springBoot中文件上传功能Api
01) 实现工具类FileUtil
package com.example.fei.common.utils; import org.springframework.web.multipart.MultipartFile; import java.io.*; //文件上传工具类 public class FileUtil { public static void uploadFile(byte[] file,String filePath,String fileName) throws IOException { File targetFile = new File(filePath); if (!targetFile.exists()) { // 创建目录 targetFile.mkdirs(); } FileOutputStream out = new FileOutputStream(filePath + fileName); out.write(file); out.flush(); out.close(); } public static void uploadFile2(InputStream fileStream, String filePath, String fileName) throws IOException { File targetFile = new File(filePath); if (!targetFile.exists()) { // 创建目录 targetFile.mkdirs(); } FileOutputStream out = new FileOutputStream(filePath + fileName); //开始复制 int i = 0; byte[] bytes = new byte[1024]; while((i = fileStream.read(bytes))!=-1) { out.write(bytes, 0, i); } out.close(); fileStream.close(); } // 采用MultipartFile的transfer() 实现上传 public static void uploadFile3(MultipartFile uploadFile, String filePath, String fileName) throws IOException { File targetFile = new File(filePath + fileName); uploadFile.transferTo(targetFile); } }
02) 在 Controller 中写方法
package com.example.fei.controller; import com.example.fei.common.utils.FileUtil; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; @RestController @RequestMapping("/file") public class FileController { // 上传文件 @PostMapping("upload") public void upload(@RequestParam("file") MultipartFile file) { // String contentType = file.getContentType(); // 获取文件类型 String fileName = file.getOriginalFilename(); // 图片名字 String filePath = "E:\\self_web\\git_dev\\vue\\zFei_springBoot\\target\\"; try { FileUtil.uploadFile(file.getBytes(), filePath, fileName); } catch (Exception e) { // TODO: 处理异常信息 } } // 上传文件2 @PostMapping("upload2") public void upload2(@RequestParam("file") MultipartFile uploadFile) { String fileName = uploadFile.getOriginalFilename(); String filePath = "E:\\self_web\\git_dev\\vue\\zFei_springBoot\\target\\"; try { FileUtil.uploadFile2(uploadFile.getInputStream(), filePath, fileName); } catch (Exception e) { // TODO: 处理异常信息 } } // 上传文件3 @PostMapping("upload3") public void upload3(@RequestParam("file") MultipartFile uploadFile) { String fileName = uploadFile.getOriginalFilename(); String filePath = "E:\\self_web\\git_dev\\vue\\zFei_springBoot\\target\\"; try { FileUtil.uploadFile3(uploadFile, filePath, fileName); } catch (Exception e) { // TODO: 处理异常信息 } } // 下载文件 @GetMapping("download") public void download() { } }
03) postman 测试