java Socket编程

一、只接受服务器的消息的例子

服务器端：

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

public class Server {

public static void main(String[] args){

try {
ServerSocket ss = new ServerSocket(30000);
while(true){
Socket s = ss.accept();
System.out.println("IP为"+s.getInetAddress()+"连接此服务器");
PrintStream ps = new PrintStream(s.getOutputStream());
ps.println("客户端您好，我是来自服务器的消息");
ps.close();
s.close();
}

} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

客户端：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {

public static void main(String[] args){

try {
Socket socket = new Socket("127.0.0.1",30000);
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

String line = br.readLine();
System.out.println("来自服务器的数据："+line);
br.close();
socket.close();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

二、服务器也接受消息

服务器端：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

public class Server {

public static void main(String[] args){

try {
ServerSocket ss = new ServerSocket(30000);
while(true){
Socket s = ss.accept();
System.out.println("IP为"+s.getInetAddress()+"连接此服务器");

BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
System.out.println("来自客户端的消息："+ br.readLine());

PrintStream ps = new PrintStream(s.getOutputStream());
ps.println("客户端您好，我是来自服务器的消息");

ps.close();
br.close();
s.close();
}

} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

客户端：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {

public static void main(String[] args){

try {
Socket socket = new Socket("127.0.0.1",30000);

PrintStream ps = new PrintStream(socket.getOutputStream());
ps.println("您好，我是来自客户端的消息1");

//ps.println("您好，我是来自客户端的消息2");

BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

String line = br.readLine();
System.out.println("来自服务器的数据："+line);

br.close();
ps.close();
socket.close();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}