javaweb文件下载

//jsp

<a href="download?filename=test.jpg">download</a>

//servlet

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

response.addHeader("content-type", "application/octet-stream");

String filename = request.getParameter("filename");

response.addHeader("content-Disposition", "attachment;filename=" + filename);

System.out.println("filename=" + filename);

    InputStream in = getServletContext().getResourceAsStream("download/" + filename);

    ServletOutputStream out = response.getOutputStream();

    byte[] bs = new byte[10];

    int len = -1;

    while((len = in.read(bs)) != -1)

    {

    out.write(bs,0,len);

    }

    out.close();

    in.close();

}

文件名中文乱码解决

URLEncoder.encode(filename, "utf-8")