Java用UDP并且最少代码实现计算器功能

Client代码： 

package UDPchor;
 
import java.awt.EventQueue;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;



import javax.swing.JLabel;

import javax.swing.JTextField;
import javax.swing.JScrollPane;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.awt.event.ActionEvent;
import javax.swing.SwingConstants;
 
public class client extends JFrame {
 
	private JPanel contentPane;
	private JTextField txtPort;
	private JTextField txtIP;
	private JTextField txt1;
	private JTextField txt2;
	private JTextField txt3;
	String num1="";
	String num2="";
	String opt="";
	socketThd sthd;
	DatagramSocket dsSocket=null;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					client frame = new client();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
 
	/**
	 * Create the frame.
	 */
	public client() {
		setTitle("客户端");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setBounds(170, 159, 2, 2);
		contentPane.add(scrollPane);
		
		txtPort = new JTextField();
		txtPort.setText("8890");
		txtPort.setBounds(176, 24, 66, 23);
		contentPane.add(txtPort);
		txtPort.setColumns(10);
		
		JButton btnStart = new JButton("登录");
		
		btnStart.setBounds(270, 24, 66, 23);
		contentPane.add(btnStart);
		
		JButton btnClose = new JButton("退出");
		
		btnClose.setBounds(358, 24, 66, 23);
		contentPane.add(btnClose);
		
		JLabel lblNewLabel = new JLabel("登录信息");
		lblNewLabel.setBounds(10, 10, 54, 15);
		contentPane.add(lblNewLabel);
		
		JLabel label = new JLabel("端口");
		label.setBounds(143, 28, 29, 15);
		contentPane.add(label);
		
		txtIP = new JTextField();
		txtIP.setText("192.168.1.10");
		txtIP.setBounds(67, 25, 66, 21);
		contentPane.add(txtIP);
		txtIP.setColumns(10);
		
		JLabel lblIp = new JLabel("服务器IP");
		lblIp.setBounds(10, 28, 54, 15);
		contentPane.add(lblIp);
		
		JPanel panel = new JPanel();
		panel.setBounds(10, 10, 414, 47);
		contentPane.add(panel);
		
		JLabel label_1 = new JLabel("操作");
		label_1.setBounds(10, 82, 54, 15);
		contentPane.add(label_1);
		
		JLabel label_2 = new JLabel("操作数1");
		label_2.setBounds(43, 128, 54, 15);
		contentPane.add(label_2);
		
		JLabel label_3 = new JLabel("操作数2");
		label_3.setBounds(43, 163, 54, 15);
		contentPane.add(label_3);
		
		JLabel label_4 = new JLabel("操作数3");
		label_4.setBounds(43, 198, 54, 15);
		contentPane.add(label_4);
		
		txt1 = new JTextField();
		txt1.setBounds(107, 125, 135, 21);
		contentPane.add(txt1);
		txt1.setColumns(10);
		
		txt2 = new JTextField();
		txt2.setColumns(10);
		txt2.setBounds(107, 159, 135, 21);
		contentPane.add(txt2);
		
		txt3 = new JTextField();
		txt3.setColumns(10);
		txt3.setBounds(107, 195, 135, 21);
		contentPane.add(txt3);
		
		

	
		
		btnStart.addActionListener(new ActionListener() {
			
			public void actionPerformed(ActionEvent e) {
				//初始化
				try {
					dsSocket=new DatagramSocket();
					new socketThd().start();
				} catch (Exception e2) {
					// TODO: handle exception
				}
				
			}
		});
		
		
		JButton btnPlus = new JButton("加法(+)");
		btnPlus.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				
				//发送数据
				try {
					InetAddress ip=InetAddress.getByName(txtIP.getText().trim());
					int port=Integer.parseInt(txtPort.getText().trim());
					num1=txt1.getText().trim();
					num2=txt2.getText().trim();
					double c=Double.parseDouble(num1)+Double.parseDouble(num2);
					String strSend=""+c;
					System.out.println("发送的："+strSend);
					byte [] bsSend=strSend.getBytes("UTF-8");
					DatagramPacket dpSend=new DatagramPacket(bsSend,bsSend.length,ip,port);
					dsSocket.send(dpSend);
				} catch (Exception e2) {
					// TODO: handle exception
				}
			}
		});
		btnPlus.setHorizontalAlignment(SwingConstants.LEFT);
		btnPlus.setBounds(252, 128, 81, 35);
		contentPane.add(btnPlus);
		
		JButton btnSub = new JButton("减法(-)");
		btnSub.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				//发送数据
				try {
					InetAddress ip=InetAddress.getByName(txtIP.getText().trim());
					int port=Integer.parseInt(txtPort.getText().trim());
					num1=txt1.getText().trim();
					num2=txt2.getText().trim();
					double c=Double.parseDouble(num1)-Double.parseDouble(num2);
					String strSend=""+c;
					System.out.println(strSend);
					byte [] bsSend=strSend.getBytes("UTF-8");
					DatagramPacket dpSend=new DatagramPacket(bsSend,bsSend.length,ip,port);
					dsSocket.send(dpSend);
				} catch (Exception e2) {
					// TODO: handle exception
				}
			}
		});
		btnSub.setHorizontalAlignment(SwingConstants.LEFT);
		btnSub.setBounds(343, 126, 82, 35);
	
		contentPane.add(btnSub);
		
		JButton btnMui = new JButton("乘法(*)");
		btnMui.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				//发送数据
				try {
					InetAddress ip=InetAddress.getByName(txtIP.getText().trim());
					int port=Integer.parseInt(txtPort.getText().trim());
					num1=txt1.getText().trim();
					num2=txt2.getText().trim();
					double c=Double.parseDouble(num1)*Double.parseDouble(num2);
					String strSend=""+c;
					System.out.println(strSend);
					byte [] bsSend=strSend.getBytes("UTF-8");
					DatagramPacket dpSend=new DatagramPacket(bsSend,bsSend.length,ip,port);
					dsSocket.send(dpSend);
				} catch (Exception e2) {
					// TODO: handle exception
				}
			}
		});
		btnMui.setHorizontalAlignment(SwingConstants.LEFT);
		btnMui.setBounds(252, 188, 78, 35);
		contentPane.add(btnMui);
		
		JButton btnDiv = new JButton("除法(/)");
		btnDiv.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				//发送数据
				try {
					InetAddress ip=InetAddress.getByName(txtIP.getText().trim());
					int port=Integer.parseInt(txtPort.getText().trim());
					num1=txt1.getText().trim();
					num2=txt2.getText().trim();
					double c=Double.parseDouble(num1)/Double.parseDouble(num2);
					String strSend=""+c;
					System.out.println(strSend);
					byte [] bsSend=strSend.getBytes("UTF-8");
					DatagramPacket dpSend=new DatagramPacket(bsSend,bsSend.length,ip,port);
					dsSocket.send(dpSend);
				} catch (Exception e2) {
					// TODO: handle exception
				}
			}
		});
		btnDiv.setHorizontalAlignment(SwingConstants.LEFT);
		btnDiv.setBounds(343, 188, 82, 35);
		contentPane.add(btnDiv);
		
		JPanel panel_1 = new JPanel();
		panel_1.setBounds(10, 67, 424, 184);
		contentPane.add(panel_1);
		
				
	}	
class socketThd extends Thread{
		
		//监听服务器反馈的信息
		
		public void run() {
			try {
				while(true) {
					
					byte [] bsRec=new byte[1024];
					DatagramPacket dpRec=new DatagramPacket(bsRec,bsRec.length);
					dsSocket.receive(dpRec);//阻塞命令
					String strRec=new String(bsRec,0,dpRec.getLength(),"UTF-8");
					System.out.println(strRec);
					txt3.setText(strRec);
					
				}
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
		//信息发送
		public void send(String num1,String num2,String opt) {
			
		}


	}
}

Service代码：

package UDPchor;
 
import java.awt.BorderLayout;
import java.awt.EventQueue;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
 
 
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import java.awt.event.ActionListener;

import java.math.BigDecimal;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

import java.awt.event.ActionEvent;

import javax.swing.border.TitledBorder;


 
public class service extends JFrame {
 
	private JPanel contentPane;
	private JTextField textPort;
	private JTextArea textArea;
	DatagramSocket dsRec=null;
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					service frame = new service();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
 
	/**
	 * Create the frame.
	 */
	public service() {
		setTitle("服务端");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 493, 360);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JLabel label = new JLabel("配置信息");
		label.setBounds(10, 10, 54, 15);
		contentPane.add(label);
		
		JLabel label_1 = new JLabel("端口");
		label_1.setBounds(10, 35, 36, 15);
		contentPane.add(label_1);
		
		textPort = new JTextField();
		textPort.setBounds(48, 35, 66, 21);
		textPort.setText("8890");
		contentPane.add(textPort);
		textPort.setColumns(10);
		
		JButton btnStart = new JButton("开始服务");
		btnStart.setBounds(147, 34, 93, 23);
		contentPane.add(btnStart);
		
		JButton btnClose = new JButton("停止服务");
		btnClose.setBounds(278, 31, 93, 23);
		contentPane.add(btnClose);
		
		JPanel panel = new JPanel();
		panel.setBounds(0, 10, 399, 63);
		contentPane.add(panel);
		
		JPanel panel_1 = new JPanel();
		panel_1.setBorder(new TitledBorder(null, "\u804A\u5929\u8BB0\u5F55", TitledBorder.LEADING, TitledBorder.TOP, null, null));
		panel_1.setBounds(10, 83, 457, 228);
		contentPane.add(panel_1);
		panel_1.setLayout(null);
		
		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		scrollPane.setBounds(10, 21, 437, 176);
		panel_1.add(scrollPane);
		
		textArea = new JTextArea();
		scrollPane.setViewportView(textArea);
		
		
		btnStart.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				//开启服务
				try {
					int port=Integer.parseInt(textPort.getText().trim());
					dsRec=new DatagramSocket(port);
					textArea.append("UDP服务开启...\r\n");
					new UDPthread().start();
				} catch (Exception e2) {
					// TODO: handle exception
				}
			}
		});
		
		btnClose.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				
			}
		});
	}
	class UDPthread extends Thread{
		@Override
		public void run() {
			try {
				while(true) {
					byte [] bsRec=new byte[1024];
					String rtn="";
					DatagramPacket dpRec=new DatagramPacket(bsRec,bsRec.length);
					dsRec.receive(dpRec);//阻塞式命令
					String strRec=new String(bsRec,0,dpRec.getLength(),"UTF-8");
					System.out.println("服务端接受的："+strRec);
					
					textArea.append("客户端："+strRec);
					System.out.println("客户端："+strRec);
					//处理
					
					String strRtn=strRec;
					System.out.println("RTN"+strRtn);
					byte []bsSend=strRtn.getBytes("UTF-8");
					DatagramPacket dpSend=new DatagramPacket(bsSend,bsSend.length,dpRec.getAddress(),dpRec.getPort());
					dsRec.send(dpSend);
				}
			} catch (Exception e) {
				// TODO: handle exception
			}
			
		}
	}
}

 

实现结果如下：