SpringBoot文件上传

我们在工作中经常会遇到文件上传的需求，本文使用SpringBoot简单实现文件上传。

首先Pom.xml

    <dependencies>  
            <dependency>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-starter-web</artifactId>  
            </dependency>  
            <dependency>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-starter-test</artifactId>  
                <scope>test</scope>  
            </dependency>  
            <!-- thmleaf模板依赖. -->  
            <dependency>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-starter-thymeleaf</artifactId>  
            </dependency>  
    </dependencies>  

编写Controller层

    @Controller  
    public class FileUploadController {  
      
        private static final Logger logger = LoggerFactory.getLogger(FileUploadController.class);  
      
        /** 
         * 跳转到单个文件上传 
         * 
         * @return 
         */  
        @RequestMapping(value = "/upload", method = RequestMethod.GET)  
        public ModelAndView upload() {  
            return new ModelAndView("/fileUpload");  
        }  
      
        /** 
         * 跳转到多个文件上传 
         * 
         * @return 
         */  
        @RequestMapping(value = "/upload/batch", method = RequestMethod.GET)  
        public ModelAndView batchUpload() {  
            return new ModelAndView("/multiFileUpload");  
        }  
      
        /** 
         * 文件上传具体实现方法（单文件上传） 
         * 
         * @param file 
         * @return 
         */  
        @RequestMapping(value = "/upload", method = RequestMethod.POST)  
        @ResponseBody  
        public String upload(@RequestParam("file") MultipartFile file) {  
            try {  
                if (file.isEmpty()) {  
                    return "文件为空";  
                }  
                // 获取文件名  
                String fileName = file.getOriginalFilename();  
                logger.info("上传的文件名为：" + fileName);  
                // 获取文件的后缀名  
                String suffixName = fileName.substring(fileName.lastIndexOf("."));  
                logger.info("文件的后缀名为：" + suffixName);  
      
                // 设置文件存储路径  
                String filePath = "E://xuchen//";  
                String path = filePath + fileName + suffixName;  
      
                File dest = new File(path);  
                // 检测是否存在目录  
                if (!dest.getParentFile().exists()) {  
                    dest.getParentFile().mkdirs();// 新建文件夹  
                }  
                file.transferTo(dest);  
                return "上传成功";  
            } catch (IllegalStateException e) {  
                e.printStackTrace();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
            return "上传失败";  
        }  
      
        /** 
         * 多文件上传 
         * 
         * @param request 
         * @return 
         */  
        @RequestMapping(value = "/upload/batch", method = RequestMethod.POST)  
        @ResponseBody  
        public String batchUpload(HttpServletRequest request) {  
            List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");  
            MultipartFile file;  
            BufferedOutputStream stream;  
            for (int i = 0; i < files.size(); ++i) {  
                file = files.get(i);  
                if (!file.isEmpty()) {  
                    try {  
                        byte[] bytes = file.getBytes();  
                        stream = new BufferedOutputStream(new FileOutputStream(new File(file.getOriginalFilename())));  
                        stream.write(bytes);  
                        stream.close();  
                    } catch (Exception e) {  
                        stream = null;  
                        return "文件上传失败 " + i + " => " + e.getMessage();  
                    }  
                } else {  
                    return "文件上传失败 " + i + "原因:上传文件为空！";  
                }  
            }  
            return "文件上传成功";  
        }  
    }  

文件上传相关配置

    @Configuration  
    public class FileUploadConfiguration {  
      
        @Bean  
        public MultipartConfigElement multipartConfigElement() {  
            MultipartConfigFactory factory = new MultipartConfigFactory();  
            // 设置文件大小限制 ,超出设置页面会抛出异常信息，  
            // 这样在文件上传的地方就需要进行异常信息的处理了;  
            factory.setMaxFileSize("2MB");  
            /// 设置总上传数据总大小  
            factory.setMaxRequestSize("5MB");  
            return factory.createMultipartConfig();  
        }  
    }  

前端页面(单个上传)

    <!DOCTYPE html>  
    <html lang="en">  
    <head>  
        <meta charset="UTF-8">  
        <title>单个文件上传</title>  
    </head>  
    <body>  
    <h2>文件上传示例</h2>  
    <hr/>  
    <form method="POST" enctype="multipart/form-data" action="/upload">  
        <p>  
            文件：<input type="file" name="file"/>  
        </p>  
        <p>  
            <input type="submit" value="上传"/>  
        </p>  
    </form>  
    </body>  
    </html>  

测试结果

Demo源码下载地址：https://gitee.com/inchlifc/SpringBootTest.git