FastDFS之java客户端使用

为了方便应用程序的访问FastDFS，官网提供了fastdfs-client-java，以便更好的与应用程序结合使用。

下载fastdfs-client-java源码添加到项目工程里面，添加配置文件：fdfs_client.conf

connect_timeout=3
network_timeout = 60
charset = ISO8859-1
http.tracker_http_port = 8080
http.anti_steal_token = no
http.secret_key = FastDFS1234567890
tracker_server = 192.168.18.43:22122

测试代码：

package cn.slimsmart.fastdfs;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;

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


/**
 *  基本操作
 */
public class FastDFSTest {

	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		//加载配置文件的方式
		String configFileName = "src/main/resources/fdfs_client.conf";  
        try {  
            ClientGlobal.init(configFileName);  
        }catch(Exception e){
        	e.printStackTrace();
        }
        
        /*
         * 也可以使用代码设置配置
         // 连接超时的时限
        ClientGlobal.setG_connect_timeout(2);
        // 网络超时的时限，单位为秒
        ClientGlobal.setG_network_timeout(30);
        ClientGlobal.setG_anti_steal_token(false);
        // 字符集
        ClientGlobal.setG_charset("UTF-8");
        ClientGlobal.setG_secret_key(null);
        // HTTP访问服务的端口号
        ClientGlobal.setG_tracker_http_port(8088);
        // Tracker服务器列表
        InetSocketAddress[] tracker_servers = new InetSocketAddress[1];
        tracker_servers[0] = new InetSocketAddress("192.168.18.43", 22122);
        ClientGlobal.setG_tracker_group(new TrackerGroup(tracker_servers));
         */
       File file = new File("src/main/resources/test.jpg");
       //返回储存路径:group1 M00/00/00/wKhuW1Vmj6KAZ09pAAC9przUxEk788.jpg
       String[] files =  uploadFile(file, "test.jpg", file.length());
       System.out.println(Arrays.asList(files));
      
      //下载文件
      downloadFile(files[0],files[1]);
      //查看文件信息
      getFileInfo(files[0],files[1]);
      getFileMate(files[0],files[1]);
      deleteFile(files[0],files[1]);
	}

	/**
	 * 上传文件
	 */
	public static String[] uploadFile(File file, String uploadFileName, long fileLength) throws IOException {
		 System.out.println("上传文件=======================");
		byte[] fileBuff = getFileBuffer(new FileInputStream(file), fileLength);
		String[] files = null;
		String fileExtName = "";
		if (uploadFileName.contains(".")) {
			fileExtName = uploadFileName.substring(uploadFileName.lastIndexOf(".") + 1);
		} else {
			System.out.println("Fail to upload file, because the format of filename is illegal.");
			return null;
		}

		// 建立连接
		TrackerClient tracker = new TrackerClient();
		TrackerServer trackerServer = tracker.getConnection();
		StorageServer storageServer = null;
		StorageClient client = new StorageClient(trackerServer, storageServer);

		// 设置元信息
		NameValuePair[] metaList = new NameValuePair[3];
		metaList[0] = new NameValuePair("fileName", uploadFileName);
		metaList[1] = new NameValuePair("fileExtName", fileExtName);
		metaList[2] = new NameValuePair("fileLength", String.valueOf(fileLength));

		// 上传文件
		try {
			files = client.upload_file(fileBuff, fileExtName, metaList);
		} catch (Exception e) {
			System.out.println("Upload file \"" + uploadFileName + "\"fails");
		}
		trackerServer.close();
		return files;
	}
	private static byte[] getFileBuffer(InputStream inStream, long fileLength) throws IOException {

		byte[] buffer = new byte[256 * 1024];
		byte[] fileBuffer = new byte[(int) fileLength];

		int count = 0;
		int length = 0;

		while ((length = inStream.read(buffer)) != -1) {
			for (int i = 0; i < length; ++i) {
				fileBuffer[count + i] = buffer[i];
			}
			count += length;
		}
		return fileBuffer;
	}
	
	//下载文件
	public static void downloadFile(String groupName,String filepath) throws Exception{
		 System.out.println("下载文件=======================");
		 TrackerClient tracker = new TrackerClient();
         TrackerServer trackerServer = tracker.getConnection();
         StorageServer storageServer = null;

         StorageClient storageClient = new StorageClient(trackerServer, storageServer);
         byte[] b = storageClient.download_file(groupName, filepath);
         System.out.println("文件大小:"+b.length);
         String fileName = "src/main/resources/test1.jpg";  
         FileOutputStream out = new FileOutputStream(fileName);
         out.write(b);
         out.flush();
         out.close();
	}
	
	//查看文件信息
	public static void getFileInfo(String groupName,String filepath) throws Exception{
		System.out.println("获取文件信息=======================");
	    TrackerClient tracker = new TrackerClient();
        TrackerServer trackerServer = tracker.getConnection();
        StorageServer storageServer = null;

        StorageClient storageClient = new StorageClient(trackerServer, storageServer);
        FileInfo fi = storageClient.get_file_info(groupName,filepath);
        System.out.println("所在服务器地址:"+fi.getSourceIpAddr());
        System.out.println("文件大小:"+fi.getFileSize());
        System.out.println("文件创建时间:"+fi.getCreateTimestamp());
        System.out.println("文件CRC32 signature:"+fi.getCrc32());
	}
	
	public static void getFileMate(String groupName,String filepath) throws Exception{
		System.out.println("获取文件Mate=======================");
		TrackerClient tracker = new TrackerClient();
        TrackerServer trackerServer = tracker.getConnection();
        StorageServer storageServer = null;

        StorageClient storageClient = new StorageClient(trackerServer, storageServer);
        NameValuePair nvps[] = storageClient.get_metadata(groupName,filepath);
        for (NameValuePair nvp : nvps) {
                System.out.println(nvp.getName() + ":" + nvp.getValue());
        }
	}
	
	public static void deleteFile(String groupName,String filepath) throws Exception{
		System.out.println("删除文件=======================");
        TrackerClient tracker = new TrackerClient();
        TrackerServer trackerServer = tracker.getConnection();
        StorageServer storageServer = null;
        StorageClient storageClient = new StorageClient(trackerServer, storageServer);
        int i = storageClient.delete_file(groupName, filepath);
        System.out.println(i == 0 ? "删除成功" : "删除失败:" + i);
	}
}

本实例中我们使用了StorageClient完成文件的基本操作，除此外还有一个实现类 StorageClient1，这里就不演示了。

上面我们是通过字节的方式上传文件，也可以使用流的方式上传文件，请参考：以流的方式上传文件的客户端代码

另外，还有一客户端FastdfsClient，基于官方fastdfs-client-java客户端基础上，实现了连接池、健康检查等功能。大家可以尝试一下。