springMVC上传图片

一、需要导入springmvc文件上传的jar包，否则会出现异常java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory

二、创建上传页面form表单

<form action="upload/uploadPic.do" method="post" enctype="multipart/form-data">
        <input type="file" name="pic">
        <br>
        <input type="submit" value="submit">
    </form>

三、在springMVC配置文件中设置文件上传配置

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 以字节为单位  -->
        <property name="maxUploadSize" value="1024000"></property>
    </bean>

四、controller类的编写

//跳转到表单页
    @RequestMapping("/toForm.do")
    public String toForm(){
        return "form1";
    }
    
    //文件上传
    @RequestMapping("/uploadPic.do")
    public String uploadPic(HttpServletRequest req) throws IOException{
        MultipartHttpServletRequest mr = (MultipartHttpServletRequest) req;
        //获得文件
        MultipartFile file = mr.getFile("pic");
        //获得文件字节数组
        byte[] bs = file.getBytes();
        //根据时间及随机数创建文件名
        String fileName = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
        Random random = new Random();
        for(int i = 0;i < 3;i++){
            fileName = fileName + random.nextInt(10);
        }
        //获得文件的原始文件名
        String originalFilename = file.getOriginalFilename();
        //对原始文件名切割获得后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //获得项目路径
        String realPath = req.getSession().getServletContext().getRealPath("/");
        //创建字节输出流
        OutputStream out = new FileOutputStream(new File(realPath + "/upload/" + fileName + suffix));
        out.write(bs);
        out.flush();
        out.close();
        return "success";
    }