详解SpringMVC实现图片上传以及该注意的小细节
先附上图片上传的代码
jsp代码如下:
<form action="${path}/upload/uploadPic.do" method="post" enctype="multipart/form-data"> <div> ![](${path}/mall/image/load_image.png) <input type="file" id="input-image" name="input-image"> <input id="input-relative-path" name="imgs" type="hidden" > <input id="input-last-path" type="hidden"> <input type="submit" value="上传图片"> </div> </form>
controller代码:通过spring的方式实现
@Controller @RequestMapping("/upload") public class UploadController extends BaseController { @RequestMapping(value = "/uploadPic", method = RequestMethod.POST) @LoginCheck public void uploadPic(HttpServletRequest request, PrintWriter out, String lastRealPath) throws IOException { // 将当前上下文初始化给CommonsMultipartResolver CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext()); // 检查form中是否有enctype="multipart/form-data" if (resolver.isMultipart(request)) { // 强制转化request MultipartHttpServletRequest req = (MultipartHttpServletRequest) request; // 从表单获取input名称 Iterator<String> iterable = req.getFileNames(); // 存在文件 if (iterable.hasNext()) { String inputName = iterable.next(); // 获得文件 MultipartFile mf = req.getFile(inputName); byte[] mfs = mf.getBytes(); // 定义文件名 String fileName = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()); Random random = new Random(); for (int i = 0; i < 3; i++) { fileName = fileName + random.nextInt(10); } // 获得后缀名 String oriFileName = mf.getOriginalFilename(); String suffix = oriFileName.substring(oriFileName.lastIndexOf(".")); // 上传图片到本地 String localPath = "/Users/ZR/Desktop/webPro/console/src/main/webapp/image/" + fileName + suffix; mf.transferTo(new File(localPath)); // 获取图片的宽高 BufferedImage bufferedImage = ImageIO.read(new FileInputStream(new File(localPath))); int width = bufferedImage.getWidth(); int height = bufferedImage.getHeight(); // 获取文件大小 long size = mf.getSize(); } } } }
spring-mvc.xml代码:
<!-- 文件上传的视图解析器,id值是固定的 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="1024000"/> <!-- 其他属性 --> </bean>
功能的实现其实很简单,但是对于初学者还是需要注意如下几个点
- form上的enctype="multipart/form-data"不能忘记。
- <input type="file" onchange="submitUpload()" id="input-image" name="input-image"> 的name标签可以随便取名,但是不能忽略,否则Iterator<String> iterable = req.getFileNames();这边获取的集合将为空。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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