弹幕java_120行JAVA代码实现爱奇艺的弹幕下载

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package com.huqitong.spiderdanmu;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.text.NumberFormat;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import java.util.zip.InflaterInputStream;

import org.apache.http.HttpEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

import com.alibaba.fastjson.JSONObject;

public class SpiderAiqiyiDanMu {

public static void main(String[] args) {

String url = "http://www.iqiyi/v_19rrmm2vbk.html";

List res = getDanMu(url);

for (String r : res) {

System.out.println(r);

}

}

public static List getDanMu(String url) {

//获取电影或者电视剧的tvId

String res = httpGetRequest(url, false);

String REGEX = "tvId:(.+?),";

Pattern p = Patternpile(REGEX);

Matcher m = p.matcher(res);

String tvId = "";

if (m.find()) {

tvId = m.group(1);

} else {

return null;

}

// 根据tvId获取电影或者电视剧的详细信息。

String infoUrl = "http://mixer.video.iqiyi/jp/mixin/videos/" + tvId;

String info = httpGetRequest(infoUrl, false);

info = info.replace("var tvInfoJs=", "");

JSONObject jsonObject = JSONObject.parseObject(info);

// 电影或电视剧专辑

String albumId = jsonObject.getString("albumId");

// 电影或电视剧频道

String channelId = jsonObject.getString("channelId");

// 电影或电视剧时长

int duration = jsonObject.getIntValue("duration");

return getDanMu(tvId, albumId, channelId, duration);

}

private static List getDanMu(String tvId, String albumId, String channelId, int duration) {

// 弹幕下载地址

String IQIYI_GET_DANMU_URL = "http://cmts.iqiyi/bullet/%s/%s/%s_300_%s.z?rn=%s&business=danmu&is_iqiyi=true&is_video_page=true&tvid=%s&albumid=%s&categoryid=%s&qypid=01010021010000000000";

List danmus = new ArrayList();

// 根据电影或电视剧的时长计算出需要多少个批量弹幕请求，爱奇艺平均5分钟请求一次加载弹幕

int page = duration / (60 * 5) + 1;

for (int i = 1; i <= page; i++) {

try {

String t = "0000" + tvId;

int length = t.length();

String first = t.substring(length - 4, length - 2);

String second = t.substring(length - 2);

String rn = "0." + randomNum(16);

String danmuUrl = String.format(IQIYI_GET_DANMU_URL, first, second, tvId, i, rn, tvId, albumId,

channelId);

String res = httpGetRequest(danmuUrl, true);

if (res != null) {

danmus.add(res);

}

} catch (Exception e) {

e.printStackTrace();

}

}

return danmus;

}

// httpClient 请求

private static String httpGetRequest(String url, boolean needUnzip) {

CloseableHttpClient httpClient = HttpClients.custom().build();

HttpGet httpGet = new HttpGet(url);

CloseableHttpResponse response = null;

try {

response = httpClient.execute(httpGet);

HttpEntity entity = response.getEntity();

if (entity != null) {

if (needUnzip) {

return new String(decompress(entity.getContent()));

}

return EntityUtils.toString(entity);

}

} catch (Exception e) {

} finally {

try {

response.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return null;

}

// 解压缩字节流

private static byte[] decompress(InputStream is) {

InflaterInputStream iis = new InflaterInputStream(is);

ByteArrayOutputStream o = new ByteArrayOutputStream(1024);

try {

int i = 1024;

byte[] buf = new byte[i];

while ((i = iis.read(buf, 0, i)) > 0) {

o.write(buf, 0, i);

}

} catch (IOException e) {

e.printStackTrace();

}

return o.toByteArray();

}

// 构造随机参数

private static String randomNum(double n) {

double s = Math.pow(10, n - 1);

double e = Math.pow(10, n) - 1;

double res = Math.random() * (e - s) + s;

NumberFormat nf = NumberFormat.getInstance();

nf.setGroupingUsed(false);

return nf.format(res);

}

}

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