Java后台实现微信支付和微信退款

Java后台实现微信支付和微信退款

微信支付流程

都是我自己工作中开发的，亲测可用，不喜勿喷。

controller中我是这么写的，你们需要根据自己的业务需求改动。ResponseBean是我自己封装的，你们可以改成你们想要的形式。

/**

* 微信统一下单接口

* @return

*/

@RequestMapping(value = "/doUnifiedOrder", method = RequestMethod.POST)

public ResponseBean doUnifiedOrder(@RequestBody Map req) {

Map resultMap=new HashMap();

String openid = (String) req.get("openId");

WXPay wxpay =null;

try {

//初始化证书

myConfig.initCert();

wxpay= new WXPay(myConfig);

} catch (Exception e) {

e.printStackTrace();

}

//生成的随机字符串

String nonce_str = WXPayUtil.generateNonceStr();

//获取客户端的ip地址

//获取本机的ip地址

InetAddress addr = null;

try {

addr = InetAddress.getLocalHost();

} catch (UnknownHostException e) {

e.printStackTrace();

}

//支付金额，需要转成字符串类型，否则后面的签名会失败

String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get("money")));

String tradeName = (String) req.get("tradeName");

if(tradeName!=null&&tradeName.length()>0){

}else{

tradeName = "课程支付";

}

String body = tradeName;

//商户订单号

String out_trade_no= WXPayUtil.generateNonceStr();

//统一下单接口参数

HashMap data = new HashMap();

data.put("appid", 你的appid);

data.put("mch_id", 商户id);

data.put("nonce_str", nonce_str);

data.put("body", body);

data.put("out_trade_no",out_trade_no);

data.put("total_fee", payOutMoney);

data.put("spbill_create_ip", "127.0.0.1");

data.put("notify_url", 回调地址);

data.put("trade_type","jsAPI");

data.put("openid", openid);

try {

Map rMap = wxpay.unifiedOrder(data);

String return_code = (String) rMap.get("return_code");

String result_code = (String) rMap.get("result_code");

String nonceStr = WXPayUtil.generateNonceStr();

resultMap.put("nonceStr", nonceStr);

Long timeStamp = System.currentTimeMillis() / 1000;

if ("SUCCESS".equals(return_code) && return_code.equals(result_code)) {

String prepayid = rMap.get("prepay_id");

resultMap.put("package", "prepay_id="+prepayid);

resultMap.put("signType", "MD5");

//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

resultMap.put("timeStamp", timeStamp + "");

//再次签名，这个签名用于小程序端调用wx.requesetPayment方法

resultMap.put("appId",myConfig.getAppID());

String sign = WXPayUtil.generateSignature(resultMap, myConfig.getKey());

resultMap.put("paySign", sign);

resultMap.put("out_trade_no",out_trade_no);

ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付",resultMap);

return responseBean;

}else{

ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失败","微信支付失败");

return responseBean;

}

} catch (Exception e) {

ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失败","微信支付失败");

e.printStackTrace();

return responseBean;

}

}

微信退款代码（需要传退款的订单id）

public ResponseBean refund(Map req) {

Map resultMap=new HashMap();

String buyId = (String) req.get("buyId");

WXPay wxpay =null;

try {

myConfig.initCert();//初始化证书

wxpay= new WXPay(myConfig);

} catch (Exception e) {

e.printStackTrace();

}

//生成的随机字符串

String nonce_str = WXPayUtil.generateNonceStr();

//获取客户端的ip地址

//获取本机的ip地址

InetAddress addr = null;

try {

addr = InetAddress.getLocalHost();

} catch (UnMFEHdknownHostException e) {

e.printStackTrace();

}

//支付金额，需要转成字符串类型，否则后面的签名会失败

// int total_fee= (int) req.get("money");

String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get("money")));

// String body = (String) req.get("z");

//商户订单号

String out_trade_no= WXPayUtil.generateNonceStr();

//统一下单接口参数

HashMap data = new HashMap();

try {

data.put("appid", myConfig.getAppID());

data.put("mch_id", myConfig.getMchID());

data.put("nonce_str", nonce_str);

data.put("sign_type", "MD5");

data.put("out_trade_no",buyId);//微信订单号

data.put("out_refund_no", out_trade_no);//商户退款单号

data.put("total_fee",payOutMoney);//支付金额，微信支付提交的金额是不能带小数点的，且是以分为单位,这边需要转成字符串类型，否则后面的签名会失败

data.put("refund_fee",payOutMoney);//退款总金额,订单总金额,单位为分,只能为整数

//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 sign = WXPayUtil.generateSignature(data, myConfig.getKey());

data.put("sign", sign);

Map rMap = wxpay.refund(data);

String return_code = (String) rMap.get("return_code");

String result_code = (String) rMap.get("result_code");

Long timeStamp = System.currentTimeMillis() / 1000;

if ("SUCCESS".equals(return_code) && return_code.equals(result_code)) {

ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款成功",rMap);

return responseBean;

}else{

ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款失败","微信支付失败");

return responseBean;

}

} catch (Exception e) {

ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款失败","微信支付失败");

e.printStackTrace();

return responseBean;

}

}

需要用到的工具类

然后在MyConfig中配置一下你们的小程序参数就行了，如果需要添加退款功能必须配置商户证书（对应在你项目中的位置）。不需要的话就把initCert方法去掉。

public class MyConfig extends WXPayConfig {

@Value("${res.imgPath}")

public String imgPath;

private byte[] certData;

@Override

public String getAppID() {

return "你的小程序id";

}

@Override

public String getMchID() {

return "商户id";

}

@Override

public String getKey() {

return "商户秘钥";

}

@Override

public InputStream getCertStream() {

ByteArrayInputStream certBis = new ByteArrayInputStream(this.certData);

return certBis;

}

@Override

public int getHttpConnectTimeoutMs() {

return 8000;

}

@Override

public int getHttpReadTimeoutMs() {

return 10000;

}

@Override

IWXPayDomain getWXPayDomain() {

return new IWXPayDomain() {

@Override

public void report(String domain, long elapsedTimeMillis, Exception ex) {

}

@Override

public DomainInfo getDomain(WXPayConfig cMFEHdonfig) {

return new DomainInfo("api.mch.weixin.qq.com", false);

}

};

}

@Override

public void initCert() throws Exception {

String certPath = this.imgPath+"/upload/cert/"+"apiclient_cert.p12";//从微信商户平台下载的安全证书存放的目录

System.out.println(certPath);

File file = new File(certPath);

InputStream certStream = new FileInputStream(file);

this.certData = new byte[(int) file.length()];

certStream.read(this.certData);

certStream.close();

}

}

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