SSM框架下实现小程序微信支付功能

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我是靠谱客的博主花痴啤酒，最近开发中收集的这篇文章主要介绍SSM框架下实现小程序微信支付功能，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

控制器部分

WeixinController.java

package com.WeChatpayment.controller;
import com.WeChatpayment.pojo.Json;
import com.WeChatpayment.pojo.OAuthJsToken;
import com.WeChatpayment.pojo.WxPayConfig;
import com.WeChatpayment.tools.IpUtils;
import com.WeChatpayment.tools.PayUtil;
import com.WeChatpayment.tools.StringUtils;
import com.alibaba.fastjson.JSONObject;
import org.codehaus.jackson.map.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.weixin4j.WeixinException;
import org.weixin4j.WeixinSupport;
import org.weixin4j.http.HttpsClient;
import org.weixin4j.http.Response;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
/**
* @Description: 本示例仅供参考，请根据自己的使用情景进行修改
* @Date: 2019/1/15
* @Author: wcf
*/
@RequestMapping("/weixin")
@Controller
public class WeixinController extends WeixinSupport{
private Logger logger = LoggerFactory.getLogger(getClass());
private static final String appid = "";
//微信小程序appid
private static final String secret = "";
//微信小程序密钥
private static final String grant_type = "authorization_code";
/**
* 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 openid
* @throws WeixinException
* @throws IOException
* @since Weixin4J 1.0.0
*/
@RequestMapping("login")
@ResponseBody
public Map<String, Object> login(String code, HttpServletRequest request) throws WeixinException, 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;
//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);
logger.info("openid=" + oauthJsToken.getOpenid());
ret.put("openid", oauthJsToken.getOpenid());
}
return ret;
}
/**
* @Description: 发起微信支付
* @param openid
* @param request
* @author: wcf
* @date: 2017年8月28日
*/
@RequestMapping("wxPay")
@ResponseBody
public Json wxPay(String openid, HttpServletRequest request){
Json json = new Json();
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";
//获取本机的ip地址
String spbill_create_ip = IpUtils.getIpAddr(request);
String orderNo = "123456789";
String money = "1";//支付金额，单位：分，这边需要转成字符串类型，否则后面的签名会失败
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", orderNo);//商户订单号
packageParams.put("total_fee", money);//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);
packageParams.put("trade_type", WxPayConfig.TRADETYPE);
packageParams.put("openid", openid);
// 除去数组中的空值和签名参数
packageParams = PayUtil.paraFilter(packageParams);
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();
logger.info("=======================第一次签名：" + mysign + "=====================");
//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>" + orderNo + "</out_trade_no>"
+ "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"
+ "<total_fee>" + money + "</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
//返回给移动端需要的参数
Map<String, Object> response = new HashMap<String, Object>();
if(return_code == "SUCCESS" || return_code.equals(return_code)){
// 业务结果
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
String stringSignTemp = "appId=" + WxPayConfig.appid + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id+ "&signType=" + WxPayConfig.SIGNTYPE + "&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();
logger.info("=======================第二次签名：" + paySign + "=====================");
response.put("paySign", paySign);
//更新订单信息
//业务逻辑代码
}
response.put("appid", WxPayConfig.appid);
json.setSuccess(true);
json.setData(response);
}catch(Exception e){
e.printStackTrace();
json.setSuccess(false);
json.setMsg("发起失败");
}
return json;
}
/**
* @Description:微信支付
* @return
* @author dzg
* @throws Exception
* @throws WeixinException
* @date 2016年12月2日
*/
@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
if(PayUtil.verify(PayUtil.createLinkString(map), (String)map.get("sign"), WxPayConfig.key, "utf-8")){
/**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();
}
}

所需的实体类：

ApiTicket.java

package com.WeChatpayment.pojo;
/**
* @Description:
* @Date: 2019/1/15
* @Author: WH
*/
public class ApiTicket {
private String ticket;
private long expires_in;
public String getTicket() {
return ticket;
}
public void setTicket(String ticket) {
this.ticket = ticket;
}
public long getExpires_in() {
return expires_in;
}
public void setExpires_in(long expires_in) {
//原expires_in是有效时长，比如：7200，现改为过期的时间戳
this.expires_in = System.currentTimeMillis() + (expires_in - 100) * 1000;
}
}

Json.java

package com.WeChatpayment.pojo;
/**
* @Description:
* @Date: 2019/1/15
* @Author: WH
*/
public class Json {
private boolean success;
private String msg;
private Object data;
public boolean isSuccess() {
return success;
}
public void setSuccess(boolean success) {
this.success = success;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
}

OAuthJsToken.java

package com.WeChatpayment.pojo;
/**
* @Description:
* @Date: 2019/1/15
* @Author: WH
*/
public class OAuthJsToken {
private String openid;
//用户唯一标识
private int expires_in = 7200;
//凭证有效时间，单位：秒
private String session_key;
//会话密匙
private long exprexpiredTime;
//过期时间
public String getOpenid() {
return openid;
}
public void setOpenid(String openid) {
this.openid = openid;
}
public int getExpires_in() {
return expires_in;
}
public void setExpires_in(int expires_in) {
this.expires_in = expires_in;
this.exprexpiredTime = System.currentTimeMillis() + expires_in * 1000;
}
public String getSession_key() {
return session_key;
}
public void setSession_key(String session_key) {
this.session_key = session_key;
}
public long getExprexpiredTime() {
return exprexpiredTime;
}
public void setExprexpiredTime(long exprexpiredTime) {
this.exprexpiredTime = exprexpiredTime;
}
/**
* 判断用户凭证是否过期
*
* @return 过期返回 true,否则返回false
*/
public boolean isExprexpired() {
return System.currentTimeMillis() >= this.exprexpiredTime;
}
}

WxPayConfig.java

package com.WeChatpayment.pojo;
/**
* @Description:
* @Date: 2019/1/15
* @Author: WH
*/
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";
}

所需的工具辅助类

IpUtils.java

package com.WeChatpayment.tools;
import javax.servlet.http.HttpServletRequest;
/**
* @Description:
* @Date: 2019/1/15
* @Author: WH
*/
public class IpUtils {
/**
* 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();
}
}

PayUtil.java

package com.WeChatpayment.tools;
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 javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.commons.codec.digest.DigestUtils;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
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("http://apache.org/xml/features/disallow-doctype-decl", true);
documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
documentBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", 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());
}
}

StringUtils.java

package com.WeChatpayment.tools;
import java.util.Random;
/**
* @Description:
* @Date: 2019/1/15
* @Author: WH
*/
public class StringUtils extends org.apache.commons.lang3.StringUtils{
/**
* 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();
}
}