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//EchoServer1.java
import java.io.*;
import java.net.*;
public class EchoServer1
{ public static void main(String[] args )
{ try
{
ServerSocket s = new ServerSocket(8500);
Socket incoming = s.accept( );
BufferedReader in = new BufferedReader
(new InputStreamReader(incoming.getInputStream()));
PrintWriter out = new PrintWriter
(incoming.getOutputStream(), true /* autoFlush */);
out.println( "Hello! Enter BYE to exit." );
boolean done = false;
while (!done)
{ String line = in.readLine();
if (line == null) done = true;
else
{ out.println("Echo: " + line);
if (line.trim().equals("BYE"))
done = true;
}
}
incoming.close();
}
catch (Exception e)
{ System.out.println(e);
}
}
}
// EchoClient1.java
import java.io.*;
import java.net.*;
public class EchoClient1 {
public static void main(String args[]) {
try{
if (args.length != 1){
System.out.println("USAGE: java Client servername");
return;
}
String connectto= args[0];
Socket connection;
// connect to server
if(connectto.equals("localhost")){
connection=new Socket(InetAddress.getLocalHost(),8500);
}
else{
connection=new Socket(InetAddress.getByName(connectto),8500);
}
BufferedReader input=new BufferedReader(new InputStreamReader(connection.getInputStream()));
PrintWriter out = new PrintWriter(connection.getOutputStream(), true /* autoFlush */);
// read information from server
String info;
info = input.readLine();
System.out.println(info);
boolean done = false;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
String sInput;
while(!done){
sInput = in.readLine();
out.println(sInput);
if (sInput.equalsIgnoreCase("bye")) done = true;
info = input.readLine();
System.out.println(info);
}
connection.close();
}
catch(SecurityException e){
System.out.println("SecurityException when connecting Server!");
}
catch(IOException e){
System.out.println("IOException when connecting Server!");
}
}
}
运行
1 运行服务器
java EchoServer1
2 运行 客户端
java EchoClient1 server_hostname
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