通过Java实现HTTP请求与响应的基本步骤实例-蒲公英云

通过Java实现HTTP请求与响应的基本步骤实例

在Java中，我们可以使用java.net包中的类来发送HTTP请求和接收响应。以下是一个基本的步骤实例：

导入所需的类：

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

创建一个方法来发送GET请求：

public String sendGetRequest(String url) throws Exception {
 HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
 connection.setRequestMethod("GET");
 int responseCode = connection.getResponseCode();
 if (responseCode == 200) { // Success
     BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()))));
     StringBuilder responseContent = new StringBuilder();
     String line;
     while ((line = br.readLine()) != null) {
         responseContent.append(line);
     }
     br.close();
     return responseContent.toString(); // Return the content
 } else { // Error or not a GET request
     throw new Exception("Error occurred during HTTP GET request. Response Code: " + responseCode);
 }
}

使用这个方法来发送GET请求并获取响应内容：

public void sendGetRequestAndPrintResponse(String url) throws Exception {
 String response = sendGetRequest(url);
 if (response != null && !response.isEmpty()) { // Response received and not empty
     System.out.println("Received Response from URL: " + url);
     System.out.println("Response Content: " + response);
 } else { // No response or response is empty
     System.out.println("No Response Received from URL: " + url);
 }
}