Java实现动态IP代理的步骤详解

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

public class DynamicProxyExample {
    public static void main(String[] args) {
        // 定义多个代理IP
        String[] proxyList = {
            "123.456.78.90:8080",
            "98.765.43.21:8080",
            "111.222.33.44:8080"
        };

        // 随机选择一个代理
        Random random = new Random();
        String selectedProxy = proxyList[random.nextInt(proxyList.length)];
        String[] proxyParts = selectedProxy.split(":");

        // 设置代理
        System.setProperty("http.proxyHost", proxyParts[0]);
        System.setProperty("http.proxyPort", proxyParts[1]);
        System.setProperty("https.proxyHost", proxyParts[0]);
        System.setProperty("https.proxyPort", proxyParts[1]);

        // 发送请求
        sendRequest();
    }

    private static void sendRequest() {
        try {
            URL url = new URL("http://httpbin.org/ip");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");

            // 获取响应
            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String inputLine;
                StringBuilder response = new StringBuilder();

                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();

                // 打印响应内容
                System.out.println("响应内容: " + response.toString());
            } else {
                System.out.println("请求失败，响应代码: " + responseCode);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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

public class ProxyFetcher {
    public static void main(String[] args) {
        try {
            // 从外部API获取代理列表
            URL url = new URL("http://api.example.com/get_proxies");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String inputLine;
            StringBuilder response = new StringBuilder();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            // 假设API返回的是以逗号分隔的IP列表
            String[] proxyList = response.toString().split(",");

            // 随机选择一个代理
            Random random = new Random();
            String selectedProxy = proxyList[random.nextInt(proxyList.length)];
            System.out.println("选择的代理: " + selectedProxy);
            
            // 继续设置代理并发送请求...
            
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}