fileupload上传文件

jar包commons-fileupload-1.3.1.jar
首先配置文件servlet中要加上

<mvc:default-servlet-handler />
    <!-- 实现SpringMVC的注解驱动 -->
    <mvc:annotation-driven/>
    <!-- 用于文件上传 设置最大支持200M-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
        p:defaultEncoding="UTF-8"
        p:maxUploadSize="209715200"/><!-- 单位是字节 -->
</beans>

//上传文件
    @RequestMapping("/uploadPdf")
    @ResponseBody
    public  String uploadPdf(@RequestParam("file") MultipartFile file)throws IllegalStateException, IOException{
        String type = file.getContentType();
        if (!type.contains("pdf")) {
            return  "type error";
        }
        String tomcatPath = this.getClass().getClassLoader().getResource("/")
                .getPath();
        String uploadPath = tomcatPath.substring(1,tomcatPath.length()-16) +"uploadFiles/"+file.getOriginalFilename();
//            String uploadPath = "D:\\MyEclipseWorkspaces\\JCI\\WebRoot\\uploadFiles\\"+file.getOriginalFilename();;
//        System.out.println("-----"+uploadPath);
        if(!file.isEmpty()){
            file.transferTo(new File(uploadPath));
            uploadPdfBiz.analysisPdf(uploadPath);
            return  "success";
        }else{
            return  "file empty";
        }
    }