JAVAWEB文件下载

最新推荐文章于 2021-10-10 21:42:22 发布

代戍

最新推荐文章于 2021-10-10 21:42:22 发布

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CC 4.0 BY-SA版权

文章标签： javaweb 文件下载

本文链接：https://blog.youkuaiyun.com/qq_33565984/article/details/78277572

本文介绍了一种在JavaWeb环境中实现文件下载的方法。通过Servlet接收客户端请求，设置响应头为下载模式，并通过输入输出流完成文件传输过程。适用于需要提供文件下载功能的Web应用。

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JAVAWEB 文件下载

<body>
    <!-- <a href="/prictice/domn/hibernate-release-5.0.7.Final.zip">download--ZIP</a>
    <a href="/prictice/domn/love(0).png">download-PNG</a> -->
    <hr/>
    <a href="/prictice/servlet?filename=hibernate-release-5.0.7.Final.zip">download--ZIP</a>
    <a href="/prictice/servlet?filename=love(0).png">download-PNG</a>
</body>
</html>

@WebServlet("/servlet")
public class ServeltDownLoad extends HttpServlet{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String filename=req.getParameter("filename");
        System.out.println(filename);
        //文件类型
        resp.setContentType(getServletContext().getMimeType(filename));
        //设置header
        resp.setHeader("Content-Disposition", "attachment;filename="+filename);
        //获取绝对路径
        String fullfilename = getServletContext().getRealPath("/domn/"+filename);
        //构建输入输出流
        InputStream in = new FileInputStream(fullfilename);
        System.out.println("fullname:"+fullfilename);
        OutputStream out = resp.getOutputStream();
        byte[] str=new byte[2048];
        int len;
        while((len=in.read(str))!=-1){
            out.write(str, 0, len);
        }
        in.close();
        out.close();
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(req, resp);
    }   
}