解决从ftp上下载音频文件大小改变的问题，ftp文件大小,甲客户那边老是说录音的音

解决从ftp上下载音频文件大小改变的问题，ftp文件大小,甲客户那边老是说录音的音

甲客户那边老是说录音的音质很差劲，但是丁客户的录音的音质无差别。用的是同一个算法，就只FTP服务器的系统不同。这个问题纠缠了我很久。经过多次试验终于发现，都是从ftp下载下来的文件比源文件要大一点。只要设置ftp下载的编码为GBK就行了。请看下面一段代码：

import java.io.IOException;import org.apache.commons.net.ftp.FTPClient;import org.apache.commons.net.ftp.FTPClientConfig;import org.apache.commons.net.ftp.FTPFile;import com.eshore.ccc.CCCLogger;public class FTP {    private String serverIp = "59.41.223.227";    private int port = 21;    private String username ="upload";    private String password = "suntekgc";    private String rootpath = "/";    private String ftptype = "1";       private FTPClient ftpClient;    public FTP() {    }    public FTP(String serverIp, int port, String username, String password, String rootpath, String ftptype) {        this.serverIp = serverIp;        this.port = port;        this.username = username;        this.password = password;        this.rootpath = rootpath;        if(this.rootpath.equals("")) this.rootpath = "/";        this.ftptype = ftptype;    }    private boolean connectFTPServer() {        this.ftpClient = new FTPClient();        try {            //String FTPSERV_TYPE = AppHandle.getHandle("ccf").getProperty("FTPSERV_TYPE", "2");            FTPClientConfig conf = null;            if(this.ftptype.equals("1"))                conf = new FTPClientConfig(FTPClientConfig.SYST_NT);            else                conf = new FTPClientConfig(FTPClientConfig.SYST_UNIX);            ftpClient.configure(conf);            ftpClient.setDataTimeout(60000);            ftpClient.setControlEncoding("GBK");            ftpClient.setDefaultTimeout(60000);            ftpClient.connect(this.serverIp, port);            boolean b = ftpClient.login(username, password);            if(b)                CCCLogger.logger.info("登录FTP服务器成功.");            else                CCCLogger.logger.info("登录FTP服务器失败.");            return b;        } catch (IOException e) {            CCCLogger.logger.error("登录FTP服务器失败", e);            return false;        }    }public boolean remoteV3ToLocal(String voxFile, String localFile) {        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        try {            if (!connectFTPServer())                  return false;            ftpClient.enterLocalPassiveMode();            ftpClient.setFileTransferMode(org.apache.commons.net.ftp.FTP.STREAM_TRANSFER_MODE);            ftpClient.setFileType(org.apache.commons.net.ftp.FTP.BINARY_FILE_TYPE);            // 转到指定下载目录            String remoteDir = "/";            String remoteFileName = voxFile;            if (voxFile.contains("/")) {                remoteDir = voxFile.substring(0, voxFile.lastIndexOf("/"));                remoteFileName = voxFile.substring(voxFile.lastIndexOf("/") + 1);            }            if(this.rootpath.endsWith("/"))                remoteDir = this.rootpath + remoteDir;            else                remoteDir = this.rootpath + "/" + remoteDir;            FTPFile file = null;            try {                if(ftpClient.changeWorkingDirectory(remoteDir))                    CCFLogger.logger.info("进入FTP目录:" + remoteDir);                else {                    CCFLogger.logger.info("进入FTP目录:" + remoteDir + "失败");                    return false;                }                FTPFile[] remoteFiles = ftpClient.listFiles();                // 遍历所有文件，找到指定的文件                for (int i = 0; i < remoteFiles.length; i++) {                    if (remoteFiles[i].getName().equals(remoteFileName)) {                        file = remoteFiles[i];                        CCFLogger.logger.info("从FTP上找到了文件:" + remoteFileName);                        break;                    }                }            } catch (Exception e1) {                e1.printStackTrace();            }            if(file == null) {                CCFLogger.logger.info("没有从FTP上找到文件:" + remoteFileName);                return false;            }            File outFile = new File(localFile);            bis  = new BufferedInputStream(ftpClient.retrieveFileStream(file.getName()));            bos = new BufferedOutputStream(new FileOutputStream(outFile));            byte[] szBuf = new byte[128 * 1024];            int dwRead = 0;            while (( dwRead = bis.read(szBuf, 0, 128 * 1024)) != -1) {                try {                    bos.write(szBuf, 0,dwRead);                    bos.flush();                } catch (Exception e) {                }            }            if (ftpClient.isConnected()) {                CCFLogger.logger.info("断开FTP连接！");                try {                    ftpClient.disconnect();                } catch (IOException ioe) {}            }            try {                if (bis != null) bis.close();                if (bos != null) bos.close();            } catch (IOException e) {}            return true;        }         catch (Exception e) {            CCFLogger.logger.error("从FTP下载文件到服务器失败！", e);            return false;        }        finally {            try {                if (bis != null) bis.close();                if (bos != null) bos.close();            } catch (IOException e) {}        }    }}//该片段来自于http://byrx.net