public class FastDFSTest {

    @Test
    public void testFileUpload() throws Exception {
        // 1、加载配置文件，配置文件中的内容就是tracker服务的地址。
        ClientGlobal.init("D:/workspaces-itcast/e3-manager-web/src/main/resources/resource/client.conf");
        // 2、创建一个TrackerClient对象。直接new一个。
        TrackerClient trackerClient = new TrackerClient();
        // 3、使用TrackerClient对象创建连接，获得一个TrackerServer对象。
        TrackerServer trackerServer = trackerClient.getConnection();
        // 4、创建一个StorageServer的引用，值为null
        StorageServer storageServer = null;
        // 5、创建一个StorageClient对象，需要两个参数TrackerServer对象、StorageServer的引用
        StorageClient storageClient = new StorageClient(trackerServer, storageServer);
        // 6、使用StorageClient对象上传图片。
        //扩展名不带“.”
        String[] strings = storageClient.upload_file("D:/Documents/Pictures/images/200811281555127886.jpg", "jpg", null);
        // 7、返回数组。包含组名和图片的路径。
        for (String string : strings) {
            System.out.println(string);
        }
    }
}

@Test
    public void testFastDfsClient() throws Exception {
        FastDFSClient fastDFSClient = new FastDFSClient("D:/workspaces-itcast/e3-manager-web/src/main/resources/resource/client.conf");
        String file = fastDFSClient.uploadFile("D:/Documents/Pictures/images/2f2eb938943d.jpg");
        System.out.println(file);
    }

<!-- 定义文件上传解析器 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设定默认编码 -->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!-- 设定文件上传的最大值5MB，5*1024*1024 -->
        <property name="maxUploadSize" value="5242880"></property>
    </bean>

@Controller
public class PictureController {
    
    @Value("${IMAGE_SERVER_URL}")
    private String IMAGE_SERVER_URL;

    @RequestMapping("/pic/upload")
    @ResponseBody
    public Map fileUpload(MultipartFile uploadFile) {
        try {
            //1、取文件的扩展名
            String originalFilename = uploadFile.getOriginalFilename();
            String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
            //2、创建一个FastDFS的客户端
            FastDFSClient fastDFSClient = new FastDFSClient("classpath:resource/client.conf");
            //3、执行上传处理
            String path = fastDFSClient.uploadFile(uploadFile.getBytes(), extName);
            //4、拼接返回的url和ip地址，拼装成完整的url
            String url = IMAGE_SERVER_URL + path;
            //5、返回map
            Map result = new HashMap<>();
            result.put("error", 0);
            result.put("url", url);
            return result;
        } catch (Exception e) {
            e.printStackTrace();
            //5、返回map
            Map result = new HashMap<>();
            result.put("error", 1);
            result.put("message", "图片上传失败");
            return result;
        }
    }
}

@Override
    public E3Result addItem(TbItem item, String desc) {
        // 1、生成商品id
        long itemId = IDUtils.genItemId();
        // 2、补全TbItem对象的属性
        item.setId(itemId);
        //商品状态，1-正常，2-下架，3-删除
        item.setStatus((byte) 1);
        Date date = new Date();
        item.setCreated(date);
        item.setUpdated(date);
        // 3、向商品表插入数据
        itemMapper.insert(item);
        // 4、创建一个TbItemDesc对象
        TbItemDesc itemDesc = new TbItemDesc();
        // 5、补全TbItemDesc的属性
        itemDesc.setItemId(itemId);
        itemDesc.setItemDesc(desc);
        itemDesc.setCreated(date);
        itemDesc.setUpdated(date);
        // 6、向商品描述表插入数据
        itemDescMapper.insert(itemDesc);
        // 7、E3Result.ok()
        return E3Result.ok();
    }

@RequestMapping(value = "/save",method = RequestMethod.POST)
    @ResponseBody
    public E3Result saveItem(TbItem item, String desc) {
        E3Result result = itemService.addItem(item, desc);
        return result;
    }