Java program to send text or image file from client to server(receiver). In this program, more than one client can send text or image file to server. Run client and server program using command prompt, Both side GUI will open for communication.
Sender Program
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
class Client implements ActionListener
{
Socket s;
DataInputStream din;
DataOutputStream dout;
String str;
//*******************************Client1 GUI*********************************//
TextField tf;
TextArea ta;
Label lb;
Button b;
public Client()
{
Frame f=new Frame("Client");
f.setLayout(new FlowLayout());
f.setBackground(Color.orange);
tf=new TextField(15);
ta=new TextArea(12,20);
ta.setBackground(Color.white);
lb=new Label("Enter File Name To Be Send");
b=new Button("Send");
f.add(lb);
f.add(tf);
f.add(b);
f.add(ta);
ta.setBounds(200,200,10,10);
f.addWindowListener(new W1());
b.addActionListener(this);
f.setSize(300,400);
f.setLocation(300,300);
f.setVisible(true);
f.validate();
//*********************************GUI END*******************************//
//********************************Creating Connection*********************//
try {
s=new Socket("localhost",7860);
System.out.println(s);
din=new DataInputStream(s.getInputStream());
dout=new DataOutputStream(s.getOutputStream());
}catch(Exception e)
{
System.out.println(e);
}
}
private class W1 extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
}
//********************************************************************//
public void actionPerformed(ActionEvent ae)
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String fileName;
if(ae.getSource()==b)
{
fileName=tf.getText();
//*******************Coading for image transfer**********************//
int flag=0,i;
String extn="";
for(i=0;i<fileName.length();i++)
{
if(fileName.charAt(i)=='.' || flag==1)
{
flag=1;
extn+=fileName.charAt(i);
}
}
if(extn.equals(".jpg") || extn.equals(".png"))
{
try{
File file = new File(fileName);
FileInputStream fin = new FileInputStream(file);
dout.writeUTF(fileName);
System.out.println("Sending image...");
byte[] readData = new byte[1024];
while((i = fin.read(readData)) != -1)
{
dout.write(readData, 0, i);
}
System.out.println("Image sent");
ta.appendText("\nImage Has Been Sent");
fin.close();
}catch(IOException ex)
{System.out.println("Image ::"+ex);}
//*****************************Text File********************************//
}
else
{
try{
FileInputStream fstream = new FileInputStream(fileName);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader bcr = new BufferedReader(new InputStreamReader(in));
dout.writeUTF(fileName);
System.out.println("Sending File" + fileName);
String s1;
ta.appendText("\n");
while((s1=bcr.readLine())!=null)
{
System.out.println(""+s1);
ta.appendText(s1+"\n");
dout.writeUTF(s1);
dout.flush();
Thread.currentThread().sleep(500);
}
}catch(Exception e){System.out.println("Enter Valid File Name");}
}
}
}
public static void main(String ar[])
{
Client object=new Client();
}
}
Receiver program
import java.io.*;
import java.net.*;
class Server
{
static int i=0;
private static int maxcon=0;
public static void main(String args[])
{
try
{
ServerSocket ss;
Socket s;
System.out.println("Server Started");
ss=new ServerSocket(7860);
while((i++ < maxcon) || (maxcon == 0))
{
doComms connection;
s=ss.accept();
System.out.println(s);
System.out.println("Client "+i+" Connected");
doComms conn_c= new doComms(s);
Thread t = new Thread(conn_c);
t.start();
}
} catch (IOException ioe) {
System.out.println("IOException on socket listen: " + ioe);
ioe.printStackTrace();
}
}
}
class doComms implements Runnable
{
private Socket s;
doComms(Socket s)
{
this.s=s;
}
public void run ()
{
try {
// Get input from the client
DataInputStream dis = new DataInputStream (s.getInputStream());
PrintStream out1 = new PrintStream(s.getOutputStream());
String str,extn="";
str=dis.readUTF();
System.out.println("\n"+str);
int flag=0,i;
for(i=0;i<str.length();i++)
{
if(str.charAt(i)=='.' || flag==1)
{
flag=1;
extn+=str.charAt(i);
}
}
//**********************reading image*********************************//
if(extn.equals(".jpg") || extn.equals(".png"))
{
File file = new File("RecievedImage"+str);
FileOutputStream fout = new FileOutputStream(file);
//receive and save image from client
byte[] readData = new byte[1024];
while((i = dis.read(readData)) != -1)
{
fout.write(readData, 0, i);
if(flag==1)
{
System.out.println("Image Has Been Received");
flag=0;
}
}
fout.flush();
fout.close();
//****************************Reading Other Files******************//
}
else
{
FileWriter fstream = new FileWriter("ReceivedFile"+ str);
PrintWriter out=new PrintWriter(fstream);
do
{
str=dis.readUTF();
System.out.println(" "+str);
out.println(str);
out.flush();
if(str==null)break;
}while(true);
System.out.println("One File Received");
out.close();
}
} catch (IOException ioe) {
System.out.println("");
}
}
}
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