springMVC上传与下载

1.文件上传

(1).在springMVC-config.xml文件配置：

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <property name="defaultEncoding" value="utf-8"></property>   
        <property name="maxUploadSize" value="10485760000"></property>  
        <property name="maxInMemorySize" value="40960"></property>  
   </bean> 

(2).控制器方法：

@RequestMapping(value = "/ok")
    public void user7(HttpServletRequest req, String name,
            @RequestParam(value = "file", required = false) MultipartFile file) {
        String filePath = req.getServletContext().getRealPath("/");
        String contextPath = req.getContextPath();
        String fileName = file.getOriginalFilename();
        File destFile = new File(filePath + File.separator + fileName);
        try {
            file.transferTo(destFile);
        } catch (IllegalStateException | IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

file.jsp:

<form action="${pageContext.request.contextPath }/ok" enctype="multipart/form-data" method="POST">
           <input type="text" name="name" value="12345"><br/>
           <input type="file" name="file" value="上传"><br/>
           <input type="submit" value="提交">
       </form>

 2.多文件上传

(1).在springMVC-config.xml文件配置：

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <property name="defaultEncoding" value="utf-8"></property>   
        <property name="maxUploadSize" value="10485760000"></property>  
        <property name="maxInMemorySize" value="40960"></property>  
   </bean>

(2).

file.jsp:

<form action="${pageContext.request.contextPath }/ok" enctype="multipart/form-data" method="POST">
           <input type="text" name="name" value="12345"><br/>
           <input type="file" name="file" value="上传"><br/>

　　　　<input type="file" name="file" value="上传"><br/>

　　　　<input type="file" name="file" value="上传"><br/>
           <input type="submit" value="提交">
       </form>

(3).控制器

@RequestMapping(value = "/ok")
    public void user7(MultipartHttpServletRequest req, String name,
            @RequestParam(value = "file", required = false) MultipartFile[] file,
            Model model) {
        String method = req.getMethod();
        List<MultipartFile> files = req.getFiles("file");
        for (int i = 0; i < files.size(); i++) {
            model.addAttribute("file"+i, files.get(i).getOriginalFilename());
        }
    }

注意：MultipartFile[] 方式试过，只能接收一个，不知道是不是版本问题。

2.文件下载：

@RequestMapping(value = "/down1")
    public void user0(HttpServletRequest request, HttpServletResponse response,
            Map map) {
        try {
            File file = new File("D:/你好.txt");
            request.setCharacterEncoding("UTF-8");
            if(!file.exists()){
                response.getWriter().write(new String(file.getName().getBytes("utf-8"),"ISO8859-1"));
                return;
            }
            InputStream in = new FileInputStream(file);
            String name = file.getName();
//            response.setContentType("text/plain");
            
            response.setContentType("application/x-msdownload;");
            response.setHeader("Content-disposition", "attachment; filename="
                    + new String(name.getBytes("utf-8"), "ISO8859-1"));
            response.setHeader("Content-Length", String.valueOf(file.length()));
            
            ServletOutputStream out = response.getOutputStream();
            byte[] b = new byte[1024];
            int len;
            while ((len = (in.read(b))) != -1) {
                out.write(b, 0, b.length);
            }
            in.close();
            out.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }