Downloading Multiple Files in Java
Posted By : Ashish Sharma | 10-Oct-2013
Suppose that you have string array and want to download each of them in separate file.
String[] str = new String[5]; str[0] = "File1 Data"; str[1] = "File2 Data"; str[2] = "File3 Data"; str[3] = "File4 Data"; str[4] = "File5 Data";
If You want to download multiple number of files, you must add them to a zip file and then download it.
This code will create a zip file.
ByteArrayOutputStream baos = new ByteArrayOutputStream() ZipOutputStream zipFile = new ZipOutputStream(baos)
Now run the loop for the files you want to add in the zip file, in grails you can use code below
for(int i =0;i<5;i++)
{
zipFile.putNextEntry(new ZipEntry("report"+i+".txt"));
zipFile << str[i];
zipFile.closeEntry();
}
in case of java you can use write() of ZipOutputStream
Now close the ZipOutputStream object and prepare the response header
zipFile.finish();
response.setContentType("APPLICATION/DOWNLOAD");
response.setHeader("Content-disposition", "attachment; filename=\"ZippedFile.zip\"")
To send the zip file as response in grails
response.outputStream << baos.toByteArray()
for sending response in java
response.getOutputStream().write(baos.toByteArray());
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About Author
Ashish Sharma
Ashish is a bright Groovy and Grails developer and have worked on development of various SaaS applications using Grails technologies. Ashish likes PC games and works out at Gym in his free time.