Java 中 API 调用接口详解

一、API 调用的基本概念

API（Application Programming Interface）是应用程序之间的通信桥梁，允许开发者通过 HTTP 请求获取数据或执行操作。在 Java 中，API 调用通常涉及发送 HTTP 请求并处理响应。以下是几种常见的 API 调用方式及其代码示例。

二、使用 HttpURLConnection 调用 API

HttpURLConnection 是 Java 自带的类，适用于简单的 HTTP 请求和响应处理。

（一）GET 请求

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

public class HttpURLConnectionExample {
   
    public static void main(String[] args) {
   
        try {
   
            URL url = new URL("https://api.example.com/data");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "application/json");

            int responseCode = conn.getResponseCode();
            System.out.println("Response Code: " + responseCode);

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuilder response = new StringBuilder();
            while ((inputLine = in.readLine()) != null) {
   
                response.append(inputLine);
            }
            in.close();

            System.out.println("Response: " + response.toString());
        } catch (Exception e) <