java批量下载文件打包

你可以使用Java的URL和IO类来实现批量下载文件，并使用Java的压缩库将下载的文件打包。下面是一个简单的示例代码：

import java.io.*;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class FileDownloader {
    public static void main(String[] args) throws IOException {
        List<String> fileUrls = new ArrayList<>();
        fileUrls.add("http://example.com/file1.txt");
        fileUrls.add("http://example.com/file2.txt");
        fileUrls.add("http://example.com/file3.txt");

        String outputDirectory = "downloaded_files";
        String zipFileName = "downloaded_files.zip";

        // 创建输出目录
        File directory = new File(outputDirectory);
        if (!directory.exists()) {
            directory.mkdir();
        }

        // 下载文件到指定目录
        for (String url : fileUrls) {
            downloadFile(url, outputDirectory);
        }

        // 打包下载的文件
        zipFiles(outputDirectory, zipFileName);
    }

    private static void downloadFile(String fileUrl, String outputDirectory) throws IOException {
        URL url = new URL(fileUrl);
        String fileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);

        try (InputStream in = url.openStream();
             FileOutputStream out = new FileOutputStream(outputDirectory + "/" + fileName)) {

            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
            }
        }
    }

    private static void zipFiles(String directory, String zipFileName) throws IOException {
        File dir = new File(directory);
        List<String> fileList = new ArrayList<>();
        populateFilesList(dir, fileList, dir.getAbsolutePath());

        try (FileOutputStream fos = new FileOutputStream(zipFileName);
             ZipOutputStream zos = new ZipOutputStream(fos)) {

            for (String filePath : fileList) {
                ZipEntry zipEntry = new ZipEntry(filePath.substring(directory.length() + 1));
                zos.putNextEntry(zipEntry);

                try (FileInputStream fis = new FileInputStream(filePath)) {
                    byte[] buffer = new byte[1024];
                    int bytesRead;
                    while ((bytesRead = fis.read(buffer)) != -1) {
                        zos.write(buffer, 0, bytesRead);
                    }
                }
            }
        }
    }

    private static void populateFilesList(File dir, List<String> fileList, String basePath) {
        File[] files = dir.listFiles();
        for (File file : files) {
            if (file.isFile()) {
                fileList.add(file.getAbsolutePath());
            } else if (file.isDirectory()) {
                populateFilesList(file, fileList, basePath);
            }
        }
    }
}

在示例代码中，你需要将`fileUrls`列表中的URL替换为你要下载的文件的URL。然后，指定输出目录和打包后的文件名。运行代码后，它将下载文件到指定目录，并将这些文件打包为一个ZIP文件。