用JAVA代码实现HTTP GET

在Java中，我们可以使用HttpURLConnection或者更现代的HttpClient库来发送HTTP GET请求。以下是使用HttpURLConnection的一个简单示例：

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

public class HttpGetExample {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("http://example.com/api/resource");

            // 打开连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");  // 设置请求方法为GET

            // 添加请求头，如需要身份验证
            connection.setRequestProperty("Authorization", "Bearer your_token");
            connection.setRequestProperty("Accept", "application/json");  // 设置接受内容类型

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

            if (responseCode == HttpURLConnection.HTTP_OK) {  // 确保请求成功
                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String inputLine;
                StringBuffer content = new StringBuffer();

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

                // 输出响应数据
                System.out.println(content.toString());
            } else {
                System.out.println("Request failed with status code " + responseCode);
            }

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