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来看看!微信小程序支付 java 的示例

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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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