08、文件下载

 

package com.ivan.web;

import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/FileDownloadDemo")
public class FileDownloadDemo extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //解决乱码问题
        String filename = "lol游戏.txt";
        String path = "D:/" + filename;
        filename = URLEncoder.encode(filename,"utf-8");
        
        //响应头设置
        resp.setHeader("Content-disposition", "attachment;filename=" + filename );
        
        //获取文件输入流
        FileInputStream fis = new FileInputStream(path);
        
        //响应信息设置
        ServletOutputStream sos = resp.getOutputStream();
        
        byte[] buf = new byte[1024];
        int len = 0;
        while((len = fis.read(buf)) != -1){
            sos.write(buf, 0, len);
        }
        
        //关闭流资源
        fis.close();
        
    }
}