微信小程序v3统一下单java后台代码
时间: 2023-03-19 15:21:27 浏览: 183
微信小程序v3的统一下单接口需要在Java后台代码中实现,以下是一个简单的示例代码:
```java
import java.util.HashMap;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
public class WechatPayUtils {
private static final String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi";
private static final String MCH_ID = "your_mch_id"; // 商户号
private static final String MCH_PRIVATE_KEY = "your_mch_private_key"; // 商户私钥
private static final String SERIAL_NO = "your_serial_no"; // 商户证书序列号
private static final String API_V3_KEY = "your_api_v3_key"; // APIv3密钥
/**
* 发起微信支付下单请求
* @param openid 用户的openid
* @param totalFee 订单总金额,单位为分
* @param outTradeNo 商户订单号
* @param body 商品描述
* @param notifyUrl 接收微信支付异步通知回调地址
* @return JSONObject 包含下单结果的JSON对象
* @throws Exception
*/
public static JSONObject makeUnifiedOrder(String openid, int totalFee, String outTradeNo, String body, String notifyUrl) throws Exception {
SortedMap<String, Object> paramMap = new TreeMap<>();
paramMap.put("appid", "your_appid"); // 小程序appid
paramMap.put("mchid", MCH_ID);
paramMap.put("description", body);
paramMap.put("out_trade_no", outTradeNo);
paramMap.put("notify_url", notifyUrl);
paramMap.put("amount", getAmountMap(totalFee));
paramMap.put("payer", getPayerMap(openid));
paramMap.put("sign_type", "RSA");
// 生成签名
String sign = generateSignature(JSON.toJSONString(paramMap), MCH_PRIVATE_KEY);
// 设置请求头
Map<String, String> headers = new HashMap<>();
headers.put("Accept", "application/json");
headers.put("Content-Type", "application/json");
headers.put("Authorization", getAuthorizationHeader(sign));
// 发送POST请求
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(UNIFIED_ORDER_URL);
for (Map.Entry<String, String> entry : headers.entrySet()) {
httpPost.setHeader(entry.getKey(), entry.getValue());
}
httpPost.setEntity(new StringEntity(JSON.toJSONString(paramMap)));
CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
// 解析响应结果
JSONObject result = JSON.parseObject(EntityUtils.toString(httpResponse.getEntity()));
return result;
}
/**
* 获取订单金额信息
* @param totalFee 订单总金额,单位为分
* @return 包含订单金额信息的Map对象
*/
private static Map<String, Object> getAmountMap(int totalFee) {
Map<String, Object> amountMap = new HashMap<>();
amountMap.put("total", totalFee);
amountMap.put("currency", "CNY");
return amountMap;
}