Servlet下载文件

系统管理员 2022-06-13 00:27 211阅读 0赞

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();
                }
            }
        }
    
    }

![这里写图片描述][SouthEast]

[SouthEast]: /images/20220613/79257a7cfc3241828853668d98f1d282.png