这篇文章主要讲解了基于Java写minio客户端实现上传下载文件的方法，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

前言：

　　确保已经安装了minio的服务端

代码：

pom.xml

<dependency> <groupId>io.minio</groupId> <artifactId>minio</artifactId> <version>7.0.2</version></dependency>

application.yml

server: port:90minio: url: http://10.69.94.140:9000 accessKey: 账号 secretKey: 密码 defaultFolder: /

MinioProperties.java

@ConfigurationProperties("minio")@Datapublic class MinioProperties { private String url; private String accessKey; private String secretKey; private String defaultFolder;}

SpringConfig.java

@Configuration@EnableConfigurationProperties(MinioProperties.class)@Slf4jpublic class SpringConfig { @Autowired private MinioProperties minioProperties; @Bean public MinioClient minioClient() { try { return new MinioClient(minioProperties.getUrl(), minioProperties.getAccessKey(), minioProperties.getSecretKey()); } catch (Exception e) { log.error(e.toString()); } return null; }}

ImagesController.java

@RestController@RequestMapping("/image")@Slf4j@CrossOrigin(origins = "*")public class ImageController { @Autowired private FileService fileService; /******* * Get image file, this method return an image type file which can be displayed in browser. * @param bucketName, system, each system should belong a special bucket. * @param category, a system may contain multiple category * @param fileName */ @GetMapping(value = "/get/{bucketName}/{category}/{objectName}/{fileName}", produces = MediaType.IMAGE_JPEG_VALUE) public byte[] get(@PathVariable("bucketName") String bucketName, @PathVariable("category") String category, @PathVariable("objectName") String objectName, @PathVariable("fileName") String fileName) throws Exception { return fileService.getFile(bucketName, category, objectName); } @GetMapping("/download/{bucketName}/{category}/{objectName}/{fileName}") public void download(@PathVariable("bucketName") String bucketName, @PathVariable("category") String category, @PathVariable("objectName") String objectName, @PathVariable("fileName") String fileName, HttpServletResponse response) throws Exception { byte[] buffer = fileService.getFile(bucketName, category, objectName); response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE); response.setHeader("Content-disposition", "attachment; filename=\"" + fileName + "\""); response.getOutputStream().write(buffer); response.flushBuffer(); response.getOutputStream().close(); } @PostMapping("/upload/{bucketName}/{category}") public String upload(@PathVariable("bucketName") String bucketName, @PathVariable("category") String category, @RequestParam("file") MultipartFile file) throws Exception { String objectName = UUID.randomUUID().toString(); fileService.storeFile(bucketName, category, objectName, file.getBytes()); return String.format("image/get/%s/%s/%s/%s", bucketName, category, objectName, file.getOriginalFilename()); }}

FilesController.java

@RestController@RequestMapping("/files")@Slf4j@CrossOrigin(origins = "*")public class FilesController { @Autowired private FileService fileService; @GetMapping("/download/{bucketName}/{category}/{objectName}/{fileName}") public void download(@PathVariable("bucketName") String bucketName, @PathVariable("category") String category, @PathVariable("objectName") String objectName, @PathVariable("fileName") String fileName, HttpServletResponse response) throws Exception { byte[] buffer = fileService.getFile(bucketName, category, objectName); response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE); response.setHeader("Content-disposition", "attachment; filename=\"" + fileName + "\""); response.getOutputStream().write(buffer); response.flushBuffer(); response.getOutputStream().close(); } @PostMapping("/upload/{bucketName}/{category}") public String upload(@PathVariable("bucketName") String bucketName, @PathVariable("category") String category, @RequestParam("file") MultipartFile file) throws Exception { String objectName = UUID.randomUUID().toString(); fileService.storeFile(bucketName, category, objectName, file.getBytes()); return String.format("files/download/%s/%s/%s/%s", bucketName, category, objectName, file.getOriginalFilename()); }}

upload.html

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Upload file test</title></head><body> <form action="http://localhost:90/image/upload/zeng/test" method="post" enctype="multipart/form-data"> <input type="file" name="file" /> <input type="submit" value="Submit"> </form></body></html>

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