java TCPSocket聊天小程序

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TestChatServer {

public static void main(String[] args) {
InputStream in = null;
OutputStream out = null;
DataInputStream dis = null;
DataOutputStream dos = null;
BufferedReader br = null;
Socket s = null;
try {
ServerSocket ss = new ServerSocket(8888);
boolean flog = true;
s = ss.accept();
in = s.getInputStream();
out = s.getOutputStream();
dis = new DataInputStream(in);
dos = new DataOutputStream(out);
String str = null;
br = new BufferedReader(new InputStreamReader(System.in));
while (flog) {
str = dis.readUTF();
if (str.equals("bye")) {
System.out.println("client say : bye bye");
flog = false;
} else {
System.out.println("client say :" + str);
}
str = br.readLine();
dos.writeUTF(str);
dos.flush();
System.out.println("server say :" + str);
}
br.close();
dis.close();
dos.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
}
}

}

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class TestChatClient {

public static void main(String[] args) {
InputStream in = null;
OutputStream out = null;
BufferedReader br = null;
try {
Socket s = new Socket("127.0.0.1", 8888);
in = s.getInputStream();
out = s.getOutputStream();
DataOutputStream dos = null;
DataInputStream dis = null;
boolean flog = true;
dos = new DataOutputStream(out);
br = new BufferedReader(new InputStreamReader(System.in));
String str = null;
dis = new DataInputStream(in);
while (flog) {
str = br.readLine();
System.out.println("client say :" + str);
dos.writeUTF(str);
dos.flush();
str = dis.readUTF();
if (str.equals("bye")) {
flog = false;
System.out.println("server say : bye bye");
} else {
System.out.println("server say :" + str);
}
}
br.close();
dis.close();
dos.close();
s.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

}