java调用http接口post请求

可以使用Java自带的HttpURLConnection类来发送POST请求，以下是示例代码：

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;

public class HttpPostExample {

    public static void main(String[] args) throws Exception {

        String url = "https://example.com/api"; // 请求的URL地址

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        
        // 设置请求方法为POST
        con.setRequestMethod("POST");

        // 设置请求头部信息
        con.setRequestProperty("Content-Type", "application/json");
        con.setRequestProperty("User-Agent", "Java client");

        // 设置请求体内容
        String requestBody = "{\"key\":\"value\"}";
        byte[] requestBodyBytes = requestBody.getBytes(StandardCharsets.UTF_8);

        // 发送POST请求
        con.setDoOutput(true);
        try (OutputStream os = con.getOutputStream()) {
            os.write(requestBodyBytes, 0, requestBodyBytes.length);
        }

        // 获取响应码
        int responseCode = con.getResponseCode();
        System.out.println("Response Code : " + responseCode);

        // 读取响应内容
        try (BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
            String inputLine;
            StringBuilder response = new StringBuilder();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            System.out.println("Response Body : " + response.toString());
        }
    }
}

需要替换以下部分来适配你的请求：

- 将`url`变量的值替换为实际请求的URL地址。
- 将`Content-Type`请求头和请求体的内容替换为实际的值。