文件下载—SSM框架文件下载

1、准备上传下载的api组件

<dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.4</version>
</dependency> 
<dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>
 
2、编写前台上传表单
<body>
请点击下载：<a href="user/download?filename=moni.jpg">moni.jpg</a>
</body>
 
3、编写controller层（在conreoller层拼接附件名字和所在文件夹位置（path）,创建输出流直接写入response中）
  /**
         * 文件下载
         * @throws IOException 
         */
        @RequestMapping(value="/download",method=RequestMethod.GET)
        public void download(@RequestParam(value="filename")String filename,
                HttpServletRequest request,
                HttpServletResponse response) throws IOException {
            //模拟文件，myfile.txt为需要下载的文件  
            String path = request.getSession().getServletContext().getRealPath("statics\\upload")+"\\"+filename;  
            //获取输入流  
            InputStream bis = new BufferedInputStream(new FileInputStream(new File(path)));
            //转码，免得文件名中文乱码  
            filename = URLEncoder.encode(filename,"UTF-8");  
            //设置文件下载头  
            response.addHeader("Content-Disposition", "attachment;filename=" + filename);    
            //1.设置文件ContentType类型，这样设置，会自动判断下载文件类型    
            response.setContentType("multipart/form-data");   
            BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());  
            int len = 0;  
            while((len = bis.read()) != -1){  
                out.write(len);  
                out.flush();  
            }  
            out.close();  
        }

 

posted @ 2017-12-18 21:38  老人与JAVA  阅读(9126)  评论(0)  编辑  收藏  举报