Servlet处理文件下载11

来源：互联网发布：it企业招人难编辑：程序博客网时间：2024/06/04 20:09

文件下载的实现步骤
将content-type设置为文件的内容类型，即设置MIME类型
添加一个Content-Disposition的响应首部字段，赋值为attachment；filename=filename
如果文件名带有中文，需要进行编码
使用输出流对文件进行输出

package com.ls.javaees1;import java.io.File;import java.io.FileInputStream;import java.io.IOException;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("/download")public class Servlet2 extends HttpServlet {    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setHeader("content-type", "application/ocelet-stream");        response.addHeader("Content-Disposition", "attachment;filename=示例.rar");        ServletOutputStream os=response.getOutputStream();        FileInputStream is=new FileInputStream(new File("c://demo.rar"));        byte[] data=new byte[2048];        int len=0;        while((len=is.read(data, 0, data.length))!=-1){            os.write(data, 0, len);        }        os.close();        is.close();    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doGet(request, response);    }}

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