Java操作FastDFS示例代码

/** * Copyright (C) 2008 Happy Fish / YuQing * * FastDFS Java Client may be copied only under the terms of the GNU Lesser * General Public License (LGPL). * Please visit the FastDFS Home Page http://www.csource.org/ for more detail. */ package org.csource.fastdfs; import java.io.IOException; import java.io.OutputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.FileInputStream; import java.io.File; import java.util.Arrays; import java.net.Socket; import org.csource.common.MyException; import org.csource.common.NameValuePair; import org.csource.common.Base64; /** * Storage client for 2 fields file id: group name and filename * @author Happy Fish / YuQing * @version Version 1.24 */ public class StorageClient { /** * Upload file by file buff * @author Happy Fish / YuQing * @version Version 1.12 */ public static class UploadBuff implements UploadCallback { private byte[] fileBuff; private int offset; private int length; /** * constructor * @param fileBuff the file buff for uploading */ public UploadBuff(byte[] fileBuff, int offset, int length) { super(); this.fileBuff = fileBuff; this.offset = offset; this.length = length; } /** * send file content callback function, be called only once when the file uploaded * @param out output stream for writing file content * @return 0 success, return none zero(errno) if fail */ public int send(OutputStream out) throws IOException { out.write(this.fileBuff, this.offset, this.length); return 0; } } public final static Base64 base64 = new Base64('-', '_', '.', 0); protected TrackerServer trackerServer; protected StorageServer storageServer; protected byte errno; /** * constructor using global settings in class ClientGlobal */ public StorageClient() { this.trackerServer = null; this.storageServer = null; } /** * constructor with tracker server and storage server * @param trackerServer the tracker server, can be null * @param storageServer the storage server, can be null */ public StorageClient(TrackerServer trackerServer, StorageServer storageServer) { this.trackerServer = trackerServer; this.storageServer = storageServer; } /** * get the error code of last call * @return the error code of last call */ public byte getErrorCode() { return this.errno; } /** * upload file to storage server (by file name) * @param local_filename local filename to upload * @param file_ext_name file ext name, do not include dot(.), null to extract ext name from the local filename * @param meta_list meta info array * @return 2 elements string array if success:<br> * <ul><li>results[0]: the group name to store the file </li></ul> * <ul><li>results[1]: the new created filename</li></ul> * return null if fail */ public String[] upload_file(String local_filename, String file_ext_name, NameValuePair[] meta_list) throws IOException, MyException { final String group_name = null; return this.upload_file(group_name, local_filename, file_ext_name, meta_list); } /** * upload file to storage server (by file name) * @param group_name the group name to upload file to, can be empty * @param local_filename local filename to upload * @param file_ext_name file ext name, do not include dot(.), null to extract ext name from the local filename * @param meta_list meta info array * @return 2 elements string array if success:<br> * <ul><li>results[0]: the group name to store the file </li></ul> * <ul><li>results[1]: the new created filename</li></ul> * return null if fail */ protected String[] upload_file(String group_name, String local_filename, String file_ext_name, NameValuePair[] meta_list) throws IOException, MyException { final byte cmd = ProtoCommon.STORAGE_PROTO_CMD_UPLOAD_FILE; return this.upload_file(cmd, group_name, local_filename, file_ext_name, meta_list); } /** * upload file to storage server (by file name) * @param cmd the command * @param group_name the group name to upload file to, can be empty * @param local_filename local filename to upload * @param file_ext_name file ext name, do not include dot(.), null to extract ext name from the local filename * @param meta_list meta info array * @return 2 elements string array if success:<br> * <ul><li>results[0]: the group name to store the file </li></ul> * <ul><li>results[1]: the new created filename</li></ul> * return null if fail */ protected String[] upload_file(byte cmd, String group_name, String local_filename, String file_ext_name, NameValuePair[] meta_list) throws IOException, MyException { File f = new File(local_filename); FileInputStream fis = new FileInputStream(f); if (file_ext_name == null) { int nPos = local_filename.lastIndexOf('.'); if (nPos > 0 && local_filename.length() - nPos <= ProtoCommon.FDFS_FILE_EXT_NAME_MAX_LEN + 1) { file_ext_name = local_filename.substring(nPos+1); } } try { return this.do_upload_file(cmd, group_name, null, null, file_ext_name, f.length(), new UploadStream(fis, f.length()), meta_list); } finally { fis.close(); } } /** * upload file to storage server (by file buff) * @param file_buff file content/buff * @param offset start offset of the buff * @param length the length of buff to upload * @param file_ext_name file ext name, do not include dot(.) * @param meta_list meta info array * @return 2 elements string array if success:<br> * <ul><li>results[0]: the group name to store the file</li></ul> * <ul><li>results[1]: the new created filename</li></ul> * return null if fail */ public String[] upload_file(byte[] file_buff, int offset, int length, String file_ext_name, NameValuePair[] meta_list) throws IOException, MyException { final String group_name = null; return this.upload_file(group_name, file_buff, offset, length, file_ext_name, meta_list); } /** * upload file to storage server (by file buff) * @param group_name the group name to upload file to, can be empty * @param file_buff file content/buff * @param offset start offset of the buff * @param length the length of buff to upload * @param file_ext_name file ext name, do not include dot(.) * @param meta_list meta info array * @return 2 elements string array if success:<br> * <ul><li>results[0]: the group name to store the file</li></ul> * <ul><li>results[1]: the new created filename</li></ul> * return null if fail */ public String[] upload_file(String group_name, byte[] file_buff, int offset, int length, String file_ext_name, NameValuePair[] meta_list) throws IOException, MyException { return this.do_upload_file(ProtoCommon.STORAGE_PROTO_CMD_UPLOAD_FILE, group_name, null, null, file_ext_name, length, new UploadBuff(file_buff, offset, length), meta_list); } /** * upload file to storage server (by file buff) * @param file_buff file content/buff * @param file_ext_name file ext name, do not include dot(.) * @param meta_list meta info array * @return 2 elements string array if success:<br> * <ul><li>results[0]: the group name to store the file</li></ul> * <ul><li>results[1]: the new created filename</li></ul> * return null if fail */ public String[] upload_file(byte[] file_buff, String file_ext_name, NameValuePair[] meta_list) throws IOException, MyException { final String group_name = null; return this.upload_file(group_name, file_buff, 0, file_buff.length, file_ext_name, meta_list); } /** * upload file to storage server (by file buff) * @param group_name the group name to upload file to, can be empty * @param file_buff file content/buff * @param file_ext_name file ext name, do not include dot(.) * @param meta_list meta info array * @return 2 elements string ar