Socket里面参数必须为IP地址+端口号java.net.UnknownHostException

报错显示：

C:\Users\wenjrg\Desktop\2019.5.14>java ClickTest
Exception in thread "main" java.net.UnknownHostException: a
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at java.net.InetAddress.getByName(InetAddress.java:1076)
at ClickTest.main(ClickTest.java:11)

用Socket实现简单账号密码登录

1. 实现客户端

　　

 1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 import java.io.PrintWriter;
 5 import java.net.*;
 6 
 7 public class ClickTest {
 8     //模拟用户登录
 9     public static void main(String[] args) throws IOException {
10         //创建socket对象
11         Socket s=new Socket(InetAddress.getByName("127.0.0.1"),8888);
12         //Socket s=new Socket("itheima",8888);
13         //获取用户名和密码
14         BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
15         System.out.println("请输入用户名：");
16         String username=br.readLine();
17         System.out.println("请输入密码：");
18         String password=br.readLine();
19         //获取输出流对象(换行)
20         PrintWriter out=new PrintWriter(s.getOutputStream(),true);
21         //写出数据
22         out.println(username);
23         out.println(password);
24         //获取输入流对象
25         BufferedReader serverBr=new BufferedReader(new InputStreamReader(s.getInputStream()));
26         //获取服务器返回的数据
27         String result=serverBr.readLine();
28         System.out.println(result);
29         //释放
30         s.close();
31 
32     }
33 
34 }

 

2.服务端

 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 
 8 public class ServerTest {
 9 
10     public static void main(String[] args) throws IOException {
11         //创建服务器端socket对象
12         ServerSocket ss=new ServerSocket(8888);
13         //监听
14         Socket s=ss.accept();
15         //获取输入流对象
16         BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
17         //判断用户名和密码是否正确
18         String username=br.readLine();
19         String password=br.readLine();
20         //返回判断信息
21         boolean flag=false;
22         if("a".equals(username)&&"1234".equals(password)){
23                 flag=true;
24          }
25         PrintWriter out=new PrintWriter(s.getOutputStream(),true);
26                 
27         if(flag){
28             out.println("登陆成功");
29         }else{
30             out.println("登录失败");
31         }
32         //释放资源
33         s.close();
34         //ss.close() 服务器不关闭
35 
36     }
37 
38 }

 

posted @ 2019-05-14 21:56  Domefy  阅读(1557)  评论(0)    收藏  举报