java如何调用别的项目接口

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要调用另一个项目的接口，可以使用 Java 中的 HTTP 客户端库来发送 HTTP 请求和接收响应。以下是一个简单的示例代码，演示如何使用 Java 中的 HttpURLConnection 来调用另一个项目的接口：

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

public class ApiClient {public static void main(String[] args) {try {URL url = new URL("http://api.example.com/some-endpoint");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");

            // 设置请求头 
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setRequestProperty("Authorization", "Bearer your_access_token");

            // 发起请求 
            int responseCode = connection.getResponseCode();

            if (responseCode == HttpURLConnection.HTTP_OK) {BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String inputLine;
                StringBuffer response = new StringBuffer();

                while ((inputLine = in.readLine()) != null) {response.append(inputLine);
                }

                in.close();

                System.out.println(response.toString());
            } else {System.out.println("Failed to call API. Response code: " + responseCode);
            }

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