如何java判断ftp服务器上路径是否存在

如何java判断ftp服务器上路径是否存在

要注意的是程序有可能和FTP不再同一台服务器上，所以要多做一些工作，先要根据获取FTP的IP，根据这个IP的FTP目录 在进行判断
代码如下
=======接口部分===============
IMPORT JAVA.RMI.REMOTE;
IMPORT JAVA.RMI.REMOTEEXCEPTION;

PUBLIC INTERFACE IDOREMOTE EXTENDS REMOTE {
PUBLIC INT GETSERVERTIME() THROWS REMOTEEXCEPTION;
}

=======接口实现===============

PUBLIC CLASS DOREMOTEIMPL EXTENDS UNICASTREMOTEOBJECT IMPLEMENTS IDOREMOTE {


PROTECTED DOREMOTEIMPL() THROWS REMOTEEXCEPTION {
SUPER();
}

PRIVATE STATIC FINAL LONG SERIALVERSIONUID = -8158779541912069375L;


PUBLIC INT GETSERVERTIME() THROWS REMOTEEXCEPTION {
RETURN INTEGER.PARSEINT(NEW SIMPLEDATEFORMAT("YYYYMMDD").FORMAT(NEW DATE()));
// RETURN NEW DATE();
}

========SERVER端绑定===============
PUBLIC STATIC VOID MAIN(STRING[] ARGS) {
TRY {
LOCATEREGISTRY.CREATEREGISTRY(8808);
DOREMOTEIMPL SERVER = NEW DOREMOTEIMPL();
NAMING.REBIND("//LOCALHOST:8808/DATE-SERVER", SERVER);
} CATCH (JAVA.NET.MALFORMEDURLEXCEPTION ME) {
SYSTEM.OUT.PRINTLN("MALFORMED URL: " + ME.TOSTRING());
} CATCH (REMOTEEXCEPTION RE) {
SYSTEM.OUT.PRINTLN("REMOTE EXCEPTION: " + RE.TOSTRING());
}
}

===========客户端的调用方式============
STRING URL = "//LOCALHOST:8808/DATE-SERVER";
IDOREMOTE RMIOBJECT = (IDOREMOTE) NAMING.LOOKUP(URL);
SYSTEM.OUT.PRINTLN(" SERVER DATE: " + RMIOBJECT.GETSERVERTIME());