java post请求获取接口数据

在Java中，发送POST请求并获取接口数据通常涉及使用`HttpURLConnection`、`HttpClient`或者第三方库如`Apache HttpClient`或`OkHttp`。这里以`HttpURLConnection`为例来解释：

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

public class PostRequestExample {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("http://your-api-url.com/endpoint");

            // 打开连接，并设置请求方法为POST
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setDoOutput(true); // 指示需要向服务器发送数据

            // 设置请求头（如果有特定认证或内容类型）
            connection.setRequestProperty("Content-Type", "application/json"); // 如果接口接受JSON
            // 添加请求体（例如JSON对象）
            String requestBody = "{\"key\":\"value\"}";
            byte[] requestBodyBytes = requestBody.getBytes("UTF-8");
            connection.getOutputStream().write(requestBodyBytes);

            // 获取响应码（成功状态通常是200）
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code: " + responseCode);

            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 从输入流读取响应数据
                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                StringBuilder response = new StringBuilder();
                String inputLine;
                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();

                // 打印返回的数据
                System.out.println("Response Data: " + response.toString());
            } else {
                throw new RuntimeException("Failed : HTTP error code : " + responseCode);
            }

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