java 批量下载doc\excle\pdf

指定图片集合

下载到指定文件夹

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Arrays;
import java.util.List;public class OfficeFileDownloader {/*** 需要下载的Office文档URL列表*/private static final List<String> URL_LIST = Arrays.asList("https://test.oss-cn-zhangjiakou.aliyuncs.com/template/20250113/1877528575184224257_2.pdf","https://test.oss-cn-zhangjiakou.aliyuncs.com/template/20250316/1901150106568462338_2.pdf");public static void main(String[] args) {// 文件保存目录String saveDir = "E:\\downloads/";// 创建保存目录File dir = new File(saveDir);if (!dir.exists() && !dir.mkdirs()) {System.err.println("目录创建失败: " + saveDir);return;}// 批量下载文件URL_LIST.forEach(url -> {try {String fileName = extractFileName(url);if (isValidFileType(fileName)) {String savePath = saveDir + fileName;downloadFile(url, savePath);System.out.println("√ 下载成功: " + fileName);} else {System.err.println("× 不支持的文件类型: " + fileName);}} catch (Exception e) {System.err.println("× 下载失败 [" + url + "]: " + e.getMessage());}});}/*** 文件下载核心方法** @param fileUrl* @param savePath* @throws IOException*/private static void downloadFile(String fileUrl, String savePath) throws IOException {URL url = new URL(fileUrl);HttpURLConnection connection = (HttpURLConnection) url.openConnection();try {// 配置网络参数connection.setRequestMethod("GET");connection.setRequestProperty("User-Agent", "Mozilla/5.0");connection.setConnectTimeout(10000); // 10秒连接超时connection.setReadTimeout(30000);   // 30秒读取超时// 验证HTTP响应int statusCode = connection.getResponseCode();if (statusCode != HttpURLConnection.HTTP_OK) {throw new IOException("HTTP " + statusCode + " - " + connection.getResponseMessage());}// 类型校验（仅记录警告）String contentType = connection.getContentType();validateContentType(contentType, savePath);// 流式下载文件try (InputStream in = connection.getInputStream();FileOutputStream out = new FileOutputStream(savePath)) {byte[] buffer = new byte[8192];int bytesRead;while ((bytesRead = in.read(buffer)) != -1) {out.write(buffer, 0, bytesRead);}}} finally {connection.disconnect();}}/*** 内容类型校验方法** @param contentType* @param savePath*/private static void validateContentType(String contentType, String savePath) {if (contentType == null) return;String ext = getFileExtension(savePath).toLowerCase();String mimeType = contentType.split(";")[0].trim().toLowerCase();boolean isValid = switch (ext) {case "doc" -> mimeType.equals("application/msword");case "docx" -> mimeType.equals("application/vnd.openxmlformats-officedocument.wordprocessingml.document");case "xls" -> mimeType.equals("application/vnd.ms-excel");case "xlsx" -> mimeType.equals("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");case "pdf" -> mimeType.equals("application/pdf");default -> true;};if (!isValid) {System.out.println("⚠ 类型警告: " + savePath +"\n   预期类型: " + getExpectedMimeType(ext) +"\n   实际类型: " + contentType);}}/*** 获取预期MIME类型** @param ext* @return*/private static String getExpectedMimeType(String ext) {return switch (ext.toLowerCase()) {case "doc" -> "application/msword";case "docx" -> "application/vnd.openxmlformats-officedocument.wordprocessingml.document";case "xls" -> "application/vnd.ms-excel";case "xlsx" -> "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";case "pdf" -> "application/pdf";default -> "unknown";};}/*** 校验文件扩展名*/private static boolean isValidFileType(String fileName) {String ext = getFileExtension(fileName).toLowerCase();return ext.matches("docx?|xlsx?|pdf");}/*** 从URL提取文件名*/private static String extractFileName(String fileUrl) {// 清理URL参数和锚点String cleanUrl = fileUrl.split("[?#]")[0];// 获取文件名部分int lastSlash = cleanUrl.lastIndexOf('/');if (lastSlash == -1 || lastSlash == cleanUrl.length() - 1) {throw new IllegalArgumentException("无效的URL格式: " + fileUrl);}return cleanUrl.substring(lastSlash + 1);}/*** 获取文件扩展名*/private static String getFileExtension(String fileName) {int dotIndex = fileName.lastIndexOf('.');return (dotIndex == -1 || dotIndex == fileName.length() - 1) ?"" : fileName.substring(dotIndex + 1);}
}

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