如何自定义java requests的请求头

要自定义Java requests的请求头，可以使用URLConnection或HttpClient来发送HTTP请求，并设置请求头。以下是使用URLConnection和HttpClient分别自定义请求头的示例代码：

使用URLConnection自定义请求头：

import java.net.HttpURLConnection;import java.net.URL;public class CustomRequestHeader {    public static void main(String[] args) {        try {            URL url = new URL("https://api.example.com");            HttpURLConnection conn = (HttpURLConnection) url.openConnection();                        // 设置请求头            conn.setRequestProperty("Authorization", "Bearer token");            conn.setRequestProperty("Content-Type", "application/json");                        // 发送请求            conn.setRequestMethod("GET");            int responseCode = conn.getResponseCode();                        System.out.println("Response Code: " + responseCode);        } catch (Exception e) {            e.printStackTrace();        }    }}

使用HttpClient自定义请求头：

import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.HttpClientBuilder;public class CustomRequestHeader {    public static void main(String[] args) {        try {            HttpClient httpClient = HttpClientBuilder.create().build();            HttpGet httpGet = new HttpGet("https://api.example.com");                        // 设置请求头            httpGet.addHeader("Authorization", "Bearer token");            httpGet.addHeader("Content-Type", "application/json");                        // 发送请求            HttpResponse response = httpClient.execute(httpGet);                        System.out.println("Response Code: " + response.getStatusLine().getStatusCode());        } catch (Exception e) {            e.printStackTrace();        }    }}

以上代码示例分别使用URLConnection和HttpClient发送HTTP请求，并设置了Authorization和Content-Type两个自定义请求头。你可以根据需要自定义更多的请求头参数。