生成微信支付二维码接口.png

一、准备阶段

需要提前准备好一下事情

weixin:
  pay:
    #关联的公众号appid
    appid: wx74862e0dfcf695956
    #商户号
    partner: 155000000
    #商户key
    partnerkey: T6m9iK73b0kn9g5v426MKfHQH7X8rKwb
    #回调地址
    notifyurl: http://guli.shop/api/order/weixinPay/weixinNotify

二、添加依赖

添加微信支付开发依赖

<dependencies>
        <dependency>
            <groupId>com.github.wxpay</groupId>
            <artifactId>wxpay-sdk</artifactId>
            <version>0.0.3</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
        </dependency>
    </dependencies>

三、编写代码

调用微信支付接口如下代码

public class PayLogServiceImpl implements PayLogService {
    @Autowired
    private PayLogMapper payLogMapper;
    @Autowired
    private OrderMapper orderMapper;

    /**
     * 【生成二维码接口】
     *
     * @author caiweiwei
     * @date 2021/6/9 9:47
     */
    public Map createNative(String orderNo) {
        try {
            //根据订单
            Order order = orderMapper.getOrderInfoByOrderNo(orderNo);
            //2 使用map设置生成二维码需要参数
            Map m = new HashMap();
            m.put("appid", "wx74862e0dfcf69954");
            m.put("mch_id", "1558950191");
            m.put("nonce_str", WXPayUtil.generateNonceStr());
            m.put("body", order.getCourseTitle()); //课程标题
            m.put("out_trade_no", orderNo); //订单号
            m.put("total_fee", order.getTotalFee().multiply(new BigDecimal("100")).longValue() + "");//价格
            m.put("spbill_create_ip", "127.0.0.1");
            m.put("notify_url", "http://guli.shop/api/order/weixinPay/weixinNotify\n");
            m.put("trade_type", "NATIVE");

            //3 发送httpclient请求，传递参数xml格式，微信支付提供的固定的地址
            HttpClient client = new HttpClient("https://api.mch.weixin.qq.com/pay/unifiedorder");
            //设置xml格式的参数
            client.setXmlParam(WXPayUtil.generateSignedXml(m, "T6m9iK73b0kn9g5v426MKfHQH7X8rKwb"));
            client.setHttps(true);
            //执行post请求发送
            client.post();

            //4 得到发送请求返回结果
            //返回内容，是使用xml格式返回
            String xml = client.getContent();
            
            //把xml格式转换map集合，把map集合返回
            Map<String, String> resultMap = WXPayUtil.xmlToMap(xml);
            //最终返回数据 的封装
            Map map = new HashMap();
            map.put("out_trade_no", orderNo);
            map.put("course_id", order.getCourseId());
            map.put("total_fee", order.getTotalFee());
            map.put("result_code", resultMap.get("result_code"));  //返回二维码操作状态码
            map.put("code_url", resultMap.get("code_url"));        //二维码地址

            return map;
        } catch (Exception e) {
            throw new GuliException(20001, "生成二维码失败");
        }

    }

当生成二维码之后需要需要调用接口进行查询是否支付成功,代码如下
controller代码

 /**
     * 【查询订单支付状态】
     *
     * @author caiweiwei
     * @date 2021/6/13 15:03
     */
    @GetMapping("queryPayStatus/{orderNo}")
    public R queryPayStatus(@PathVariable String orderNo) {
        Map<String,String> map = payLogService.queryPayStatus(orderNo);
        System.out.println("*****查询订单状态map集合:"+map);
        if(map == null) {
            return R.error().message("支付出错了");
        }
        //如果返回map里面不为空，通过map获取订单状态
        if(map.get("trade_state").equals("SUCCESS")) {//支付成功
            //添加记录到支付表，更新订单表订单状态
            payLogService.updateOrdersStatus(map);
            return R.ok().message("支付成功");
        }
        return R.ok().code(25000).message("支付中");
    }

service层代码

 /**
     * 【查询订单是否支付成功】
     *
     * @author caiweiwei
     * @date 2021/6/13 16:21
     */
    @Override
    public Map<String, String> queryPayStatus(String orderNo) {
        try {
            //1、封装参数
            Map m = new HashMap<>();
            m.put("appid", "wx74862e0dfcf69954");
            m.put("mch_id", "1558950191");
            m.put("out_trade_no", orderNo);
            m.put("nonce_str", WXPayUtil.generateNonceStr());

            //2 发送httpclient
            HttpClient client = new HttpClient("https://api.mch.weixin.qq.com/pay/orderquery");
            client.setXmlParam(WXPayUtil.generateSignedXml(m, "T6m9iK73b0kn9g5v426MKfHQH7X8rKwb"));
            client.setHttps(true);
            client.post();

            //3 得到请求返回内容
            String xml = client.getContent();
            Map<String, String> resultMap = WXPayUtil.xmlToMap(xml);
            //6、转成Map再返回
            return resultMap;
        } catch (Exception e) {
            return null;
        }
    }
 /**
     * 【 添加支付记录和更新订单状态】
     *
     * @author caiweiwei
     * @date 2021/6/13 16:25
     */
    @Override
    public void updateOrdersStatus(Map<String, String> map) {
        //从map获取订单号
        String orderNo = map.get("out_trade_no");
        Order order = orderMapper.getOrderInfoByOrderNo(orderNo);

        //更新订单表订单状态
        if(order.getStatus().intValue() == 1) { return; }
        order.setStatus(1);//1代表已经支付
        orderMapper.updateById(order);

        //向支付表添加支付记录
        PayLog payLog = new PayLog();
        payLog.setOrderNo(orderNo);  //订单号
        payLog.setPayTime(new Date()); //订单完成时间
        payLog.setPayType(1);//支付类型 1微信
        payLog.setTotalFee(order.getTotalFee());//总金额(分)

        payLog.setTradeState(map.get("trade_state"));//支付状态
        payLog.setTransactionId(map.get("transaction_id")); //流水号
        payLog.setAttr(JSONObject.toJSONString(map));
        payLogMapper.savePayLog(payLog);

    }

在查看是否支付成功时,前端可以写定时器进行查询,代码如下

<template>
  <div class="cart py-container">
    <!--主内容-->
    <div class="checkout py-container  pay">
      <div class="checkout-tit">
        <h4 class="fl tit-txt"><span class="success-icon"></span><span class="success-info">订单提交成功，请您及时付款！订单号：{{payObj.out_trade_no}}</span>
        </h4>
        <span class="fr"><em class="sui-lead">应付金额：</em><em class="orange money">￥{{payObj.total_fee}}</em></span>
        <div class="clearfix"></div>
      </div>
      <div class="checkout-steps">
        <div class="fl weixin">微信支付</div>
        <div class="fl sao">
          <p class="red">请使用微信扫一扫。</p>
          <div class="fl code">
            <!-- <img id="qrious" src="~/assets/img/erweima.png" alt=""> -->
            <!-- <qriously value="weixin://wxpay/bizpayurl?pr=R7tnDpZ" :size="338"/> -->
            <qriously :value="payObj.code_url" :size="338"/>
            <div class="saosao">
              <p>请使用微信扫一扫</p>
              <p>扫描二维码支付</p>
            </div>

          </div>

        </div>
        <div class="clearfix"></div>
        <!-- <p><a href="pay.html" target="_blank">> 其他支付方式</a></p> -->

      </div>
    </div>
  </div>
</template>
<script>
  import ordersApi from '@/api/orders'
  export default {
    asyncData({ params, error }) {
      return ordersApi.createNatvie(params.pid)
        .then(response => {
          return {
            payObj: response.data.data
          }
        })
    },
    data() {
      return {
        timer1:''
      }
    },
    //每隔三秒调用一次查询订单状态的方法
    mounted() {//页面渲染之后执行
      this.timer1 = setInterval(() => {
        this.queryOrderStatus(this.payObj.out_trade_no)
      },3000);
    },
    methods:{
      queryOrderStatus(orderNo) {
        ordersApi.queryPayStatus(orderNo)
          .then(response => {
            if (response.data.success) {
              //支付成功，清除定时器
              clearInterval(this.timer1)
              //提示
              this.$message({
                type: 'success',
                message: '支付成功!'
              })
              //跳转回到课程详情页面
              this.$router.push({path: '/course/' + this.payObj.course_id})
            }
          })
      }
    }
  }
</script>

使用的HttpClient工具类代码如下:

package com.caiweiwei.eduorder.utils;

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContextBuilder;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.text.ParseException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * http请求客户端
 * 
 * @author qy
 * 
 */
public class HttpClient {
    private String url;
    private Map<String, String> param;
    private int statusCode;
    private String content;
    private String xmlParam;
    private boolean isHttps;

    public boolean isHttps() {
        return isHttps;
    }

    public void setHttps(boolean isHttps) {
        this.isHttps = isHttps;
    }

    public String getXmlParam() {
        return xmlParam;
    }

    public void setXmlParam(String xmlParam) {
        this.xmlParam = xmlParam;
    }

    public HttpClient(String url, Map<String, String> param) {
        this.url = url;
        this.param = param;
    }

    public HttpClient(String url) {
        this.url = url;
    }

    public void setParameter(Map<String, String> map) {
        param = map;
    }

    public void addParameter(String key, String value) {
        if (param == null)
            param = new HashMap<String, String>();
        param.put(key, value);
    }

    public void post() throws ClientProtocolException, IOException {
        HttpPost http = new HttpPost(url);
        setEntity(http);
        execute(http);
    }

    public void put() throws ClientProtocolException, IOException {
        HttpPut http = new HttpPut(url);
        setEntity(http);
        execute(http);
    }

    public void get() throws ClientProtocolException, IOException {
        if (param != null) {
            StringBuilder url = new StringBuilder(this.url);
            boolean isFirst = true;
            for (String key : param.keySet()) {
                if (isFirst)
                    url.append("?");
                else
                    url.append("&");
                url.append(key).append("=").append(param.get(key));
            }
            this.url = url.toString();
        }
        HttpGet http = new HttpGet(url);
        execute(http);
    }

    /**
     * set http post,put param
     */
    private void setEntity(HttpEntityEnclosingRequestBase http) {
        if (param != null) {
            List<NameValuePair> nvps = new LinkedList<NameValuePair>();
            for (String key : param.keySet())
                nvps.add(new BasicNameValuePair(key, param.get(key))); // 参数
            http.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8)); // 设置参数
        }
        if (xmlParam != null) {
            http.setEntity(new StringEntity(xmlParam, Consts.UTF_8));
        }
    }

    private void execute(HttpUriRequest http) throws ClientProtocolException,
            IOException {
        CloseableHttpClient httpClient = null;
        try {
            if (isHttps) {
                SSLContext sslContext = new SSLContextBuilder()
                        .loadTrustMaterial(null, new TrustStrategy() {
                            // 信任所有
                            public boolean isTrusted(X509Certificate[] chain,
                                    String authType)
                                    throws CertificateException {
                                return true;
                            }
                        }).build();
                SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                        sslContext);
                httpClient = HttpClients.custom().setSSLSocketFactory(sslsf)
                        .build();
            } else {
                httpClient = HttpClients.createDefault();
            }
            CloseableHttpResponse response = httpClient.execute(http);
            try {
                if (response != null) {
                    if (response.getStatusLine() != null)
                        statusCode = response.getStatusLine().getStatusCode();
                    HttpEntity entity = response.getEntity();
                    // 响应内容
                    content = EntityUtils.toString(entity, Consts.UTF_8);
                }
            } finally {
                response.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            httpClient.close();
        }
    }

    public int getStatusCode() {
        return statusCode;
    }

    public String getContent() throws ParseException, IOException {
        return content;
    }

}