1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 import java.io.PrintWriter;
 5 import java.net.Socket;
 6 
 7 public class ClientText {
 8 
 9     public static void main(String[] args) throws IOException {
10         //创建客户端socket对象
11         //Socket s = new Socket(InetAddress.getLocalHost(), 8888);
12         //127.0.0.1表示IP   8888表示端口号
13         Socket s = new Socket("127.0.0.1", 8888);
14         
15         //获取用户名和密码
16         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
17         System.out.println("请输入用户名:");
18         String username = br.readLine();
19         System.out.println("请输入密码:");
20         String password = br.readLine();
21         
22         //获取输出流对象
23         //BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
24         PrintWriter out = new PrintWriter(s.getOutputStream(), true); 
25         
26         //写出数据
27         out.println(username);
28         out.println(password);
29         
30         //获取输入流对象
31         BufferedReader bur = new BufferedReader(new InputStreamReader(s.getInputStream()));
32         
33         //获取返回的数据
34         String result = bur.readLine();
35         System.out.println(result);
36         
37         //释放资源
38         s.close();
39     }
40 }

 1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 import java.io.PrintWriter;
 5 import java.net.ServerSocket;
 6 import java.net.Socket;
 7 import java.util.List;
 8 
 9 public class ServerText {
10     
11     public static void main(String[] args) throws IOException {
12         //创建ServerSocket对象
13         ServerSocket ss = new ServerSocket(8888); 
14         
15         //监听
16         Socket s = ss.accept();
17         
18         //获取输入流对象
19         BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
20         
21         //获取用户名和密码
22         String username = br.readLine();
23         String password = br.readLine();
24         
25         //判断是否正确
26         boolean flag = false;
27         List<User> users = UserDB.getUers();
28         User user = new User(username, password);
29         if(users.contains(user)) {
30             flag = true;
31         }            
32         PrintWriter out = new PrintWriter(s.getOutputStream(), true);
33         
34         //返回判断结果
35         if (flag)
36             out.println("登录成功");
37         else 
38             out.println("登录失败");
39         
40         //释放资源
41         s.close();
42     }
43 }