通过ServerSocket与Socket实现的TCP的通信,这个例子配合了swing使用,其实作者之前发过一篇ServerSocker与Socket的通信,在这里,这边文章就是在这个例子上修改而成的.
其实原理很简单的,就是一个服务端一个客户端,服务端这边创建好ServerSocket后,使用accept()堵塞一直等待客户端发送socket.
好吧,不废话了.进正题.
swing的部分就不说了,说一下主要操作.
ServerSocket serverSocket = null;
serverSocket = new ServerSocket(12345);//一个不被占用的端口即可
构造方法的参数是端口,默认使用本地ip.
ServerSocket有三个构造方法.
ServerSocket(int port);
ServerSocket(int port,int backlog);
ServerSocker(int poer,int backlog,InetAddress ip);
详情可以看这里
Socket socket = serverSocket.accept();
返回一个Socket(),会一直等待,处于阻塞状态.
一般设置一个while(true)循环接收.
使用DataInputStream与DataOutputStream:
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
DataOutputStram outputStream = new DataOutputStream(socket.getOutputStream());
然后使用read与write方法即可.
注意关闭的时候要等输入输出完成后再一起关闭,就是说,不能这样:
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
String data = inputStream.readUTF();
inputStream.close();
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
outputStream.writeUTF("ok");
outputStream.close();
这样的话getInputStream()没有问题,但是到了getOutputStream()的时候就有问题了,会提示异常:
Socket is closed.
所以解决办法就是等输出完之后再一起关闭:
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
String data = inputStream.readUTF();
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
outputStream.writeUTF("ok");
inputStream.close();//等输出完成后再关闭
outputStream.close();
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.*;
public class Server {
public static void main(String[] args)
{
JFrame frame = new JFrame("Server");
JPanel panel = new JPanel();
JTextArea text = new JTextArea();
panel.add(text);
frame.setContentPane(panel);
frame.setSize(600, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ServerSocket serverSocket = null;
try
{
serverSocket = new ServerSocket(12345);
while (true)
{
Socket socket = serverSocket.accept();
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
text.setText(inputStream.readUTF());
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
outputStream.writeUTF("ok");
inputStream.close();
outputStream.close();
socket.close();
}
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
try
{
serverSocket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
客户端的操作就是开启一个Socket,再通过这个socket获取对应的输入输出流就可以了.
Socket socket = new Socket("127.0.0.1",12345);//这个端口与服务端的端口对应
Socket有三个构造方法:
Socket(InetAddress ip,int port);
Socket(String ip,int port);
Socket(InetAddress ip,int port,InetAddress localIp,int localPort);
Socket(String ip,int port,InetAddress localIp,int localPort);
详情可以看这里
同样使用DataInputStream与DataOutputStream:
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import javax.swing.*;
import java.awt.GridLayout;
public class Client
{
public static void main(String[] args) {
JFrame frame = new JFrame();
JTextArea text = new JTextArea();
JButton send = new JButton();
GridLayout layout = new GridLayout(2, 1, 0, 5);
frame.setTitle("Client");
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setSize(600, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(layout);
frame.add(text);
frame.add(send);
send.setText("send");
send.addActionListener(v ->
{
try
{
String host = "127.0.0.1";
int port = 12345;
Socket socket = new Socket(host, port);
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
outputStream.writeUTF(text.getText());
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
text.setText(inputStream.readUTF());
outputStream.close();
inputStream.close();
socket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
});
}
}
先开启服务端,再开启客户端,这里设置了服务端返回给客户端的信息为"ok".
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