spring 上传 下載文件

<!-- 上传文件 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 1GB -->
       <property name="maxUploadSize" value="1073741824" />
       <property name="defaultEncoding" value="utf-8"/>
    </bean>

 <form method="post" accept-charset="UTF-8"  th:action="${#httpServletRequest.contextPath+‘/upload‘}" id="multipartform" enctype="multipart/form-data"  class="form-search" role="form">
                        <input type="file" name="file" size="5" id="file" /><button type="submit" id="multipart" class="btn">上传</button>
                        </form>

 1     @RequestMapping(value = "/upload",method= RequestMethod.POST)
 2     @ResponseBody
 3     public String upload(HttpServletRequest request,HttpServletResponse response,@RequestParam("file") MultipartFile file) {
 4         if (file.isEmpty()) {
 5             return ResponseJSON.instance().setStatus(false).addAlertMessage("请选择导入文件！").toJSON();
 6         }
 7         String filename = file.getOriginalFilename();
 8         int index = filename.indexOf(".");
 9         String file_suffix = filename.substring(index, filename.length());
10         if (!file_suffix.equals(".txt")) {
11             return ResponseJSON.instance().setStatus(false).addAlertMessage("请选择txt格式文件！").toJSON();
12         }
13         try {
14             BufferedReader reader = null;
15             String usernameString = null;
16             InputStreamReader isr = null;
17             int line = 1;
18             try {
19                 isr = new InputStreamReader(file.getInputStream(), "utf-8");// 考虑到编码格式
20                 reader = new BufferedReader(isr);
21                 while ((usernameString = reader.readLine()) != null) {
22                     system.out.println(usernameString);
23                     line++;
24                 }
25                 
26             } catch (FileNotFoundException e) {
27                 // TODO Auto-generated catch block
28                 logger.error("读取文件失败！", e);
29             } catch (IOException e) {
30                 // TODO Auto-generated catch block
31                 logger.error("读取文件失败！", e);
32             } finally {
33                     reader.close();
34                     isr.close();
35                     in.close();
36             }
37         } catch (IOException e) {
38             // TODO Auto-generated catch block
39             logger.error("上传文件失败", e);
40             return ResponseJSON.instance().setStatus(false).addAlertMessage("上传文件失败").toJSON();
41         }
42         return ResponseJSON.instance().setStatus(true).toJSON();
43     }
44 
45     /**
46      * 写成txt文件格式
47      * 
48      * @param path
49      * @throws IOException
50      */
51     @RequestMapping(value = "/load")
52     public void writeTxt(HttpServletRequest request, HttpServletResponse response) throws IOException {
53         response.setContentType("text/plain");
54         response.setCharacterEncoding("UTF-8");
55         response.setHeader("Content-disposition", "attachment;filename=result.txt");
56         String name_ip = "这是一个txt文件";
57         OutputStream ops = null;
58         try {
59             ops = response.getOutputStream();
60             ops.write(name_ip.getBytes());
61 
62         } catch (IOException e) {
63             // TODO Auto-generated catch block
64             logger.error("写结果文件异常：", e);
65         } finally {
66             ops.close();
67         }
68 
69     }