文件下载

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文件下载java
/**     * 文件下载     * @Description:      * @param fileName     * @param request     * @param response     * @return     */    @RequestMapping("/download")    public String downloadFile(@RequestParam("fileName") String fileName,            HttpServletRequest request, HttpServletResponse response) {        if (fileName != null) {            String realPath = request.getServletContext().getRealPath(                    "WEB-INF/File/");            File file = new File(realPath, fileName);            if (file.exists()) {                response.setContentType("application/force-download");// 设置强制下载不打开                response.addHeader("Content-Disposition",                        "attachment;fileName=" + fileName);// 设置文件名                byte[] buffer = new byte[1024];                FileInputStream fis = null;                BufferedInputStream bis = null;                try {                    fis = new FileInputStream(file);                    bis = new BufferedInputStream(fis);                    OutputStream os = response.getOutputStream();                    int i = bis.read(buffer);                    while (i != -1) {                        os.write(buffer, 0, i);                        i = bis.read(buffer);                    }                } catch (Exception e) {                    // TODO: handle exception                    e.printStackTrace();                } finally {                    if (bis != null) {                        try {                            bis.close();                        } catch (IOException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                    }                    if (fis != null) {                        try {                            fis.close();                        } catch (IOException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                    }                }            }        }        return null;    }
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