java 网络编程-多人登录面向对象

TCP:模拟登录 :多个客户端,先后等待

public class tcp {

public static void main(String[]args) throws IOException
{
System.out.println("服务器启动中...");

ServerSocket server=new ServerSocket(8888);
boolean flag=true;

while(flag) {
Socket client=server.accept(); //一个客户端建立连接
System.out.println("一个客户端建立了连接");
new Thread(new channel(client)).start();

}

}
static class channel implements Runnable{
private Socket client;
private DataInputStream dis; //输入流
DataOutputStream dos;   //输出流
public channel(Socket client)
{
this.client=client;
try {
dis=new DataInputStream(client.getInputStream());
dos=new DataOutputStream(client.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
release();
}
}

public void run()
{

String uname="";
String password="";
String data=receive();
String[] datas=data.split("&");

uname=datas[0];
password=datas[1];

if(uname.equals("杜雨龙")&&password.equals("你最帅"))
{
send("登陆成功");
}else
{
send("登录失败");
}

release();
}
//接收数据
private String receive()
{
String data="";
try {
data = dis.readUTF();
} catch (IOException e) {

e.printStackTrace();
}
return data;
}

//发送数据
private void send(String msg)
{
try {
dos.writeUTF(msg);
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}

}
//释放资源
private void release()
{
try {
if(null!=dis)
{
dis.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if(null!=dis)
{
dos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if(null!=client)
{
client.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}

}
}

客户端: 存储文件

public class tcp2 {

public static void main(String[]args) throws IOException
{
System.out.println("客户端启动中...");

Socket client=new Socket("localhost",8888);

//发送
new send(client).sendto(name+"&"+password);
new receive(client).receiveto();

client.close();

}
static class send{
private Socket client;
private DataOutputStream dos;
private BufferedReader br;
private String msg;
public send(Socket client)
{
this.client=client;
br=new BufferedReader(new InputStreamReader(System.in));
msg=init();
try {
dos =new DataOutputStream(client.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
public void sendto()
{
try {
dos.writeUTF(msg);
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
public String init()
{

try {
System.out.println("请输入用户名");
String name=br.readLine();
System.out.println("请输入密码");
String password=br.readLine();
return name+"&"+password;
} catch (IOException e) {

e.printStackTrace();
}
return null;
}
}

static class receive{
private DataInputStream dis;
private Socket client;
public receive(Socket client)
{
this.client=client;
DataInputStream dis=new DataInputStream(client.getInputStream());
}

public void receiveto()
{
String data;
try {
data = dis.readUTF();
System.out.println(data);
} catch (IOException e) {
e.printStackTrace();
}

}
}
}