客戶端：
多個客戶可以正常收發(fā)信息，因為可以同時發(fā)送和接受信息，不是發(fā)送完信息后等待
返回信息，所以要加入多線程

站在用戶的角度思考問題，與客戶深入溝通，找到息縣網(wǎng)站設(shè)計與息縣網(wǎng)站推廣的解決方案，憑借多年的經(jīng)驗，讓設(shè)計與互聯(lián)網(wǎng)技術(shù)結(jié)合，創(chuàng)造個性化、用戶體驗好的作品，建站類型包括：成都網(wǎng)站設(shè)計、成都做網(wǎng)站、企業(yè)官網(wǎng)、英文網(wǎng)站、手機端網(wǎng)站、網(wǎng)站推廣、申請域名、網(wǎng)頁空間、企業(yè)郵箱。業(yè)務(wù)覆蓋息縣地區(qū)。

 public class Client {

public static void main(String[]args) throws UnknownHostException, IOException
{
    System.out.println("客戶端啟動中...");

    Socket client =new Socket("localhost",9999);

    new Thread(new Send(client)).start();

    new Thread(new Receive(client)).start();

}
}

客戶端的發(fā)送端封裝了：
發(fā)送消息
從鍵盤讀取消息
run()
釋放資源

 public class Send implements Runnable{

private BufferedReader br;
private DataOutputStream dos;
private Socket client;
private boolean flag=true;

public Send(Socket client)
{
    this.client=client;
    br=new BufferedReader(new InputStreamReader(System.in));
    try {
        dos=new DataOutputStream(client.getOutputStream());
    } catch (IOException e) {

        this.release();
    }
}
public void run()
{
    while(flag)
    {
        System.out.println("請輸入消息:");
        String msg=getstr();
        send(msg);

    }
}
private void release()
{
    this.flag=false;
    utils.close(dos,client);
}
//從控制臺獲取消息
private String getstr()
{
    try {
        String msg=br.readLine();
        return msg;
    } catch (IOException e) {

        e.printStackTrace();
    }
    return null;
}
private void send(String msg)
{
    try {
        dos.writeUTF(msg);
        dos.flush();

    } catch (IOException e) {
    release();
    }
}
}

客戶端的接收端封裝了:
接收消息
run()
釋放資源

public class Receive implements Runnable {
private DataInputStream dis;
private Socket client;
private boolean flag=true;

public Receive(Socket client)
{
    this.client=client;
    try {
        dis=new DataInputStream(client.getInputStream());
    } catch (IOException e) {
        release();
    }
}

private String receive()
{
    String msg;
    try {
        msg = dis.readUTF();
        return msg;
    } catch (IOException e) {
        release();
    }
    return null;
}
public void run()
{
    while(flag)
    {
        String msg=receive();
        System.out.println(msg);
    }

}
private void release()
{
    this.flag=false;
    utils.close(dis,client);
}
}

作為釋放資源工具類

public class utils {

public static void close(Closeable... target )
{
    for(Closeable it:target)
    {
            try {
                if(null!=it)
                {
                it.close();
                }
            } catch (IOException e) {

                e.printStackTrace();
            }

    }       
}
}

在線聊天室
服務(wù)器：

 public class Chat {

public static void main(String[]args) throws IOException
{
    System.out.println("服務(wù)器啟動中...");

    ServerSocket server=new ServerSocket(9999);

    while(true)
    {
        Socket client =server.accept();
        System.out.println("一個客戶端建立了連接");
        new Thread(new channel(client)).start();

    }

}

static class channel implements Runnable{
    private DataInputStream dis;
    private DataOutputStream dos;
    private BufferedReader br;
    private Socket client;
    private boolean flag;

    public channel(Socket client)
    {
        this.client=client;
        try {
            dis=new DataInputStream(client.getInputStream());
            dos=new DataOutputStream(client.getOutputStream());
            flag=true;
        } catch (IOException e) {
            release();          }
    }
    //接收消息
    private String receive() 
    {
        try {
            String msg=dis.readUTF();
            return msg;
        } catch (IOException e) {
            release();
        }
        return null;

    }
    //發(fā)送給消息
    private void send(String msg)
    {
        try {
            dos.writeUTF(msg);
            dos.flush();
        } catch (IOException e) {
            release();
        }

    }
    private void release()
    {
        this.flag=false;
        utils.close(dis,dos,client); //寫一個工具類,使用Closeable...可變參數(shù)    
    }
    public void run()
    {
        while(flag)
        {
            String msg=receive();
            send(msg);
        }
        release();

    }

}
}