基于java的Socket 聊天通信演示代码.zip

package ChatClient; import java.net.*; import java.io.*; public class ChatClient{ private DatagramSocket s; private InetAddress hostAddress; private byte[] buf = new byte[1000]; private DatagramPacket dp = new DatagramPacket(buf,buf.length); //方法说明：构造器，这里实现接收用户输入和与服务器通讯 public ChatClient(){ try{ //使用构造器，创建使用本机任何可用端口的数据包Socket s = new DatagramSocket(); //获取本地IP hostAddress = InetAddress.getByName("localhost"); while(true){ String outMessage =""; //读取输入 BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); try{ outMessage = stdin.readLine(); }catch(IOException ie){ System.err.println("IO error!"); } //如果输入“bye”则表示退出程序 if(outMessage.equals("bye")) break; String outString = "Client say: "+ outMessage; byte[] buf = outString.getBytes(); //打包数据，发送数据 DatagramPacket out = new DatagramPacket(buf,buf.length,hostAddress,4000); s.send(out); //等待服务器返回 s.receive(dp); String rcvd = "rcvd from "+ dp.getAddress() + ", " + dp.getPort() + ": "+ new String(dp.getData(),0,dp.getLength()); System.out.println(rcvd); } }catch(UnknownHostException e){ System.out.println("Can;t open socket"); System.exit(1); }catch(SocketException e){ System.out.println("Can;t open socket"); e.printStackTrace(); System.exit(1); }catch(IOException e){ System.err.println("Communication error"); e.printStackTrace(); System.exit(1); }catch(Exception e){ System.err.println("Communication error"); e.printStackTrace(); System.exit(1); } System.out.println("ChatClient over"); } public static void main(String[] args){ new ChatClient(); } }