A calculator based on TCP communication, the client sends data to the server through the button, the server calculates and processes the data, and sends the calculation result back to the client. It uses multithreading to enable.
Server thread:
package com.netproject2;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
public class CalculatorServer extends Thread{
public final double PI=3.1415927; / / define pi
Socket client; / / define client socket
DataInputStream datain=null; / / define data input stream to receive data
InputStream in=null;
DataOutputStream dataout=null; / / define data output stream to transfer data
OutputStream out=null;
float num_one;
float num_two;
float result; / / define the calculation result
int symbol; / / define symbol
public CalculatorServer(Socket client){
this.client=client;
}
public void run() {
try {
in=client.getInputStream();//Input stream reception
datain=new DataInputStream(in);//Stream to data
out=client.getOutputStream();
dataout=new DataOutputStream(out);
while(true){
symbol=datain.readInt();//Read symbols replaced by numbers
switch(symbol){//Calculation
case 1:
num_two=datain.readFloat();//Read the number of the second input
result=(float) Math.sin(num_two*PI/180);
dataout.writeFloat(result);break;//Transfer calculation results to client
case 2:
num_two=datain.readFloat();//Read the number of the second input
result=(float) Math.cos(num_two*PI/180);
dataout.writeFloat(result);break;//Transfer calculation results to client
case 3:
num_two=datain.readFloat();//Read the number of the second input
result=(float) Math.tan(num_two*PI/180);
dataout.writeFloat(result);break;//Transfer calculation results to client
case 4:
num_two=datain.readFloat();//Read the number of the second input
result=(float) Math.sqrt(num_two*PI/180);
dataout.writeFloat(result);break;//Transfer calculation results to client
case 5:
num_one=datain.readFloat();//Read integer data
num_two=datain.readFloat();//Read the number of the second input
result=num_one+num_two;
dataout.writeFloat(result);break;//Transfer calculation results to client
case 6:
num_one=datain.readFloat();//Read integer data
num_two=datain.readFloat();//Read the number of the second input
result=num_one-num_two;
dataout.writeFloat(result);break;//Transfer calculation results to client
case 7:
num_one=datain.readFloat();//Read integer data
num_two=datain.readFloat();//Read the number of the second input
result=num_one*num_two;
dataout.writeFloat(result);break;//Transfer calculation results to client
case 8:
num_one=datain.readFloat();//Read integer data
num_two=datain.readFloat();//Read the number of the second input
result=num_one/num_two;
dataout.writeFloat(result);break;//Transfer calculation results to client
default:break;
}
}
}catch (IOException e) {
e.printStackTrace();
}
try {//Close sockets and streams
in.close();
datain.close();
out.close();
dataout.close();
client.close();
} catch (IOException e) {
System.out.println(client.isConnected());
e.printStackTrace();
}
}
}
Server master method:
package com.netproject2;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class DemoServer {
//The client can be reconnected after disconnection
public static void main(String[] args) {
ServerSocket server=null;
Socket client=null;
try {
server=new ServerSocket(8866); / / create server socket
System.out.println("server started, waiting for client connection..." );
}catch (IOException e) {
System.out.println("server socket creation error");
}
while(true){
try {
client=server.accept(); / / connect to the client
System.out.println("client connected, can communicate..." +client);
} catch (IOException e1){
System.out.println("client connection error");
}
if(client!=null) {/ / used to connect multiple clients at the same time
new CalculatorServer(client).start();
}
}
}
}
Client thread:
package com.netproject2;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class CalculatorClient extends JFrame implements Runnable,ActionListener{
Socket client=null;
DataInputStream datain=null;
InputStream in=null;
DataOutputStream dataout=null;
OutputStream out=null;
String[][] inputButtonNames={{"sin","cos","tan","√"},{"1","2","3","+"},{"4","5","6","-"},{"7","8","9","*"},{".","0","=","/"}};
//Define 2D array mount button name inputButtonNames
JTextField show=new JTextField();//Create input box textField
JButton[] inButton=new JButton[20];//Create input buttonbutton
String[] resetButtonNames={" clear empty "," clear except "};//Define clear button name resetButtonNames
JButton[] resetButton=new JButton[2];//Create a clear buttonresetbutton
String tempText="";//Button number (string) used to temporarily store the first acquisition
int symbol=0;//Used to judge operation symbols
float num_one;//Used to store the number before the input operation symbol (converted)
float num_two;//Used to store the number after the input operation symbol (converted)
float result;//Used to store operation results
int number=0;//Number of times to judge the input
boolean com=false;//Used to determine whether the operation symbol and decimal point are entered
public CalculatorClient(){//Parameterless constructor of the evaluation panel
super("Client");//Call parent method
this.setBounds(300,300,252, 264);//Set the size of the form and where it appears on the screen
JPanel ibp=new JPanel();//Create input box panel input box panel
show.setText("0");//Set input box initial number "0"
show.setColumns(21);//Set the number of input box columns
show.setEditable(false);//Set input box to non editable state
show.setHorizontalAlignment(SwingConstants.RIGHT);//Set the orientation of the input box: North
ibp.add(show);//Add an input box to the input box panel
this.add(ibp, BorderLayout.NORTH);//Set orientation of input box panel: set North
JPanel bp=new JPanel();//Set input button panel
GridLayout gridLayout=new GridLayout(5,4,4,4);//Grid layout
bp.setLayout(gridLayout);//Input button panel using grid layout
for(int i=0;i<5;i++){//Insert input buttons one by one with array and loop
for(int j=0;j<inputButtonNames[0].length;j++){
inButton[i*4+j]=new JButton(inputButtonNames[i][j]);
bp.add(inButton[i*4+j]);//Add input button to input button panel
inButton[i*4+j].addActionListener(this);//Give action monitor
}
}
this.add(bp, BorderLayout.SOUTH);//Set input button panel orientation: set South
JPanel cbp=new JPanel();//Create clear button and triangle function button panel
for(int i=0;i<resetButtonNames.length;i++){////Use array and loop to implant clear buttons one by one
resetButton[i]=new JButton(resetButtonNames[i]);
cbp.add(resetButton[i]);//Add clear button to clear button
resetButton[i].addActionListener(this);//Give action monitor
}
this.add(cbp, BorderLayout.CENTER);//Set clear button panel orientation: Center
this.setVisible(true);//Set form visible
try {
client=new Socket("localhost",8866);//Create local socket
} catch (IOException e4) {
e4.printStackTrace();
}
try {
out=client.getOutputStream();
dataout=new DataOutputStream(out);
in=client.getInputStream();
datain=new DataInputStream(in);
} catch (IOException ee) {
ee.printStackTrace();
}
}
public void run(){//Thread running
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == inButton[0]) {//Action monitoring of sin
com=true;
number=0;
symbol=1;
show.setText("sin");
}
else if(e.getSource() == inButton[1]) {//cos action monitoring
com=true;
number=0;
symbol=2;
show.setText("cos");
}
else if(e.getSource() == inButton[2]) {//tan's action monitoring
com=true;
number=0;
symbol=3;
show.setText("tan");
}
else if(e.getSource() == inButton[3]) {//Action monitoring of Kaifang
com=true;
number=0;
symbol=4;
show.setText("√");
}
else if (e.getSource() == inButton[4]) {//Action monitoring of digit 1
if(com==true||number==0){//First input
show.setText("1");//Output the first input number
number=1;
com=false;
}
else{ //Non first input
tempText=show.getText();//Get the first entered number
show.setText(tempText+"1");//Output the number of n inputs together
}
}
else if (e.getSource() == inButton[5]) {//Digital 2 action monitoring
if(com||number==0){
show.setText("2");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"2");
}
}
else if (e.getSource() == inButton[6]) {//Action monitoring of digit 3
if(com||number==0){
show.setText("3");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"3");
}
}
else if (e.getSource() == inButton[7]) { //Plus action monitoring
com=true;
number=0;
symbol=5;
num_one=Float.parseFloat(show.getText());//Convert the acquired string to a number
show.setText("+");
}
else if (e.getSource() == inButton[8]) {//Action monitoring of digit 4
if(com||number==0){
show.setText("4");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"4");
}
}
else if (e.getSource() == inButton[9]) {//Action monitoring of digit 5
if(com||number==0){
show.setText("5");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"5");
}
}
else if (e.getSource() == inButton[10]) {//Action monitoring of digit 6
if(com||number==0){
show.setText("6");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"6");
}
}
else if (e.getSource() == inButton[11]) {//Action monitoring of minus sign
com=true;
number=0;
symbol=6;
num_one=Float.parseFloat(show.getText());//Convert the acquired string to a number
show.setText("-");
}
else if (e.getSource() == inButton[12]) {//Action monitoring of digit 7
if(com||number==0){
show.setText("7");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"7");
}
}
else if (e.getSource() == inButton[13]) {//Action monitoring of digit 8
if(com||number==0){
show.setText("8");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"8");
}
}
else if (e.getSource() == inButton[14]) {//Action monitoring of digit 9
if(com||number==0){
show.setText("9");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"9");
}
}
else if (e.getSource() == inButton[15]) {//Multiple sign action monitoring
com=true;
number=0;
symbol=7;
num_one=Float.parseFloat(show.getText());//Convert the acquired string to a number
show.setText("*");
}
else if (e.getSource() == inButton[16]) {
if(com||number==0){//To be improved: make it impossible to press this button for the first time
show.setText(".");
number=1;
com=false;
}
else{//Determine whether the obtained string contains decimal point "."
tempText=show.getText();
if(tempText.indexOf(".")==-1){
show.setText(tempText+".");
}
else{show.setText(tempText);}
}
}
else if (e.getSource() == inButton[17]) {//Action monitoring of digit 0
if(com||number==0){
show.setText("0");
number=1;
com=false;
}
else{
tempText=show.getText();
show.setText(tempText+"0");
}
}
else if (e.getSource() == inButton[18]) {//Equal sign action monitoring
num_two=Float.parseFloat(show.getText());//Get the string after the input operation symbol and convert it
switch(symbol){
case 1:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(""+result);
} catch (IOException e2) {
e2.printStackTrace();
}break;
case 2:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(""+result);
} catch (IOException e2) {
e2.printStackTrace();
}break;
case 3:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(""+result);
} catch (IOException e2) {
e2.printStackTrace();
}break;
case 4:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(""+result);
} catch (IOException e2) {
e2.printStackTrace();
}break;
case 5:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_one);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(""+result);
} catch (IOException e1) {
e1.printStackTrace();
}break;
case 6:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_one);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(result+"");
} catch (IOException e1) {
e1.printStackTrace();
}break;
case 7:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_one);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(result+"");
} catch (IOException e1) {
e1.printStackTrace();
}break;
case 8:try {
dataout.writeInt(symbol);
dataout.writeFloat(num_one);
dataout.writeFloat(num_two);
result=datain.readFloat();
number=0;//Ibid.
show.setText(result+"");
} catch (IOException e1) {
e1.printStackTrace();
}break;
default:number=0;break;//Ibid.
}
}
else if(e.getSource() == inButton[19]) {//Action monitoring of division sign
com=true;
number=0;
symbol=8;
num_one=Float.parseFloat(show.getText());//Convert the acquired string to a number
show.setText("/");
}
else if (e.getSource() == resetButton[0]){//Clear button AC
number=0;//The effect is the same as the interpretation of the equal sign "number=0"
symbol=0;//Reset symbol
show.setText("0");
}
else if (e.getSource() == resetButton[1]){//Single byte clear button C
number=0;//The effect is the same as the interpretation of the equal sign "number=0"
symbol=0;//Reset symbol
tempText=show.getText();
if(tempText.equals("sin")||tempText.equals("cos")||tempText.equals("tan")||(tempText.length()-1)==0){//Determine whether tempText is a single byte
show.setText("0");
}
else {
show.setText(tempText.substring(0,tempText.length()-1));
if(tempText.length()==0)
{show.setText("0");}
}
}
}
}
Client main method:
package com.netproject2;
public class DemoClient {
public static void main(String[] args) {
CalculatorClient p = new CalculatorClient();
new Thread(p).start();
}
}