[英]Download a zip from a servlet Java
I don't understand why this is so hard and everybody has it's own implementation... 我不明白为什么这么难,每个人都有自己的实施......
So in my server, I generate a .zip
file which I want the user to be able to download upon click. 所以在我的服务器中,我生成一个.zip
文件,我希望用户能够在点击时下载。
So I set up the request, which the server successfully receives and now, i'm struggling with writing the byte array to the output. 所以我设置了服务器成功接收的请求,现在,我正在努力将字节数组写入输出。
Here's my code for the response: 这是我的响应代码:
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("Downloading clusters.zip");
/* Generate the directory on the server, then zip it. */
clustersToFiles();
zipClusters();
/* Now the zip is saved on zipFullPath */
System.out.println("Done generating the .zip");
String parent_dir = System.getProperty("catalina.base");
String filename = "clusters.zip";
String zipFullPath = parent_dir + "/" + filename;
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment;filename=\"" + filename + "\"");
OutputStream out = response.getOutputStream();
FileInputStream fis = new FileInputStream(zipFullPath);
int bytes;
while ((bytes = fis.read()) != -1) {
System.out.println(bytes);
out.write(bytes);
}
fis.close();
response.flushBuffer();
System.out.println(".zip file downloaded at client successfully");
}
The fact that the downloaded file is a ZIP isn't relevant (except for the content type), you just want to download a binary file. 下载的文件是ZIP的事实是不相关的(内容类型除外),您只想下载二进制文件。
PrintWriter
isn't good at that, this writer is used to write text output, and the write(int)
method you are using : PrintWriter
并不擅长这个,这个编写器用于编写文本输出,以及您正在使用的write(int)
方法:
Writes a single character . 写一个字符 。
Just use a low level plain OutputStream
, its write(int)
method : 只需使用低级普通OutputStream
,其write(int)
方法:
Writes the specified byte to this output stream. 将指定的字节写入此输出流。
So just go : 所以,去吧:
OutputStream out = response.getOutputStream();
You may find some more ways of doing it in this question : Implementing a simple file download servlet 您可以在此问题中找到更多方法: 实现简单的文件下载servlet
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