apcahce的comonns中有一个net包。
里面有ftpclient处理一般的上传和下载很容易。
里面有ftpclient处理一般的上传和下载很容易。
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package jdeveloper.ftp;import java.applet.Applet;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.*;
import sun.net.TelnetInputStream;
import sun.net.TelnetOutputStream;
import sun.net.ftp.FtpClient;
import sun.net.ftp.FtpLoginException;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;
String hostname; public FtpApplet()
{
a = "没有连接主机";
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(0);
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 = 0;
GBC.fill = 2;
((GridBagLayout)getLayout()).setConstraints(LblPrompt, GBC);
add(LblPrompt);
GBC.gridwidth = 1;
((GridBagLayout)getLayout()).setConstraints(LblHost, GBC);
add(LblHost);
GBC.gridwidth = 0;
((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 = 2D;
((GridBagLayout)getLayout()).setConstraints(BtnConn, GBC);
add(BtnConn);
GBC.gridwidth = 0;
((GridBagLayout)getLayout()).setConstraints(BtnClose, GBC);
add(BtnClose);
GBC.gridwidth = 0;
GBC.fill = 2;
((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 = String.valueOf((new StringBuffer("无权限与主机:")).append(hostname).append("连接!"));
LblPrompt.setText(a);
boolean flag = false;
return flag;
}
catch(IOException e)
{
a = String.valueOf((new StringBuffer("连接主机:")).append(hostname).append("失败!"));
LblPrompt.setText(a);
boolean flag1 = false;
return flag1;
}
catch(SecurityException e)
{
a = String.valueOf((new StringBuffer("无权限与主机:")).append(hostname).append("连接!"));
LblPrompt.setText(a);
boolean flag2 = false;
return flag2;
}
LblPrompt.setText(String.valueOf((new StringBuffer("连接主机:")).append(hostname).append("成功!")));
return true;
} public void stop()
{
try
{
aftp.closeServer();
}
catch(IOException ioexception) { }
} public void paint(Graphics g1)
{
} 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(String.valueOf((new StringBuffer("与主机")).append(hostname).append("连接已断开!")));
return true;
} else
{
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....");
try
{
a = "粘贴成功!";
String fg = new String("\\");
int index = filepathname.lastIndexOf(fg);
String filename = filepathname.substring(index + 1);
File localFile = new File(filepathname);
RandomAccessFile sendFile = new RandomAccessFile(filepathname, "r");
sendFile.seek(0L);
outs = aftp.put(filename);
outputs = new DataOutputStream(outs);
for(; sendFile.getFilePointer() < sendFile.length(); outputs.write(ch))
ch = sendFile.read(); 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 ioexception) { }
} 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);
}
}