超简单的抖音去水印原理教程
一、前言
抖音去水印方法很简单,以前一直没有去研究,以为搞个去水印还要用到算法去除,直到动手的时候才发现这么简单,不用编程基础都能做。
二、原理与步骤
其实抖音它是有一个隐藏无水印地址的,只要我们找到那个地址就可以了1、我们在抖音找一个想要去水印的视频链接
9.23 mQK:/ 这辈子总要和你最爱的人来看一次洱海吧%洱海 %治愈系风景 https://v.douyin.com/NAmJfAJ/ 复制此链接,打开Dou音搜索,直接观看视频!
注意:这里一定要是https开头的,不是口令
打开浏览器访问:
https://v.douyin.com/NAmJfAJ/ 
访问之后会重定向到这个地址,后面有一串数字,这个就是视频的id,他是根据这个唯一id来找到视频播放的

按F12查看网络请求,找到刚刚复制的那个请求地址,在响应头里有一个location链接,访问location的链接
https://www.iesdouyin.com/share/video/7064781119429807363/ 在F12中有许多请求,查看众多的请求里有一个请求是:请求太多没找到可以直接跳过,直接看:https://aweme.snssdk.com 这个就行了,把id替换一下
https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids=7064781119429807363 把这个请求再次用浏览器访问,然后返回了一大串json数据,一直放下翻可以找到这个链接
https://aweme.snssdk.com/aweme/v1/playwm/?video_id=v0200fg10000c85i9ejc77ue0kb2vo80&ratio=720p&line=0 
直接用那个链接访问,他其实是一个有水印的链接,仔细观察发现最后那里有一段/playwm,有两个字母wm其实就是watermark英语单词的缩写,去掉wm后就能得到一个无水印链接了
https://aweme.snssdk.com/aweme/v1/play/?video_id=v0200fg10000c85i9ejc77ue0kb2vo80&ratio=720p&line=0 
到这里无水印已经完成了
三、代码实现
这里我用的是Java去实现,这个跟语言无关,只要能发请求就行
/*** 下载抖音无水印视频** @throws IOException*/
@GetMapping(value = "/downloadDy")
public void downloadDy(String dyUrl, HttpServletResponse response) throws IOException {ResultDto resultDto = new ResultDto();try {dyUrl = URLDecoder.decode(dyUrl).replace("dyUrl=", "");resultDto = dyParseUrl(dyUrl);} catch (Exception e) {e.printStackTrace();}if (resultDto.getVideoUrl().contains("http://")) {resultDto.setVideoUrl(resultDto.getVideoUrl().replace("http://", "https://"));}String videoUrl = resultDto.getVideoUrl();response.sendRedirect(videoUrl);
} public ResultDto dyParseUrl(String redirectUrl) throws Exception {redirectUrl = CommonUtils.getLocation(redirectUrl);ResultDto dyDto = new ResultDto();if (!StringUtils.isEmpty(redirectUrl)) {/*** 1、用 ItemId 拿视频的详细信息,包括无水印视频url*/String itemId = CommonUtils.matchNo(redirectUrl);StringBuilder sb = new StringBuilder();sb.append(CommonUtils.DOU_YIN_BASE_URL).append(itemId);String videoResult = CommonUtils.httpGet(sb.toString());DYResult dyResult = JSON.parseObject(videoResult, DYResult.class);/*** 2、无水印视频 url*/String videoUrl = dyResult.getItem_list().get(0).getVideo().getPlay_addr().getUrl_list().get(0).replace("playwm", "play");String videoRedirectUrl = CommonUtils.getLocation(videoUrl);dyDto.setVideoUrl(videoRedirectUrl);/*** 3、音频 url*/String musicUrl = dyResult.getItem_list().get(0).getMusic().getPlay_url().getUri();dyDto.setMusicUrl(musicUrl);/*** 4、封面*/String videoPic = dyResult.getItem_list().get(0).getVideo().getDynamic_cover().getUrl_list().get(0);dyDto.setVideoPic(videoPic);/*** 5、视频文案*/String desc = dyResult.getItem_list().get(0).getDesc();dyDto.setDesc(desc);}return dyDto;} ResultDto.java
public class ResultDto {private String videoUrl; //视频private String musicUrl; //背景音乐private String videoPic; //无声视频private String desc;public String getDesc() {return desc;}public void setDesc(String desc) {this.desc = desc;}public String getVideoUrl() {return videoUrl;}public void setVideoUrl(String videoUrl) {this.videoUrl = videoUrl;}public String getMusicUrl() {return musicUrl;}public void setMusicUrl(String musicUrl) {this.musicUrl = musicUrl;}public String getVideoPic() {return videoPic;}public void setVideoPic(String videoPic) {this.videoPic = videoPic;}
} CommonUtils .java
public class CommonUtils {public static String DOU_YIN_BASE_URL = "https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids=";public static String HUO_SHAN_BASE_URL = " https://share.huoshan.com/api/item/info?item_id=";public static String DOU_YIN_DOMAIN = "douyin";public static String HUO_SHAN_DOMAIN = "huoshan";public static String getLocation(String url) {try {URL serverUrl = new URL(url);HttpURLConnection conn = (HttpURLConnection) serverUrl.openConnection();conn.setRequestMethod("GET");conn.setInstanceFollowRedirects(false);conn.setRequestProperty("User-agent", "ua");//模拟手机连接conn.connect();String location = conn.getHeaderField("Location");return location;} catch (Exception e) {e.printStackTrace();}return "";}public static String matchNo(String redirectUrl) {List results = new ArrayList<>();Pattern p = Pattern.compile("video/([\\w/\\.]*)/");Matcher m = p.matcher(redirectUrl);while (!m.hitEnd() && m.find()) {results.add(m.group(1));}return results.get(0);}public static String hSMatchNo(String redirectUrl) {List results = new ArrayList<>();Pattern p = Pattern.compile("item_id=([\\w/\\.]*)&");Matcher m = p.matcher(redirectUrl);while (!m.hitEnd() && m.find()) {results.add(m.group(1));}return results.get(0);}public static String httpGet2(String urlStr) throws Exception {URL url = new URL(urlStr);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setRequestProperty("Content-Type", "text/json;charset=utf-8");BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));StringBuffer buf = new StringBuffer();String inputLine = in.readLine();while (inputLine != null) {buf.append(inputLine).append("\r\n");inputLine = in.readLine();}in.close();return buf.toString();}/*** 使用Get方式获取数据** @param url URL包括参数,http://HOST/XX?XX=XX&XXX=XXX* @return*/public static String httpGet(String url) {String result = "";BufferedReader in = null;try {URL realUrl = new URL(url);// 打开和URL之间的连接URLConnection connection = realUrl.openConnection();// 设置通用的请求属性connection.setRequestProperty("accept", "*/*");connection.setRequestProperty("connection", "Keep-Alive");connection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");// 建立实际的连接connection.connect();// 定义 BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {System.out.println("发送GET请求出现异常!" + e);e.printStackTrace();}// 使用finally块来关闭输入流finally {try {if (in != null) {in.close();}} catch (Exception e2) {e2.printStackTrace();}}return result;}public static String parseUrl(String url) {String host = "";Pattern p = Pattern.compile("http[:|/|\\w|\\.]+");Matcher matcher = p.matcher(url);if (matcher.find()) {host = matcher.group();}return host.trim();}/*** 查找域名(以 https开头 com结尾)** @param url* @return*/public static String getDomainName(String url) {String host = "";Pattern p = Pattern.compile("https://.*\\.com");Matcher matcher = p.matcher(url);if (matcher.find()) {host = matcher.group();}return host.trim();}
} 四、总结
其实看那个第二部分原理就行了是不是很简单?
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