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  package com.adair.servlet;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

public class FileServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String realPath = “C:\Users\Adair\Desktop\庆林.png”;
String fileName = realPath.substring(realPath.lastIndexOf(“\”) + 1);//得到文件名
System.out.println(“文件的路径”+realPath);
//设置浏览器能够支持我们下载的东西
resp.setHeader(“Content-disposition”,“attachment;filename=”+URLEncoder.encode(fileName,“UTF-8”));
FileInputStream fis = new FileInputStream(realPath);
ServletOutputStream os = resp.getOutputStream();
int len=0;
byte[] buffer = new byte[1024];
while ((len=fis.read(buffer))!=-1){
os.write(buffer,0,len);
}
fis.close();
os.close();

}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    super.doPost(req, resp);
}

}