文件下载

//下载
$('#dasyszTable').on('click', '.download', function (e) {
    
    var nRow = $(this).parents('tr')[0];
    var aData = dasyszTable.fnGetData(nRow);
    //插入日志
    handleInsertRecord("进入法律、法规制度列表--附件下载");
    
    var myform = $("<form></form>");
    myform.attr('method','post');
    myform.attr('action',BASEPATH + "flfgsysz/downloadFile");
    
    var file1 = $(this).find("a").eq(0).context.innerHTML;
    var fileName = $("<input type='hidden' name='fileName' />");
    fileName.attr('value',file1+","+aData.disc+","+aData.num);
    
    myform.append(fileName);
    myform.appendTo('body').submit();
});

@ResponseBody
@RequestMapping(value = "/downloadFile", method = RequestMethod.POST)
public void downloadFile(HttpServletRequest request, HttpServletResponse response) throws Exception {
    
    String fileName = request.getParameter("fileName");
    String[] split = fileName.split(",");
    String filePath = AddressUtil.getUpload_address() + split[1] + "\\" + split[2] + "_" + split[0];
    // 读到流中
    InputStream inStream = new FileInputStream(filePath);// 文件的存放路径
    // 设置输出的格式
    response.reset();
    response.setContentType("bin");
    response.setContentType("application/octet-stream; charset=utf-8");
    
    fileName = URLEncoder.encode(split[0], "UTF-8");
    if (fileName.length() > 150) {  
        String guessCharset = "gb2312"; /*根据request的locale 得出可能的编码，中文操作系统通常是gb2312*/  
        fileName = new String(fileName.getBytes(guessCharset), "ISO8859-1");   
    }  
    response.setHeader("Content-Disposition", "attachment; filename=" + fileName);  
    
    // 循环取出流中的数据
    byte[] b = new byte[100];
    int len;
    try {
        while ((len = inStream.read(b)) > 0)
            response.getOutputStream().write(b, 0, len);
        inStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

原文地址：https://www.cnblogs.com/sunBinary/p/11806147.html