### 实现图片预览
功能
为了实现基于Spring Boot和
MinIO的图片预览服务，可以按照如下方式构建应用程序。此方法允许上传图像到
MinIO服务器并提供HTTP接口用于获取这些文件以便于前端展示。
#### 创建Spring Boot项目结构
首先创建一个新的Spring Boot应用，在`pom.xml`中加入必要的依赖项来支持Web开发以及对象存储操作：
```xml
<dependencies>
<!-- Web support -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--
MinIO client library -->
<dependency>
<groupId>io.min.io</groupId>
<artifactId|
minio|version>8.4.3</artifactId>
</dependency>
...
</dependencies>
```
####
配置MinIO连接属性
在项目的
配置文件application.properties里定义访问
MinIO所需的信息：
```properties
minio.endpoint=http://localhost:9000
minio.accessKey=YOUR_ACCESS_KEY
minio.secretKey=YOUR_SECRET_KEY
minio.bucketName=image-preview-bucket
```
#### 编写Controller处理请求
接下来编写控制器类以接收来自客户端的文件上传请求并将它们保存至指定桶内；同时也应暴露API供读取已存入的对象数据流返回给调用者显示出来。
```java
@RestController
@RequestMapping
("/api/images"
)
public class ImagePreviewController {
private final
MinioClient
minioClient;
private static final String BUCKET_NAME;
@Autowired
public ImagePreviewController
(MinioClient
minioClient, @Value
("${
minio.bucketName}"
) String bucketName
) {
this.
minioClient =
minioClient;
BUCKET_NAME = bucketName;
try {
if
(!this.
minioClient.bucketExists
(BucketExistsArgs.builder
().bucket
(bucketName
).build
())) {
this.
minioClient.makeBucket
(MakeBucketArgs.builder
().bucket
(bucketName
).build
());
}
} catch
(Exception e
) {
throw new RuntimeException
(e
);
}
}
/**
* Uploads a file to
MinIO.
*/
@PostMapping
(consumes = MediaType.MULTIPART_FORM_DATA_VALUE
)
public ResponseEntity<String> uploadFile
(@RequestParam
("file"
) MultipartFile multipartFile
) throws Exception {
PutObjectArgs objectArgs = PutObjectArgs.builder
()
.stream
(multipartFile.getInputStream
(), multipartFile.getSize
(), -1L
)
.object
(multipartFile.getOriginalFilename
())
.contentType
(MediaType.IMAGE_JPEG_VALUE
)// or other types as needed
.bucket
(BUCKET_NAME
)
.build
();
minioClient.putObject
(objectArgs
);
return ResponseEntity.ok
("Successfully uploaded"
);
}
/**
* Retrieves an image from
MinIO by its name.
*/
@GetMapping
(value="/{imageName}", produces = {MediaType.IMAGE_JPEG_VALUE}
)
public void getImageByName
(HttpServletResponse response,
@PathVariable
("imageName"
) String imageName
) throws IOException {
GetObjectResponse getObjectResponse = null;
InputStream inputStream = null;
try {
StatObjectResponse statObjRes =
minioClient.statObject
(StatObjectArgs.builder
().bucket
(BUCKET_NAME
).object
(imageName
).build
());
// Set content type based on actual MIME type of stored objects
response.setContentType
(statObjRes.contentType
());
getObjectResponse =
minioClient.getObject
(GetObjectArgs.builder
().bucket
(BUCKET_NAME
).object
(imageName
).build
());
IOUtils.copy
(getObjectResponse, response.getOutputStream
());
} finally {
if
(getObjectResponse != null
){
getObjectResponse.close
();
}
}
}
}
```
通过上述代码片段可见，当接收到POST请求时会将传来的二进制数据流转储成对应名称的新资源放置于预先设定好的容器之中[^3]；而GET请求则负责依据路径参数定位特定条目并通过响应体直接传输原始字节序列回送给浏览器端解析渲染[^4]。
本文详细指导了在Windows10上安装Minio，包括下载、配置文件夹、启动服务、获取AccessKey和SecretKey，以及在RuoYiPlus中配置Minio并测试文件上传的过程。
第四步，运行成功后不要关闭cmd窗口，打开下面的网址
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