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

package com.xx.wxpay;
 
import com.github.wxpay.sdk.WXPayConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
 
import java.io.InputStream;
 
/**
 * 描述：微信支付配置信息
 *
 * @author ssl
 * @create 2018/04/24 19:25
 */
@Component
public class WeWxConfig implements WXPayConfig {
  @Value("${wechat.public.appid}")
  private String appId;
  @Value("${wechat.merchant}")
  private String mchId;
  @Value("${wechat.public.apikey}")
  private String apiKey;
 
  /**
   * 公眾賬號ID:微信支付分配的公眾賬號ID（企業(yè)號corpid即為此appId）
   *
   * @return
   */
  @Override
  public String getAppID() {
    return appId;
  }
 
  /**
   * 商戶號:微信支付分配的商戶號
   *
   * @return
   */
  @Override
  public String getMchID() {
    return mchId;
  }
 
  /**
   * @return
   */
  @Override
  public String getKey() {
    return apiKey;
  }
 
  @Override
  public InputStream getCertStream() {
    return null;
  }
 
  @Override
  public int getHttpConnectTimeoutMs() {
    return 0;
  }
 
  @Override
  public int getHttpReadTimeoutMs() {
    return 0;
  }
}

package com.xx.wxpay;
 
import com.alibaba.fastjson.JSONObject;
import com.github.wxpay.sdk.WXPay;
import com.google.common.collect.Maps;
import com.xx.model.Order;
import com.xx.model.Product;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
 
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
 
/**
 * 描述：
 *
 * @author ssl
 * @create 2018/04/24 20:15
 */
@Service
public class WeWxPayService {
  protected Logger logger = LoggerFactory.getLogger(this.getClass());
  @Value("${project.url}")
  private String projectUrl;
  @Autowired
  private WeWxConfig weWxConfig;
 
 
  /**
   * 統(tǒng)一下單
   *
   * @param product
   * @param order
   * @return
   */
  public Map<String, String> unifiedOrder(Product product, Order order) {
    Map<String, String> data = Maps.newHashMap();
    WXPay wxpay = new WXPay(weWxConfig);
    data.put("body", "XX-" + product.getName());
    data.put("detail", "詳細信息");
    data.put("out_trade_no", order.getOrderNo());
    data.put("device_info", "WEB");
    data.put("fee_type", "CNY");
    data.put("total_fee", order.getAmount() + "");
    data.put("spbill_create_ip", "127.0.0.1");
    data.put("notify_url", projectUrl + "/base/order/notifyUrl");
    data.put("trade_type", "NATIVE"); // 此處指定為掃碼支付
    data.put("product_id", product.getId() + "");
    try {
      Map<String, String> resp = wxpay.unifiedOrder(data);
      logger.debug(JSONObject.toJSONString(resp));
      return resp;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }
 
  /**
   * 訂單查詢
   *
   * @param orderNo:訂單號
   * @return
   */
  public Map<String, String> orderQuery(String orderNo) {
    Map<String, String> reqData = Maps.newHashMap();
    reqData.put("out_trade_no", orderNo);
    WXPay wxpay = new WXPay(weWxConfig);
    try {
      Map<String, String> resp = wxpay.orderQuery(reqData);
      logger.debug(JSONObject.toJSONString(resp));
      return resp;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }
 
  public static String getUrl() {
    WXPay wxpay = new WXPay(new WeWxConfig());
    Map<String, String> data = new HashMap<String, String>();
    data.put("body", "上屏名稱");
    data.put("detail", "商品詳情");
    data.put("out_trade_no", "2ab9071b06b9f739b950ddb41db2690d");
    data.put("device_info", "");
    data.put("fee_type", "CNY");
    data.put("total_fee", "1");
    data.put("spbill_create_ip", "218.17.160.245");
    data.put("notify_url", "http://www.example.com/wxpay/notify");
    data.put("trade_type", "NATIVE"); // 此處指定為掃碼支付
    data.put("product_id", "12");
 
    try {
      Map<String, String> resp = wxpay.unifiedOrder(data);
      System.out.println(resp);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return "";
  }
}

/** 向微信支付系統(tǒng)下單，并得到二維碼返回給用戶 */
Map<String, String> resData = weWxPayService.unifiedOrder(product, order);