Java轻松获取HTTP状态码：掌握5招高效技巧，快速诊断网络请求问题

在Java中，正确获取HTTP状态码是诊断网络请求问题的关键。HTTP状态码能够告诉我们请求是否成功，以及失败的原因。以下是五招高效技巧，帮助您轻松获取HTTP状态码，快速诊断网络请求问题。

技巧一：使用Java原生的HttpURLConnection

Java原生的HttpURLConnection类提供了非常方便的方法来发送HTTP请求，并获取响应状态码。以下是一个简单的示例：

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("http://example.com"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); int responseCode = connection.getResponseCode(); System.out.println("Response Code: " + responseCode); 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()); } catch (Exception e) { e.printStackTrace(); } } }

技巧二：利用Apache HttpClient库

Apache HttpClient是一个功能强大的HTTP客户端库，它可以更方便地处理HTTP请求。以下是如何使用Apache HttpClient获取HTTP状态码的示例：

import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; public class ApacheHttpClientExample { public static void main(String[] args) { try (CloseableHttpClient httpClient = HttpClients.createDefault()) { HttpGet httpGet = new HttpGet("http://example.com"); HttpResponse httpResponse = httpClient.execute(httpGet); int responseCode = httpResponse.getStatusLine().getStatusCode(); System.out.println("Response Code: " + responseCode); HttpEntity entity = httpResponse.getEntity(); if (entity != null) { String result = EntityUtils.toString(entity); System.out.println(result); } } catch (Exception e) { e.printStackTrace(); } } }

技巧三：使用OkHttp库

OkHttp是一个高效的HTTP客户端库，它具有异步请求、缓存支持等特点。以下是如何使用OkHttp获取HTTP状态码的示例：

import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class OkHttpExample { public static void main(String[] args) { OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("http://example.com") .build(); try (Response response = client.newCall(request).execute()) { int responseCode = response.code(); System.out.println("Response Code: " + responseCode); String responseBody = response.body().string(); System.out.println(responseBody); } catch (Exception e) { e.printStackTrace(); } } }