fastdfs使用实战（Java实例篇）

一、创建一个maven的webproject，叫file-manager:mvnarchetype:create-DgroupId=platform.activity.filemanager-DartifactId=file-manager-DarchetypeArtifactId=maven-archetype-webapp
二、定义一个fastDFS的客户端文件fdfs_client.conf：

connect_timeout = 2
network_timeout = 30
charset = UTF-8
http.tracker_http_port = 8080
http.anti_steal_token = no
http.secret_key = FastDFS1234567890

tracker_server = 192.168.1.156:22122
#tracker_server = 192.168.1.188:22122

#storage_server = 192.168.1.155:23000 #no need here

三、定义一个配置接口：

/**
 * 
 */
package com.chuanliu.platform.activity.fm.manager;

import java.io.Serializable;

/**
 * @author Josh Wang(Sheng)
 *
 * @email  [e-mail]
 */
public interface FileManagerConfig extends Serializable {

	public static final String FILE_DEFAULT_WIDTH 	= "120";
	public static final String FILE_DEFAULT_HEIGHT 	= "120";
	public static final String FILE_DEFAULT_AUTHOR 	= "Diandi";
	
	public static final String PROTOCOL = "http://";
	public static final String SEPARATOR = "/";
	
	public static final String TRACKER_NGNIX_PORT 	= "8080";
	
	public static final String CLIENT_CONFIG_FILE   = "fdfs_client.conf";
	
	
}

四、封装一个FastDFS文件Bean

/**
 * 
 */
package com.chuanliu.platform.activity.fm.manager;


/**
 * @author Josh Wang(Sheng)
 *
 * @email  [e-mail]
 */
public class FastDFSFile implements FileManagerConfig {

	private static final long serialVersionUID = -996760121932438618L;

	private String name;
	
	private byte[] content;
	
	private String ext;
	
	private String height = FILE_DEFAULT_HEIGHT;
	
	private String width = FILE_DEFAULT_WIDTH;
	
	private String author = FILE_DEFAULT_AUTHOR;
	
	public FastDFSFile(String name, byte[] content, String ext, String height,
			String width, String author) {
		super();
		this.name = name;
		this.content = content;
		this.ext = ext;
		this.height = height;
		this.width = width;
		this.author = author;
	}
	
	public FastDFSFile(String name, byte[] content, String ext) {
		super();
		this.name = name;
		this.content = content;
		this.ext = ext;
	}

	public byte[] getContent() {
		return content;
	}

	public void setContent(byte[] content) {
		this.content = content;
	}

	public String getExt() {
		return ext;
	}

	public void setExt(String ext) {
		this.ext = ext;
	}

	public String getHeight() {
		return height;
	}

	public void setHeight(String height) {
		this.height = height;
	}

	public String getWidth() {
		return width;
	}

	public void setWidth(String width) {
		this.width = width;
	}

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
}

五、定义核心的FileManager类，里面包含有上传、删除、获取文件的方法：

/**
 * 
 */
package com.chuanliu.platform.activity.fm.manager;

import java.io.File;
import java.io.IOException;

import org.apache.log4j.Logger;
import org.csource.common.NameValuePair;
import org.csource.fastdfs.ClientGlobal;
import org.csource.fastdfs.FileInfo;
import org.csource.fastdfs.ServerInfo;
import org.csource.fastdfs.StorageClient;
import org.csource.fastdfs.StorageServer;
import org.csource.fastdfs.TrackerClient;
import org.csource.fastdfs.TrackerServer;

import com.chuanliu.platform.activity.basic.util.LoggerUtils;

/**
 * File Manager used to provide the services to upload / download / delete the files
 * from FastDFS.
 * 
 * <note>In this version, FileManager only support single tracker, will enhance this later...</note>
 * 
 * @author Josh Wang(Sheng)
 *
 * @email  [e-mail]
 */
public class FileManager implements FileManagerConfig {
	
	private static final long serialVersionUID = 1L;

	private static Logger logger  = Logger.getLogger(FileManager.class);
	
	private static TrackerClient  trackerClient;
	private static TrackerServer  trackerServer;
	private static StorageServer  storageServer;
	private static StorageClient  storageClient;

	static { // Initialize Fast DFS Client configurations
		
		try {
			String classPath = new File(FileManager.class.getResource("/").getFile()).getCanonicalPath();
			
			String fdfsClientConfigFilePath = classPath + File.separator + CLIENT_CONFIG_FILE;
			
			logger.info("Fast DFS configuration file path:" + fdfsClientConfigFilePath);
			ClientGlobal.init(fdfsClientConfigFilePath);
			
			trackerClient = new TrackerClient();
			trackerServer = trackerClient.getConnection();
			
			storageClient = new StorageClient(trackerServer, storageServer);
			
		} catch (Exception e) {
			LoggerUtils.error(logger,  e);
			
		}
	}
	
	
	
	public static String upload(FastDFSFile file) {
		LoggerUtils.info(logger, "File Name: " + file.getName() + "		File Length: " + file.getContent().length);
		
		NameValuePair[] meta_list = new NameValuePair[3];
	    meta_list[0] = new NameValuePair("width", "120");
	    meta_list[1] = new NameValuePair("heigth", "120");
	    meta_list[2] = new NameValuePair("author", "Diandi");
		
	    long startTime = System.currentTimeMillis();
		String[] uploadResults = null;
		try {
			uploadResults = storageClient.upload_file(file.getContent(), file.getExt(), meta_list);
		} catch (IOException e) {
			logger.error("IO Exception when uploadind the file: " + file.getName(), e);
		} catch (Exception e) {
			logger.error("Non IO Exception when uploadind the file: " + file.getName(), e);
		}
		logger.info("upload_file time used: " + (System.currentTimeMillis() - startTime) + " ms");
		
		if (uploadResults == null) {
			LoggerUtils.error(logger, "upload file fail, error code: " + storageClient.getErrorCode());
		}
		
		String groupName 		= uploadResults[0];
		String remoteFileName   = uploadResults[1];
		
		String fileAbsolutePath = PROTOCOL + trackerServer.getInetSocketAddress().getHostName() 
				+ SEPARATOR
				+ TRACKER_NGNIX_PORT
				+ SEPARATOR 
				+ groupName 
				+ SEPARATOR 
				+ remoteFileName;
		
		
		LoggerUtils.info(logger, "upload file successfully!!!  " +"group_name: " + groupName + ", remoteFileName:"
				+ " " + remoteFileName);
		
		return fileAbsolutePath;
		
	}
	
	public static FileInfo getFile(String groupName, String remoteFileName) {
		try {
			return storageClient.get_file_info(groupName, remoteFileName);
		} catch (IOException e) {
			logger.error("IO Exception: Get File from Fast DFS failed", e);
		} catch (Exception e) {
			logger.error("Non IO Exception: Get File from Fast DFS failed", e);
		}
		return null;
	}
	
	public static void deleteFile(String groupName, String remoteFileName) throws Exception {
		storageClient.delete_file(groupName, remoteFileName);
	}
	
	public static StorageServer[] getStoreStorages(String groupName) throws IOException {
		return trackerClient.getStoreStorages(trackerServer, groupName);
	}
	
	public static ServerInfo[] getFetchStorages(String groupName, String remoteFileName) throws IOException {
		return trackerClient.getFetchStorages(trackerServer, groupName, remoteFileName);
	}
}

六、Unit Test测试类

package manager;
/**
 * 
 */


import java.io.File;
import java.io.FileInputStream;

import org.csource.fastdfs.FileInfo;
import org.csource.fastdfs.ServerInfo;
import org.csource.fastdfs.StorageServer;
import org.junit.Test;
import org.springframework.util.Assert;

import com.chuanliu.platform.activity.fm.manager.FastDFSFile;
import com.chuanliu.platform.activity.fm.manager.FileManager;

/**
 * @author Josh Wang(Sheng)
 *
 * @email  [e-mail]
 */
public class TestFileManager {

	@Test
	public void upload() throws Exception {
		File content = new File("C:\\520.jpg");
		
		FileInputStream fis = new FileInputStream(content);
	    byte[] file_buff = null;
	    if (fis != null) {
	    	int len = fis.available();
	    	file_buff = new byte[len];
	    	fis.read(file_buff);
	    }
		
		FastDFSFile file = new FastDFSFile("520", file_buff, "jpg");
		
		String fileAbsolutePath = FileManager.upload(file);
		System.out.println(fileAbsolutePath);
		fis.close();
	}
	
	@Test
	public void getFile() throws Exception {
		FileInfo file = FileManager.getFile("group1", "M00/00/00/wKgBm1N1-CiANRLmAABygPyzdlw073.jpg");
		Assert.notNull(file);
		String sourceIpAddr = file.getSourceIpAddr();
	    long size = file.getFileSize();
	    System.out.println("ip:" + sourceIpAddr + ",size:" + size);
	}
	
	@Test
	public void getStorageServer() throws Exception {
		StorageServer[] ss = FileManager.getStoreStorages("group1");
		Assert.notNull(ss);
		
		for (int k = 0; k < ss.length; k++){
			System.err.println(k + 1 + ". " + ss[k].getInetSocketAddress().getAddress().getHostAddress() + ":" + ss[k].getInetSocketAddress().getPort());
	    }
	}
	
	@Test
	public void getFetchStorages() throws Exception {
		ServerInfo[] servers = FileManager.getFetchStorages("group1", "M00/00/00/wKgBm1N1-CiANRLmAABygPyzdlw073.jpg");
		Assert.notNull(servers);
		
		for (int k = 0; k < servers.length; k++) {
    		System.err.println(k + 1 + ". " + servers[k].getIpAddr() + ":" + servers[k].getPort());
    	}
	}
	
}

文章来自: 程序员俱乐部(www.cxyclub.cn) 详文参考：http://www.cxyclub.cn/n/44103/