Spring Mvc中CommonsMultipartFile的特性实例详解

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.1.8.RELEASE</version>
    </dependency>

<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver" />

        <multipart-config>
            <!--上传的文件的最大限制，单位byte-->
            <max-file-size>4194304</max-file-size>
            <!--multipart/form-data请求的最大限制，单位byte-->
            <max-request-size>10485760</max-request-size>
            <!--将存储上载文件的目录位置-->
            <!--<location></location>-->
        </multipart-config>

@Controller
public class UploadController {
    @RequestMapping(value = "/fileupload")
    @ResponseBody
    public String test(HttpServletRequest request) throws Exception {
        MultipartHttpServletRequest req = (MultipartHttpServletRequest)request;
        MultipartFile file = req.getFile("uploadFile");
        String realFileName = file.getOriginalFilename();
        String ctxPath = req.getSession().getServletContext().getRealPath("/tmp/");
        File dirPath = new File(ctxPath);
        if (!dirPath.exists()) {
            dirPath.mkdir();
        }
        String serverPath = ctxPath + File.separator + realFileName;
        try {
            File uploadFile = new File(serverPath);
            FileCopyUtils.copy(file.getBytes(), uploadFile);
            return serverPath;
        } catch (Exception var9) {
            var9.printStackTrace();
            return "upload fail";
        }
    }
}

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.1.8.RELEASE</version>
    </dependency>

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.1.9.RELEASE</version>
    </dependency>

    public static String upLoadFile(HttpServletRequest request) {
        MultipartHttpServletRequest req = (MultipartHttpServletRequest)request;
        MultipartFile file = req.getFile("uploadFile");
        String realFileName = file.getOriginalFilename();
        String ctxPath = request.getContextPath();
        ctxPath = req.getSession().getServletContext().getRealPath("/tmp/");
        File dirPath = new File(ctxPath);
        if (!dirPath.exists()) {
            dirPath.mkdir();
        }

        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
        String serverPath = ctxPath + File.separator + format.format(new Date()) + realFileName;

        try {
            File uploadFile = new File(serverPath);
            FileCopyUtils.copy(file.getBytes(), uploadFile);
            return serverPath;
        } catch (Exception var9) {
            var9.printStackTrace();
            return null;
        }
    }