spring-boot 文件上傳

文件上傳在spring-boot中是極爲簡單的，下面寫個簡單的demo

第一步：pom.xml加入如下jar包

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

只需引入devtools一個包即可

第二步：編寫controller層代碼

    @PostMapping("/upload")
    public String upload(@RequestParam("file")MultipartFile file,
                         RedirectAttributes redirectAttributes) throws IOException {
        if (file.isEmpty()) {
            redirectAttributes.addFlashAttribute("message", "請選擇一個文件！");
            return "redirect:uploadStatus";
        }
        byte[] bytes = file.getBytes();
        Path path = Paths.get("E:\\practiceSpace\\springbootfileupload",file.getOriginalFilename());
        Files.write(path,bytes);
        redirectAttributes.addFlashAttribute("message","上傳成功");
        return "redirect:uploadStatus";
    }

@PostMapping  也可換成 @RequestMapping

代碼中 return "redirect:uploadStatus";是返回到一個上傳結果展示頁面，

真正用於文件上傳的代碼只有如下三行：

byte[] bytes = file.getBytes();
Path path =Paths.get("E:\\practiceSpace\\springbootfileupload",file.getOriginalFilename());
Files.write(path,bytes);