需求: 網絡多文件下載并壓縮，然后對壓縮文件進行加密操作。

一、基本思路:

1. 循環URL list通過RUI獲取文件流生成本地文件，add進文件集合

2. zip文件 add普通文件集合,生成壓縮文件

3. response 下載。通過壓縮文件路徑獲取文件流,寫入outputstream

二、代碼實現

maven依賴

<dependency><groupId>net.lingala.zip4j</groupId><artifactId>zip4j</artifactId><version>1.3.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.6</version></dependency>

下載文件代碼如下:

import cn.hutool.core.date.DateUtil; import net.lingala.zip4j.core.ZipFile; import net.lingala.zip4j.exception.ZipException; import net.lingala.zip4j.model.ZipParameters; import net.lingala.zip4j.util.Zip4jConstants; import org.apache.commons.io.FileUtils; import org.apache.commons.io.FilenameUtils; import org.springframework.util.ResourceUtils;import javax.servlet.http.HttpServletResponse; import java.io.*; import java.net.URI; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.List;/*** * @param response* @param urls 文件url* @param zipName 壓縮文件名稱*/public static void downloadZip(HttpServletResponse response, List<String> urls, String zipName) {try {String filePath = "~/Downloads/";String fileName = zipName + DateUtil.format(new Date(), "yyyyMMddHHmmss") + ".zip";ZipFile zipFile = getZipStream(urls, UserUtil.getUserAccount(), filePath + fileName);InputStream fis = new BufferedInputStream(new FileInputStream(filePath + fileName));response.setCharacterEncoding("UTF-8");response.setHeader("Content-Disposition","attachment; filename=" + new String(fileName.getBytes("ISO8859-1"), "UTF-8"));response.setContentLength((int) zipFile.getFile().length());response.setContentType("application/zip");// 定義輸出類型BufferedInputStream buff = new BufferedInputStream(fis);byte[] b = new byte[1024];// 相當于我們的緩存long k = 0;// 該值用于計算當前實際下載了多少字節OutputStream myout = response.getOutputStream();// 從response對象中得到輸出流,準備下載// 開始循環下載while (k < zipFile.getFile().length()) {int j = buff.read(b, 0, 1024);k += j;myout.write(b, 0, j);}myout.flush();buff.close();zipFile.getFile().delete();} catch (Exception e) {e.printStackTrace();}}/*** * @param fileUrls 文件urls* @param password 壓縮加密字符串* @param zipFileName 壓縮包全路徑(包括路徑和文件名)* @return* @throws IOException* @throws ZipException*/public static ZipFile getZipStream(List<String> fileUrls, String password, String zipFileName) throws IOException, ZipException {if (fileUrls != null && fileUrls.size() > 0) {ArrayList<File> filesToAdd = new ArrayList<>();for (String fileUrl : fileUrls) {URI uri = URI.create(fileUrl);String name = FilenameUtils.getName(uri.getPath());System.out.println(name);File file = new File("~/Downloads/" + name);FileUtils.copyInputStreamToFile(uri.toURL().openStream(), file);filesToAdd.add(file);}ZipParameters parameters = new ZipParameters();parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);//壓縮方式parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);//壓縮級別parameters.setEncryptFiles(true);parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_STANDARD);//加密方式parameters.setPassword(password);ZipFile zipFile = new ZipFile(zipFileName);zipFile.setFileNameCharset("gbk");zipFile.addFiles(filesToAdd, parameters);if (filesToAdd.size() > 0) {for (File file : filesToAdd) {file.delete();}}return zipFile;}return null;}

總結

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