微信小程序支付接口的实例详解
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2022-03-04 11:36:29
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微信小程序支付
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第一步
进入小程序，下单，请求下单支付，调用小程序登录API来获取Openid,生成商户订单，这些都是在小程序端完成的业务。
小程序端代码
// pages/pay/pay.jsvar app = getApp();
Page({
data: {},
onLoad: function (options) {
// 页面初始化 options为页面跳转所带来的参数
}, /* 微信支付 */
wxpay: function () {
var that = this
//登陆获取code
wx.login({
success: function (res) {
console.log(res.code) //获取openid
that.getOpenId(res.code)
}
});
},
getOpenId: function (code) {
var that = this;
wx.request({
url: "https://api.weixin.qq.com/sns/jscode2session?appid=wxa142513e524e496c&secret=5d6a7d86048884e7c60f84f7aa85253c&js_code=" + code + "&grant_type=authorization_code",
data: {},
method: 'GET',
success: function (res) {
console.log('返回openId')
console.log(res.data)
that.generateOrder(res.data.openid)
},
fail: function () {
// fail
},
complete: function () {
// complete
}
})
}, /**生成商户订单 */
generateOrder: function (openid) {
var that = this
//统一支付
wx.request({
url: 'http://localhost:8070/RMS/pay_pay.action',
method: 'GET',
data: {
total_fee: '5',
body: '支付测试',
attach:'真假酒水'
},
success: function (res) {
console.log(res) var pay = res.data //发起支付
var timeStamp = pay[0].timeStamp;
console.log("timeStamp:"+timeStamp) var packages = pay[0].package;
console.log("package:"+packages) var paySign = pay[0].paySign;
console.log("paySign:"+paySign) var nonceStr = pay[0].nonceStr;
console.log("nonceStr:"+nonceStr) var param = { "timeStamp": timeStamp, "package": packages, "paySign": paySign, "signType": "MD5", "nonceStr": nonceStr };
that.pay(param)
},
})
}, /* 支付 */
pay: function (param) {
console.log("支付")
console.log(param)
wx.requestPayment({
timeStamp: param.timeStamp,
nonceStr: param.nonceStr,
package: param.package,
signType: param.signType,
paySign: param.paySign,
success: function (res) {
// success
console.log("支付")
console.log(res)
wx.navigateBack({
delta: 1, // 回退前 delta(默认为1) 页面
success: function (res) {
wx.showToast({
title: '支付成功',
icon: 'success',
duration: 2000
})
},
fail: function () {
// fail
},
complete: function () {
// complete
}
})
},
fail: function (res) {
// fail
console.log("支付失败")
console.log(res)
},
complete: function () {
// complete
console.log("pay complete")
}
})
}
})
第二步
调用支付统一下单API来获取prepay_id，并将小程序调起支付数据需要签名的字段appId，timeStamp，nonceStr，package再次签名
后台代码
package cn.it.shop.action;import java.io.ByteArrayInputStream;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import cn.it.shop.util.MessageUtil;import cn.it.shop.util.PayUtil;import cn.it.shop.util.PaymentPo;import cn.it.shop.util.UUIDHexGenerator;import net.sf.json.JSONArray;import net.sf.json.JSONObject;/**
* @author
* @version 创建时间：2017年1月21日 下午4:59:03
* 小程序端请求的后台action，返回签名后的数据传到前台
*/public class PayAction { private String total_fee;//总金额
private String body;//商品描述
private String detail;//商品详情
private String attach;//附加数据
private String time_start;//交易起始时间
private String time_expire;//交易结束时间
private String openid;//用户标识
private JSONArray jsonArray=new JSONArray(); public String pay() throws UnsupportedEncodingException, DocumentException{
body = new String(body.getBytes("UTF-8"),"ISO-8859-1");
String appid = "替换为自己的小程序ID";//小程序ID
String mch_id = "替换为自己的商户号";//商户号
String nonce_str = UUIDHexGenerator.generate();//随机字符串
String today = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()); String code = PayUtil.createCode(8); String out_trade_no = mch_id+today+code;//商户订单号
String spbill_create_ip = "替换为自己的终端IP";//终端IP
String notify_url = "http://www.weixin.qq.com/wxpay/pay.php";//通知地址
String trade_type = "JSAPI";//交易类型
String openid="替换为用户的openid";//用户标识
/**/
PaymentPo paymentPo = new PaymentPo();
paymentPo.setAppid(appid);
paymentPo.setMch_id(mch_id);
paymentPo.setNonce_str(nonce_str); String newbody=new String(body.getBytes("ISO-8859-1"),"UTF-8");//以utf-8编码放入paymentPo，微信支付要求字符编码统一采用UTF-8字符编码
paymentPo.setBody(newbody);
paymentPo.setOut_trade_no(out_trade_no);
paymentPo.setTotal_fee(total_fee);
paymentPo.setSpbill_create_ip(spbill_create_ip);
paymentPo.setNotify_url(notify_url);
paymentPo.setTrade_type(trade_type);
paymentPo.setOpenid(openid); // 把请求参数打包成数组
Map<String, String> sParaTemp = new HashMap<String, String>();
sParaTemp.put("appid", paymentPo.getAppid());
sParaTemp.put("mch_id", paymentPo.getMch_id());
sParaTemp.put("nonce_str", paymentPo.getNonce_str());
sParaTemp.put("body", paymentPo.getBody());
sParaTemp.put("out_trade_no", paymentPo.getOut_trade_no());
sParaTemp.put("total_fee",paymentPo.getTotal_fee());
sParaTemp.put("spbill_create_ip", paymentPo.getSpbill_create_ip());
sParaTemp.put("notify_url",paymentPo.getNotify_url());
sParaTemp.put("trade_type", paymentPo.getTrade_type());
sParaTemp.put("openid", paymentPo.getOpenid()); // 除去数组中的空值和签名参数
Map<String, String> sPara = PayUtil.paraFilter(sParaTemp); String prestr = PayUtil.createLinkString(sPara); // 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 key = "&key=替换为商户支付密钥"; // 商户支付密钥
//MD5运算生成签名
String mysign = PayUtil.sign(prestr, key, "utf-8").toUpperCase();
paymentPo.setSign(mysign); //打包要发送的xml
String respXml = MessageUtil.messageToXML(paymentPo); // 打印respXml发现，得到的xml中有“”不对，应该替换成“_”
respXml = respXml.replace(, "_"); String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//统一下单API接口链接
String param = respXml; //String result = SendRequestForUrl.sendRequest(url, param);//发起请求
String result =PayUtil.httpRequest(url, "POST", param); // 将解析结果存储在HashMap中
Map<String, String> map = new HashMap<String, String>();
InputStream in=new ByteArrayInputStream(result.getBytes());
// 读取输入流
SAXReader reader = new SAXReader();
Document document = reader.read(in); // 得到xml根元素
Element root = document.getRootElement(); // 得到根元素的所有子节点
@SuppressWarnings("unchecked") List<Element> elementList = root.elements();
for (Element element : elementList) { map.put(element.getName(), element.getText());
} // 返回信息
String return_code = map.get("return_code");//返回状态码
String return_msg = map.get("return_msg");//返回信息
System.out.println("return_msg"+return_msg);
JSONObject JsonObject=new JSONObject() ; if(return_code=="SUCCESS"||return_code.equals(return_code)){ // 业务结果
String prepay_id = map.get("prepay_id");//返回的预付单信息
String nonceStr=UUIDHexGenerator.generate();
JsonObject.put("nonceStr", nonceStr);
JsonObject.put("package", "prepay_id="+prepay_id);
Long timeStamp= System.currentTimeMillis()/1000;
JsonObject.put("timeStamp", timeStamp+""); String stringSignTemp = "appId="+appid+"&nonceStr=" + nonceStr + "&package=prepay_id=" + prepay_id+ "&signType=MD5&timeStamp=" + timeStamp; //再次签名
String paySign=PayUtil.sign(stringSignTemp, "&key=替换为自己的密钥", "utf-8").toUpperCase();
JsonObject.put("paySign", paySign);
jsonArray.add(JsonObject);
} return "pay";
} public String getTotal_fee() { return total_fee;
} public void setTotal_fee(String total_fee) {
this.total_fee = total_fee;
} public String getBody() { return body;
} public void setBody(String body) {
this.body = body;
} public JSONArray getJsonArray() { return jsonArray;
} public void setJsonArray(JSONArray jsonArray) {
this.jsonArray = jsonArray;
} public String getDetail() { return detail;
} public void setDetail(String detail) {
this.detail = detail;
} public String getAttach() { return attach;
} public void setAttach(String attach) {
this.attach = attach;
} public String getTime_start() { return time_start;
} public void setTime_start(String time_start) {
this.time_start = time_start;
} public String getTime_expire() { return time_expire;
} public void setTime_expire(String time_expire) {
this.time_expire = time_expire;
} public String getOpenid() { return openid;
} public void setOpenid(String openid) {
this.openid = openid;
}
}
后台业务逻辑涉及到的工具类及参数封装类
MessageUtil
package cn.it.shop.util;import java.io.IOException;import java.io.Writer;import java.util.HashMap;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.io.SAXReader;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.core.util.QuickWriter;import com.thoughtworks.xstream.io.HierarchicalStreamWriter;import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;import com.thoughtworks.xstream.io.xml.XppDriver;public class MessageUtil {
public static HashMap<String,String> parseXML(HttpServletRequest request) throws Exception, IOException{
HashMap<String,String> map=new HashMap<String,String>(); // 通过IO获得Document
SAXReader reader = new SAXReader();
Document doc = reader.read(request.getInputStream()); //得到xml的根节点
Element root=doc.getRootElement();
recursiveParseXML(root,map); return map;
} private static void recursiveParseXML(Element root,HashMap<String,String> map){ //得到根节点的子节点列表
List<Element> elementList=root.elements(); //判断有没有子元素列表
if(elementList.size()==0){
map.put(root.getName(), root.getTextTrim());
} else{ //遍历
for(Element e:elementList){
recursiveParseXML(e,map);
}
}
} private static XStream xstream = new XStream(new XppDriver() { public HierarchicalStreamWriter createWriter(Writer out) { return new PrettyPrintWriter(out) { // 对所有xml节点都增加CDATA标记
boolean cdata = true; public void startNode(String name, Class clazz) { super.startNode(name, clazz);
} protected void writeText(QuickWriter writer, String text) { if (cdata) {
writer.write("<![CDATA[");
writer.write(text);
writer.write("]]>");
} else {
writer.write(text);
}
}
};
}
}); public static String messageToXML(PaymentPo paymentPo){
xstream.alias("xml",PaymentPo.class); return xstream.toXML(paymentPo);
}
}
PaymentPo//封装支付参数实体package cn.it.shop.util;/**
* @author * @version 创建时间：2017年1月21日 下午4:20:52
* 类说明
*/public class PaymentPo {
private String appid;//小程序ID
private String mch_id;//商户号
private String device_info;//设备号
private String nonce_str;//随机字符串
private String sign;//签名
private String body;//商品描述
private String detail;//商品详情
private String attach;//附加数据
private String out_trade_no;//商户订单号
private String fee_type;//货币类型
private String spbill_create_ip;//终端IP
private String time_start;//交易起始时间
private String time_expire;//交易结束时间
private String goods_tag;//商品标记
private String total_fee;//总金额
private String notify_url;//通知地址
private String trade_type;//交易类型
private String limit_pay;//指定支付方式
private String openid;//用户标识
public String getAppid() { return appid;
} public void setAppid(String appid) { this.appid = appid;
} public String getMch_id() { return mch_id;
} public void setMch_id(String mch_id) { this.mch_id = mch_id;
} public String getNonce_str() { return nonce_str;
} public void setNonce_str(String nonce_str) { this.nonce_str = nonce_str;
} public String getSign() { return sign;
} public void setSign(String sign) { this.sign = sign;
} public String getBody() { return body;
} public void setBody(String body) { this.body = body;
} public String getOut_trade_no() { return out_trade_no;
} public void setOut_trade_no(String out_trade_no) { this.out_trade_no = out_trade_no;
} public String getTotal_fee() { return total_fee;
} public void setTotal_fee(String total_fee) { this.total_fee = total_fee;
} public String getNotify_url() { return notify_url;
} public void setNotify_url(String notify_url) { this.notify_url = notify_url;
} public String getTrade_type() { return trade_type;
} public void setTrade_type(String trade_type) { this.trade_type = trade_type;
} public String getOpenid() { return openid;
} public void setOpenid(String openid) { this.openid = openid;
} public String getSpbill_create_ip() { return spbill_create_ip;
} public void setSpbill_create_ip(String spbill_create_ip) { this.spbill_create_ip = spbill_create_ip;
} public String getDevice_info() { return device_info;
} public void setDevice_info(String device_info) { this.device_info = device_info;
} public String getDetail() { return detail;
} public void setDetail(String detail) { this.detail = detail;
} public String getAttach() { return attach;
} public void setAttach(String attach) { this.attach = attach;
} public String getFee_type() { return fee_type;
} public void setFee_type(String fee_type) { this.fee_type = fee_type;
} public String getTime_start() { return time_start;
} public void setTime_start(String time_start) { this.time_start = time_start;
} public String getTime_expire() { return time_expire;
} public void setTime_expire(String time_expire) { this.time_expire = time_expire;
} public String getGoods_tag() { return goods_tag;
} public void setGoods_tag(String goods_tag) { this.goods_tag = goods_tag;
} public String getLimit_pay() { return limit_pay;
} public void setLimit_pay(String limit_pay) { this.limit_pay = limit_pay;
}
}
PayUtilpackage cn.it.shop.util;import java.io.BufferedReader;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.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.List;import java.util.Map;import org.apache.commons.codec.digest.DigestUtils;/**
* @author
* @version 创建时间：2017年1月17日 下午7:46:29 类说明
*/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; 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);
}
} /**
* 生成6位或10位随机数 param codeLength(多少位)
* @return
*/
public static String createCode(int codeLength) {
String code = ""; for (int i = 0; i < codeLength; i++) {
code += (int) (Math.random() * 9);
} return code;
} 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);
}
}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;
}
}
UUIDHexGeneratorpackage cn.it.shop.util;import java.net.InetAddress;/**
* @author
* @version 创建时间：2017年1月17日 下午7:45:06 类说明
*/public class UUIDHexGenerator {
private static String sep = ""; private static final int IP; private static short counter = (short) 0; private static final int JVM = (int) (System.currentTimeMillis() >>> 8); private static UUIDHexGenerator uuidgen = new UUIDHexGenerator(); static { int ipadd; try {
ipadd = toInt(InetAddress.getLocalHost().getAddress());
} catch (Exception e) {
ipadd = 0;
}
IP = ipadd;
} public static UUIDHexGenerator getInstance() { return uuidgen;
} public static int toInt(byte[] bytes) { int result = 0; for (int i = 0; i < 4; i++) {
result = (result << 8) - Byte.MIN_VALUE + (int) bytes[i];
} return result;
} protected static String format(int intval) {
String formatted = Integer.toHexString(intval);
StringBuffer buf = new StringBuffer("00000000");
buf.replace(8 - formatted.length(), 8, formatted); return buf.toString();
} protected static String format(short shortval) {
String formatted = Integer.toHexString(shortval);
StringBuffer buf = new StringBuffer("0000");
buf.replace(4 - formatted.length(), 4, formatted); return buf.toString();
} protected static int getJVM() { return JVM;
} protected synchronized static short getCount() { if (counter < 0) {
counter = 0;
} return counter++;
} protected static int getIP() { return IP;
} protected static short getHiTime() { return (short) (System.currentTimeMillis() >>> 32);
} protected static int getLoTime() { return (int) System.currentTimeMillis();
} public static String generate() { return new StringBuffer(36).append(format(getIP())).append(sep).append(format(getJVM())).append(sep)
.append(format(getHiTime())).append(sep).append(format(getLoTime())).append(sep)
.append(format(getCount())).toString();
} /**
* @param args
*/
public static void main(String[] args) {
String id="";
UUIDHexGenerator uuid = UUIDHexGenerator.getInstance(); /*
for (int i = 0; i < 100; i++) {
id = uuid.generate();
}*/
id = uuid.generate();
System.out.println(id);
}
}
第一次写，写的不是太完整，希望同大家多多交流，一起进步。
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