java fastdfs客户端使用实例代码
本文研究的主要是java fastdfs客户端使用实例的相关内容,具体实现如下。
什么是FastDFS?
FastDFS是用c语言编写的一款开源的分布式文件系统。FastDFS为互联网量身定制,充分考虑了冗余备份、负载均衡、线性扩容等机制,并注重高可用、高性能等指标,使用FastDFS很容易搭建一套高性能的文件服务器集群提供文件上传、下载等服务。
FastDFS架构
FastDFS架构包括 Tracker server和Storage server。客户端请求Tracker server进行文件上传、下载,通过Tracker server调度最终由Storage server完成文件上传和下载。Tracker server作用是负载均衡和调度,通过Tracker server在文件上传时可以根据一些策略找到Storage server提供文件上传服务。可以将tracker称为追踪服务器或调度服务器。Storage server作用是文件存储,客户端上传的文件最终存储在Storage服务器上,Storage server没有实现自己的文件系统而是利用操作系统 的文件系统来管理文件。可以将storage称为存储服务器。
实例
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:
class="properties" name="code">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; 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; 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; 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 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()); } } }
总结
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