java 模拟客户端服务器上传下载功能

package com.cus.net.ptf; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.net.*; import java.io.*; import javax.swing.border.*; import java.util.*; public class ftpclient extends JFrame implements ActionListener { JTextField url_address,user_name,net_route,local_route,list_name,file_name,inlist_name; JPasswordField user_password; JButton url_connect,url_disconnect,loaddowm_Button,carry_Button,mkdir_Button,delete_Button,upward_Button,into_Button; JLabel condition_Label,route_Label;//condition_Label为状态显示栏，route_Label为当前在此站点的当前目录 JPanel message_Panel; JTable table;//用于显示返回目录下信息列表 Object data[][],name[]={"名称","类型","大小","创建时间"}; //以上为图形界面变量，以下为ftp连接参数 String s=null; Socket mysocket; DataInputStream in=null; DataOutputStream out=null; boolean linked=false; ftpclient() { super("FTP—Java应用程序"); //组件及布局设置 Container con=getContentPane(); Box box1,box2,box3,box4,box5,box6,box7,box; box1=Box.createHorizontalBox(); box1.add(Box.createHorizontalStrut(5)); box1.add(new JLabel("地址：")); url_address=new JTextField("127.0.0.1",50); box1.add(url_address); box2=Box.createHorizontalBox(); box2.add(Box.createHorizontalStrut(5)); box2.add(new JLabel("用户名：")); user_name=new JTextField("user",20); box2.add(user_name); box2.add(new JLabel("口令：")); user_password=new JPasswordField("123456",15); box2.add(user_password); url_connect=new JButton("连接"); url_disconnect=new JButton("断开"); box2.add(url_connect);box2.add(Box.createHorizontalStrut(10));box2.add(url_disconnect); box3=Box.createHorizontalBox(); box3.add(Box.createHorizontalStrut(5)); box3.add(new JLabel("网络目录：")); route_Label=new JLabel(); box3.add(route_Label); net_route=new JTextField(); box3.add(net_route); box4=Box.createHorizontalBox(); box4.add(Box.createHorizontalStrut(5)); local_route=new JTextField(); box4.add(new JLabel("本机目录：")); box4.add(local_route); box5=Box.createHorizontalBox(); loaddowm_Button=new JButton("下载");carry_Button=new JButton("上传"); box5.add(loaddowm_Button);box5.add(Box.createHorizontalStrut(100));box5.add(carry_Button); box6=Box.createHorizontalBox(); box6.add(Box.createHorizontalStrut(5)); mkdir_Button=new JButton("创建目录");delete_Button=new JButton("删除"); list_name=new JTextField(10);file_name=new JTextField(15); box6.add(new JLabel("新建目录名："));box6.add(list_name);box6.add(mkdir_Button); box6.add(Box.createHorizontalStrut(10)); box6.add(new JLabel("删除文件名："));box6.add(file_name);box6.add(delete_Button); box7=Box.createHorizontalBox(); box7.add(Box.createHorizontalStrut(5)); box7.add(new JLabel("进入目录：")); inlist_name=new JTextField(); box7.add(inlist_name); into_Button=new JButton("确定"); box7.add(into_Button); upward_Button=new JButton("返回上一级"); box7.add(upward_Button); box=Box.createVerticalBox(); box.add(Box.createVerticalStrut(10));box.add(box1);box.add(Box.createVerticalStrut(10));box.add(box2);box.add(Box.createVerticalStrut(10));box.add(box3);box.add(Box.createVerticalStrut(10));box.add(box4);box.add(Box.createVerticalStrut(10));box.add(box5);box.add(Box.createVerticalStrut(10));box.add(box6);box.add(Box.createVerticalStrut(10));box.add(box7); message_Panel=new JPanel(); message_Panel.setLayout(new BorderLayout()); message_Panel.setBackground(new Color(200,255,255)); message_Panel.add(new JLabel("当前目录下的所有信息"),BorderLayout.NORTH); data=new Object[500][4];//最多支持显示500条信息 table=new JTable(data,name); table.setEnabled(false); table.setRowHeight(20);table.setBackground(new Color(200,255,255)); message_Panel.add(new JScrollPane(table),BorderLayout.CENTER); con.add(message_Panel,BorderLayout.CENTER); JPanel panel1=new JPanel(); panel1.add(new JLabel("当前状态：")); condition_Label=new JLabel("未连接"); condition_Label.setForeground(Color.red); panel1.add(condition_Label); con.add(box,BorderLayout.NORTH); con.add(panel1,BorderLayout.SOUTH); validate(); setBounds(300,100,600,750); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置监听器 loaddowm_Button.addActionListener(this); carry_Button.addActionListener(this); mkdir_Button.addActionListener(this); delete_Button.addActionListener(this); upward_Button.addActionListener(this); into_Button.addActionListener(this); url_connect.addActionListener(this);url_disconnect.addActionListener(this); } public boolean showing() { try { int n=in.readInt(); if(n==0) { String mess=in.readUTF(); condition_Label.setText(mess); return false; } int i=0,j; for(;i<n;i++) { for(j=0;j<4;j++) { data[i][j]=in.readUTF(); } if(data[i][1].equals("文件"))data[i][2]=data[i][2]+" Byte"; data[i][3]=new Date(Long.parseLong(data[i][3].toString())).toString(); } for(;i<500;i++) { for(j=0;j<4;j++) { data[i][j]=""; } } } catch(IOException e1){condition_Label.setText("网络堵塞，请稍后重试!");} repaint(); return true; } public void actionPerformed(ActionEvent e)//各类事件定义 { if(e.getSource()==url_connect) //连接到指定服务器 { try { mysocket=new Socket(url_address.getText().trim(),4523); in=new DataInputStream(mysocket.getInputStream()); out=new DataOutputStream(mysocket.getOutputStream()); out.writeUTF(user_name.getText().trim()); out.writeUTF(new String(user_password.getPassword()).trim()); String zhuantai; zhuantai=in.readUTF(); condition_Label.setText(zhuantai); route_Label.setText(""); if(zhuantai.equals("欢迎用户user来到本站!")) { linked=true; try { out.writeUTF("dir");} catch(IOException e1){condition_Label.setText("网络堵塞，请稍后重试!");} out.writeUTF("."); showing(); } } catch(IOException e1) { condition_Label.setText("无法连接到服务器，请检查网络!"); } repaint(); } else if(e.getSource()==url_disconnect) //断开连接 { if(out!=null) { try { out.writeUTF("byebye"); } catch(IOException e1){condition_Label.setText("已断开连接!");} try { mysocket.close(); route_Label.setText(""); condition_Label.setText("已断开连接!"); } catch(IOException e1){} } } else if(e.getSource()==loaddowm_Button) //下载指定文件 { try { out.writeUTF("load"); String tem=route_Label.getText()+net_route.getText(); out.writeUTF(tem); } catch(IOException e1){condition_Label.setText("网络堵塞，请稍后重试!");} try { if(in.readUTF().equals("ok")) { File loadfile=new File(local_route.getText()); if(!loadfile.createNewFile()){condition_Label.setText("文件已存在");out.writeUTF("操作取消");} else { out.writeUTF("开始接收......"); 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