使用Spring Boot上传文件

最新推荐文章于 2023-03-30 23:14:20 发布

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最新推荐文章于 2023-03-30 23:14:20 发布

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文章标签： java python

原文链接：https://my.oschina.net/crazyharry/blog/1105202

本文介绍了如何在SpringMVC中实现文件上传功能，包括添加commons-fileupload依赖、创建文件上传Action方法、设置文件大小限制及捕获上传异常。

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添加commons-fileupload依赖包

        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.2.2</version>
        </dependency>

创建Action方法

例如,下面的代码为一段简单的上传文件Action示例代码

@RequestMapping(value = "/simple", method = RequestMethod.POST)
    public Map simple(String name, MultipartFile file) {
        Map map = new HashMap();
        if (!file.isEmpty()) {
            try {
                byte[] bytes = file.getBytes();
                BufferedOutputStream stream =
                        new BufferedOutputStream(new FileOutputStream(new File(name)));
                stream.write(bytes);
                stream.close();
                return map;
            } catch (Exception e) {
                return map;
            }
        } else {
            return map;
        }

    }

限制上传文件的最大允许值

    @Bean
    public MultipartResolver resolver() {
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        //将文件大小的检验解析放在框架里处理
        resolver.setResolveLazily(true);
        resolver.setMaxUploadSize(2048);
        return resolver;
    }

捕获因文件大小超出最大允许极限值引发的异常

@ExceptionHandler(MaxUploadSizeExceededException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public @ResponseBody Map handleException(MaxUploadSizeExceededException ex, HttpServletRequest request) {
        Map result = new HashMap();
        result.put("error", "exceed max file sieze,upload error");
        return result;
    }

转载于:https://my.oschina.net/crazyharry/blog/1105202