Spring Boot 整合 FastDFS 客户端

一、前言

前两篇介绍整体上介绍了通过 Nginx 和 FastDFS 的整合来实现文件服务器。但是，在实际开发中对图片或文件的操作都是通过应用程序来完成的，因此，本篇将介绍 Spring Boot 整合 FastDFS 客户端来实现对图片/文件服务器的访问。

如果有不了解 FastDFS 的读者可以先浏览《FastDFS 环境搭建》和《Nginx 整合 FastDFS 实现文件服务器》来普及内容，或是另行查阅网上相关资料。

二、整合编码

2.1 添加依赖

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-test</artifactId>
	<scope>test</scope>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
    <scope>true</scope>
</dependency>

<dependency>
    <groupId>com.github.tobato</groupId>
    <artifactId>fastdfs-client</artifactId>
    <version>1.26.3</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

上边的 fastdfs-client 是并非 FastDFS Client 原作者编写的整合包，具体详情可以访问 https://github.com/tobato/FastDFS_Client 。

2.2 application.properties

server.port=8080

# fastDFS 配置
fdfs.so-timeout=1501
fdfs.connect-timeout=601
fdfs.thumb-image.width=150
fdfs.thumb-image.height=150
fdfs.web-server-url=192.168.10.110/
fdfs.tracker-list[0]=192.168.10.110:22122

2.3 后端代码

加载 FastDFS 配置类：

@Configuration
@Import(FdfsClientConfig.class)
// 解决jmx重复注册bean的问题
@EnableMBeanExport(registration = RegistrationPolicy.IGNORE_EXISTING)
public class ComponetImport {
    // 导入依赖组件
}

FastDFS 工具类：

@Component
public class FastDFSClient {

    private final Logger logger = LoggerFactory.getLogger(FastDFSClient.class);

    @Autowired
    private FastFileStorageClient storageClient;

    @Autowired
    private FdfsWebServer fdfsWebServer;

    /**
     * 上传文件
     * @param file 文件对象
     * @return 文件访问地址
     * @throws IOException
     */
    public String uploadFile(MultipartFile file) throws IOException {
        StorePath storePath = storageClient.uploadFile(file.getInputStream(),file.getSize(), FilenameUtils.getExtension(file.getOriginalFilename()),null);
        return getResAccessUrl(storePath);
    }

    /**
     * 上传文件
     * @param file 文件对象
     * @return 文件访问地址
     * @throws IOException
     */
    public String uploadFile(File file) throws IOException {
        FileInputStream inputStream = new FileInputStream (file);
        StorePath storePath = storageClient.uploadFile(inputStream,file.length(), FilenameUtils.getExtension(file.getName()),null);
        return getResAccessUrl(storePath);
    }

    /**
     * 将一段字符串生成一个文件上传
     * @param content 文件内容
     * @param fileExtension
     * @return
     */
    public String uploadFile(String content, String fileExtension) {
        byte[] buff = content.getBytes(Charset.forName("UTF-8"));
        ByteArrayInputStream stream = new ByteArrayInputStream(buff);
        StorePath storePath = storageClient.uploadFile(stream,buff.length, fileExtension,null);
        return getResAccessUrl(storePath);
    }

    // 封装图片完整URL地址
    private String getResAccessUrl(StorePath storePath) {
        String fileUrl = fdfsWebServer.getWebServerUrl() + storePath.getFullPath();
        return fileUrl;
    }
    
    /**
     * 下载文件
     * @param fileUrl 文件url
     * @return
     */
    public byte[]  download(String fileUrl) {
    	 String group = fileUrl.substring(0, fileUrl.indexOf("/"));
         String path = fileUrl.substring(fileUrl.indexOf("/") + 1);
         byte[] bytes = storageClient.downloadFile(group, path, new DownloadByteArray());
         return bytes;
    }

    /**
     * 删除文件
     * @param fileUrl 文件访问地址
     * @return
     */
    public void deleteFile(String fileUrl) {
        if (StringUtils.isEmpty(fileUrl)) {
            return;
        }
        try {
            StorePath storePath = StorePath.praseFromUrl(fileUrl);
            storageClient.deleteFile(storePath.getGroup(), storePath.getPath());
        } catch (FdfsUnsupportStorePathException e) {
            logger.warn(e.getMessage());
        }
    }

}

controller 类：

@RestController
@RequestMapping("/fdfs")
public class FastDFSController {
	
	@Autowired
	private FastDFSClient fdfsClient;

	/**
	 * 文件上传
	 * @param file
	 * @return
	 * @throws Exception
	 */
	@RequestMapping("/upload")
	public Map<String,Object> upload(MultipartFile file) throws Exception{
		
		String url = fdfsClient.uploadFile(file);
		
		Map<String,Object> result = new HashMap<>();
		result.put("code", 200);
		result.put("msg", "上传成功");
		result.put("url", url);
		
		return result;
	}
	
	/**
	 * 文件下载
	 * @param fileUrl  url 开头从组名开始
	 * @param response
	 * @throws Exception
	 */
	@RequestMapping("/download")
	public void  download(String fileUrl, HttpServletResponse response) throws Exception{
		
		byte[] data = fdfsClient.download(fileUrl);
		
		response.setCharacterEncoding("UTF-8");
		response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode("test.jpg", "UTF-8"));
        
		// 写出
		ServletOutputStream outputStream = response.getOutputStream();
		IOUtils.write(data, outputStream);
	}
}

2.4 前端页面

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>文件上传</title>
<link rel="stylesheet" th:href="@{/css/bootstrap.css}">
<style>
	form {
		margin-top: 30px;
	}
</style>
</head>
<body>
	<div class="container">
	
		<div class="row">
			<div class="col-md-4 col-sm-4"></div>
			<div class="col-md-4 col-sm-4">
				<h2> FastDFS 文件上传</h2>
			<form th:action="@{/fdfs/upload}" method="post" enctype="multipart/form-data">
			  <div class="form-group">
			    <input type="file" name="file" id="exampleInputFile">
			  </div>
			  <button type="submit" class="btn btn-default">上传</button>
			</form>
			</div>
			<div class="col-md-4 col-sm-4"></div>
		</div>
	</div>
</body>
</html>

三、测试

本篇只测试文件上传和访问的效果，演示图如下：

整合成功~~