使用Java写一个minio的客户端上传下载文件

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

MinioProperties.java

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

SpringConfig.java

@Configuration
@EnableConfigurationProperties(MinioProperties.class)
@Slf4j
public 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

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<!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>