filerecieve.java

本程序分客户端和服务端,首先进行连接,然后可以进行简单的信息发送和文件的传输功能

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;



 class win extends Frame implements ActionListener
  {
        TextArea t1;
        TextField t2;
        Button b1,b2;
        String host;
        Label l1;
        PrintStream pout;
        public static final int SERVICE_PORT = 13;  
        public static final int SERVICE_PORT2 =15;  
        public static final int SERVICE_FILE = 17;
        ServerSocket server;
        Socket nextClient,rec,rec_file;	
        BufferedReader reader;
        win(String s)
           {

//这段代码是显示界面
             super(s);
             setVisible(true);
             setSize(400,500);
             setLayout(new FlowLayout());
             l1=new Label("聊天记录");
             t1=new TextArea("",20,50);
             t2=new TextField("",50);
             b1=new Button("文件接收");
             b2=new Button("发送");
             add(l1);
             add(t1);
             add(b1);
             add(t2);
             add(b2);
             l1.setVisible(true);
             t1.setVisible(true);
             t2.setVisible(true);
             b1.setVisible(true);
             b2.setVisible(true);
             b2.addActionListener(this);
             b1.addActionListener(this);
             this.show();
                try
		   {
                         server = new ServerSocket (SERVICE_PORT);
                   }
		
		catch (Exception ioe)
		   {
			System.err.println ("error :- " + ioe);
		   }
           }

          public void datadis(String hostname)
              {
                     host=hostname;
                     for(;;)         //无限循环 接受数据并显示
                    {
                       try
                          { 
                            rec = new Socket (hostname, SERVICE_PORT2);
			    System.out.println  ("Connection established,the local port is:"+rec.getLocalAddress()+rec.getLocalPort());
			    reader = new BufferedReader (new InputStreamReader(rec.getInputStream()));     
                            t1.append(reader.readLine()+(char)13+(char)10);
		          }
		        catch (Exception ioe)
		             {
			           System.err.println (" wait server................... - " + ioe);
		             }
                      }
            }

       public void actionPerformed(ActionEvent e)
           { 
              if (e.getSource()==b2)
                {
                      try
		             { //发送数据
			
                                nextClient = server.accept();
				OutputStream out = nextClient.getOutputStream();
			        pout = new PrintStream (out);
                                pout.print( t2.getText());
				pout.flush();
                                nextClient.close();
                                
		               }
		
		        catch (Exception ioe)
		               {
			             System.err.println ("error :- " + ioe);
		               }
               

                }


                if (e.getSource()==b1)
                  {
                      try
		          {        //接受文件数据
                               rec_file = new Socket (host, SERVICE_FILE);
                               t1.append("文件接收开始"+(char)13+(char)10);

                               BufferedInputStream input= new BufferedInputStream (rec_file.getInputStream());     
                               BufferedOutputStream  output = new BufferedOutputStream(new FileOutputStream ( "04_test.rm"));
                               int data;
                                System.out.println("recieve..............");
                               while ((data=input.read())!=-1)
                                 {
                                       output.write(data);
                                                                   
                                  }      
                              System.out.println("recieve ok");
			       output.close();
		          }
		      catch (IOException ioe)
		          {
			      System.err.println ("I/O error - " + ioe);
		          }
                           
		   }
		
		
          }


    }





// Chapter 6, Listing 2
public class filerecieve
{
        
        public static void main(String args[])
	   {
                win  w1=new win("这是一个信息发送和接收的例子_server");
                String hostname = args[0];
                w1.datadis(hostname);
		
       	  }
  
}