包含json数据的Java请求

import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class JsonRequestExample {
    public static void main(String[] args) {
        try {
            // 创建一个Java对象
            User user = new User("John Doe", 30);

            // 将Java对象转换为JSON字符串
            ObjectMapper objectMapper = new ObjectMapper();
            String jsonUser = objectMapper.writeValueAsString(user);

            // 创建URL对象
            URL url = new URL("https://api.example.com/user");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            // 设置请求方法和头部信息
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json; utf-8");
            conn.setRequestProperty("Accept", "application/json");
            conn.setDoOutput(true);

            // 发送JSON数据
            try (OutputStream os = conn.getOutputStream()) {
                byte[] input = jsonUser.getBytes("utf-8");
                os.write(input, 0, input.length);
            }

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

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class User {
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // Getters and setters
}