使用java调用fastDFS客户端进行静态资源文件上传

一、背景

　　上篇博客我介绍了FastDFS的概念、原理以及安装步骤，这篇文章我们来聊一聊如何在java中使用FastDFSClient进行静态资源的上传。

二、使用步骤

　　1.开发环境

　　　　spring+springmvc+maven

　　2.首先在maven的pom.xml中引入依赖fastdfs-client的依赖

<dependency>
   <groupId>org.csource</groupId>
   <artifactId>fastdfs-client-java</artifactId>
   <version>5.0.4</version>
</dependency>

　　3.接着我们来指定一个fastdfs-client.conf配置文件，里面内容如下：

　　　　tracker_server=host:port(这里指trackerServer服务器的ip和端口)

　　4.然后写一个单元测试类来测试服务

package com.hafiz.fastdfs;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.csource.common.MyException;
import org.csource.fastdfs.ClientGlobal;
import org.csource.fastdfs.StorageClient;
import org.csource.fastdfs.StorageServer;
import org.csource.fastdfs.TrackerClient;
import org.csource.fastdfs.TrackerServer;
import org.junit.Test;

import com.taotao.common.utils.FastDFSClient;

public class FastdfsTest {
    
    private static final String CONFIGLOCATION = "D:\fastdfs_client.conf";

    @Test
    public void testUploadImg () {
        try {
            // 初始化全局配置。加载client配置文件
            ClientGlobal.init(CONFIGLOCATION);
            // 创建一个TrackerClient对象
            TrackerClient trackerClient = new TrackerClient();
            // 创建一个TrackerServer对象
            TrackerServer trackerServer = trackerClient.getConnection();
            // 声明一个StorageServer对象并初始为null
            StorageServer storageServer = null;
            // 获得StorageClient对象
            StorageClient storageClient = new StorageClient(trackerServer, storageServer);
            // 直接调用StorageClient对象方法上传文件即可
            String[] result = storageClient.upload_file("D:\Documents\Downloads\高圆圆2.jpg", "jpg", null);
            for(String item : result) {
                System.out.println(item);
            }
            trackerServer.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (MyException e) {
            e.printStackTrace();
        }
    }
    
    @Test
    public void fastDfsClientTest() {
        try {
            FastDFSClient client = new FastDFSClient(CONFIGLOCATION);
            String imgUrl = client.uploadFile("D:\Documents\Downloads\高圆圆1.jpg", "jpg", null);
            System.out.println(imgUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

　　5.为了以后在项目中使用方便，我们不能每次都写这么一大串东西，所以我们来对该客户端进行以下封装：

package com.hafiz.common.utils;

import org.csource.common.NameValuePair;
import org.csource.fastdfs.ClientGlobal;
import org.csource.fastdfs.StorageClient1;
import org.csource.fastdfs.StorageServer;
import org.csource.fastdfs.TrackerClient;
import org.csource.fastdfs.TrackerServer;

public class FastDFSClient {
    
    private TrackerClient trackerClient = null;
    private TrackerServer trackerServer = null;
    private StorageServer storageServer = null;
    private StorageClient1 storageClient = null;

    public FastDFSClient(String conf) throws Exception {

        if (conf.contains("classpath:")) {
            String url = this.getClass().getResource("/").getPath();
            url = url.substring(1);
            conf = conf.replace("classpath:", url);
        }
        ClientGlobal.init(conf);
        trackerClient = new TrackerClient();
        trackerServer = trackerClient.getConnection();
        storageServer = null;
        storageClient = new StorageClient1(trackerServer, storageServer);
    }

    public String uploadFile(String fileName, String extName, NameValuePair[] metas) throws Exception {
        return storageClient.upload_file1(fileName, extName, metas);
    }
    public String uploadFile(String fileName, String extName) throws Exception {
        return storageClient.upload_file1(fileName, extName, null);
    }

    public String uploadFile(String fileName) throws Exception {
        return storageClient.upload_file1(fileName, null, null);
    }
    public String uploadFile(byte[] fileContent, String extName, NameValuePair[] metas) throws Exception {
        return storageClient.upload_file1(fileContent, extName, metas);
    }
    public String uploadFile(byte[] fileContent, String extName) throws Exception {
        return storageClient.upload_file1(fileContent, extName, null);
    }
    public String uploadFile(byte[] fileContent) throws Exception {
        return storageClient.upload_file1(fileContent, null, null);
    }

}

三、总结

　　通过以上的步骤，我们就完成在java中使用fastdfs客户端进行静态资源上传的功能，这里面我们得到一个最重要的思想就是：DRY（Don't Repeat Yourself!），要有封装的思想。