SpringBoot实现文件上传下载

配置

在application.yml中添加配置

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spring: servlet: multipart: enabled: true # 表示是否开启文件上传支持，默认为 true file-size-threshold: 0 # 表示文件写入磁盘的阀值，默认为 0 location: # 表示上传文件的临时保存位置 max-file-size: 1MB # 表示上传的单个文件的最大大小，默认为 1MB max-request-size: 10MB # 表示多文件上传时文件的总大小，默认为 10MB file: upload: url: E:/test # 上传路径

SpringBoot更改了不同版本的属性名称

SpringBoot 1.3.x及更早

1	multipart.max-file-size

SpringBoot 1.3.x之后

1	spring.http.multipart.max-file-size

SpringBoot 2.0之后

1	spring.servlet.multipart.max-file-size

文件上传

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package com.zmjwdzjl.controller; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletResponse; import java.io.*; @RestController @RequestMapping("file") @Slf4j public class FileController { @Value("${file.upload.url}") private String uploadFilePath; @PostMapping("/upload") public String httpUpload(@RequestParam("files") MultipartFile files[]) { JSONObject object = new JSONObject(); for(int i=0;i

文件下载

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@RequestMapping("/download") public String fileDownLoad(HttpServletResponse response, @RequestParam("fileName") String fileName) { File file = new File(uploadFilePath +'/'+ fileName); if(!file.exists()) { return "下载文件不存在"; } response.reset(); response.setContentType("application/octet-stream"); response.setCharacterEncoding("utf-8"); response.setContentLength((int) file.length()); response.setHeader("Content-Disposition", "attachment;filename=" + fileName ); try(BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file))) { byte[] buff = new byte[1024]; OutputStream os = response.getOutputStream(); int i = 0; while ((i = bis.read(buff)) != -1) { os.write(buff, 0, i); os.flush(); } } catch (IOException e) { log.error("{}",e); return "下载失败"; } return "下载成功"; }