Java基础-网络编程(TCP-客户端并发登录)

客户端通过键盘录入用户名

服务端对这个用户名进行校验

如果该用户存在，在服务端显示xxx，已登陆

并在客户端显示xxx，欢迎光临

如果该用户不存在，在服务端显示xxx，尝试登陆

并在客户端显示xxx，该用户不存在

最多就登陆三次import java.io.*;
import java.net.*;
class LoginClient
{
public static void main(String[] args) throws Exception
{
Socket s = new Socket("192.168.0.100",10008);

BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));

PrintWriter out = new PrintWriter(s.getOutputStream(),true);

BufferedReader bufIn = new BufferedReader(new InputStreamReader(s.getInputStream()));

for(int x=0;x<3;x++)
{
String line = bufr.readLine();
if(line==null)
break;
out.println(line);

String info = bufIn.readLine();
System.out.println("info:"+info);
if(info.contains("欢迎"))
break;
}

bufr.close();
s.close();
}
}

class UserThread implements Runnable
{
private Socket s;
UserThread(Socket s)
{
this.s = s;
}
public void run()
{
String ip = s.getInetAddress().getHostAddress();
System.out.println(ip+"....connected");
try
{
for(int x=0;x<3;x++)
{
BufferedReader bufIn = new BufferedReader(new InputStreamReader(s.getInputStream()));

String name = bufIn.readLine();
if(name==null)
break;

BufferedReader bufr = new BufferedReader(new FileReader("user.txt"));

PrintWriter out = new PrintWriter(s.getOutputStream(),true);

String line = null;

boolean flag = false;
while((line=bufr.readLine())!=null)
{
if(line.equals(name))
{
flag = true;
break;
}
}
if(flag)
{
System.out.println(name+",已登陆");
out.println(name+",欢迎光临");
break;
}
else
{
System.out.println(name+",尝试登陆");
out.println(name+",用户名不存在");

}
}
s.close();
}
catch(Exception e)
{
throw new RuntimeException(ip+"校验失败");
}
}
}

class LoginServer
{
public static void main(String[] args) throws Exception
{
ServerSocket ss = new ServerSocket(10008);

while(true)
{
Socket s = ss.accept();

new Thread(new UserThread(s)).start();
}
}
}