java 调用微信发红包接口

<!-- HttpClient 用于发送HTTP请求 -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>
<!-- JSON处理库 -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.3</version>
</dependency>

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 org.apache.http.util.EntityUtils;
import com.fasterxml.jackson.databind.ObjectMapper;
// ...
// 初始化HttpClient
CloseableHttpClient httpClient = HttpClients.createDefault();
// 设置请求URL（根据你的微信支付配置设置）
String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
// 构造请求参数（使用Jackson库来生成JSON）
ObjectMapper mapper = new ObjectMapper();
Map<String, String> params = new HashMap<>();
params.put("appid", "wx2421b1c4370ec43b");  // 微信分配的公众号ID
params.put("mch_id", "10000100");         // 微信支付分配的商户号
params.put("nonce_str", "ec2316275641faa3aacf3cc599e8730f"); // 随机字符串，不长于32位
params.put("body", "JSAPI支付");           // 商品描述
params.put("out_trade_no", "1415659990"); // 商户系统内部订单号
params.put("total_fee", "1");             // 订单总金额，单位为分
params.put("spbill_create_ip", "8.8.8.8"); // 用户端IP
params.put("notify_url", "http://www.weixin.qq.com/wxpay/pay.php"); // 异步接收微信支付结果通知的回调地址
params.put("trade_type", "JSAPI");        // 交易类型
// 将请求参数转换为JSON字符串
String jsonString = mapper.writeValueAsString(params);
// 创建HttpPost请求
HttpPost post = new HttpPost(url);
post.setEntity(new StringEntity(jsonString, "UTF-8"));
post.setHeader("Content-Type", "application/json");
// 发起请求
CloseableHttpResponse response = httpClient.execute(post);
// 处理响应
if (response.getStatusLine().getStatusCode() == 200) {
    String result = EntityUtils.toString(response.getEntity(), "UTF-8");
    System.out.println(result);
} else {
    System.out.println("请求失败");
}
// 关闭资源
response.close();
httpClient.close();