fastdfs-client-java工具类封装

FastDFS是通过StorageClient来执行上传操作的

通过看源码我们知道，FastDFS有两个StorageClient工具类。

StorageClient的上传方法upload_file(...)返回的是字符串数组String[]，

如[group1,M00/00/00/wKgAb1dBK2iANrayAA1rIuRd3Es112.jpg]

StorageClient1的上传方法upload_file(...)返回的是字符串数组String，

如group1/M00/00/00/wKgAb1dBK2iANrayAA1rIuRd3Es112.jpg，也就是已经帮我们拼接好了

所以使用StorageClient1的上传方法更方便，不用我们自己拼接了。

FastDFSClient

public class FastDFSClient {
    private TrackerClient trackerClient = null;
    private TrackerServer trackerServer = null;
    private StorageServer storageServer = null;
    //使用StorageClient1进行上传
    private StorageClient1 storageClient1 = null;

    public FastDFSClient(String conf) throws Exception {
        //获取classpath路径下配置文件"fdfs_client.conf"的路径
        //conf直接写相对于classpath的位置，不需要写classpath:
        String configPath = this.getClass().getClassLoader().getResource(conf).getFile();
        System.out.println(configPath);
        ClientGlobal.init(configPath);

        trackerClient = new TrackerClient();
        trackerServer = trackerClient.getConnection();
        storageServer = trackerClient.getStoreStorage(trackerServer);
        storageClient1 = new StorageClient1(trackerServer, storageServer);
    }

    public String uploadFile(byte[] file_buff, String file_ext_name) throws Exception {

        String result = storageClient1.upload_file1(file_buff, file_ext_name, null);

        return result;
    }

    public String uploadFile(String local_filename, String file_ext_name) throws Exception {

        String result = storageClient1.upload_file1(local_filename, file_ext_name, null);

        return result;
    }
}

测试

public class FastDFSTest {
    public static void main(String[] args) throws Exception {
        //不要带classpath
        FastDFSClient client = new FastDFSClient("properties/fdfs_client.conf");
        String result = client.uploadFile("C:\\Users\\Public\\Pictures\\Sample Pictures\\Chrysanthemum.jpg", "jpg");
        System.out.println(result);
    }
}

在项目中，图片上传的实现

Service层

@Service
public class PictureServiceImpl implements PictureService {

    //将需要拼接的ip地址写在配置文件中，交给spring管理
    @Value("${IAMGE_SERVER_BASE_UEL}")
    private String IAMGE_SERVER_BASE_UEL;

    @Override
    public PictureResult uploadPic(MultipartFile picFile) {

        PictureResult result = new PictureResult();

        //判断图片是否为空
        if (picFile.isEmpty()) {
            result.setError(1);
            result.setMessage("图片为空");
            return result;
        }
        //上传到图片服务器
        try {
            //获取图片扩展名
            String originalFilename = picFile.getOriginalFilename();
            //取扩展名，不要"."
            String extName = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
            FastDFSClient client = new FastDFSClient("properties/fdfs_client.conf");
            String url = client.uploadFile(picFile.getBytes(), extName);

            //拼接图片服务器的ip的地址(写配置文件中)
            url = IAMGE_SERVER_BASE_UEL + url;

            //把url响应给客户端
            result.setError(0);
            result.setUrl(url);

        } catch (Exception e) {
            e.printStackTrace();
            result.setError(1);
            result.setMessage("图片上传失败");
        }
        return result;
    }
}

表现层

@Controller
public class PictureController {

    @Autowired
    PictureService pictureService;

    @RequestMapping("/pic/upload")
    @ResponseBody
    public PictureResult uploadFile(MultipartFile uploadFile){
        PictureResult result = pictureService.uploadPic(uploadFile);
        return result;
    }
}

经测试发现，chrome可以正常上传，但是firefox不能，说明兼容性有问题

这就要求我们将返回的数据转换成一个字符串文本，浏览器对字符串的兼容性最好、

封装一个工具类

JsonUtils

import java.util.List;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonUtils {

    // 定义jackson对象
    private static final ObjectMapper MAPPER = new ObjectMapper();

    /**
     * 将对象转换成json字符串。
     */
    public static String objectToJson(Object data) {
        try {
            String string = MAPPER.writeValueAsString(data);
            return string;
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将json结果集转化为对象
     */
    public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
        try {
            T t = MAPPER.readValue(jsonData, beanType);
            return t;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将json数据转换成pojo对象list
     */
    public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
        JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
        try {
            List<T> list = MAPPER.readValue(jsonData, javaType);
            return list;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

}

修改后的controller

@Controller
public class PictureController {

    @Autowired
    PictureService pictureService;

    @RequestMapping("/pic/upload")
    @ResponseBody
    public String uploadFile(MultipartFile uploadFile){
        PictureResult result = pictureService.uploadPic(uploadFile);
        //需要把java对象转换成json数据
        String json = JsonUtils.objectToJson(result);
        return json;
    }
}