使用JSON的Java HTTP POST请求

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.JSONObject;

public class JsonHttpPostExample {
    public static void main(String[] args) {
        try {
            // 构建JSON对象
            JSONObject json = new JSONObject();
            json.put("name", "John");
            json.put("age", 25);

            // 创建HTTP连接
            URL url = new URL("http://example.com/api"); // 服务器地址
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");

            // 设置请求头
            conn.setRequestProperty("Content-Type", "application/json");

            // 设置请求体
            OutputStream os = conn.getOutputStream();
            os.write(json.toString().getBytes("UTF-8"));
            os.flush();

            // 发送请求
            int responseCode = conn.getResponseCode();

            // 处理响应
            if (responseCode == HttpURLConnection.HTTP_OK) {
                BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
                String line;
                StringBuilder response = new StringBuilder();
                while ((line = br.readLine()) != null) {
                    response.append(line);
                }
                br.close();

                // 解析JSON响应数据
                JSONObject jsonResponse = new JSONObject(response.toString());
                // 处理响应数据
            } else {
                // 处理错误情况
            }

            // 断开连接
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}