Spring MVC

• maven

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
</dependency>

• spring配置

<!--文件上传依赖配置-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"/>
        <property name="maxUploadSize" value="209715200"/>
        <property name="resolveLazily" value="true"/>
    </bean>
<!--添加aop,用于新建上传目录-->
    <aop:aspectj-autoproxy/>
    <bean id="fileAop" class="org.yiva.exam.aop.FileAop"/>

• 编码

前端

<form id="upload" class="layui-form" action="${base}/file/doUpload" method="post" enctype="multipart/form-data">
    <div class="layui-form-item">
        <label class="layui-form-label">上传文件</label>
        <div class="layui-input-block">
            <input type="file" name="uploadFile" required lay-verify="required" placeholder="请输入部门名称"
                   autocomplete="off" class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" lay-submit lay-filter="formDept">立即提交</button>
        </div>
    </div>
</form>

controller

@PostMapping(value = {"doUpload"})
    @ResponseBody
    public String upload(@RequestParam("uploadFile") MultipartFile file) throws IOException {
        logger.info(file.getOriginalFilename());
        if (!file.isEmpty()) {

            try {
                FileUtils.copyInputStreamToFile(file.getInputStream(), new File(CommonsInfo.UPDATE_PATH, file.getOriginalFilename()));
            } catch (IOException e) {
                e.printStackTrace();
            }
            return "success";
        }
        return "fail";
    }

aop

@Aspect
public class FileAop {

    private Logger logger = Logger.getLogger(FileAop.class);

    @Pointcut("execution(* org.yiva.exam.controller.FileController.upload(..))")
    public void poincutFile(){

    }

    /**
    *  在访问上传文件功能前判断是否已经存在上传文件的保存目录，如没有则新建
    */
    @Before(value = "poincutFile()")
    public void before(JoinPoint joinPoint) throws IOException {
        File folder = new File(CommonsInfo.UPDATE_PATH);
        if (!folder.isDirectory() || !folder.exists()) {
            folder.mkdirs();
            logger.info("create Directory updateFile");
        }
    }

}