会话程序

编写会话程序：
1.服务端
package sterning;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import .*;
import java.util.concurrent.*;
public class MultiThreadServer {
private int port=8821;
private ServerSocketserverSocket;
private ExecutorServiceexecutorService;//线程池
private final int POOL_SIZE=10;//单个CPU线程池大小
public MultiThreadServer() throws IOException{
serverSocket=new ServerSocket(port);
//Runtime的availableProcessor()方法返回当前系统的CPU数目. executorService=Executors.newFixedThreadPool(Runtime.getRuntim
e().availableProcessors()*POOL_SIZE);
System.out.println("服务器启动");
}
public void service(){
while(true){
Socket socket=null;
try {
//接收客户连接,只要客户进行了连接,就会触发accept();从而建立连接
socket=serverSocket.accept();
executorService.execute(new Handler(socket));
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) throws IOException {
new MultiThreadServer().service();
}
}
class Handler implements Runnable{
private Socket socket;
public Handler(Socket socket){
this.socket=socket;
}
private PrintWritergetWriter(Socket socket) throws IOException{
OutputStreamsocketOut=socket.getOutputStream();
return new PrintWriter(socketOut,true);
}
private BufferedReadergetReader(Socket socket) throws IOException{
InputStreamsocketIn=socket.getInputStream();
return new BufferedReader(new InputStreamReader(socketIn));
}
public String echo(String msg){
return "echo:"+msg;
}
public void run(){
try {
System.out.println("New connection accepted "+socket.getInetAddress()+":"+socket.getPort()); BufferedReaderbr=getReader(socket);
PrintWriter pw=getWriter(socket);
String msg=null;
while((msg=br.readLine())!=null){
System.out.println(msg);
pw.println(echo(msg));
if(msg.equals("bye"))
break;
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(socket!=null)
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
2.客户端
package sterning;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import .Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MultiThreadClient {
public static void main(String[] args) {
intnumTasks = 10;
ExecutorService exec = Executors.newCachedThreadPool(); for (inti = 0; i<numTasks; i++) {
exec.execute(createTask(i));
}
}
// 定义一个简单的任务
private static Runnable createTask(final inttaskID) { return new Runnable() {
private Socket socket = null;
private int port=8821;
public void run() {
System.out.println("Task " + taskID + ":start");
try {
socket = new Socket("localhost", port); // 发送关闭命令
OutputStreamsocketOut = socket.getOutputStream(); socketOut.write("shutdown\r\n".getBytes());
// 接收服务器的反馈
BufferedReaderbr = new BufferedReader(
new
InputStreamReader(socket.getInputStream()));
String msg = null;
while ((msg = br.readLine()) != null) System.out.println(msg);
} catch (IOException e) { e.printStackTrace();
}
}
};
}
}。