Ftp访问工具类

jtqxoqtbxa

　　java开发中经常会用到ftp上传、下载指定ftp服务器的文件，这里整理一个通过apache的commons-net包访问ftp服务的工具类：

package utils;
import java.io.IOException;
import java.net.SocketException;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.log4j.Logger;
/**
* @description
* @author minux
*/
public class FtpUtil {
public static final Logger logger = Logger.getLogger(FtpUtil.class);
private String hostIp;
private int port;
private String dir;
private String userName;
private String password;
private static final String DIR_SEPARATOR = "/";
private FTPClient ftpClient;
public FtpUtil() {
}
public FtpUtil(String hostIp, int port, String dir, String userName,
String password) {
this.hostIp = hostIp;
this.port = port;
this.dir = dir;
this.userName = userName;
this.password = password;
}
/**
* 连接FTP-------尝试3次
*
* @return
*/
public boolean getFtpConnection() {
int count = 0;
boolean isConnected = false;
while (count < 3 && !(isConnected = connectFtp())) {
count++;
logger.info("After a second connection again.");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return isConnected;
}
private boolean connectFtp() {
try {
ftpClient = new FTPClient();
ftpClient.setDataTimeout(30000);
ftpClient.setConnectTimeout(10000);
ftpClient.connect(hostIp, port);
if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
logger.warn("connect to server [" + hostIp + "] fail. ");
ftpClient.disconnect();
return false;
} else {
logger.info("connect to server [" + hostIp + "] success.");
return true;
}
} catch (SocketException e) {
logger.error("ftpHost [" + hostIp
+ "] is error, please give the correct ip: ", e);
return false;
} catch (IOException e) {
logger.error("ftpPort [" + hostIp
+ "] is error, please give the correct port: ", e);
return false;
}
}
/**
* 关闭FTP链接
*/
public void closeFtpConnection() {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException e) {
logger.error("close FTPClient error,", e);
}
}
}
}

　　
　　
　　
　　用到的第三方jar：
　　commons-net-3.3.jar
　　
　　目前该jar的新版本，老版本(1.4.1)会出现乱码的问题，并且不能设置一些常规参数，比如connectionTimeout(连接超时)