Java TCP protocol Socket Programming learning

The following is a one-to-two communication programming implementation, and will continue to learn a server to listen to the implementation of multiple clients.

The main steps I've learned

First step: Create a new socket object with a specific port (e.g. 4800)
Step two: Construct the BufferedReader object with the system input device, which is used to receive the characters of the system keyboard input
Step three: Construct the PrintWriter by getting the output stream from the socket object
Fourth step: Get the input stream from the socket object to construct the corresponding BufferedReader object, which is used to receive the information sent by the server side .

I understand the closure of the socket: the first open after closing, the socket is finally closed.

The following is the code implementation of the client:

Package com.fan.socket;

Import java.io.*;
Import Java.net.Socket;

public class Socketclient {
public static void Main (string[] args) throws ioexception{

try{
Socket socket=new Socket ("127.0.0.1", 4800);
System.out.println ("Client start ...");
//Shanben 4800 port to make customer request
BufferedReader br=new BufferedReader (New InputStreamReader (system.in));
//BufferedReader object constructed by system standard input device
printwriter write=new PrintWriter (Socket.getoutputstream ());
//The output stream is obtained by the socket object, and the PrintWriter object is constructed
BufferedReader in=new BufferedReader (New InputStreamReader (Socket.getinputstream ()));
//The input stream is obtained by the socket object and the corresponding BufferedReader object is constructed
String ReadLine;
readline=br.readline ();//Read a string from the system standard input
While (!readline.equals ("End")) {
//Stop looping if the string read in from standard input is "end"
write.println (readline);
//Output A string read from the system standard input to Server2
Write.flush ();
//Refresh the output stream so that the server receives the string immediately
System.out.println ("Client:" +readline);
//Print the read-in string on the system standard output
System.out.println ("Server:" +in.readline ());
//Read a string from server and print to standard output
readline=br.readline ();//Read a string from the system standard input
}//Resume loop
write.close ();//close socket output stream
in.close ();//close socket input stream
socket.close ();//Close Socket
}catch (Exception e) {
System.out.println ("Can not listen to:" +e);//error, print error message
}
}

}

Server-side code implementation:

Package com.fan.socket;

Import java.io.*;
Import Java.net.ServerSocket;
Import Java.net.Socket;

Public class Socketservice {
Public static void Main (string[] args) throws ioexception{
Socketservice socketservice = new Socketservice ();
socketservice.oneserver ();
}

Public void Oneserver () {
try{
ServerSocket server=null;
try{
server=new ServerSocket (4800);
System.out.println ("Server Start is ok ...");
//Create a serversocket on port 4800 to listen for customer requests
}catch (Exception e) {
System.out.println ("Can not listen to:" +e);
//error, print error message
}
Socket socket=null;
try{
socket=server.accept ();
//Use the Accept () block to wait for customer requests, with customer
//Request arrives to generate a socket object and continue execution
}catch (Exception e) {
System.out.println ("Error.") +E);
//error, print error message
}
String Line;
BufferedReader in=new BufferedReader (New InputStreamReader (Socket.getinputstream ()));
//The input stream is obtained by the socket object and the corresponding BufferedReader object is constructed
printwriter writer=new PrintWriter (Socket.getoutputstream ());
//The output stream is obtained by the socket object, and the PrintWriter object is constructed
BufferedReader br=new BufferedReader (New InputStreamReader (system.in));
//BufferedReader object constructed by system standard input device
System.out.println ("Client:" +in.readline ());
//Print a string read from the client on standard output
line=br.readline ();
//Read into a string from standard input
While (!line.equals ("End")) {
//If the string is "Bye", the loop is stopped
writer.println (line);
//Output The string to the client
Writer.flush ();
//Refresh the output stream so that the client receives the string immediately
System.out.println ("Server:" +line);
//Print the read-in string on the system standard output
System.out.println ("Client:" +in.readline ());
//Read a string from the client and print to the standard output
line=br.readline ();
//Read into a string from the system standard input
}//Resume loop
writer.close ();//close socket output stream
in.close ();//close socket input stream
socket.close ();//Close Socket
server.close ();//Close ServerSocket
}catch (Exception e) {//error, printing error message
System.out.println ("Error.") +E);
}
}
}

Java TCP protocol Socket Programming learning