链接：我的讲解视频https://www.bilibili.com/video/BV14e411Q7oG/
本文仅供学术用途

先上图

代码

爬虫核心

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import com.gargoylesoftware.htmlunit.*;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.Executor;
import org.apache.commons.exec.PumpStreamHandler;
import org.apache.commons.io.IOUtils;import java.io.*;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;class Spider {public void catchvideo(String url,String addr) throws IOException {//TODO 建立无头浏览器WebClient webClient = new WebClient();webClient.getOptions().setJavaScriptEnabled(false);webClient.getOptions().setCssEnabled(false);webClient.getOptions().setThrowExceptionOnFailingStatusCode(true);webClient.getOptions().setThrowExceptionOnScriptError(true);webClient.addRequestHeader("Referer", "https://www.bilibili.com/index.html");webClient.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36 Edg/117.0.2045.40");//TODO 设置请求参数，建立请求WebRequest webRequest = new WebRequest(new URL(url), HttpMethod.GET);//TODO 获取响应体Page page = webClient.getPage(webRequest);WebResponse webResponse = page.getWebResponse();String contentAsString = webResponse.getContentAsString();
//        System.out.println(contentAsString);//TODO 模式匹配找视频总数Pattern pattern = Pattern.compile("<script>window.__INITIAL_STATE__=(.*?);\\(function\\(\\)");Matcher matcher = pattern.matcher(contentAsString);String s = null;if (matcher.find())s = matcher.group(1);JSONObject jsonObject = JSON.parseObject(s);int videonum = jsonObject.getJSONObject("videoData").getIntValue("videos");
//        System.out.println("视频总数" + videonum);//TODO 获取目录名pattern = Pattern.compile("<meta data-vue-meta=\"true\" property=\"og:title\" content=\"(.*?)_哔哩哔哩_bilibili\">");matcher = pattern.matcher(contentAsString);String s1 = null;if (matcher.find())s1 = matcher.group(1);elseSystem.out.println("没有找到");//目录名去除./&*这些字符String content = s1.replaceAll("[/&*_，《》\\s+]", "");
//        System.out.println("目录名" + content);//TODO 建立目录String dir = addr+"\\" + content + "\\";File directory = new File(dir);if (!directory.exists())directory.mkdirs();for (int i = 1; i <= videonum; i++) {//TODO 设置请求参数，建立请求webRequest = new WebRequest(new URL(url + "?p=" + i), HttpMethod.GET);
//            System.out.println(webRequest);//TODO 获取响应体page = webClient.getPage(webRequest);webResponse = page.getWebResponse();contentAsString = webResponse.getContentAsString();//TODO 获取视频链接pattern = Pattern.compile("<script>window.__playinfo__=(.*?)</script>");matcher = pattern.matcher(contentAsString);String s2 = null;if (matcher.find())s2 = matcher.group(1);elseSystem.out.println("没有找到");String videolink = JSON.parseObject(s2).getJSONObject("data").getJSONObject("dash").getJSONArray("video").getJSONObject(0).getString("baseUrl");String audiolink = JSON.parseObject(s2).getJSONObject("data").getJSONObject("dash").getJSONArray("audio").getJSONObject(0).getString("baseUrl");
//            System.out.println("视频下载链接\n" + videolink);
//            System.out.println("音频下载链接\n" + audiolink);//TODO 获取视频名称pattern = Pattern.compile("<title data-vue-meta=\"true\">(.*?)_哔哩哔哩_bilibili</title>");matcher = pattern.matcher(contentAsString);String s3 = null;if (matcher.find())s3 = matcher.group(1);elseSystem.out.println("没有找到");//目录名去除./&*这些字符String videoname = s3.replaceAll("[/&*_，《》\\s+]", "");System.out.println(i + "_________________________" + videoname);String videofile = dir + "tmp_" + videoname + ".mp4";String audiofile = dir + "tmp_" + videoname + ".mp3";//TODO 下载视频webRequest = new WebRequest(new URL(videolink), HttpMethod.GET);page = webClient.getPage(webRequest);webResponse = page.getWebResponse();InputStream inputStream = webResponse.getContentAsStream();OutputStream outputStream = new FileOutputStream(videofile);IOUtils.copy(inputStream, outputStream);inputStream.close();outputStream.close();//TODO 下载音频webRequest = new WebRequest(new URL(audiolink), HttpMethod.GET);page = webClient.getPage(webRequest);webResponse = page.getWebResponse();inputStream = webResponse.getContentAsStream();outputStream = new FileOutputStream(audiofile);IOUtils.copy(inputStream, outputStream);inputStream.close();outputStream.close();//TODO 执行合并命令// 创建命令行CommandLine commandLine = CommandLine.parse("ffmpeg -i " + videofile + " -i " + audiofile + " -c:v copy -c:a aac -strict experimental " + dir + i + "_" + videoname + ".mp4"); // 使用 Windows cmd 命令作为示例// 创建执行器Executor executor = new DefaultExecutor();// 设置输出流处理器（可选）PumpStreamHandler streamHandler = new PumpStreamHandler(System.out, System.err); // 将标准输出和错误输出重定向到控制台executor.setStreamHandler(streamHandler);// 执行命令
//            System.out.println(commandLine);executor.execute(commandLine);
//            int exitValue = executor.execute(commandLine); // 执行命令并获取退出值
//            System.out.println("Exit value: " + exitValue); // 打印退出值（通常为0表示成功）File file = new File(audiofile);file.delete();file = new File(videofile);file.delete();}}
}

可视化代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;public class SwingDemo {public static void main(String[] args) {JFrame jFrame = new JFrame("Swing frame");//设置关闭退出程序jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel panel = new JPanel();jFrame.setContentPane(panel);jFrame.setLocationRelativeTo(null);panel.setLayout(new FlowLayout());JLabel jLabel = new JLabel("下载地址");JTextField jTextField = new JTextField(20);jTextField.setToolTipText("下载地址");JButton download = new JButton("下载");panel.add(jLabel);panel.add(jTextField);panel.add(download);JLabel jLabel1 = new JLabel("文件保存位置");JTextField jTextField1 = new JTextField(20);jTextField1.setText("D:\\videos\\");jTextField1.setToolTipText("文件保存位置");JButton fileaddr = new JButton("选择文件夹");panel.add(jLabel1);panel.add(jTextField1);panel.add(fileaddr);fileaddr.addActionListener(e -> {JFileChooser fileChooser = new JFileChooser();fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);int returnValue = fileChooser.showOpenDialog(null);if (returnValue == JFileChooser.APPROVE_OPTION) {File selectedFile = fileChooser.getSelectedFile();jTextField1.setText(selectedFile.getAbsolutePath());}});download.addActionListener(e -> {String url = jTextField.getText()+"/";String fileAddr = jTextField1.getText();System.out.println(url);System.out.println(fileAddr);try {Spider spider = new Spider();spider.catchvideo(url,fileAddr);} catch (IOException ioException) {ioException.printStackTrace();}});//自适应jFrame.pack();jFrame.setVisible(true);}
}