01 文件下载编码问题

Posted 2020-08-05 meitanzai

    /**
     * 文件下载
     * 
     * @param id
     * @param basePath
     * @param response
     * @throws Exception
     */
    
    @RequestMapping(value = "/file_download", method = { RequestMethod.POST,RequestMethod.GET })
    public void downloadCommon(String id, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        
        //调用ServletOutputStream或者Writer之前有效。
        //当使用的缓存已满时，容器必须立刻刷新把缓存的内容发送到客户端，如果这是第一个被发送到客户端的数据，那么response也会被认为是已提交
        response.reset();
        response.setHeader("Content-Type", "application/force-download");
        
        String encode = request.getParameter("encode");
        if (encode != null && !"".equals(encode)) {
            try {
                request.setCharacterEncoding(ENCODING);
            } catch (UnsupportedEncodingException e) {
                request.setCharacterEncoding(ENCODING);
            }
        } else {
            request.setCharacterEncoding(ENCODING);
        }
        
        String path = null;
        String fileName=null;
        String saveFileName=null;
        
        InputStream input =null;
        OutputStream output = null;
        
        try {
            
            // 构建流
            input = new FileInputStream(path + File.separator + fileName);
            output =response.getOutputStream();      

            if(request.getHeader("user-agent").indexOf("MSIE") != -1 || request.getHeader("user-agent").indexOf("like Gecko")!=-1) {
                saveFileName = java.net.URLEncoder.encode(saveFileName,ENCODING);
            } else {
                saveFileName = new String(saveFileName.getBytes(ENCODING),"iso-8859-1");   
            }
            //在response被提交前,头信息必须被设置，否则无效
            //Content-Disposition 设置文件名，文件名有空格时下载文件名错误的解决办法 \fileName\
            response.setHeader("Content-disposition", "inline;filename=\"" +saveFileName+"\"");
            
           // 输出文件流
            byte[] buffer = new byte[1024];
            int i = 0;
            while ((i = input.read(buffer)) != -1) {
                output.write(buffer, 0, i);
            }
            
        } catch (Exception e) {
            
            //TODO
        } finally {
            try {
                if(null !=output) {
                    output.flush();
                    output.close();
                }
                if(null !=input) {
                    input.close();
                }
            } catch (Exception e) {
            }
        }

    }