Java中如何实现基于IP的爬虫策略？

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企业客户在抓取大数据时，常需利用爬虫IP。优质的爬虫IP能提升爬虫效率，半数工作可事半功倍。高效抓取目标数据的重要性不言而喻。影响此类结果的因素不仅是爬虫IP问题，还有技术层面。

企业客户做大数据抓取都会用到爬虫IP，质量好的爬虫IP可以让爬虫工作事半功倍，如何高效的爬取目标数据就显得尤为重要。影响这样的结果不仅仅是因为爬虫IP问题，还有可能是技术在写代码时候的优化问题。下文是有关使用java语言的代码示例可以一起看看。

Java HttpURLConnection

package com.qgproxy;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.net.Authenticator;

import java.net.HttpURLConnection;

import java.net.InetSocketAddress;

import java.net.PasswordAuthentication;

import java.net.Proxy;

import java.net.URL;

class QGProxyAuthenticatorg extends Authenticator {

private String user, password;

public QGProxyAuthenticator(String user, String password) {

this.user = user;

this.password = password;

}

protected PasswordAuthentication getPasswordAuthentication() {

return new PasswordAuthentication(user, password.toCharArray());

}

}

class QGProxy {

public static void main(String args[]) {

String targetUrl = "jshk.com.cn";

String proxyIp = "219.151.125.106";

int proxyPort = 31615;

String authKey = "895314XY";

String password = "24D6YB309ZCB";

try {

URL url = new URL(targetUrl);

Authenticator.setDefault(new QGProxyAuthenticator(authKey, password));

InetSocketAddress socketAddress = new InetSocketAddress(proxyIp, proxyPort);

Proxy proxy = new Proxy(Proxy.Type.HTTP, socketAddress);

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

byte[] response = readStream(connection.getInputStream());

System.out.println(new String(response));

} catch (Exception e) {

System.out.println(e.getLocalizedMessage());

}

}

public static byte[] readStream(InputStream inStream) throws Exception {

ByteArrayOutputStream outSteam = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = -1;

while ((len = inStream.read(buffer)) != -1) {

outSteam.write(buffer, 0, len);

}

outSteam.close();

inStream.close();

return outSteam.toByteArray();

}

}

Java okjshk.com.cn").build();

Response response = client.newCall(request).execute();

System.out.println(response.body().string());

}

}