原文:https://blog.csdn.net/zhourenfei17/article/details/77765585
话不多说,直接开撸。
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。
详细步骤可参考:https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_4&index=3
demo链接: https://pan.baidu.com/s/1v8QWUE1m2EnA4uAoAZtRRQ 密码: cgrt
一、获取openid,
这里的代码可以参考博主的另外一篇文章http://blog.csdn.net/zhourenfei17/article/details/77714600中的 3.1 代码模块,代码先贴上,如果了解更多点击链接查看
小程序端代码
wx.login({
success: function (res) {
var service_url = 'https://???/???/weixin/api/login?code=' + 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( "https://api.weixin.qq.com/sns/jscode2session" + param);
-
-
//创建请求对象
-
HttpsClient http = new HttpsClient();
-
//调用获取access_token接口
-
Response res = http.get( "https://api.weixin.qq.com/sns/jscode2session" + 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 Json 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=="SUCCESS"||return_code.equals(return_code)){
-
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 = "https://??/??/weixin/api/wxNotify";
-
//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 = "https://api.mch.weixin.qq.com/pay/unifiedorder";
-
}
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;
-
}
-
-
Map m = new HashMap();
-
InputStream in = String2Inputstream(strxml);
-
SAXBuilder builder = new SAXBuilder();
-
Document doc = builder.build(in);
-
Element root = doc.getRootElement();
-
List list = root.getChildren();
-
Iterator it = list.iterator();
-
while(it.hasNext()) {
-
Element e = (Element) it.next();
-
String k = e.getName();
-
String v = "";
-
List children = e.getChildren();
-
if(children.isEmpty()) {
-
v = e.getTextNormalize();
-
} else {
-
v = getChildrenText(children);
-
}
-
-
m.put(k, v);
-
}
-
-
//关闭流
-
in.close();
-
-
return m;
-
}
-
/**
-
* 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();
-
}
-
来源:oschina
链接:https://my.oschina.net/u/4384474/blog/3866472