RComponent 網絡組件 .java版
提供對FTP, NTP, POP3, SMTP編程組件
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http://www.rcomponet.com

Full support for all standard and many optional FTP operations, passive and active modes, and support for a very wide range of FTP servers. cd , madir ,rename, update, download delete operations on directories, including wildcarding.
NTP Client
Get NTP server datetime.
POP3 Client
List all e-mails on that server and delete the e-mails of your choice of the server,Display the mail data
SMTP Client
SMTP client connects to a mail server to send messages. It can relay message delivery to a defined server or directly deliver messages to a recipient's server for urgent message delivery. It supports connection timeouts.

FTPdemo.java
/**
?* Supports client-side access. RComponent net component suite demo. version 1.1
?* www.rcomponent.com
?*/
package demo.ftp;

import com.rcomponent.net.ftp.FtpClient;
import com.rcomponent.util.RLicenseManager;

public class FTPdemo {
??? public static void main(String[] args) {
??????? RLicenseManager.Registers("RComponentnet", "9assdddfkdccbfabksaeasefkssfrabe");
??????? FtpClient ftpClient = new FtpClient();
??????? ftpClient.setHostName("??????? ftpClient.setPort(21);
??????? ftpClient.setUserName("");
??????? ftpClient.setPassword("");
??????? System.out.println("Connect status: " + ftpClient.connect());
??????? System.out.println("Remote file list: " + ftpClient.getFileList());
??? }
}

NTPDemo.java
/**
?* Supports client-side access. RComponent net component suite demo. version 1.1
?* www.rcomponent.com
?*/
package demo.ntp;

import java.net.InetAddress;
import com.rcomponent.net.ntp.NtpClient;
import com.rcomponent.net.ntp.NtpPacket;
import com.rcomponent.net.ntp.NtpTimeInfo;
import com.rcomponent.net.ntp.NtpTimeStamp;
import com.rcomponent.util.RLicenseManager;

public? class NTPDemo {

??? public static? void main(String[] args) {
??????? RLicenseManager.Registers("RComponentnet", "9assdddfkdccbfabksaeasefkssfrabe");
??????? //1 clock.psu.edu
??????? //2 "clock.nc.fukuoka-u.ac.jp";
??????? //3 "ntp.alaska.edu";
??????? NtpTimeInfo info = null;
??????? try {
??????????? NtpClient client = new NtpClient();
??????????? String s = "clock.psu.edu";
??????????? InetAddress hostAddr = InetAddress.getByName(s);
??????????? System.out.println(" " + hostAddr.getHostName() + "/" + hostAddr.getHostAddress());
??????????? info = client.getTime(hostAddr);
??????????? // processResponse(info);
??????? } catch (Exception e) {
??????????? e.printStackTrace();
??????? }
??????? NtpPacket message = info.getMessage();
??????? NtpTimeStamp xmitNtpTime = message.getTransmitTimeStamp();
??????? System.out.println(" Transmit Timestamp:\t" + xmitNtpTime + "? " + xmitNtpTime.toDateString());
??????? info.computeDetails(); // compute offset/delay if not already done
??????? Long offsetValue = info.getOffset();
??????? Long delayValue = info.getDelay();
??????? String delay = (delayValue == null) ? "N/A" : delayValue.toString();
??????? String offset = (offsetValue == null) ? "N/A" : offsetValue.toString();
??????? //offset in ms
??????? System.out.println(" Roundtrip delay(ms)=" + delay + ", clock offset(ms)=" + offset);
??? }
}

POP3Demo.java
/**
?* Supports client-side access. RComponent net component suite demo. version 1.1
?* www.rcomponent.com
?*/
package demo.pop3;

import java.util.Vector;
import com.rcomponent.net.pop3.POP3Client;
import com.rcomponent.net.pop3.POP3MessageHeader;
import com.rcomponent.util.RLicenseManager;

public class POP3Demo {
??? public static void main(String[] args) {
??????? RLicenseManager.Registers("RComponentnet", "9assdddfkdccbfabksaeasefkssfrabe");
??????? String host = "", user = "", password = "";
??????? int port = 21;
??????? POP3Client pop3Client = new POP3Client();
??????? pop3Client.setHostName(host);
??????? pop3Client.setPort(port);
??????? pop3Client.setUserName(user);
??????? pop3Client.setPassword(password);
??????? pop3Client.Connect();
??????? System.out.println(pop3Client.getStatus());
??????? int noOfMessages = pop3Client.getNoOfMessage();
??????? try {
??????????? for (int i = 0; i < noOfMessages; i++) {
??????????????? POP3MessageHeader pop3MessageHeader = pop3Client.getMailHeader(i + 1);
??????????????? if (pop3MessageHeader != null) {
??????????????????? Vector rowData = new Vector();
??????????????????? rowData.addElement("" + (i + 1));
??????????????????? rowData.addElement(pop3MessageHeader.getFrom());
??????????????????? rowData.addElement(pop3MessageHeader.getSubject());
??????????????????? rowData.addElement(pop3MessageHeader.getDate());
??????????????????? System.out.println(pop3MessageHeader.getDate());
??????????????? }
??????????? }
??????? } catch (Exception e) {
??????????? System.out.println("Exception occured from GetMailHeadersThread : " + e);
??????? } finally {
??????????? pop3Client.closeConnection();
??????? }
??? }
}

/**
?* Supports client-side access. RComponent net component suite demo. version 1.1
?* www.rcomponent.com
?*/
package demo.smtp;

import com.rcomponent.net.message.Mail;
import com.rcomponent.net.smtp.SMTPClient;
import com.rcomponent.util.RLicenseManager;

public class SMTPDemo {
??? public static void main(String[] args) {
??????? RLicenseManager.Registers("RComponentnet", "9assdddfkdccbfabksaeasefkssfrabe");
??????? Mail message = new Mail();
??????? String from = "", to = "", cc = "", bcc = "", subject = "", body = "", attach = "";
??????? message.setFrom(from);
??????? message.setTo(to);
??????? message.setCc(cc);
??????? message.setBcc(bcc);
??????? message.setSubject(subject);
??????? message.setAttachments(attach);
??????? message.setBody(body);
??????? String host = "", userName = "", password = "";
??????? int port = 21;
??????? boolean authentication = true;
??????? SMTPClient smtpClient = new SMTPClient();
??????? smtpClient.setHostName(host);
??????? smtpClient.setPort(port);
??????? smtpClient.setAuthentication(authentication);
??????? smtpClient.setUserName(userName);
??????? smtpClient.setPassword(password);
??????? smtpClient.setSaveSentMessages(true);
??????? boolean success = false;
??????? if (smtpClient.connect()) {
??????????? success = smtpClient.sendMail(message);
??????????? smtpClient.closeConnection();
??????? }
??????? System.out.println(smtpClient.getStatus());
??????? if (success) {
??????????? String msg = "Mail successfully sent!";
??????????? if (true) {
??????????????? System.out.println("\nMessage has been successfully saved.");
??????????? }
??????? } else {
??????????? System.out.println("Mail could not sent successfully.\nSee Status for more details.");
??????? }
??? }
}