1、线程,定时检查2、某台机子改变了文件,然后它通知另一台机子:“我的xx文件夹xx.txt改变了!”
另一台机子过去更新
另一台机子过去更新
解决方案 »
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请给个大概的模本。
我对socket一敲不同。
onefox大牛,可以告诉我吗?
import java.io.*;
import java.net.*;public class SockServerExam
{
int portnum = 5555;
public static void main(String args[])
{
new SockServerExam().work();
}
void work()
{
try
{
ServerSocket server_socket=new ServerSocket(portnum);
System.out.println("listen on "+portnum);
while(true)
{
Socket socket = server_socket.accept();
System.out.println("New connection accepted " +
socket.getInetAddress() +
":" + socket.getPort());
RequestHandler rh = new RequestHandler(socket);
Thread th = new Thread(rh);
th.start();
}
}
// catch(InterruptedException e)
// {
// e.printStackTrace();
// }
catch(IOException eio)
{
eio.printStackTrace();
}
}
}
class RequestHandler implements Runnable
{
Socket conn;
InputStream input;
OutputStream output;
BufferedReader br;
byte[] buf;
public RequestHandler(Socket s)
{
try
{
conn=s;
this.input = conn.getInputStream();
this.output = conn.getOutputStream();
buf = new byte[256];
}
catch(Exception e)
{
e.printStackTrace();
}
}
public void run()
{
int receive_count=0;
int readcount = 1;
try
{
while(readcount>0)
{
readcount=input.read(buf);
System.out.println("received num:"+readcount);
if(readcount>0)
receive_count+=readcount;
}
System.out.println("connection accepted " +
conn.getInetAddress() +
":" + conn.getPort()+ " received bytes:" + receive_count);
input.close();
output.close();
conn.close();
}
catch(Exception e)
{
e.printStackTrace();
} }
}
import java.nio.*;
import java.nio.channels.*;
import java.net.*;
import java.io.*;
import java.nio.channels.spi.*;
import java.nio.charset.*;
import java.lang.*;
public class Client
{
public SocketChannel client = null;
public InetSocketAddress isa = null;
public RecvThread rt = null; public Client()
{
}
public void makeConnection()
{
int result = 0;
try
{
client = SocketChannel.open();
isa = new InetSocketAddress("dell1",4900);
client.connect(isa);
client.configureBlocking(false);
receiveMessage();
}
catch(UnknownHostException e)
{
e.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}
while ((result = sendMessage()) != -1)
{
} try
{
client.close();
System.exit(0);
}
catch(IOException e)
{
e.printStackTrace();
}
}
public int sendMessage()
{
System.out.println("Inside SendMessage");
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
String msg = null;
ByteBuffer bytebuf = ByteBuffer.allocate(1024);
int nBytes = 0;
try
{
msg = in.readLine();
System.out.println("msg is "+msg);
bytebuf = ByteBuffer.wrap(msg.getBytes());
nBytes = client.write(bytebuf);
System.out.println("nBytes is "+nBytes);
if (msg.equals("quit") || msg.equals("shutdown")) {
System.out.println("time to stop the client");
interruptThread();
try
{
Thread.sleep(5000);
}
catch(Exception e)
{
e.printStackTrace();
}
client.close();
return -1;
}
}
catch(IOException e)
{
e.printStackTrace();
}
System.out.println("Wrote "+nBytes +" bytes to the server");
return nBytes;
} public void receiveMessage()
{
rt = new RecvThread("Receive THread",client);
rt.start(); } public void interruptThread()
{
rt.val = false;
} public static void main(String args[])
{
Client cl = new Client();
cl.makeConnection();
} public class RecvThread extends Thread
{
public SocketChannel sc = null;
public boolean val = true;
public RecvThread(String str,SocketChannel client)
{
super(str);
sc = client;
}
public void run() { System.out.println("Inside receivemsg");
int nBytes = 0;
ByteBuffer buf = ByteBuffer.allocate(2048);
try
{
while (val)
{
while ( (nBytes = nBytes = client.read(buf)) > 0){
buf.flip();
Charset charset = Charset.forName("us-ascii");
CharsetDecoder decoder = charset.newDecoder();
CharBuffer charBuffer = decoder.decode(buf);
String result = charBuffer.toString();
System.out.println(result);
buf.flip();
}
}
}
catch(IOException e)
{
e.printStackTrace();
}
}
}
}