public void download(HttpServletResponse response) throws IOException { String[] filePath = new String[]{"D:\\ykds\\1aa.jpg", "D:\\ykds\\2aa.jpg", "D:\\ykds\\3aa.jpg"}; List<File> fileList = new ArrayList<>(); for (String s : filePath) { File file = new File(s); fileList.add(file); } response.setHeader("content-type", "application/octet-stream"); response.setContentType("application/octet-stream"); response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=download.zip"); ZipUtils.downloadZip(response.getOutputStream(), fileList); }我怎么将String[]中的死值写成我另外一个实体中的值

你可以通过读取实体中的值来替换掉硬编码的文件路径，例如：

public void download(HttpServletResponse response, YourEntity entity) throws IOException {
String[] filePath = new String[]{entity.getPath1(), entity.getPath2(), entity.getPath3()};
List<File> fileList = new ArrayList<>();
for (String s : filePath) {
File file = new File(s);
fileList.add(file);
}
response.setHeader("content-type", "application/octet-stream");
response.setContentType("application/octet-stream");
response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=download.zip");
ZipUtils.downloadZip(response.getOutputStream(), fileList);
}

这样，你就可以调用 download 方法并传入一个实体对象，其中包含需要下载的文件路径。

相关问题

public void download(HttpServletResponse response) throws IOException { String[] filePath = new String[]{"D:\\ykds\\1aa.jpg", "D:\\ykds\\2aa.jpg", "D:\\ykds\\3aa.jpg"}; List<File> fileList = new ArrayList<>(); for (String s : filePath) { File file = new File(s); fileList.add(file); } response.setHeader("content-type", "application/octet-stream"); response.setContentType("application/octet-stream"); response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=download.zip"); ZipUtils.downloadZip(response.getOutputStream(), fileList); }这段代码的作用

这段代码是一个Java后端的文件下载功能实现，主要作用是将指定路径下的多个文件压缩成一个zip包并提供给客户端进行下载。具体实现过程如下：

1. 首先将指定路径下的多个文件路径存入一个字符串数组中。

2. 创建一个File类型的列表，并遍历文件路径数组，将每个文件路径转换为File类型的对象，并添加到列表中。

3. 设置HTTP响应头，包括content-type，content-disposition等信息。content-type设置为application/octet-stream，表示要下载的是二进制流文件，content-disposition设置为attachment，表示附件形式下载。filename则指定了下载后保存的文件名。

4. 调用ZipUtils工具类提供的downloadZip方法将文件列表压缩成一个zip包，并将压缩后的数据通过response的输出流写入到客户端进行下载。

注意：这段代码需要依赖ZipUtils工具类，而ZipUtils工具类的实现可以参考其他开源的zip工具类库。

public class DownloadServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String local = "/home/hadoop/Downloads"; String filePath = new String(request.getParameter("filePath").getBytes("ISO-8859-1"),"GB2312"); System.out.println(filePath); JobConf conf = HDFSDao.getConfig(); HDFSDao hdfs = new HDFSDao(conf); hdfs.download(filePath, local); FileStatus[] list = hdfs.ls("hdfs://master:9000/user/hadoop"); request.setAttribute("list", list); request.getRequestDispatcher("index.jsp").forward(request, response); } } System.out.println( "Download Successfully!" ); }

这是一个名为 DownloadServlet 的公共类，继承了 HttpServlet 类。它有一个 serialVersionUID 属性，并设置为 1L。该类实现了 HttpServlet 类的方法。