SpringBoot之文件上传

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新建一个SpringBoot项目：SpringBoot–uploadfile
工程目录：
这里写图片描述

pom.xml依赖：

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

FileUploadConfiguration文件信息配置：

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("256KB"); // KB,MB        /// 设置总上传数据总大小        factory.setMaxRequestSize("512KB");        // Sets the directory location where files will be stored.        // factory.setLocation("路径地址");        return factory.createMultipartConfig();    }}

Controller类：

@Controllerpublic class FileUploadController {     @RequestMapping(value = "/upload", method = RequestMethod.GET)     public String upload() {         return "/fileupload";     }     @RequestMapping(value = "/upload/batch", method = RequestMethod.GET)     public String batchUpload() {         return "/mutifileupload";     }        @RequestMapping(value = "/upload", method = RequestMethod.POST)        @ResponseBody        public String upload(@RequestParam("file") MultipartFile file) {            if (!file.isEmpty()) {                try {                    // 这里只是简单例子，文件直接输出到项目路径下。                    // 实际项目中，文件需要输出到指定位置，需要在增加代码处理。                    // 还有关于文件格式限制、文件大小限制，详见：中配置。                    BufferedOutputStream out = new BufferedOutputStream(                            new FileOutputStream(new File(file.getOriginalFilename())));                    out.write(file.getBytes());                    out.flush();                    out.close();                } catch (FileNotFoundException e) {                    e.printStackTrace();                    return "上传失败," + e.getMessage();                } catch (IOException e) {                    e.printStackTrace();                    return "上传失败," + e.getMessage();                }                return "上传成功";            } else {                return "上传失败，因为文件是空的.";            }        }        /**         * 多文件上传 主要是使用了MultipartHttpServletRequest和MultipartFile         *         */        @RequestMapping(value = "/upload/batch", method = RequestMethod.POST)        public @ResponseBody String batchUpload(HttpServletRequest request) {            List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");            MultipartFile file = null;            BufferedOutputStream stream = null;            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 "You failed to upload " + i + " => " + e.getMessage();                    }                } else {                    return "You failed to upload " + i + " because the file was empty.";                }            }            return "upload successful";        }}

HTML文件配置：
单文件：

<title>文件上传示例</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>

批量文件：

<title>批量文件上传示例</title></head><body>    <h2>批量文件上传示例</h2>    <hr/>    <form method="POST" enctype="multipart/form-data"        action="/upload/batch">        <p>            文件1：<input type="file" name="file" />        </p>        <p>            文件2：<input type="file" name="file" />        </p>        <p>            文件3：<input type="file" name="file" />        </p>        <p>            <input type="submit" value="上传" />        </p>    </form></body></html>

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