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

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        org.springframework.boot
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        spring-boot-starter-web
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        org.springframework.boot
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        spring-boot-starter-test
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        test
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        org.springframework.boot
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        spring-boot-starter-thymeleaf
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编写Controller层

1     @Controller   2     public class FileUploadController {   3        4         private static final Logger logger = LoggerFactory.getLogger(FileUploadController.class);   5        6         /**  7          * 跳转到单个文件上传  8          *  9          * @return 10          */  11         @RequestMapping(value = "/upload", method = RequestMethod.GET)  12         public ModelAndView upload() {  13             return new ModelAndView("/fileUpload");  14         }  15       16         /** 17          * 跳转到多个文件上传 18          * 19          * @return 20          */  21         @RequestMapping(value = "/upload/batch", method = RequestMethod.GET)  22         public ModelAndView batchUpload() {  23             return new ModelAndView("/multiFileUpload");  24         }  25       26         /** 27          * 文件上传具体实现方法（单文件上传） 28          * 29          * @param file 30          * @return 31          */  32         @RequestMapping(value = "/upload", method = RequestMethod.POST)  33         @ResponseBody  34         public String upload(@RequestParam("file") MultipartFile file) {  35             try {  36                 if (file.isEmpty()) {  37                     return "文件为空";  38                 }  39                 // 获取文件名  40                 String fileName = file.getOriginalFilename();  41                 logger.info("上传的文件名为：" + fileName);  42                 // 获取文件的后缀名  43                 String suffixName = fileName.substring(fileName.lastIndexOf("."));  44                 logger.info("文件的后缀名为：" + suffixName);  45       46                 // 设置文件存储路径  47                 String filePath = "E://xuchen//";  48                 String path = filePath + fileName + suffixName;  49       50                 File dest = new File(path);  51                 // 检测是否存在目录  52                 if (!dest.getParentFile().exists()) {  53                     dest.getParentFile().mkdirs();// 新建文件夹  54                 }  55                 file.transferTo(dest);  56                 return "上传成功";  57             } catch (IllegalStateException e) {  58                 e.printStackTrace();  59             } catch (IOException e) {  60                 e.printStackTrace();  61             }  62             return "上传失败";  63         }  64       65         /** 66          * 多文件上传 67          * 68          * @param request 69          * @return 70          */  71         @RequestMapping(value = "/upload/batch", method = RequestMethod.POST)  72         @ResponseBody  73         public String batchUpload(HttpServletRequest request) {  74             List
     
       files = ((MultipartHttpServletRequest) request).getFiles("file");  75             MultipartFile file;  76             BufferedOutputStream stream;  77             for (int i = 0; i < files.size(); ++i) {  78                 file = files.get(i);  79                 if (!file.isEmpty()) {  80                     try {  81                         byte[] bytes = file.getBytes();  82                         stream = new BufferedOutputStream(new FileOutputStream(new File(file.getOriginalFilename())));  83                         stream.write(bytes);  84                         stream.close();  85                     } catch (Exception e) {  86                         stream = null;  87                         return "文件上传失败 " + i + " => " + e.getMessage();  88                     }  89                 } else {  90                     return "文件上传失败 " + i + "原因:上传文件为空！";  91                 }  92             }  93             return "文件上传成功";  94         }  95     }
     

文件上传相关配置

1     @Configuration   2     public class FileUploadConfiguration {   3        4         @Bean   5         public MultipartConfigElement multipartConfigElement() {   6             MultipartConfigFactory factory = new MultipartConfigFactory();   7             // 设置文件大小限制 ,超出设置页面会抛出异常信息，   8             // 这样在文件上传的地方就需要进行异常信息的处理了;   9             factory.setMaxFileSize("2MB");  10             /// 设置总上传数据总大小  11             factory.setMaxRequestSize("5MB");  12             return factory.createMultipartConfig();  13         }  14     }

前端页面(单个上传)

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文件上传示例
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测试结果

Demo源码下载地址：