java经典代码(最全面)

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1、Java实现ftp功能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   Bt

2、nConn;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");L

3、blPrompt.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:"

4、);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()).

5、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(Tx

6、tUID,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.gridwi

7、dth=GridBagConstraints.REMAINDER;((GridBagLayout)getLayout()).setConstraints(BtnClose,GBC);add(BtnClose);GBC.gridwidth=GridBagConstraints.REMAINDER;GBC.fill     = GridBagConstraints.HORIZONTAL;((GridB