SpringBoot系列-文件上传处理

前言

SpringBoot开发遇到文件上传的问题，getRealPath(“/upload”)在SpringBoot中对应的路径在tmp目录下，每次启动都会改变，不再适合保存文件。本文记录下SpringBoot框架下上传文件到自定义目录并生成对应可存储的网络路径方法。

步骤1

application.properties中添加本地路径的配置

upload.path = H:/images

步骤二

创建类继承WebMvcConfigurerAdapter并添加路径映射

@Configuration
public class MyWebConfigurer
        extends WebMvcConfigurerAdapter {

    @Autowired
    private Environment env;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/images/**").addResourceLocations("file:" + env.getProperty("upload.path") + "/");
        super.addResourceHandlers(registry);
    }

}

步骤三

上传文件处理

@Controller
public class UploadController {

    // The Environment object will be used to read parameters from the
    // application.properties configuration file
    @Autowired
    private Environment env;
    
    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
    @ResponseBody
    public ResponseEntity<?> uploadFile(
            @RequestParam("file") MultipartFile multipartFile) {

        /**获取配置的本地路径* */
        String rootPathDir = env.getProperty("upload.path");
        /**构建按照日期存储的本地路径**/
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd/HH");
        String fullPathDir = rootPathDir + File.separator + dateFormat.format(new Date());
        /**根据本地路径创建目录**/
        File fullPathFile = new File(fullPathDir);
        if (!fullPathFile.exists())
            fullPathFile.mkdirs();
        /** 获取文件的后缀* */
        String suffix = multipartFile.getOriginalFilename().substring(
                multipartFile.getOriginalFilename().lastIndexOf("."));
        /** 使用UUID生成文件名称* */
        String fileName = UUID.randomUUID().toString() + suffix;
        /** 拼成完整的文件保存路径加文件* */
        String filePath = fullPathFile + File.separator + fileName;
        /** 文件输出流* */
        File file = new File(filePath);
        try (FileOutputStream fileOutputStream = new FileOutputStream(file);
             BufferedOutputStream stream = new BufferedOutputStream(fileOutputStream)) {
            stream.write(multipartFile.getBytes());
            /** 打印出上传到服务器的文件的本地路径和网络路径* */
            System.out.println("****************" + filePath + "**************");
            System.out.println("/images/" + dateFormat.format(new Date()) + "/" + fileName);
        } catch (Exception e) {
            System.out.println(e.getMessage());
            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
        }
        return new ResponseEntity<>(HttpStatus.OK);
    }
}

运行结果

控制台输出，网络路径用于存储到数据库

****************H:\images\2016\06\14\08\489b66e4-438b-443a-ab21-5c93de35ae9a.jpg**************
/images/2016/06/14/08/489b66e4-438b-443a-ab21-5c93de35ae9a.jpg

参考

SpringMVC—>Controller获得上传文件的绝对路径

Spring Boot 静态资源处理

spring boot应用启动原理分析