Servlet下载文件

package com.hk.servlet;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownloadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //读资源，获取资源在服务器的绝对地址
        //资源所在位置/download/校花.jpg
        String path = this.getServletContext().getRealPath("/download/校花.jpg");
        System.out.println(path);
        //截取文件名d
        String filename = path.substring(path.lastIndexOf("\\")+1);
        filename = URLEncoder.encode(filename,"UTF-8");//中文文件名乱码

        //通知浏览器以下载的方式打开
        response.setHeader("Content-Disposition", "attachment;filename"+filename);
        InputStream in = null;
        OutputStream out = null;
        try{
            in = new FileInputStream(path);
            int len = 0;
            byte buffer[] = new byte[1024];

            out = response.getOutputStream();
            while((len = in.read(buffer))>0){
                out.write(buffer, 0, len);
            }
        }finally{
            if(in!=null){
                in.close();
            }
            if(out!=null){
                out.close();
            }
        }
    }

}