Create a Proxy Server in Java

Create a Proxy Server in Java

Create a Proxy Server in Java : Multi-thousand tips to make your life easier.

A Java proxy server acts as an intermediary between a client computer or processor and a server. Although it is invisible, it performs the important function of sending requests from the client to the server and returning responses from the server to the client. If you want to create a proxy server using Java, here is how you can do it:

• Install the application. If your computer does not have the latest Java Development Kit from Sun Microsystems, download and install it.
• Open the text editor of your choice. This can also be your preferred integrated development environment. Keep in mind that for the Java proxy server to achieve cross-compatibility, it must implement an interface. Accordingly, import the net and java.io libraries and define the proxy server. The implementation should appear as follows:

                import java.io.*;
                import java.net.*;
                interface mySockets
                {
                String readLine();
                void writeLine(String myString);
                void dispose();
                }

• Check the validity of different parameters. When the server is initiated, the validity of different parameters will be displayed. The parameters include the local port, the name of the remote host, the remote port address, and the like. If there are invalid parameters, an error will be reported.
• Implement SocketInterface. This is necessary so that the Proxy class can be defined. It includes the host port address, the port, and the command to wait or not for a connection. The text editor command should appear like the following:

                public class SocketProxy implements mySockets
                {
                private Socket mySocket;
                private BufferedReader myIn;
                private PrintWriter myOut;
                public SocketProxy( String myHost, int myPort, boolean myWait )
                {

• Wait for the establishment of a new connection. When the connection is activated, an input stream of BufferedReader will be opened. This will then be passed to the PrintWriter class's output stream. This is the one to be used by the server to forward any kind of information. Take the commands below as a guide:

                {
                if (myWait) {
                ServerSocket myServer = new ServerSocket( myPort );
                mySocket = myServer.accept();
                }
                else
                mySocket = new Socket( myHost, myPort );
                myIn = new BufferedReader( new InputStreamReader(
                mySocket.getInputStream()));
                myOut = new PrintWriter( mySocket.getOutputStream(), true );
                } catch( IOException e ) { e.printStackTrace(); }
                }       

• Read the server's input stream. Using the readLine method, read the input and then return to the writeLine method. This must read as follows:

                public String readLine() {
                String myString = null;
                try { myString = myIn.readLine();
                } catch( IOException e ) { e.printStackTrace(); }
                return myString;
                }
                public void writeLine( String myString ) {
                myOut.println( myString );
                }

• Close the socket. After the server has finished passing information between the main server and the client computer, close or end the network socket. To do this, the following command must be used:

                public void dispose() {
                try {
                mySocket.close();
                } catch( IOException e ) { e.printStackTrace(); }
                } }

Once this process is finished, you have successfully created a proxy server using Java. Now, you can freely and successfully use the server. Even if you cannot see the success physically, the communication between the server and a computer is enough proof of the success of this task.