本文研究的主要是java fastdfs客戶端使用實例的相關內容，具體實現如下。
什么是FastDFS？
FastDFS是用c語言編寫的一款開源的分布式文件系統。FastDFS為互聯網量身定制，充分考慮了冗余備份、負載均衡、線性擴容等機制，并注重高可用、高性能等指標，使用FastDFS很容易搭建一套高性能的文件服務器集群提供文件上傳、下載等服務。
FastDFS架構
FastDFS架構包括 Tracker server和Storage server?？蛻舳苏埱骉racker server進行文件上傳、下載，通過Tracker server調度最終由Storage server完成文件上傳和下載。Tracker server作用是負載均衡和調度，通過Tracker server在文件上傳時可以根據一些策略找到Storage server提供文件上傳服務?？梢詫racker稱為追蹤服務器或調度服務器。Storage server作用是文件存儲，客戶端上傳的文件最終存儲在Storage服務器上，Storage server沒有實現自己的文件系統而是利用操作系統 的文件系統來管理文件?？梢詫torage稱為存儲服務器。
實例
一、創建一個maven的webproject，叫
file-manager:mvnarchetype:create-DgroupId=platform.activity.filemanager-DartifactId=file-manager-DarchetypeArtifactId=maven-archetype-webapp
二、定義一個fastDFS的客戶端文件fdfs_client.conf：
class="properties" name="code">connect_timeout = 2network_timeout = 30charset = UTF-8http.tracker_http_port = 8080http.anti_steal_token = nohttp.secret_key = FastDFS1234567890tracker_server = 192.168.1.156:22122#tracker_server = 192.168.1.188:22122#storage_server = 192.168.1.155:23000 #no need here
三、定義一個配置接口：
package com.chuanliu.platform.activity.fm.manager;import java.io.Serializable;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、封裝一個FastDFS文件Bean
package com.chuanliu.platform.activity.fm.manager;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、定義核心的FileManager類，里面包含有上傳、刪除、獲取文件的方法：
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;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測試類
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 josh_wang23@hotmail.com */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()); } }}總結
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