FastDFS分布文件系统Java客户端使用
原文链接：http://blog.csdn.net/xyang81/article/details/52847311
FastDFS分布式文件系统服务安装和使用请参考上一篇文章《 FastDFS分布式文件系统安装与使用（单节点）》担建环境。
官网Java客户端源代码：https://github.com/happyfish100/fastdfs-client-java
我已经将源码打包成一个jar，下载后导入到你的工程中即可。如果你是用maven管理工程，可将jar包上传到公司自己担的私服中。jar下载地址：http://download.csdn.net/detail/xyang81/9656690
我将官方提供的sdk封装了一个工具类，将工具类导入工程即可使用，如下所示：
package com.digi_zones.fdfs;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtil;
import org.csource.common.NameValuePair;
import org.csource.fastdfs.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Description: FastDFS文件上传下载工具类
* Copyright: Copyright (c) 2016
*
* @author yangxin
* @version 1.0
* @date 2016/10/19
*/
public class FastDFSClient {
private static final String CONFIG_FILENAME = "src/main/resources/fdfs/fdfs_client.conf";
private static StorageClient1 storageClient1 = null;
// 初始化FastDFS Client
static {
try {
ClientGlobal.init(CONFIG_FILENAME);
TrackerClient trackerClient = new TrackerClient(ClientGlobal.g_tracker_group);
TrackerServer trackerServer = trackerClient.getConnection();
if (trackerServer == null) {
throw new IllegalStateException("getConnection return null");
}
StorageServer storageServer = trackerClient.getStoreStorage(trackerServer);
if (storageServer == null) {
throw new IllegalStateException("getStoreStorage return null");
}
storageClient1 = new StorageClient1(trackerServer,storageServer);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 上传文件
* @param file 文件对象
* @param fileName 文件名
* @return
*/
public static String uploadFile(File file, String fileName) {
return uploadFile(file,fileName,null);
}
/**
* 上传文件
* @param file 文件对象
* @param fileName 文件名
* @param metaList 文件元数据
* @return
*/
public static String uploadFile(File file, String fileName, Map metaList) {
try {
byte[] buff = IOUtil.toByteArray(new FileInputStream(file));
NameValuePair[] nameValuePairs = null;
if (metaList != null) {
nameValuePairs = new NameValuePair[metaList.size()];
int index = 0;
for (Iterator> iterator = metaList.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = iterator.next();
String name = entry.getKey();
String value = entry.getValue();
nameValuePairs[index++] = new NameValuePair(name,value);
}
}
return storageClient1.upload_file1(buff,FileUtils.getExtension(fileName),nameValuePairs);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 获取文件元数据
* @param fileId 文件ID
* @return
*/
public static Map getFileMetadata(String fileId) {
try {
NameValuePair[] metaList = storageClient1.get_metadata1(fileId);
if (metaList != null) {
HashMap map = new HashMap();
for (NameValuePair metaItem : metaList) {
map.put(metaItem.getName(),metaItem.getValue());
}
return map;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 删除文件
* @param fileId 文件ID
* @return 删除失败返回-1，否则返回0
*/
public static int deleteFile(String fileId) {
try {
return storageClient1.delete_file1(fileId);
} catch (Exception e) {
e.printStackTrace();
}
return -1;
}
/**
* 下载文件
* @param fileId 文件ID（上传文件成功后返回的ID）
* @param outFile 文件下载保存位置
* @return
*/
public static int downloadFile(String fileId, File outFile) {
FileOutputStream fos = null;
try {
byte[] content = storageClient1.download_file1(fileId);
fos = new FileOutputStream(outFile);
IOUtil.copy(content,fos);
return 0;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return -1;
}
}
Java客户端配置文件（fdfs_client.conf）：
connect_timeout = 10 # 连接tracker服务器超时时长
network_timeout = 30 # socket连接超时时长
charset = UTF-8 # 文件内容编码
http.tracker_http_port = 8888 # tracker服务器端口
http.anti_steal_token = no
http.secret_key = FastDFS1234567890
tracker_server = 192.168.0.200:22122 # tracker服务器IP和端口（可以写多个）
#tracker_server = xxxx:xxxJava客户端文件上传、下载、删除和元数据获取测试：
package com.digi_zones.fdfs;
import org.junit.Test;
import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Description:
* Copyright: Copyright (c) 2016
*
* @author yangxin
* @version 1.0
* @date 2016/10/19
*/
public class FastDFSClientTest {
/**
* 文件上传测试
*/
@Test
public void testUpload() {
File file = new File("C:\\Users\\yangfang\\Pictures\\angularjs_share.jpg");
Map metaList = new HashMap();
metaList.put("width","1024");
metaList.put("height","768");
metaList.put("author","杨信");
metaList.put("date","20161018");
String fid = FastDFSClient.uploadFile(file,file.getName(),metaList);
System.out.println("upload local file " + file.getPath() + " ok, fileid=" + fid);
//上传成功返回的文件ID： group1/M00/00/00/wKgAyVgFk9aAB8hwAA-8Q6_7tHw351.jpg
}
/**
* 文件下载测试
*/
@Test
public void testDownload() {
int r = FastDFSClient.downloadFile("group1/M00/00/00/wKgAyVgFk9aAB8hwAA-8Q6_7tHw351.jpg", new File("DownloadFile_fid.jpg"));
System.out.println(r == 0 ? "下载成功" : "下载失败");
}
/**
* 获取文件元数据测试
*/
@Test
public void testGetFileMetadata() {
Map metaList = FastDFSClient.getFileMetadata("group1/M00/00/00/wKgAyVgFk9aAB8hwAA-8Q6_7tHw351.jpg");
for (Iterator> iterator = metaList.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = iterator.next();
String name = entry.getKey();
String value = entry.getValue();
System.out.println(name + " = " + value );
}
}
/**
* 文件删除测试
*/
@Test
public void testDelete() {
int r = FastDFSClient.deleteFile("group1/M00/00/00/wKgAyVgFk9aAB8hwAA-8Q6_7tHw351.jpg");
System.out.println(r == 0 ? "删除成功" : "删除失败");
}
}