37，截取文件名后缀

admin

案例：originalFilename.substring(originalFilename.lastIndexOf("."));

package com.jinhei.controller;

import com.jinhei.pojp.Result;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.util.UUID;

@RestController
@Tag(name = "附件上传")
public class FileUploadController {
    @Operation(summary = "上传接口", description = "上传")
    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file) throws Exception {
        // 获取文件原始的名字
        String originalFilename = file.getOriginalFilename();
        //保证文件的名字是唯一的,从而防止文件覆盖
        String filename = null;
        if (originalFilename != null) {
            filename = UUID.randomUUID().toString() + originalFilename.substring(originalFilename.lastIndexOf("."));
        }
        //把文件的内容存储到本地磁盘上
        file.transferTo(new File("F:\\xuexi\\file\"+filename));
        // String url = AliOssUtil.uploadFile(filename,file.getInputStream());
        return Result.success("URL上传成功");
    }
}
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