filesend.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;
        Label l1;
        public static final int SERVICE_PORT = 13;  
        public static final int SERVICE_PORT2 = 15;
        public static final int SERVICE_FILE = 17;
        Socket rec,nextClient,socket_file;	
        ServerSocket server,server_file;
        BufferedReader reader;
        PrintStream pout;
        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);
             b1.addActionListener(this);
             b2.addActionListener(this);
             //this.pack();
             this.show();
             try
		   {
                         server = new ServerSocket (SERVICE_PORT2);
                   }
		
		catch (Exception ioe)
		   {
			System.err.println("error :- " + ioe);
		   }

           }
        public void datadis(String hostname)
         {
                     for(;;)   //无限循环 接受数据并显示
                    {
                       try
                          { 
                            rec = new Socket (hostname, SERVICE_PORT);
			    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........... ");
		             }
                      }
            }


       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
	                     {    //发送文件数据
                                server_file= new ServerSocket (SERVICE_FILE);    
                                socket_file= server_file.accept();  
  
                                t1.append("文件发送开始"+(char)13+(char)10);
                                BufferedInputStream  fileInput = new BufferedInputStream(new FileInputStream ("04.rm"));
				BufferedOutputStream out = new BufferedOutputStream(socket_file.getOutputStream());
			        
                                
                                try
		                   {
			              int data = fileInput.read();
		                      while (data != -1)//read()方法到达流末尾返回-1。
			                 {
				             out.write(data);
			                     data = fileInput.read();
          			         }
			             fileInput.close();
		                   }
		                catch (IOException ioe)
		                   {
			             System.err.println ("I/O error - " + ioe);
		                   }
				
                                socket_file.close();
                               System.out.println("send ok");
	                    }
		
		catch (Exception ioe)
		       {
			System.err.println ("error :- " + ioe);
		        }
               }

      }  


        }
         




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