java中如何实现ftp的功能? 不是一两句话能说完啊。你要会其它语言的,用java也就一样了。无非是建立Socket对象,BufferedReader,InputStream,OutputStream,写入ftp命令吧。 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 主要问题是,服务器端只是开了ftp服务,我用socket连接它可以吗?端口直接用21吗?那如何下载服务器上的文件呢 就是用网络编程中传统的Socket与ServerSocket类的操作啊 这样行不行?<<public class FTP { public static void main(String[] args) { System.out.println("ftp"); }}>> xiaohaiz(城里的老土,两眼依然通红!) 这样行不行?<<public class FTP { public static void main(String[] args) { System.out.println("ftp"); }}>>---------幽默,呵呵. package ftp;import sun.net.ftp.*;import sun.net.*;import java.awt.*;import java.awt.event.*;import java.applet.*;import java.io.*;public class FtpApplet extends Applet{FtpClient aftp;DataOutputStream outputs ;TelnetInputStream ins;TelnetOutputStream outs;TextArea lsArea;Label LblPrompt;Button BtnConn;Button BtnClose;TextField TxtUID;TextField TxtPWD;TextField TxtHost;int ch;public String a="没有连接主机"; String hostname="";public void init () {setBackground(Color.white);setLayout(new GridBagLayout());GridBagConstraints GBC = new GridBagConstraints();LblPrompt = new Label("没有连接主机");LblPrompt.setAlignment(Label.LEFT);BtnConn = new Button("连接");BtnClose = new Button("断开");BtnClose.enable(false);TxtUID = new TextField("",15);TxtPWD = new TextField("",15);TxtPWD.setEchoCharacter('*');TxtHost = new TextField("",20);Label LblUID = new Label("User ID:");Label LblPWD = new Label("PWD:");Label LblHost = new Label("Host:");lsArea = new TextArea(30,80);lsArea.setEditable(false);GBC.gridwidth= GridBagConstraints.REMAINDER;GBC.fill = GridBagConstraints.HORIZONTAL;((GridBagLayout)getLayout()).setConstraints(LblPrompt,GBC);add(LblPrompt);GBC.gridwidth=1;((GridBagLayout)getLayout()).setConstraints(LblHost,GBC);add(LblHost);GBC.gridwidth=GridBagConstraints.REMAINDER;((GridBagLayout)getLayout()).setConstraints(TxtHost,GBC);add(TxtHost);GBC.gridwidth=1;((GridBagLayout)getLayout()).setConstraints(LblUID,GBC);add(LblUID);GBC.gridwidth=1;((GridBagLayout)getLayout()).setConstraints(TxtUID,GBC);add(TxtUID);GBC.gridwidth=1;((GridBagLayout)getLayout()).setConstraints(LblPWD,GBC);add(LblPWD);GBC.gridwidth=1;((GridBagLayout)getLayout()).setConstraints(TxtPWD,GBC);add(TxtPWD);GBC.gridwidth=1;GBC.weightx=2;((GridBagLayout)getLayout()).setConstraints(BtnConn,GBC);add(BtnConn);GBC.gridwidth=GridBagConstraints.REMAINDER;((GridBagLayout)getLayout()).setConstraints(BtnClose,GBC);add(BtnClose);GBC.gridwidth=GridBagConstraints.REMAINDER;GBC.fill = GridBagConstraints.HORIZONTAL;((GridBagLayout)getLayout()).setConstraints(lsArea,GBC);add(lsArea); }public boolean connect(String hostname, String uid,String pwd){ this.hostname = hostname;LblPrompt.setText("正在连接,请等待.....");try{ aftp =new FtpClient(hostname); aftp.login(uid,pwd); aftp.binary(); showFileContents();}catch(FtpLoginException e){a="无权限与主机:"+hostname+"连接!";LblPrompt.setText(a) //继续!!return false;}catch (IOException e){a="连接主机:"+hostname+"失败!";LblPrompt.setText(a);return false;}catch(SecurityException e){a="无权限与主机:"+hostname+"连接!";LblPrompt.setText(a);return false;}LblPrompt.setText("连接主机:"+hostname+"成功!");return true;}public void stop(){try{aftp.closeServer();}catch(IOException e){}}public void paint(Graphics g){}public boolean action(Event evt,Object obj){if (evt.target == BtnConn){LblPrompt.setText("正在连接,请等待.....");if (connect(TxtHost.getText(),TxtUID.getText(),TxtPWD.getText())){BtnConn.setEnabled(false);BtnClose.setEnabled(true);}return true;}if (evt.target == BtnClose){stop();BtnConn.enable(true);BtnClose.enable(false);LblPrompt.setText("与主机"+hostname+"连接已断开!");return true;}return super.action(evt,obj);}public boolean sendFile(String filepathname){boolean result=true;if (aftp != null){LblPrompt.setText("正在粘贴文件,请耐心等待....");String contentperline;try{a="粘贴成功!";String fg =new String("\\");int index = filepathname.lastIndexOf(fg);String filename = filepathname.substring(index+1);File localFile ;localFile = new File(filepathname) ;RandomAccessFile sendFile = new RandomAccessFile(filepathname,"r");//sendFile.seek(0);outs = aftp.put(filename);outputs = new DataOutputStream(outs);while (sendFile.getFilePointer() !=sendFile.length()){ ch = sendFile.read(); outputs.write(ch);}outs.close();sendFile.close();}catch(IOException e){ a = "粘贴失败!"; result = false ;}LblPrompt.setText(a);showFileContents();}else{result = false;}return result;}public void showFileContents(){StringBuffer buf = new StringBuffer();lsArea.setText("");try{ins= aftp.list();while ((ch=ins.read())!=0){ buf.append((char)ch);} lsArea.appendText(buf.toString());ins.close(); }catch(IOException e){}} public static void main(String args[]){ Frame f = new Frame("FTP Client"); f.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } }); FtpApplet ftp = new FtpApplet(); ftp.init(); ftp.start(); f.add(ftp); f.pack(); f.setVisible(true); }} 新鲜出炉的用JAVA写的小游戏..点点世界V1.0发布! 请问如何把两个字节数组合并成一个字节数组? 初学JAVA的一点感觉 JTable如何使用?有没有最简单的例子。 请问怎样去掉数组中相同的值? 求助-关于Applet使用JNI THINK IN JAVA 第8章 中的一句话,不明白。请赐教! SMTP身分验证 java 新手上路的问题! 菜鸟求救,一个简单的问题。 在inner class中如何引用创建他的对象? 大家的看書方法是什麼,我在看<core java>,看得很困難!
端口直接用21吗?
那如何下载服务器上的文件呢
<<
public class FTP {
public static void main(String[] args) {
System.out.println("ftp");
}
}
>>
这样行不行?
<<
public class FTP {
public static void main(String[] args) {
System.out.println("ftp");
}
}
>>
---------
幽默,呵呵.
import sun.net.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;public class FtpApplet extends Applet
{
FtpClient aftp;
DataOutputStream outputs ;
TelnetInputStream ins;
TelnetOutputStream outs;
TextArea lsArea;
Label LblPrompt;
Button BtnConn;
Button BtnClose;
TextField TxtUID;
TextField TxtPWD;
TextField TxtHost;
int ch;
public String a="没有连接主机";
String hostname="";
public void init () {
setBackground(Color.white);
setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
LblPrompt = new Label("没有连接主机");
LblPrompt.setAlignment(Label.LEFT);BtnConn = new Button("连接");
BtnClose = new Button("断开");
BtnClose.enable(false);
TxtUID = new TextField("",15);
TxtPWD = new TextField("",15);
TxtPWD.setEchoCharacter('*');
TxtHost = new TextField("",20);
Label LblUID = new Label("User ID:");
Label LblPWD = new Label("PWD:");
Label LblHost = new Label("Host:");lsArea = new TextArea(30,80);
lsArea.setEditable(false);GBC.gridwidth= GridBagConstraints.REMAINDER;
GBC.fill = GridBagConstraints.HORIZONTAL;
((GridBagLayout)getLayout()).setConstraints(LblPrompt,GBC);
add(LblPrompt);GBC.gridwidth=1;
((GridBagLayout)getLayout()).setConstraints(LblHost,GBC);
add(LblHost);
GBC.gridwidth=GridBagConstraints.REMAINDER;
((GridBagLayout)getLayout()).setConstraints(TxtHost,GBC);
add(TxtHost);GBC.gridwidth=1;
((GridBagLayout)getLayout()).setConstraints(LblUID,GBC);
add(LblUID);
GBC.gridwidth=1;
((GridBagLayout)getLayout()).setConstraints(TxtUID,GBC);
add(TxtUID);GBC.gridwidth=1;
((GridBagLayout)getLayout()).setConstraints(LblPWD,GBC);
add(LblPWD);
GBC.gridwidth=1;
((GridBagLayout)getLayout()).setConstraints(TxtPWD,GBC);
add(TxtPWD);GBC.gridwidth=1;
GBC.weightx=2;
((GridBagLayout)getLayout()).setConstraints(BtnConn,GBC);
add(BtnConn);
GBC.gridwidth=GridBagConstraints.REMAINDER;((GridBagLayout)getLayout()).setConstraints(BtnClose,GBC);
add(BtnClose);GBC.gridwidth=GridBagConstraints.REMAINDER;
GBC.fill = GridBagConstraints.HORIZONTAL;
((GridBagLayout)getLayout()).setConstraints(lsArea,GBC);
add(lsArea);
}public boolean connect(String hostname, String uid,String pwd)
{
this.hostname = hostname;
LblPrompt.setText("正在连接,请等待.....");
try{
aftp =new FtpClient(hostname);
aftp.login(uid,pwd);
aftp.binary();
showFileContents();
}
catch(FtpLoginException e){
a="无权限与主机:"+hostname+"连接!";
LblPrompt.setText(a)
return false;
}
catch (IOException e){
a="连接主机:"+hostname+"失败!";
LblPrompt.setText(a);
return false;
}
catch(SecurityException e)
{
a="无权限与主机:"+hostname+"连接!";
LblPrompt.setText(a);
return false;
}
LblPrompt.setText("连接主机:"+hostname+"成功!");
return true;
}public void stop()
{
try
{
aftp.closeServer();
}
catch(IOException e)
{
}
}public void paint(Graphics g){
}public boolean action(Event evt,Object obj)
{
if (evt.target == BtnConn)
{
LblPrompt.setText("正在连接,请等待.....");
if (connect(TxtHost.getText(),TxtUID.getText(),TxtPWD.getText()))
{
BtnConn.setEnabled(false);
BtnClose.setEnabled(true);
}
return true;
}
if (evt.target == BtnClose)
{
stop();
BtnConn.enable(true);
BtnClose.enable(false);
LblPrompt.setText("与主机"+hostname+"连接已断开!");
return true;
}
return super.action(evt,obj);
}
public boolean sendFile(String filepathname){
boolean result=true;
if (aftp != null)
{
LblPrompt.setText("正在粘贴文件,请耐心等待....");String contentperline;
try{
a="粘贴成功!";
String fg =new String("\\");
int index = filepathname.lastIndexOf(fg);
String filename = filepathname.substring(index+1);
File localFile ;
localFile = new File(filepathname) ;
RandomAccessFile sendFile = new RandomAccessFile(filepathname,"r");
//
sendFile.seek(0);
outs = aftp.put(filename);
outputs = new DataOutputStream(outs);
while (sendFile.getFilePointer() !=sendFile.length())
{
ch = sendFile.read();
outputs.write(ch);
}
outs.close();
sendFile.close();
}
catch(IOException e){
a = "粘贴失败!";
result = false ;}
LblPrompt.setText(a);
showFileContents();
}
else{
result = false;
}
return result;
}public void showFileContents()
{
StringBuffer buf = new StringBuffer();
lsArea.setText("");
try
{
ins= aftp.list();
while ((ch=ins.read())!=0){
buf.append((char)ch);
}
lsArea.appendText(buf.toString());
ins.close();
}
catch(IOException e)
{
}
}
public static void main(String args[]){
Frame f = new Frame("FTP Client");
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
} });
FtpApplet ftp = new FtpApplet();
ftp.init();
ftp.start();
f.add(ftp);
f.pack();
f.setVisible(true);
}
}