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public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String fileName = "D:\\test.csv";
FileInputStream fileInputStream = new FileInputStream(fileName);
BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
response.reset();

response.setContentType("text/html;");
response.setHeader("Content-Disposition", "attachment;filename="+fileName);
OutputStream outputStream = response.getOutputStream();
byte[] b = new byte[1024];
int len = 0;
while((len=bufferedInputStream.read(b)) != -1){
outputStream.write(b,0,len);
}
outputStream.close();
bufferedInputStream.close();
fileInputStream.close();
}

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Java code:

<%@ page language="java" pageEncoding="utf-8"%>
<%@ page import="java.io.OutputStream,java.io.File,java.io.File


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