由于TCP需要两个用户之间建立连接才可以发送消息所以如果像UDP那样直接开启两个线程一个发送一个接受的话,用户一就会因为发送端开启但是连接不到接收端而无法发送。 所以就要在发送端加一个条件,当socket连接上接收端都才能进行下面的操作。
TCP实现:
Client端: 此类实现客户端套接字(也可以就叫“套接字”)。套接字是两台机器间通信的端点。 1:创建客户端的套接字Socket 2:获取输出流 3:输出流写数据 4:关闭套接字
Server端 此类实现服务器套接字。服务器套接字等待请求通过网络传入。它基于该请求执行某些操作,然后可能向请求者返回结果。 1:创建服务器的套接字ServerSocket 2:监听客户端的套接字 3:获取输入流读取内容 4:关闭套接字
发送端:
代码语言:javascript复制package net.tcp;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Scanner;
public class Send implements Runnable {
private String address;
private int port;
private String send;
private Socket socket;
public Send(String address, int port) throws IOException {
this.address = address;
this.port = port;
socket = null;
}
@Override
public void run() {
try {
while (socket == null) {
socket = new Socket(address, port);
Thread.sleep(1000);
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
while (true) {
try {
DataOutputStream dataOutputStream = new DataOutputStream(socket.getOutputStream());
send = new Scanner(System.in).nextLine();
if (send != null) {
dataOutputStream.writeUTF(send);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
接收端:
代码语言:javascript复制package net.tcp;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class Server implements Runnable {
private int port;
private ServerSocket serverSocket;
private Socket socket;
private DataInputStream dataInputStream;
public Server(int port) throws IOException {
this.port = port;
serverSocket = new ServerSocket(port);
}
@Override
public void run() {
try {
socket = serverSocket.accept();
System.out.println("连接成功");
dataInputStream = new DataInputStream(socket.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
while (true) {
try {
String receiver = dataInputStream.readUTF();
System.out.println(receiver);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
用户一
代码语言:javascript复制package net.tcp;
import java.io.IOException;
public class Test_1 {
public static void main(String[] args) throws IOException {
Send send = new Send("127.0.0.1", 8888);
Server server = new Server(8989);
new Thread(server).start();
new Thread(send).start();
}
}
用户二
代码语言:javascript复制package net.tcp;
import java.io.IOException;
public class Test_2 {
public static void main(String[] args) throws IOException {
Send send = new Send("127.0.0.1", 8989);
Server server = new Server(8888);
new Thread(server).start();
new Thread(send).start();
}
}