么小编也在网络上汇集了一些对于“java后端接收文件方式””的相关资讯,希望大家能喜欢,看官们一起来了解一下吧!大家号,今天来分享下微信小程序支付,可能版有些老,大体上应该差不多,话不多说啥,来看看代码:
先来看看支付流程步骤:
1)首先调用wx.login方法获取code,通过code获取openid
2)java后台调用统一下单支付接口(这里会进行第一次签名),用来获取prepay_id
3)java后台再次调用签名(这里会进行第二次签名),并返回支付需要用使用的参数
4)小程序前端wx.requestPayment方法发起微信支付
5)java后台接收来自微信服务器的通知并处理结果
来来啦,代码步骤:
一、获取openid,小程序端代码
wx.login({ success: function (res) { var service_url = '; + res.code;//需要将服务器域名添加到小程序的request合法域名中,而且必须是https开头 wx.request({ url: l, data: {}, method: 'GET', success: function (res) { console.log(res); if (res.data != null && res.data != undefined && res.data != '') { wx.setStorageSync("openid", res.data.openid);//将获取的openid存到缓存中 } } }); } });
java后端代码
/** * 小程序后台登录,向微信平台发送获取access_token请求,并返回openId * @param code * @return 用户凭证 * @throws WeixinException * @throws IOException * @throws JsonMappingException * @throws JsonParseException */ @RequestMapping("login") @ResponseBody public Map<String, Object> login(String code, HttpServletRequest request) throws WeixinException, JsonParseException, JsonMappingException, IOException { if (code == null || code.equals("")) { throw new WeixinException("invalid null, code is null."); } Map<String, Object> ret = new HashMap<String, Object>(); //拼接参数 String param = "?grant_type=" + grant_type + "&appid=" + appid + "&secret=" + secret + "&js_code=" + code; System.out.println("; + param); //创建请求对象 HttpsClient http = new HttpsClient(); //调用获取access_token接口 Response res = http.get("; + param); //根据请求结果判定,是否验证成功 JSONObject jsonObj = res.asJSONObject(); if (jsonObj != null) { Object errcode = jsonObj.get("errcode"); if (errcode != null) { //返回异常信息 throw new WeixinException(getCause(Integer.parseInt(errcode.toString()))); } ObjectMapper mapper = new ObjectMapper(); OAuthJsToken oauthJsToken = mapper.readValue(jsonObj.toJSONString(),OAuthJsToken.class); ret.put("openid", oauthJsToken.getOpenid()); } return ret; }二、小程序调用java后端接口,生成最终签名和相关参数小程序端代码:
var that = this; wx.request({ url: service_url + 'wxPay', data: { }, method: 'GET', success: function (res) { console.log(res); that.doWxPay(res.data); } });
java端代码:
/** * @Description: 发起微信支付 * @param request */ public Map<String, Object> wxPay(Integer openid, HttpServletRequest request){ try{ //生成的随机字符串 String nonce_str = StringUtils.getRandomStringByLength(32); //商品名称 String body = "测试商品名称"; //获取客户端的ip地址 String spbill_create_ip = IpUtil.getIpAddr(request); //组装参数,用户生成统一下单接口的签名 Map<String, String> packageParams = new HashMap<String, String>(); packageParams.put("appid", WxPayConfig.appid); packageParams.put("mch_id", WxPayConfig.mch_id); packageParams.put("nonce_str", nonce_str); packageParams.put("body", body); packageParams.put("out_trade_no", "123456789");//商户订单号 packageParams.put("total_fee", "1");//支付金额,这边需要转成字符串类型,否则后面的签名会失败 packageParams.put("spbill_create_ip", spbill_create_ip); packageParams.put("notify_url", WxPayConfig.notify_url);//支付成功后的回调地址 packageParams.put("trade_type", WxPayConfig.TRADETYPE);//支付方式 packageParams.put("openid", openid); String prestr = PayUtil.createLinkString(packageParams); // 把数组所有元素,按照“参数=参数值”的模式用“&”字符拼接成字符串 //MD5运算生成签名,这里是第一次签名,用于调用统一下单接口 String mysign = PayUtil.sign(prestr, WxPayConfig.key, "utf-8").toUpperCase(); //拼接统一下单接口使用的xml数据,要将上一步生成的签名一起拼接进去 String xml = "<xml>" + "<appid>" + WxPayConfig.appid + "</appid>" + "<body><![CDATA[" + body + "]]></body>" + "<mch_id>" + WxPayConfig.mch_id + "</mch_id>" + "<nonce_str>" + nonce_str + "</nonce_str>" + "<notify_url>" + WxPayConfig.notify_url + "</notify_url>" + "<openid>" + openid + "</openid>" + "<out_trade_no>" + "123456789" + "</out_trade_no>" + "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>" + "<total_fee>" + "1" + "</total_fee>" + "<trade_type>" + WxPayConfig.TRADETYPE + "</trade_type>" + "<sign>" + mysign + "</sign>" + "</xml>"; System.out.println("调试模式_统一下单接口 请求XML数据:" + xml); //调用统一下单接口,并接受返回的结果 String result = PayUtil.httpRequest(WxPayConfig.pay_url, "POST", xml); System.out.println("调试模式_统一下单接口 返回XML数据:" + result); // 将解析结果存储在HashMap中 Map map = PayUtil.doXMLParse(result); String return_code = (String) map.get("return_code");//返回状态码 Map<String, Object> response = new HashMap<String, Object>();//返回给小程序端需要的参数 if(return_code.equals("SUCCESS")){ String prepay_id = (String) map.get("prepay_id");//返回的预付单信息 response.put("nonceStr", nonce_str); response.put("package", "prepay_id=" + prepay_id); Long timeStamp = System.currentTimeMillis() / 1000; response.put("timeStamp", timeStamp + "");//这边要将返回的时间戳转化成字符串,不然小程序端调用wx.requestPayment方法会报签名错误 //拼接签名需要的参数 String stringSignTemp = "appId=" + WxPayConfig.appid + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id+ "&signType=MD5&timeStamp=" + timeStamp; //再次签名,这个签名用于小程序端调用wx.requesetPayment方法 String paySign = PayUtil.sign(stringSignTemp, WxPayConfig.key, "utf-8").toUpperCase(); response.put("paySign", paySign); } response.put("appid", WxPayConfig.appid); return response; }catch(Exception e){ e.printStackTrace(); } return null; } /** * StringUtils工具类方法 * 获取一定长度的随机字符串,范围0-9,a-z * @param length:指定字符串长度 * @return 一定长度的随机字符串 */ public static String getRandomStringByLength(int length) { String base = "abcdefghijklmnopqrstuvwxyz0123456789"; 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(); } /** * IpUtils工具类方法 * 获取真实的ip地址 * @param request * @return */ public static String getIpAddr(HttpServletRequest request) { String ip = request.getHeader("X-Forwarded-For"); if(StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)){ //多次反向代理后会有多个ip值,第一个ip才是真实ip int index = ip.indexOf(","); if(index != -1){ return ip.substring(0,index); }else{ return ip; } } ip = request.getHeader("X-Real-IP"); if(StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)){ return ip; } return request.getRemoteAddr(); }
WxPayConfig小程序配置文件:
/** * 小程序微信支付的配置文件 * @author * */public class WxPayConfig { //小程序appid public static final String appid = ""; //微信支付的商户id public static final String mch_id = ""; //微信支付的商户密钥 public static final String key = ""; //支付成功后的服务器回调url public static final String notify_url = ";; //签名方式,固定值 public static final String SIGNTYPE = "MD5"; //交易类型,小程序支付的固定值为JSAPI public static final String TRADETYPE = "JSAPI"; //微信统一下单接口地址 public static final String pay_url = ";;}
PayUtils工具类:
import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.security.SignatureException;import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map; import org.apache.commons.codec.digest.DigestUtils;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder; public class PayUtil { /** * 签名字符串 * @param text需要签名的字符串 * @param key 密钥 * @param input_charset编码格式 * @return 签名结果 */ public static String sign(String text, String key, String input_charset) { text = text + "&key=" + key; return DigestUtils.md5Hex(getContentBytes(text, input_charset)); } /** * 签名字符串 * @param text需要签名的字符串 * @param sign 签名结果 * @param key密钥 * @param input_charset 编码格式 * @return 签名结果 */ public static boolean verify(String text, String sign, String key, String input_charset) { text = text + key; String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset)); if (mysign.equals(sign)) { return true; } else { return false; } } /** * @param content * @param charset * @return * @throws SignatureException * @throws UnsupportedEncodingException */ public static byte[] getContentBytes(String content, String charset) { if (charset == null || "".equals(charset)) { return content.getBytes(); } try { return content.getBytes(charset); } catch (UnsupportedEncodingException e) { throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset); } } private static boolean isValidChar(char ch) { if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) return true; if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f)) return true;// 简体中文汉字编码 return false; } /** * 除去数组中的空值和签名参数 * @param sArray 签名参数组 * @return 去掉空值与签名参数后的新签名参数组 */ public static Map<String, String> paraFilter(Map<String, String> sArray) { Map<String, String> result = new HashMap<String, String>(); if (sArray == null || sArray.size() <= 0) { return result; } for (String key : sArray.keySet()) { String value = sArray.get(key); if (value == null || value.equals("") || key.equalsIgnoreCase("sign") || key.equalsIgnoreCase("sign_type")) { continue; } result.put(key, value); } return result; } /** * 把数组所有元素排序,并按照“参数=参数值”的模式用“&”字符拼接成字符串 * @param params 需要排序并参与字符拼接的参数组 * @return 拼接后字符串 */ public static String createLinkString(Map<String, String> params) { List<String> keys = new ArrayList<String>(params.keySet()); Collections.sort(keys); String prestr = ""; for (int i = 0; i < keys.size(); i++) { String key = keys.get(i); String value = params.get(key); if (i == keys.size() - 1) {// 拼接时,不包括最后一个&字符 prestr = prestr + key + "=" + value; } else { prestr = prestr + key + "=" + value + "&"; } } return prestr; } /** * * @param requestUrl请求地址 * @param requestMethod请求方法 * @param outputStr参数 */ public static String httpRequest(String requestUrl,String requestMethod,String outputStr){ // 创建SSLContext StringBuffer buffer = null; try{ URL url = new URL(requestUrl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod(requestMethod); conn.setDoOutput(true); conn.setDoInput(true); conn.connect(); //往服务器端写内容 if(null !=outputStr){ OutputStream os=conn.getOutputStream(); os.write(outputStr.getBytes("utf-8")); os.close(); } // 读取服务器端返回的内容 InputStream is = conn.getInputStream(); InputStreamReader isr = new InputStreamReader(is, "utf-8"); BufferedReader br = new BufferedReader(isr); buffer = new StringBuffer(); String line = null; while ((line = br.readLine()) != null) { buffer.append(line); } br.close(); }catch(Exception e){ e.printStackTrace(); } return buffer.toString(); } public static String urlEncodeUTF8(String source){ String result=source; try { result=java.net.URLEncoder.encode(source, "UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; } /** * 解析xml,返回第一级元素键值对。如果第一级元素有子节点,则此节点的值是子节点的xml数据。 * @param strxml * @return * @throws JDOMException * @throws IOException */ public static Map doXMLParse(String strxml) throws Exception { if(null == strxml || "".equals(strxml)) { return null; } /*============= !!!!注意,修复了微信官方反馈的漏洞,更新于2018-10-16 ===========*/ try { Map<String, String> data = new HashMap<String, String>(); // TODO 在这里更换 DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); documentBuilderFactory.setFeature(";, true); documentBuilderFactory.setFeature(";, false); documentBuilderFactory.setFeature(";, false); documentBuilderFactory.setFeature(";, false); documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); documentBuilderFactory.setXIncludeAware(false); documentBuilderFactory.setExpandEntityReferences(false); InputStream stream = new ByteArrayInputStream(strxml.getBytes("UTF-8")); org.w3c.dom.Document doc = documentBuilderFactory.newDocumentBuilder().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) { throw ex; } } /** * 获取子结点的xml * @param children * @return String */ 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 InputStream String2Inputstream(String str) { return new ByteArrayInputStream(str.getBytes()); }}三、小程序端发起最终支付,调用微信付款
doWxPay(param){ //小程序发起微信支付 wx.requestPayment({ timeStamp: param.data.timeStamp,//记住,这边的timeStamp一定要是字符串类型的,不然会报错,我这边在java后端包装成了字符串类型了 nonceStr: param.data.nonceStr, package: param.data.package, signType: 'MD5', paySign: param.data.paySign, success: function (event) { // success console.log(event); wx.showToast({ title: '支付成功', icon: 'success', duration: 2000 }); }, fail: function (error) { // fail console.log("支付失败") console.log(error) }, complete: function () { // complete console.log("pay complete") } }); }四、微信服务器通知java后端
/** * @Description:微信支付 * @return * @throws Exception */ @RequestMapping(value="/wxNotify") @ResponseBody public void wxNotify(HttpServletRequest request,HttpServletResponse response) throws Exception{ BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream())); String line = null; StringBuilder sb = new StringBuilder(); while((line = br.readLine()) != null){ sb.append(line); } br.close(); //sb为微信返回的xml String notityXml = sb.toString(); String resXml = ""; System.out.println("接收到的报文:" + notityXml); Map map = PayUtil.doXMLParse(notityXml); String returnCode = (String) map.get("return_code"); if("SUCCESS".equals(returnCode)){ //验证签名是否正确 Map<String, String> validParams = PayUtil.paraFilter(map); //回调验签时需要去除sign和空值参数 String validStr = PayUtil.createLinkString(validParams);//把数组所有元素,按照“参数=参数值”的模式用“&”字符拼接成字符串 String sign = PayUtil.sign(validStr, WxPayConfig.key, "utf-8").toUpperCase();//拼装生成服务器端验证的签名 //根据微信官网的介绍,此处不仅对回调的参数进行验签,还需要对返回的金额与系统订单的金额进行比对等 if(sign.equals(map.get("sign"))){ /**此处添加自己的业务逻辑代码start**/ /**此处添加自己的业务逻辑代码end**/ //通知微信服务器已经支付成功 resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>" + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> "; } }else{ resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> "; } System.out.println(resXml); System.out.println("微信支付回调数据结束"); BufferedOutputStream out = new BufferedOutputStream( response.getOutputStream()); out.write(resXml.getBytes()); out.flush(); out.close(); }
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