Java中實(shí)現(xiàn)動(dòng)態(tài)轉(zhuǎn)發(fā)代理IP

在Java中實(shí)現(xiàn)動(dòng)態(tài)轉(zhuǎn)發(fā)代理IP並不複雜，通?？梢酝ㄟ^(guò)一些開(kāi)源庫(kù)和框架來(lái)實(shí)現(xiàn)。下麵是一個(gè)簡(jiǎn)單的實(shí)現(xiàn)思路：

設(shè)置HTTP請(qǐng)求：在Java中，可以使用HttpURLConnection或Apache HttpClient來(lái)發(fā)送HTTP請(qǐng)求。在發(fā)送請(qǐng)求時(shí)，可以通過(guò)設(shè)置Proxy對(duì)象來(lái)使用代理IP。

動(dòng)態(tài)切換IP：在每次請(qǐng)求前，從IP池中隨機(jī)選擇一個(gè)IP作為代理。如果請(qǐng)求失敗，可以實(shí)現(xiàn)一個(gè)重試機(jī)制，換用其他IP重新發(fā)送請(qǐng)求。

實(shí)現(xiàn)代碼示例：

import?java.net.HttpURLConnection;import?java.net.InetSocketAddress;import?java.net.Proxy;import?java.net.URL;import?java.util.List;import?java.util.Random;

public?class?DynamicProxyExample?{

????private?static?List<String> proxyList = List.of(

????????"192.168.1.1:8080",

????????"192.168.1.2:8080",

????????"192.168.1.3:8080"

????);

????public?static?void?main(String[] args)?{

????????try?{

????????String?targetUrl?=?"http://example.com";

???????????????String?response?=?sendRequestWithDynamicProxy(targetUrl);

???????????????System.out.println(response);

???????????} catch?(Exception e) {

???????????????e.printStackTrace();

???????????}

???????}

???????private?static?String sendRequestWithDynamicProxy(String targetUrl)?throws?Exception {

???????????// 隨機(jī)選擇一個(gè)代理IP

???????????String?proxyAddress?=?proxyList.get(new?Random().nextInt(proxyList.size()));

???????????String[] parts = proxyAddress.split(":");

???????????String?ip?=?parts[0];

???????????int?port?=?Integer.parseInt(parts[1]);

???????????// 設(shè)置代理

???????????Proxy?proxy?=?new?Proxy(Proxy.Type.HTTP, new?InetSocketAddress(ip, port));

???????????URL?url?=?new?URL(targetUrl);

???????????HttpURLConnection?connection?=?(HttpURLConnection) url.openConnection(proxy);

???????????// 設(shè)置請(qǐng)求屬性

???????????connection.setRequestMethod("GET");

???????????connection.setConnectTimeout(5000);

???????????connection.setReadTimeout(5000);

???????????// 獲取回應(yīng)

???????????int?responseCode?=?connection.getResponseCode();

???????????if?(responseCode == HttpURLConnection.HTTP_OK) {

???????????????try?(BufferedReader?in?=?new?BufferedReader(new?InputStreamReader(connection.getInputStream()))) {

???????????????????StringBuilder?response?=?new?StringBuilder();

???????????????????String inputLine;

???????????????????while?((inputLine = in.readLine()) != null) {

???????????????????????response.append(inputLine);

???????????????????}

???????????????????return?response.toString();

???????????????}

???????????} else?{

???????????????throw?new?RuntimeException("Failed to connect: "?+ responseCode);

???????????}

???????}

???}