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public class FileUploadConstant {
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    //文件上传路径
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    public static String FILE_UPLOAD_PATH = "C:/Users/images/";
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    //文件访问路径
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    public static String FILE_VIVSI_PATH = "http://localhost:8080/image/";
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}

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    //静态资源映射
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    registry.addResourceHandler("/image/**")//虚拟地址
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    .addResourceLocations("file:C:/Users/images/");//本地存储地址

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    @PostMapping("/upload")
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    @ApiOperation("文件上传")
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    public Result<String> upload(MultipartFile file) {
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        try {
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            //原始文件名
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            String originalFileName = file.getOriginalFilename();
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            //截取原始文件名后缀
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            String extension = originalFileName.substring(originalFileName.lastIndexOf("."));
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            //构造新文件名
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            String newFileName = UUID.randomUUID().toString() + extension;
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            //生成文件路径
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            String filePath = FileUploadConstant.FILE_UPLOAD_PATH + newFileName;
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            //保存文件到文件路径
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            file.transferTo(new File(filePath));
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            //返回文件访问路径
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            return Result.success(FileUploadConstant.FILE_VIVSI_PATH + newFileName);
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        } catch (IOException e) {
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            log.error("文件上传失败：{ }", e);
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        }
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         //返回文件上传失败
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        return Result.success(MessageConstant.UPLOAD_FAILED);
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    }