java集成微信支付

废话不多说，直接上代码

首先附上一位大佬的连接：https://blog.csdn.net/m_sicily/article/details/82493171

pom

<dependency><groupId>com.github.wxpay</groupId><artifactId>wxpay-sdk</artifactId><version>0.0.3</version>
</dependency>
<dependency><groupId>org.dom4j</groupId><artifactId>dom4j</artifactId><version>2.1.3</version>
</dependency>

WxMD5Util：标签加密工具类

import com.github.wxpay.sdk.WXPayConstants;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Map;
import java.util.Set;
public class WxMD5Util {public String getSign(Map<String, String> data) throws Exception {MyWXPayConfig config = new MyWXPayConfig();Set<String> keySet = data.keySet();String[] keyArray = keySet.toArray(new String[keySet.size()]);Arrays.sort(keyArray);StringBuilder sb = new StringBuilder();for (String k : keyArray) {if (k.equals(WXPayConstants.FIELD_SIGN)) {continue;}if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名sb.append(k).append("=").append(data.get(k).trim()).append("&");}sb.append("key=").append(config.getKey());MessageDigest md = null;try {md = MessageDigest.getInstance("MD5");} catch (NoSuchAlgorithmException e) {e.printStackTrace();}byte[] array = new byte[0];try {array = md.digest(sb.toString().getBytes("UTF-8"));} catch (UnsupportedEncodingException e) {e.printStackTrace();}StringBuilder sb2 = new StringBuilder();for (byte item : array) {sb2.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));}return sb2.toString().toUpperCase();}
}

MyWXPayConfig：微信支付配置项

import com.github.wxpay.sdk.WXPayConfig;import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;public class MyWXPayConfig implements WXPayConfig {private byte[] certData;public static final String APP_ID = "应用id";public static final String KEY = "秘钥";public static final String MCH_ID = "商户id";@Overridepublic String getAppID() {return APP_ID;}@Overridepublic String getMchID() {return MCH_ID;}@Overridepublic String getKey() {return KEY;}@Overridepublic InputStream getCertStream() {ByteArrayInputStream certBis = new ByteArrayInputStream(this.certData);return certBis;}@Overridepublic int getHttpConnectTimeoutMs() {return 8000;}@Overridepublic int getHttpReadTimeoutMs() {return 10000;}
}

WXService：接口

import java.util.Map;public interface WXService {/*** 获取预付订单等参数*/Map<String, String> unifiedOrder(String attach, String total_fee) throws Exception;/*** 支付异步结果通知*/String payBack(String notifyData);
}

WXServiceImpl：实现类

import com.alibaba.fastjson.JSONObject;
import com.github.wxpay.sdk.WXPay;
import com.github.wxpay.sdk.WXPayConfig;
import com.github.wxpay.sdk.WXPayConstants;
import com.github.wxpay.sdk.WXPayUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;@Slf4j
@Service
public class WXServiceImpl implements WXService {public static final String SPBILL_CREATE_IP = "127.0.0.1";public static final String NOTIFY_URL = "回调接口的地址";public static final String TRADE_TYPE_APP = "APP";@Autowiredprivate RedisService redisService;@Autowiredprivate UserInfoController userInfoController;@Overridepublic Map<String, String> unifiedOrder(String attach, String money) throws Exception {BigDecimal totalPrice = new BigDecimal(money);String totalFee = totalPrice.multiply(new BigDecimal(100)).toBigInteger().toString();WxMD5Util md5Util = new WxMD5Util();Map<String, String> returnMap = new HashMap<>();MyWXPayConfig config = new MyWXPayConfig();WXPay wxpay = new WXPay(config);Map<String, String> data = new HashMap<>();//生成商户订单号，不可重复，UUID就行Long aLong = SnowFlakeGenerator.generateId();data.put("appid", config.getAppID());data.put("mch_id", config.getMchID());String body = "订单支付";data.put("body", body);String sign1 = md5Util.getSign(data);System.out.println(sign1);data.put("sign", sign1);data.put("nonce_str", WXPayUtil.generateNonceStr());data.put("out_trade_no", aLong.toString());data.put("total_fee", totalFee);//自己的服务器IP地址data.put("spbill_create_ip", SPBILL_CREATE_IP);//异步通知地址（请注意必须是外网）data.put("notify_url", NOTIFY_URL);// 将用户id存入redis中，out_trade_no:userId，（根据各自业务需求）// Long userId = JSONObject.parseObject(attach).getLong("userId");// redisService.set(aLong.toString(), userId, 60*10);//交易类型data.put("trade_type", TRADE_TYPE_APP);//附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据data.put("attach", attach);try {//使用官方API请求预付订单Map<String, String> response = wxpay.unifiedOrder(data);System.out.println("response：" + response);//获取返回码String returnCode = response.get("return_code");//若返回码为SUCCESS，则会返回一个result_code,再对该result_code进行判断if (returnCode.equals("SUCCESS")) {//主要返回以下5个参数String resultCode = response.get("result_code");returnMap.put("appid", response.get("appid"));returnMap.put("mch_id", response.get("mch_id"));returnMap.put("nonce_str", response.get("nonce_str"));returnMap.put("sign", response.get("sign"));returnMap.put("total_fee", money);//resultCode 为SUCCESS，才会返回prepay_id和trade_typeif ("SUCCESS".equals(resultCode)) {//获取预支付交易回话标志returnMap.put("trade_type", response.get("trade_type"));returnMap.put("prepay_id", response.get("prepay_id"));return returnMap;} else {//此时返回没有预付订单的数据return returnMap;}} else {return returnMap;}} catch (Exception e) {System.out.println(e);//系统等其他错误的时候}return returnMap;}@Overridepublic String payBack(String notifyData) {MyWXPayConfig config = null;try {config = new MyWXPayConfig();} catch (Exception e) {e.printStackTrace();}WXPay wxpay = new WXPay(config);String xmlBack = "";Map<String, String> notifyMap = null;try {notifyMap = WXPayUtil.xmlToMap(notifyData);         // 调用官方SDK转换成map类型数据if (wxpay.isPayResultNotifySignatureValid(notifyMap)) {//验证签名是否有效，有效则进一步处理String return_code = notifyMap.get("return_code");//状态String out_trade_no = notifyMap.get("out_trade_no");//商户订单号String total_fee = notifyMap.get("total_fee");//支付金额if (return_code.equals("SUCCESS")) {if (out_trade_no != null) {log.info("支付成功");log.info("微信手机支付金额:{}", total_fee);log.info("微信手机支付回调成功订单号:{}", out_trade_no);// 注意特殊情况：订单已经退款，但收到了支付结果成功的通知，不应把商户的订单状态从退款改成支付成功// 注意特殊情况：微信服务端同样的通知可能会多次发送给商户系统，所以数据持久化之前需要检查是否已经处理过了，处理了直接返回成功标志//业务数据持久化//TODO 入账逻辑//TODO 入账逻辑//TODO 入账逻辑xmlBack = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>" + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";} else {log.info("微信手机支付回调失败订单号:{}", out_trade_no);xmlBack = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";}}return xmlBack;} else {// 签名错误，如果数据里没有sign字段，也认为是签名错误//失败的数据要不要存储？log.error("手机支付回调通知签名错误");xmlBack = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";return xmlBack;}} catch (Exception e) {log.error("手机支付回调通知失败", e);xmlBack = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";}return xmlBack;}

WXPayController：控制层

import com.alibaba.fastjson.JSONObject;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Map;@RestController
@RequestMapping("/wxPay")
@Api(value = "WeiXinPayController", tags = "微信下单支付")
public class WXPayController {@Autowiredprivate WXService wxService;/*** 统一下单*/@AccessAuth@PostMapping("/unifiedOrder")@ApiOperation(value = "微信下单")public CommonResult unifiedOrder(@RequestBody JSONObject param) throws Exception{// 获取下单金额BigDecimal moneyDecimal = param.getBigDecimal("money");if (moneyDecimal == null) {return CommonResult.failed("填写正确的下单金额");}String attach = "你需要传递的参数";//请求预支付订单Map<String, String> result = wxService.unifiedOrder(attach, moneyDecimal.toString());WxMD5Util md5Util = new WxMD5Util();//返回APP端的数据Map<String, String> map = new HashMap<>();map.put("appid", result.get("appid"));map.put("partnerid", result.get("mch_id"));map.put("prepayid", result.get("prepay_id"));map.put("package","Sign=WXPay");map.put("noncestr", result.get("nonce_str"));map.put("timestamp", String.valueOf(System.currentTimeMillis()/1000));map.put("sign", md5Util.getSign(map));map.put("extdata", attach);return CommonResult.success(map);}/*** 支付异步结果通知，我们在请求预支付订单时传入的地址*/@RequestMapping(value = "/wxPayNotify", method = {RequestMethod.GET, RequestMethod.POST})@ApiOperation(value = "微信支付回调接口")@Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.REPEATABLE_READ, rollbackFor = Exception.class)public String wxPayNotify(HttpServletRequest request, HttpServletResponse response) {String resXml;try {InputStream inputStream = request.getInputStream();//将InputStream转换成xmlStringBufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));StringBuilder sb = new StringBuilder();String line;try {while ((line = reader.readLine()) != null) {sb.append(line + "\n");}} catch (IOException e) {System.out.println(e.getMessage());} finally {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}resXml = sb.toString();String result = wxService.payBack(resXml);return result;} catch (Exception e) {System.out.println("微信手机支付失败:" + e.getMessage());String result = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>" + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";return result;}}
}


public class CommonResult<T> {private long code;private String message;private T data;protected CommonResult() {}protected CommonResult(long code, String message, T data) {this.code = code;this.message = message;this.data = data;}/*** 成功返回结果** @param data 获取的数据*/public static <T> CommonResult<T> success(T data) {return new CommonResult<T>(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getMessage(), data);}/*** 成功返回结果** @param data 获取的数据* @param  message 提示信息*/public static <T> CommonResult<T> success(T data, String message) {return new CommonResult<T>(ResultCode.SUCCESS.getCode(), message, data);}/*** 失败返回结果* @param message 提示信息*/public static <T> CommonResult<T> failed(String message) {return new CommonResult<T>(ResultCode.FAILED.getCode(), message, null);}/*** 成功返回结果** @param data 获取的数据* @param  message 提示信息*/public static <T> CommonResult<T> failed(T data, String message) {return new CommonResult<T>(ResultCode.FAILED.getCode(), message, data);}/*** 失败返回结果*/public static <T> CommonResult<T> failed() {return failed(ResultCode.FAILED);}public long getCode() {return code;}public void setCode(long code) {this.code = code;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public T getData() {return data;}public void setData(T data) {this.data = data;}
}

public enum ResultCode implements IErrorCode {SUCCESS(200, "操作成功"),FAILED(999999, "操作失败");private long code;private String message;private ResultCode(long code, String message) {this.code = code;this.message = message;}public long getCode() {return code;}public String getMessage() {return message;}
}

～有写错的或者有更优雅的写法记得@ 我～

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