[英]Zip file created on server and download that zip, using java
我有以下代码从mkyong到本地的zip文件。 但是,我的要求是在服务器上压缩文件并需要下载。 任何人都可以帮忙。
代码写入zipFiles:
public void zipFiles(File contentFile, File navFile)
{
byte[] buffer = new byte[1024];
try{
// i dont have idea on what to give here in fileoutputstream
FileOutputStream fos = new FileOutputStream("C:\\MyFile.zip");
ZipOutputStream zos = new ZipOutputStream(fos);
ZipEntry ze= new ZipEntry(contentFile.toString());
zos.putNextEntry(ze);
FileInputStream in = new FileInputStream(contentFile.toString());
int len;
while ((len = in.read(buffer)) > 0) {
zos.write(buffer, 0, len);
}
in.close();
zos.closeEntry();
//remember close it
zos.close();
System.out.println("Done");
}catch(IOException ex){
ex.printStackTrace();
}
}
我可以在fileoutputstream中提供什么? contentfile和navigationfile是我从代码创建的文件。
如果您的服务器是一个servlet容器,只需编写一个HttpServlet
来进行压缩并为该文件提供服务。
您可以将servlet响应的输出流传ZipOutputStream
的构造函数,zip文件将作为servlet响应发送:
ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
在压缩之前不要忘记设置响应mime类型,例如:
response.setContentType("application/zip");
全貌:
public class DownloadServlet extends HttpServlet {
@Override
public void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException {
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment; filename=data.zip");
// You might also wanna disable caching the response
// here by setting other headers...
try ( ZipOutputStream zos = new ZipOutputStream(response.getOutputStream()) ) {
// Add zip entries you want to include in the zip file
}
}
}
尝试这个:
@RequestMapping(value="download", method=RequestMethod.GET)
public void getDownload(HttpServletResponse response) {
// Get your file stream from wherever.
InputStream myStream = someClass.returnFile();
// Set the content type and attachment header.
response.addHeader("Content-disposition", "attachment;filename=myfilename.txt");
response.setContentType("txt/plain");
// Copy the stream to the response's output stream.
IOUtils.copy(myStream, response.getOutputStream());
response.flushBuffer();
}
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