下载各类文件写法

下载文件写法：

protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {

        String fileId=req.getParameter("fileId");
        req.setCharacterEncoding("UTF-8");
        resp.setCharacterEncoding("UTF-8");

        if(StringUtils.isNotEmpty(fileId)){
            FileAttach fileAttach=fileAttachService.get(new Long(fileId));
            String ext=fileAttach.getExt();

            if(ext.toLowerCase().endsWith("zip")){
                resp.setContentType("application/x-zip-compressed");
            }else if(ext.toLowerCase().endsWith("rar")){
                resp.setContentType("application/octet-stream");
            }else if(ext.toLowerCase().endsWith("doc")){
                resp.setContentType("application/msword");
            }else if(ext.toLowerCase().endsWith("xls") || ext.toLowerCase().endsWith("csv")){
                resp.setContentType("application/ms-excel ");

            }else if (ext.toLowerCase().endsWith("pdf")){
                resp.setContentType("application/pdf");
            }else{
                resp.setContentType("application/x-msdownload");
            }

            ServletOutputStream out = null;
            try{

                java.io.FileInputStream fileIn =new java.io.FileInputStream(getServletContext().getRealPath("/")+"/attachFiles/"+fileAttach.getFilePath());

                resp.setHeader("Content-Disposition", "attachment;filename=" +URLEncoder.encode(fileAttach.getFileName(),"UTF-8"));

                out = resp.getOutputStream();

                byte[] buff = new byte[1024];
                int leng = fileIn.read(buff);
                while(leng>0){
                    out.write(buff,0,leng);
                    leng = fileIn.read(buff);
                }
            }catch(Exception ex){
                ex.printStackTrace();
            }finally{
                if(out!=null){
                    try {
                        out.flush();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

            }


        }

    }

 

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