我们一起学网络程序设计之三~~~~~~~~~~~~~~~~~~双向通信

我们一起学网络程序设计之三~~~~~~~~~~~~~~~~~~双向通信

Server3.java
import java.net.*;
import java.io.*;
public class Server3{
  private DataInputStream reader;
  private DataOutputStream writer;
  private ServerSocket server;
  private Socket socket;
  public Server3(){}
  void startServer(){
    try{
      server=new ServerSocket(7777);
      System.out.println("服务器套接字被成功创建");
      while(true){
        System.out.println("等待客户机连击请求");
        socket=server.accept();
        System.out.println("连接客户机完毕");
        reader=new DataInputStream(socket.getInputStream());
        writer=new DataOutputStream(socket.getOutputStream());
        getCommand();
      }
    }catch(Exception e){
      System.out.println(e); 
    }
  }
  void getCommand(){
    try{
      while(true){
        String fileName=reader.readUTF();
        writer.writeUTF(getFileInfo(fileName));
        writer.flush();
        System.out.println(fileName +"的信息传完毕");
      }
    }catch(Exception e){
    }finally{ 
      System.out.println("与客户机的连接中断");
      try{
        if(reader!=null) reader.close();
        if(writer!=null) writer.close();
        if(socket!=null) socket.close();
        reader=null; writer=null; socket=null;
      }catch(IOException ie){}
    }
  }
  String getFileInfo(String fileName){
    String fileInfo="";
    try{
      FileReader fr=new FileReader(fileName);
      BufferedReader br=new BufferedReader(fr);
      String temp;
      while((temp=br.readLine())!=null)
        fileInfo+= temp+"\n";
      br.close();
    }catch(FileNotFoundException fe){
      fileInfo="文件不存在"; 
    }catch(IOException ie){} 
    return fileInfo;
  }
  public static void main(String[] args){
    Server3 server=new Server3();
    server.startServer();
  }
}

Client3.java
import java.awt.*;
import java.net.*;
import java.io.*;
import java.awt.event.*;
public class Client3 extends Frame{
  private TextArea msgView=new TextArea();
  private TextField sendBox=new TextField();
  private DataInputStream reader;
  private DataOutputStream writer;
  Socket socket;
  public Client3(String title){
    super(title);
    msgView.setEditable(false);
    add(msgView,"Center");
    add(sendBox,"South");
    sendBox.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        try{
          writer.writeUTF(sendBox.getText());
          writer.flush();
          String fileInfo=reader.readUTF();
          msgView.setText("< " + sendBox.getText()+"的内容 >\n\n");
          msgView.append(fileInfo);
          sendBox.setText("");
        }catch(Exception ie){}
      }
    });
    pack();
  }
  private void connect(){
    try{
      msgView.append("尝试与服务器连接\n");
      socket=new Socket("127.0.0.1", 7777);
      msgView.append("连接完毕丰... 请输入文件名\n");
      reader=new DataInputStream(socket.getInputStream());
      writer=new DataOutputStream(socket.getOutputStream());
    }catch(Exception e){
      msgView.append("连接失败..");
    }
  }
  public static void main(String[] args){
    Client3 client=new Client3("查看服务器系统文件");
    client.setVisible(true);
    client.connect();
  }
}