spring MVC 文件上传简单示例
spring MVC 文件上传简单示例
这里使用的是form 表单上传，所以需要设置form的enctype=”multipart/form-data”。
uplaodFile.jsp
1 <form id="questionForm" action="<%=request.getContextPath()%>/insertAnswerInfo.action"method="post" enctype="multipart/form-data" > 2 <textarea id="hqcontent" name="answerContent"></textarea> 3 <input type="file" name="file" class="upload" onchange="Javascript:validate_img(this);"> 4 <input id="subBtn" class="btn" type="submit" title="提交" value="提交"/> 5 </form>
图片上传到服务器，数据库里存储的是文件的上传路径，用字段filePath存储。
uploadController.java
1 @Controller 2 public class uploadController{ 3 4 @Autowired 5 private HdCommunicationService hdCommunicationService; 6 7 @RequestMapping(value = "/insertAnswerInfo") 8 public ModelAndView insertPersonalAnswer(@RequestParam(value = "file", required = false) MultipartFile file, 9 HttpServletRequest request, HttpServletResponse response, 10 ModelAndView model) { 11 12 //String realPath = request.getSession().getServletContext().getRealPath("/upload"); 13 14 String url = " "; 15 try { 16 url = UploadFileUtil.multipartUploadUtil(file, request); 17 } catch (IOException e) { 18 19 e.printStackTrace(); 20 } catch (Exception e) { 21 22 e.printStackTrace(); 23 } 24 String content = request.getParameter("answerContent"); 25 26 HdCommunication communication = new HdCommunication(); 27 communication.setContent(content); 28 communication.setFilePath(url); 29 hdCommunicationService.insertPersonQuestion(communication); 30 31 model.setViewName("redirect:/userMain.action?userName="+idcard+"&password="+password); 32 33 return model; 34 35 } 36 37 }
工具类：UploadFileUtil.java
1 public class UploadFileUtil {/** 2 * 3 * <b>功能：上传</b><br> 4 * <br> 5 * @Author:predestinate 6 * @param file:要上传的文件 7 * @param request 8 * @return 返回上传的路径+文件名，可直接保存到数据库 9 * @throws Exception 10 * @throws IOException String 11 * 12 */public static String multipartUploadUtil(MultipartFile file,HttpServletRequest request) throws Exception, IOException { 13 14 String result = ""; 15 //如果参数为空则返回空if(file == null ){ 16 return result; 17 } 18 19 //获取文件名称 20 String filename = file.getOriginalFilename(); 21 22 //获取文件扩展名 23 String extension = FilenameUtils.getExtension(filename); 24 25 if(filename!=null && !filename.equals("") && extension!=null && !extension.equals("")){ 26 27 //图片名称生成策略：采用时间格式(精确到秒)并追加随机5位(10以内)数字 28 DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss"); 29 String fileDate = df.format(new Date()); 30 31 //年月日时分秒_五位随机数.扩展名 32 String picName = "/upload/"+fileDate+"_"+UploadFileUtil.getFixLenthString(5)+"."+extension; 33 //获取文件上传路径 34 Properties prop = new Properties(); 35 InputStream in = UploadFileUtil.class.getResourceAsStream("/resources/uploadFileURL.properties"); 36 prop.load(in); 37 String absoluteURL = prop.getProperty("absoluteURL"); 38 39 File targetFile = new File(absoluteURL,picName); 40 41 // 创建父级目录 42 File p = targetFile.getParentFile(); 43 if(!p.exists()){ 44 p.mkdirs(); 45 } 46 //如果路径不存在，就创建if(!targetFile.exists()){ 47 targetFile.mkdirs(); 48 } 49 50 file.transferTo(targetFile); 51 52 String basePath = request.getScheme() + "://" + request.getServerName() 53 + ":" + request.getServerPort(); 54 55 return basePath+absoluteURL+picName; 56 } 57 58 return result; 59 } 60 61 /* 62 * 返回长度为【strLength】的随机数，在前面补0 63 */private static String getFixLenthString(int strLength) { 64 65 Random rm = new Random(); 66 67 // 获得随机数double pross = (1 + rm.nextDouble()) * Math.pow(10, strLength); 68 69 // 将获得的获得随机数转化为字符串 70 String fixLenthString = String.valueOf(pross); 71 72 // 返回固定的长度的随机数return fixLenthString.substring(1, strLength + 1); 73 } 74 75 }
properties配置文件：resources目录下的uploadFileURL.properties
1 absoluteURL=/文件名 2 //例如absoluteURL=abb
