JAVA Response 返回值再拿

在Java中，当你需要从Response对象中获取返回值时，可以使用以下方法：

1. 首先，确保你已经导入了相关的库。例如，如果你使用的是java.net.HttpURLConnection，则需要导入以下包：

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

2. 创建一个方法来发送HTTP请求并获取响应：

public static String sendGetRequest(String urlString) throws Exception {
    URL url = new URL(urlString);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod("GET");

    int responseCode = connection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_OK) {
        BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String inputLine;
        StringBuilder content = new StringBuilder();
        while ((inputLine = in.readLine()) != null) {
            content.append(inputLine);
        }
        in.close();
        connection.disconnect();
        return content.toString();
    } else {
        throw new Exception("Failed to get response from the server. Response code: " + responseCode);
    }
}

3. 调用该方法并传入URL字符串以获取响应内容：

public static void main(String[] args) {
    try {
        String url = "https://api.example.com/data";
        String response = sendGetRequest(url);
        System.out.println("Response: " + response);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

这样，你就可以从Response对象中获取返回值了。注意，这里的示例仅适用于GET请求。如果你需要处理其他类型的HTTP请求（如POST、PUT等），你需要对代码进行相应的修改。