java headers设置代理

在Java中，如果你需要设置HTTP请求头（Headers）并通过代理服务器发送网络请求，通常是在`java.net.HttpURLConnection`或者第三方库如Apache HttpClient中操作。这里是一个例子，展示如何使用`HttpURLConnection`设置代理：

import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.URL;

public class ProxyExample {

    public static void main(String[] args) throws Exception {
        URL url = new URL("http://example.com");
        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("your-proxy-host", your-proxy-port)); // 替换为你的代理主机和端口

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setUseCaches(false); // 关闭缓存，避免影响代理设置
        connection.setRequestProperty("User-Agent", "Mozilla/5.0"); // 添加请求头，根据实际需求可能还需要其他header
        connection.setRequestProperty("Accept-Language", "en-US,en;q=0.5"); // 可选，设置请求接受的语言
        connection.setConnectTimeout(5000); // 设置连接超时时间

        // 通过proxy设置连接
        connection.setProxy(proxy);

        // 打开连接并执行请求
        connection.connect();

        // ... 这里处理响应，比如读取输入流
        System.out.println(connection.getResponseCode());
        connection.disconnect();
    }
}

同样，如果你使用的是Apache HttpClient，设置会有所不同：

import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class HttpClientProxyExample {

    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        RequestConfig config = RequestConfig.custom()
            .setProxy(new HttpHost("your-proxy-host", your-proxy-port))
            .build();

        HttpGet httpGet = new HttpGet("http://example.com");
        httpGet.setHeader("User-Agent", "Mozilla/5.0");

        CloseableHttpResponse response = httpClient.execute(httpGet, config);
        try {
            String responseBody = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
            System.out.println(responseBody);
        } finally {
            response.close();
            httpClient.close();
        }
    }
}

请注意，`your-proxy-host`和`your-proxy-port`应替换为你实际使用的代理服务器的主机名和端口号。同时，确保你的代理支持HTTPS（如果是用于HTTPS请求），或者开启透明代理功能。